HP P2000 G3 Reference Manual
HP StorageWorks
P2000 G3 MSA System
SMU Reference Guide
Par t number: 500911- 0 0 5
First edition: September 2010
Legal and notice information
© Copyright 2010 Hewlett-Packard Development Company, L.P.
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Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed to the U.S. Government under
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The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express
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not be liable for technical or editorial errors or omissions contained herein.
Acknowledgements
Microsoft and Windows are U.S. registered trademarks of Microsoft Corporation.
UNIX is a registered trademark of The Open Group.
Contents
About this guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Intended audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Prerequisites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Related documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Document conventions and symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
HP technical support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Product warranties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Subscription service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
HP web sites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Documentation feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Configuring and provisioning a new storage system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Browser setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Signing in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Tips for signing in and signing out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Tips for using the main window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Tips for using the help window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
System concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
About user accounts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Related topics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
About vdisks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Related topics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
About spares. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Related topics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
About volumes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Related topics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
About hosts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Related topics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
About volume mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
About volume cache options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Using write-back or write-through caching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Optimizing read-ahead caching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Related topics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
About managing remote systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Related topics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
About the Snapshot feature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Related topics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
About the Volume Copy feature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Related topics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
About the VDS and VSS hardware providers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
About RAID levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
About size representations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Related topics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
About the system date and time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Related topics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
About storage-space color codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
About Configuration View icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
About vdisk reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
About data protection in a single-controller storage system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
HP StorageWorks P2000 G3 MSA System SMU Reference Guide 3
2 Configuring the system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Using the Configuration Wizard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Step 1: Starting the wizard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Step 2: Changing default passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Step 3: Configuring network ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Step 4: Enabling system-management services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Step 5: Setting system information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Step 6: Configuring event notification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Step 7: Configuring host ports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Step 8: Confirming configuration changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Installing a license . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Configuring system services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Changing management interface settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Configuring email notification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Configuring SNMP notification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Configuring user accounts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Adding users. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Modifying users. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Removing users . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Configuring system settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Changing the system date and time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Changing host interface settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Changing network interface settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Setting system information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Configuring advanced settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Changing disk settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Configuring SMART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Configuring drive spin down for available disks and global spares. . . . . . . . . . . . . . . . . . . . . . . . 49
Scheduling drive spin down for all disks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Configuring dynamic spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Configuring the EMP polling rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Changing system cache settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Changing the synchronize-cache mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Changing the missing LUN response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Controlling host access to the system's write-back cache setting . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Changing auto-write-through cache triggers and behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Configuring partner firmware update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Configuring system utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Configuring background scrub for vdisks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Configuring background scrub for disks not in vdisks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Configuring utility priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Configuring remote systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Adding a remote system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Removing a remote system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Configuring a vdisk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Managing dedicated spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Changing a vdisk's name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Changing a vdisk's owner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Configuring drive spin down for a vdisk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Configuring a volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Changing a volume's name or OpenVMS UID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Changing a volume's cache settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Configuring a snapshot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Changing a snapshot’s name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Configuring a snap pool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Changing a snap pool’s name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4Contents
3 Provisioning the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Using the Provisioning Wizard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Step 1: Starting the wizard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Step 2: Specifying the vdisk name and RAID level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Step 3: Selecting disks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Step 4: Defining volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Step 5: Setting the default mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Step 6: Confirming vdisk settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Creating a vdisk. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Deleting vdisks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Managing global spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Creating a volume set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Creating a volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Deleting volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Changing default mapping for multiple volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Explicitly mapping multiple volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Changing a volume's default mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Changing a volume's explicit mappings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Unmapping volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Expanding a volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Creating multiple snapshots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Creating a snapshot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Deleting snapshots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Resetting a snapshot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Creating a volume copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Aborting a volume copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Rolling back a volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Creating a snap pool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Deleting snap pools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Adding a host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Removing hosts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Changing a host's name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Changing host mappings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Configuring CHAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Modifying a schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Deleting schedules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
4 Using system tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Updating firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Updating controller module firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Updating expansion module firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Updating disk firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Saving logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Resetting a host port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Rescanning disk channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Restoring system defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Clearing disk metadata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Restarting or shutting down controllers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Restarting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Shutting down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Testing event notification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Expanding a vdisk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Verifying a vdisk. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Scrubbing a vdisk. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Removing a vdisk from quarantine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Expanding a snap pool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Checking links to a remote system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
HP StorageWorks P2000 G3 MSA System SMU Reference Guide 5
5 Viewing system status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Viewing information about the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
System properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Enclosure properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Disk properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Vdisk properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Volume properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Snap-pool properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Snapshot properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Schedule properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Configuration limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Licensed features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Version properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Viewing the system event log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Viewing information about all vdisks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Viewing information about a vdisk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Vdisk properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Disk properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Volume properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Snap-pool properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Viewing information about a volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Volume properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Mapping properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Schedule properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Viewing information about a snapshot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Snapshot properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Mapping properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Schedule properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Viewing information about a snap pool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Snap-pool properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Volume properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Snapshot properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Viewing information about all hosts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Viewing information about a host. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Host properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Mapping properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Viewing information about an enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Enclosure properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Disk properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Power supply properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Fan properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Controller module properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Controller module: network port properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Controller module: host port properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Controller module: expansion port properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Controller module: CompactFlash properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Drive enclosure: I/O module properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
I/O module: In port properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
I/O module: Out port properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Viewing information about a remote system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
6 Using Remote Snap to replicate volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
About the Remote Snap replication feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Replication actions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Performing initial replication locally or remotely. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Remote replication disaster recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Remote replication licensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Related topics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
6Contents
Using the Replication Setup Wizard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Step 1: Starting the wizard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Step 2: Selecting the primary volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Step 3: Selecting the replication mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Step 4: Selecting the secondary volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Step 5: Confirming replication settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Replicating a volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Replicating a snapshot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Removing replication from a volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Suspending replication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Resuming replication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Aborting replication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Detaching a secondary volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Stopping a vdisk. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Starting a vdisk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Reattaching a secondary volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Exporting a replication image to a snapshot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Changing the primary volume for a replication set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Viewing replication properties, addresses, and images for a volume. . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Replication properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Replication addresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Replication images. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Viewing information about a subordinate replication volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Replication properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Replication addresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Replication image properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Viewing information about a replication image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Replication status properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Primary volume snapshot properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Secondary volume snapshot properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
A SNMP reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Standard MIB-II behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Enterprise traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
FA MIB 2.2 SNMP behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
External details for certain FA MIB 2.2 objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
External details for connUnitRevsTable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
External details for connUnitSensorTable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
External details for connUnitPortTable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Configuring SNMP event notification in SMU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
SNMP management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Enterprise trap MIB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
FA MIB 2.2 and 4.0 differences. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
B Using FTP to download logs and update firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Downloading system logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Updating controller module firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Updating expansion module firmware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Updating disk firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Installing a license file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
HP StorageWorks P2000 G3 MSA System SMU Reference Guide 7
8Contents
Figures
1 Relationship between a master volume and its snapshots and snap pool. . . . . . . . . . . . . . . . . . . . . . 27
2 Rolling back a master volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3 Creating a volume copy from a master volume or a snapshot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4 Intersite and intrasite replication sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
5 Actions that occur during a series of replications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
6 Example of primary-volume failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
HP StorageWorks P2000 G3 MSA System SMU Reference Guide 9
10 Figures
Tables
1 Document conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2 SMU communication status icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3 Settings for default users . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4 Example applications and RAID levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5 RAID level comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6 Vdisk expansion by RAID level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7 Size representations in base 2 and base 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
8 Decimal (radix) point character by locale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
9 Storage-space color codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10 Configuration View icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
11 FA MIB 2.2 objects, descriptions, and values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
12 connUnitRevsTable index and description values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
13 connUnitSensorTable index, name, type, and characteristic values. . . . . . . . . . . . . . . . . . . . . . . . . . 128
14 connUnitPortTable index and name values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
HP StorageWorks P2000 G3 MSA System SMU Reference Guide 11
12 Tables
About this guide
This guide provides information about managing an HP StorageWorks P2000 G3 MSA System by using its
web interface, Storage Management Utility (SMU).
Intended audience
This guide is intended for storage system administrators.
Prerequisites
Prerequisites for using this product include knowledge of:
• Network administration
• Storage system configuration
• Storage area network (SAN) management and direct attach storage (DAS)
• Fibre Channel, Serial Attached SCSI (SAS), Internet SCSI (iSCSI), and Ethernet protocols
Related documentation
In addition to this guide, please refer to other documents for this product:
• HP StorageWorks P2000 G3 MSA System Racking Instructions
• HP StorageWorks P2000 G3 MSA System Installation Instructions
• HP StorageWorks P2000 G3 MSA System Cable Configuration Guide
• HP StorageWorks P2000 G3 MSA System FC User’s Guide
• HP StorageWorks P2000 G3 MSA System FC/iSCSI User’s Guide
• HP StorageWorks P2000 G3 MSA System SAS User’s Guide
• HP StorageWorks P2000 G3 MSA System iSCSI User’s Guide
• HP StorageWorks P2000 G3 MSA System CLI Reference Guide
• HP StorageWorks P2000 G3 MSA System Event Descriptions Reference Guide
• Online help for HP StorageWorks P2000 G3 MSA System management interfaces
You can find these documents from the Manuals page of the HP Business Support Center web site:
http://www.hp.com/support
/manuals.
HP StorageWorks P2000 G3 MSA System SMU Reference Guide 13
Document conventions and symbols
Table 1 Document conventions
Convention Element
Medium blue text: Figure 1 Cross-reference links and e-mail addresses
Medium blue, underlined text
(http://www.hp.com
Bold font • Key names
Italics font Text emphasis
Monospace font • File and directory names
Monospace, italic font • Code variables
Monospace, bold font Emphasis of file and directory names, system output, code, and text
)
Web site addresses
• Text typed into a GUI element, such as into a box
• GUI elements that are clicked or selected, such as menu and list
items, buttons, and check boxes
• System output
• Code
• Text typed at the command-line
• Command-line variables
typed at the command line
CAUTION: Indicates that failure to follow directions could result in damage to equipment or data.
IMPORTANT: Provides clarifying information or specific instructions.
NOTE: Provides additional information.
TIP: Provides helpful hints and shortcuts.
HP technical support
Telephone numbers for worldwide technical support are listed on the HP support web site:
http://www.hp.com/support/
Collect the following information before calling:
• Technical support registration number (if applicable)
• Product serial numbers
• Product model names and numbers
• Applicable error messages
• Operating system type and revision level
• Detailed, specific questions
For continuous quality improvement, calls may be recorded or monitored.
.
14 About this guide
Product warranties
For information about HP StorageWorks product warranties, see the warranty information website:
h
ttp://www.hp.com/go/storagewarranty
Subscription service
HP strongly recommends that customers sign up online using the Subscriber's choice web site:
http://www.hp.com/go/e-updates
• Subscribing to this service provides you with e-mail updates on the latest product enhancements, newest
versions of drivers, and firmware documentation updates as well as instant access to numerous other
product resources.
• After signing up, you can quickly locate your products by selecting Business support and then Storage
under Product Category.
HP web sites
For other product information, see the following HP web sites:
.
• http://www.hp.com
• http://www.hp.com/go/storage
• http://www.hp.com/support/manuals
• http://www.hp.com/support/downloads
• http://www.hp.com/storage/whitepapers
• h
ttp://www.hp.com/go/p2000
Documentation feedback
HP welcomes your feedback.
To make comments and suggestions about product documentation, please send a message to
storagedocs.feedback@hp.com. All submissions become the property of HP.
HP StorageWorks P2000 G3 MSA System SMU Reference Guide 15
16 About this guide
1 Getting started
Storage Management Utility (SMU) is a web-based application for configuring, monitoring, and managing
the storage system.
Each controller module in the storage system contains a web server, which you access when you sign in to
SMU. In a dual-controller system, you can access all functions from either controller. If one controller
becomes unavailable, you can continue to manage the storage system from the partner controller.
SMU is also referred to as the web-browser interface (WBI).
NOTE: It is possible to upgrade an MSA2000 storage system by replacing its controllers with P2000 G3
controllers, which use the version of SMU described in this guide. For upgrade information go to
http://
StorageWorks MSA2000 G2 to the P2000 G3 MSA.”
Configuring and provisioning a new storage system
To configure and provision a storage system for the first time:
1. Configure your web browser for SMU and sign in, as described in Browser setup and Signing in below.
2. Set the system date and time, as described in Changing the system date and time on page 46.
3. Use the Configuration Wizard to configure other system settings, as described in Using the
4. Use the Provisioning Wizard to create a virtual disk (vdisk) containing storage volumes, and optionally
5. Use the Replication Setup Wizard to configure replication for a primary volume to a remote system, as
6. If you mapped volumes to hosts, verify the mappings by mounting the volumes from each host and
7. Verify that controller modules and expansion modules have the latest firmware, as described in Viewing
www.hp.com/go/p2000 click Resource Library, and view the white paper “Upgrading the HP
Configuration Wizard on page 37.
to map the volumes to hosts, as described in Using the Provisioning Wizard on page 59.
described in Using the Replication Setup Wizard on page 110.
performing simple read/write tests to the volumes.
information about the system on page 89 and Updating firmware on page 79.
You can then make additional configuration and provisioning changes and view system status, as
described in later chapters of this guide.
Browser setup
• Use Mozilla Firefox 3 or later, or Microsoft Internet Explorer 7 or later.
• To see the help window, you must enable pop-up windows.
• To optimize the display, use a color monitor and set its color quality to the highest setting.
• To navigate beyond the Sign In page (with a valid user account):
• Set the browser's local-intranet security option to medium or medium-low.
• Verify that the browser is set to allow cookies at least for the IP addresses of the storage-system
network ports.
HP StorageWorks P2000 G3 MSA System SMU Reference Guide 17
Signing in
To sign in:
1. In the web browser’s address field, type the IP address of a controller network port and press Enter. The
SMU Sign In page is displayed. If the Sign In page does not display, verify that you have entered the
correct IP address.
2. On the Sign In page, enter the name and password of a configured user. The default user name and
password are manage and !manage. If you are logging in to SMU for the first time, the Language
field displays user setting or English, either of which results in English.
Language preferences can be configured for the system and for individual users.
3. Click Sign In. If the system is available, the System Overview page is displayed; otherwise, a message
indicates that the system is unavailable.
Tips for signing in and signing out
• Do not include a leading zero in an IP address. For example, enter 10.1.4.6 not 10.1.4.06.
• Multiple users can be signed in to each controller simultaneously.
• For each active SMU session an identifier is stored in the browser. Depending on how your browser
treats this session identifier, you might be able to run multiple independent sessions simultaneously.
Each instance of Internet Explorer can run a separate SMU session; however, all instances of Firefox
share the same session.
• If you end a SMU session without clicking the Sign Out link near the top of the SMU window, the
session automatically ends when the user's automatic sign-out time expires. If this preference is set to
Never, the session ends after 9999 minutes.
Tips for using the main window
• The Configuration View panel displays logical and physical components of the storage system. To
perform a task, select the component to act on and then either:
• Right-click to display a context menu and select the task to perform. This is the method that help
topics describe.
• Click a task category in the main panel and select the task to perform.
• The System Status panel shows how many events of each severity have occurred in the system. To view
event details, click a severity icon. For more information see Viewing the system event log on page 90.
• Many tables can be sorted by a specific column. To do so, click the column heading to sort low to high;
click again to sort high to low.
• Do not use the browser's Back, Forward, Reload, or Refresh buttons. SMU has a single page whose
content changes as you perform tasks and automatically updates to show current data.
• An asterisk (*) identifies a required setting.
• The icon in the upper right corner of the main window shows the status of communication between
SMU, the Management Controller (MC), and the Storage Controller (SC), as described in the following
table.
18 Getting started
Table 2 SMU communication status icons
Icon Meaning
SMU can communicate with the Management Controller,
which can communicate with the Storage Controller.
SMU cannot communicate with the Management Controller.
SMU can communicate with the Management Controller,
which cannot communicate with the Storage Controller.
• Below the communication status icon, a timer shows how long the session can be idle until you are
automatically signed out. This timer resets after each action you perform. One minute before automatic
sign-out you are prompted to continue using SMU. The timer does not appear if the current user's Auto
Sign Out preference is set to Never.
• If a SMU session is active on a controller and the controller is power cycled or is forced offline by the
partner controller or certain other events occur, the session might hang. SMU might say that it is
“Connecting” but stop responding, or the page may become blank with the browser status “Done.”
After the controller comes back online, the session will not restart. To continue using SMU, close and
reopen the browser and start a new SMU session.
• Colors that identify how storage space is used are described in About storage-space color codes on
page 33.
• Icons shown in the Configuration View panel are described in About Configuration View icons on
page 34.
Tips for using the help window
• To display help for a component in the Configuration View panel, right-click the component and select
Help. To display help for the content in the main panel, click either Help in the menu bar or the help
icon in the upper right corner of the panel.
• In the help window, click the table of contents icon to show or hide the Contents pane.
• A help topic remains displayed until you browse to another topic in the help window, display help for a
different item in the main window, or close the help window.
• If you have viewed more than one help topic, you can click the arrow icons to display the previous or
next topic.
HP StorageWorks P2000 G3 MSA System SMU Reference Guide 19
System concepts
About user accounts
The system provides three default user accounts and allows a maximum of 12 user accounts to be
configured. Any account can be modified or removed except you cannot remove the user you are signed in
as.
User accounts have these options:
• User Name. A user name is case sensitive and cannot already exist in the system. A name cannot
include a comma, double quote, or backslash.
• Password. A password is case sensitive. A password cannot include a comma, double quote, or
backslash. Though optional, passwords are highly recommended to ensure system security.
• User Roles. Select Monitor to let the user view system settings, or Manage to let the user view and
change system settings. You cannot change the role of user manage.
• User Type. Select Standard to allow access to standard functions, or Advanced to allow access to all
functions except diagnostic functions, or Diagnostic to allow access to all functions.
NOTE: This release has no functions that require Advanced or Diagnostic access; a Standard user can
access all functions.
• WBI Access. Allows access to the web-based management interface.
• CLI Access. Allows access to the command-line management interface.
• FTP Access. Allows access to the file transfer protocol interface, which provides a way to install
firmware updates and download logs.
• Base Preference. The base for entry and display of storage-space sizes. In base 2, sizes are shown as
powers of 2, using 1024 as a divisor for each magnitude. In base 10, sizes are shown as powers of 10,
using 1000 as a divisor for each magnitude. Operating systems usually show volume size in base 2.
Disk drives usually show size in base 10. Memory (RAM and ROM) size is always shown in base 2.
• Precision Preference. The number of decimal places (1–10) for display of storage-space sizes.
• Unit Preference. Sets the unit for display of storage-space sizes. The Auto option lets the system
determine the proper unit for a size. Based on the precision setting, if the selected unit is too large to
meaningfully display a size, the system uses a smaller unit for that size. For example, if the unit is set to
TB and the precision is set to 1, the size 0.11709 TB is s h o wn a s 119. 9 G B.
• Temperature Preference. Specifies to use either the Celsius scale or the Fahrenheit scale for temperature
values.
• Auto Sign Out. Select the amount of time that the user's session can be idle before the user is
automatically signed out: 5, 15, or 30 minutes, or Never (9999 minutes). The default is 30 minutes.
• Locale. The user’s preferred display language, which overrides the system’s default display language.
Installed language sets include Chinese-simplified, Chinese-traditional, Dutch, English, French,
German, Italian, Japanese, Korean, and Spanish.
Table 3 Settings for default users
Name Password Roles Type WBI CLI FTP Base Prec. Units Temp. Auto
monitor !monitor Monitor Standard Yes Yes No 10 1 Auto
manage !manage Monitor,
Manage
ftp !ftp Monitor,
Manage
20 Getting started
Yes Yes Yes
No No Yes
Celsius
Sign
Out
30
Min.
Locale
English
NOTE: To secure the storage system, set a new password for each default user.
Related topics
• Configuring user accounts on page 44
About vdisks
A vdisk is a “virtual” disk that is composed of one or more disks, and has the combined capacity of those
disks. The number of disks that a vdisk can contain is determined by its RAID level. All disks in a vdisk must
be the same type (SAS or SATA, small or large form-factor). A maximum of 16 vdisks per controller can
exist.
A vdisk can contain different models of disks, and disks with different capacities. For example, a vdisk can
include a 500-GB disk and a 750-GB disk. If you mix disks with different capacities, the smallest disk
determines the logical capacity of all other disks in the vdisk, regardless of RAID level. For example, if a
RAID-0 vdisk contains one 500-GB disk and four 750-GB disks, the capacity of the vdisk is equivalent to
approximately five 500-GB disks.
Each disk has metadata that identifies whether the disk is a member of a vdisk, and identifies other
members of that vdisk. This enables disks to be moved to different slots in a system; an entire vdisk to be
moved to a different system; and a vdisk to be quarantined if disks are detected missing.
In a single-controller system, all vdisks are owned by that controller. In a dual-controller system, when a
vdisk is created the system automatically assigns the owner to balance the number of vdisks each controller
owns; or, you can select the owner. Typically it does not matter which controller owns a vdisk.
In a dual-controller system, when a controller fails, the partner controller assumes temporary ownership of
the failed controller's vdisks and resources. If a fault-tolerant cabling configuration is used to connect the
controllers to drive enclosures and hosts, both controllers' LUNs are accessible through the partner.
When you create a vdisk you can use the default chunk size or one that better suits your application. The
chunk size is the amount of contiguous data that is written to a disk before moving to the next disk. After a
vdisk is created its chunk size cannot be changed. For example, if the host is writing data in 16-KB
transfers, that size would be a good choice for random transfers because one host read would generate
the read of exactly one disk in the volume. That means if the requests are random-like, then the requests
would be spread evenly over all of the disks, which is good for performance. If you have 16-KB accesses
from the host and a 64-KB block size, then some of the hosts accesses would hit the same disk; each chunk
contains four possible 16-KB groups of data that the host might want to read, which is not an optimal
solution. Alternatively, if the host accesses were 128 KB, then each host read would have to access two
disks in the vdisk. For random patterns, that ties up twice as many disks.
When you create a vdisk you can also create volumes within it. A volume is a logical subdivision of a
vdisk, and can be mapped to controller host ports for access by hosts. The storage system presents only
volumes, not vdisks, to hosts.
You can create vdisks with or without volumes by using the Provisioning Wizard, or you can create vdisks
manually.
Best practices for creating vdisks include:
• To maximize capacity, use disks of similar size.
• For greatest reliability, use disks of the same size and rotational speed.
• For storage configurations using many disks, create a few vdisks each containing many disks instead of
many vdisks each containing a few disks.
• To maximize capacity and disk usage (but not performance), you can create vdisks larger than 2 TB
and divide them into multiple volumes each having a capacity of 2 TB or less. This increases the usable
capacity of storage configurations by reducing the total number of parity disks required when using
parity-protected RAID levels. This differs from using a volume larger than 2 TB, which requires specific
support by the host operating system, I/O adapter, and application.
HP StorageWorks P2000 G3 MSA System SMU Reference Guide 21
• For maximum use of a dual-controller system’s resources, each controller should own a similar number
of vdisks.
• Set the chunk size to match the transfer block size of the host application.
Related topics
• About RAID levels on page 30
• About spares on page 22
• About volumes on page 23
• Vdisk topics in Provisioning the system on page 59
• Configuring a vdisk on page 55
• Verifying a vdisk on page 85
• Scrubbing a vdisk on page 85
• Viewing information about a vdisk (page 92), all vdisks (page 91), or the system (page 89)
• Removing a vdisk from quarantine on page 86
About spares
A controller automatically reconstructs a redundant (fault-tolerant) vdisk (RAID 1, 3, 5, 6, 10, 50) when one
or more of its disks fails and a compatible spare disk is available. A compatible disk has enough capacity
to replace the failed disk and is the same type (SAS or SATA).
There are three types of spares:
• Dedicated spare. Reserved for use by a specific vdisk to replace a failed disk. Most secure way to
provide spares for vdisks but expensive to reserve a spare for each vdisk.
• Global spare. Reserved for use by any redundant vdisk to replace a failed disk.
• Dynamic spare. An available compatible disk that is automatically assigned to replace a failed disk in
a redundant vdisk.
When a disk fails, the system looks for a dedicated spare first. If it does not find a dedicated spare, it looks
for a global spare. If it does not find a compatible global spare and the dynamic spares option is enabled,
it takes any available compatible disk. If no compatible disk is available, reconstruction cannot start.
A best practice is to designate spares for use if disks fail. Dedicating spares to vdisks is the most secure
method, but it is also expensive to reserve spares for each vdisk. Alternatively, you can enable dynamic
spares or assign global spares.
Related topics
• Configuring dynamic spares on page 50
• Managing dedicated spares on page 55
• Managing global spares on page 62
• Using the Provisioning Wizard on page 59
• Creating a vdisk on page 61
• Viewing information about a vdisk (page 92) or all vdisks (page 91)
22 Getting started
About volumes
A volume is a logical subdivision of a vdisk, and can be mapped to controller host ports for access by
hosts. A mapped volume provides the storage for a file system partition you create with your operating
system or third-party tools. The storage system presents only volumes, not vdisks, to hosts. A vdisk can have
a maximum of 128 volumes.
You can create a vdisk that has one volume or multiple volumes.
• Single-volume vdisks work well in environments that need one large, fault-tolerant storage space for
data on one host. A large database accessed by users on a single host that is used only for that
application is an example.
• Multiple-volume vdisks work well when you have very large disks and you want to make the most
efficient use of disk space for fault tolerance (parity and spares). For example, you could create one
10-TB RAID-5 vdisk and dedicate one spare to the vdisk. This minimizes the amount of disk space
allocated to parity and spares compared to the space required if you created five 2-TB RAID-5 vdisks.
However, I/O to multiple volumes in the same vdisk can slow system performance.
When you create volumes you can specify their sizes. If the total size of a vdisk's volumes equals the size
of the vdisk, you will not have any free space. Without free space, you cannot add or expand volumes. If
you need to add or expand a volume in a vdisk without free space, you can delete a volume to create free
space. Or, you can expand the vdisk and then either add a volume or expand a volume to use the new
free space.
You can use a volume's default name or change it to identify the volume's purpose. For example, a volume
used to store payroll information can be named Payroll.
You can create vdisks with volumes by using the Provisioning Wizard, or you can create volumes manually.
Related topics
• About vdisks on page 21
• About volume mapping on page 24
• About volume cache options on page 25
• Volume topics in Provisioning the system on page 59
• Changing a volume's name or OpenVMS UID on page 56
• Changing a volume's cache settings on page 57
• Viewing information about a volume on page 94
About hosts
A host identifies an external port that the storage system is attached to. The external port may be a port in
an I/O adapter (such as an FC HBA) in a server, or a port in a network switch.
The controllers automatically add hosts that have sent an
to the storage system. Hosts typically do this when they boot up or rescan for devices. When the command
from the host occurs, the system saves the host ID. The ID for an FC or SAS host is its WWPN. The ID for an
iSCSI host is typically, but not limited to, its IQN.
You must assign a name to an automatically added host to have the system retain it after a restart. Naming
hosts also makes them easy to recognize for volume mapping. A maximum of 64 names can be assigned.
The Configuration View panel lists hosts by name, or if they are unnamed, by ID.
inquiry
command or a
report luns
command
A storage system with iSCSI ports can be protected from unauthorized access via iSCSI by enabling
Challenge Handshake Authentication Protocol (CHAP). CHAP authentication occurs during an attempt by
a host to login to the system. This authentication requires an identifier for the host and a shared secret
between the host and the system. Optionally, the storage system can also be required to authenticate itself
to the host; this is called mutual CHAP. Steps involved in enabling CHAP include:
• Decide on host node names (identifiers) and secrets. The host node name is typically, but not limited to,
its IQN. A secret must have 12–16 characters.
• Define CHAP entries in the storage system. If the node name is a host name, then it may be useful to
display the hosts that are known to the system.
HP StorageWorks P2000 G3 MSA System SMU Reference Guide 23
• Enable CHAP on the storage system. Note that this applies to all iSCSI hosts, in order to avoid security
exposures.
• Define CHAP secret in the host iSCSI initiator.
• Request host login to the storage system. The host should be displayable by the system, as well as the
ports through which connections were made.
If it becomes necessary to add more hosts after CHAP is enabled, additional CHAP node names and
secrets can be added. If a host attempts to login to the storage system, it will become visible to the system,
even if the full login is not successful due to incompatible CHAP definitions. This information may be useful
in configuring CHAP entries for new hosts. This information becomes visible when an iSCSI discovery
session is established, because the storage system does not require discovery sessions to be authenticated.
Related topics
• Using the Configuration Wizard on page 37
• Changing host interface settings on page 46
• Adding a host on page 74
• Removing hosts on page 75
• Changing a host's name on page 75
• Changing host mappings on page 75
• Viewing information about a host (page 99) or all hosts (page 98)
About volume mapping
Each volume has default host-access settings that are set when the volume is created; these settings are
called the default mapping. The default mapping applies to any host that has not been explicitly mapped
using different settings. Explicit mappings for a volume override its default mapping.
Default mapping enables all attached hosts to see a volume using a specified LUN and access permissions
set by the administrator. This means that when the volume is first created, all connected hosts can
immediately access the volume using the advertised default mapping settings. This behavior is expected by
some operating systems, such as Microsoft Windows, which can immediately discover the volume. The
advantage of a default mapping is that all connected hosts can discover the volume with no additional
work by the administrator. The disadvantage is that all connected hosts can discover the volume with no
restrictions. Therefore, this process is not recommended for specialized volumes that require restricted
access.
You can change a volume's default mapping, and create, modify, or delete explicit mappings. A mapping
can specify read-write, read-only, or no access through one or more controller host ports to a volume.
When a mapping specifies no access, the volume is masked. You can apply access privileges to one or
more of the host ports on either controller. To maximize performance, map a volume to at least one host
port on the controller that owns it. To sustain I/O in the event of controller failure, map to at least one host
port on each controller.
For example, a payroll volume could be mapped with read-write access for the Human Resources host and
be masked for all other hosts. An engineering volume could be mapped with read-write access for the
Engineering host and read-only access for other departments’ hosts.
A LUN identifies a mapped volume to a host. Both controllers share a set of LUNs, and any unused LUN
can be assigned to a mapping; however, each LUN can only be used once per volume as its default LUN.
For example, if LUN 5 is the default for Volume1, no other volume in the storage system can use LUN 5 as
its default LUN. For explicit mappings, the rules differ: LUNs used in default mappings can be reused in
explicit mappings for other volumes and other hosts.
TIP: When an explicit mapping is deleted, the volume’s default mapping takes effect. Therefore, it is
recommended to use the same LUN for explicit mappings as for the default mapping.
24 Getting started
IMPORTANT: In an FC/iSCSI combo system, do not connect hosts or map volumes to host ports used for
replication. Attempting to do so could interfere with replication operation.
Volume mapping settings are stored in disk metadata. If enough of the disks used by a volume are moved
into a different enclosure, the volume's vdisk can be reconstructed and the mapping data is preserved.
About volume cache options
You can set options that optimize reads and writes performed for each volume.
Using write-back or write-through caching
CAUTION: Only disable write-back caching if you fully understand how the host operating system,
application, and adapter move data. If used incorrectly, you might hinder system performance.
You can change a volume's write-back cache setting. Write-back is a cache-writing strategy in which the
controller receives the data to be written to disks, stores it in the memory buffer, and immediately sends the
host operating system a signal that the write operation is complete, without waiting until the data is actually
written to the disk. Write-back cache mirrors all of the data from one controller module cache to the other.
Write-back cache improves the performance of write operations and the throughput of the controller.
When write-back cache is disabled, write-through becomes the cache-writing strategy. Using write-through
cache, the controller writes the data to the disks before signaling the host operating system that the process
is complete. Write-through cache has lower write operation and throughput performance than write-back,
but it is the safer strategy, with minimum risk of data loss on power failure. However, write-through cache
does not mirror the write data because the data is written to the disk before posting command completion
and mirroring is not required. You can set conditions that cause the controller to change from write-back
caching to write-through caching.
In both caching strategies, active-active failover of the controllers is enabled.
You can enable and disable the write-back cache for each volume. By default, volume write-back cache is
enabled. Because controller cache is backed by super-capacitor technology, if the system loses power,
data is not lost. For most applications, this is the correct setting. But because back-end bandwidth is used to
mirror cache and because this mirroring uses back-end bandwidth, if you are writing large chunks of
sequential data (as would be done in video editing, telemetry acquisition, or data logging), write-through
cache has much better performance. Therefore, you might want to experiment with disabling the write-back
cache. You might see large performance gains (as much as 70 percent) if you are writing data under the
following circumstances:
• Sequential writes
• Large I/Os in relation to the chunk size
• Deep queue depth
If you are doing random access to this volume, leave the write-back cache enabled.
The best practice for a fault-tolerant configuration is to use write-back caching.
Optimizing read-ahead caching
CAUTION: Only change read-ahead cache settings if you fully understand how the host operating
system, application, and adapter move data so that you can adjust the settings accordingly.
You can optimize a volume for sequential reads or streaming data by changing its read-ahead cache
settings. Read ahead is triggered by two back-to-back accesses to consecutive LBA ranges, whether
forward (increasing LBAs) or reverse (decreasing LBAs).
HP StorageWorks P2000 G3 MSA System SMU Reference Guide 25
You can change the amount of data read in advance after two back-to-back reads are made. Increasing
the read-ahead cache size can greatly improve performance for multiple sequential read streams; however,
increasing read-ahead size will likely decrease random read performance.
• The Default option works well for most applications: it sets one chunk for the first access in a sequential
read and one stripe for all subsequent accesses. The size of the chunk is based on the chunk size used
when you created the vdisk (the default is 64 KB). Non-RAID and RAID-1 vdisks are considered to have
a stripe size of 64 KB.
• Specific size options let you select an amount of data for all accesses.
• The Maximum option lets the controller dynamically calculate the maximum read-ahead cache size for
the volume. For example, if a single volume exists, this setting enables the controller to use nearly half
the memory for read-ahead cache.
Only use Maximum when disk latencies must be absorbed by cache. For example, for read-intensive
applications, you will want data that is most often read to be in cache so that the response to the read
request is very fast; otherwise, the controller has to locate which disks the data is on, move it up to
cache, and then send it to the host. Do not use Maximum if more than two volumes are owned by the
controller on which the read-ahead setting is being made. If there are more than two volumes, there is
contention on the cache as to which volume’s read data should be held and which has the priority;
each volume constantly overwrites the other volume’s data in cache, which could result in taking a lot of
the controller’s processing power.
• The Disabled option turns off read-ahead cache. This is useful if the host is triggering read ahead for
what are random accesses. This can happen if the host breaks up the random I/O into two smaller
reads, triggering read ahead.
You can also change the optimization mode.
• The standard read-ahead caching mode works well for typical applications where accesses are a
combination of sequential and random; this method is the default. For example, use this mode for
transaction-based and database update applications that write small files in random order.
• For an application that is strictly sequential and requires extremely low latency, you can use Super
Sequential mode. This mode makes more room for read-ahead data by allowing the controller to
discard cache contents that have been accessed by the host. For example, use this mode for video
playback and multimedia post-production video- and audio-editing applications that read and write
large files in sequential order.
Related topics
• Changing a volume's cache settings on page 57
• Changing system cache settings on page 51
• Viewing information about a volume on page 94
About managing remote systems
You can add a management object to obtain information from a remote storage system. This allows a local
system to track remote systems by their network-port IP addresses and cache their login credentials — the
user name and password for a manage-level user on that system. The IP address can then be used in
commands that need to interact with the remote system.
After a remote system has been added, you can check the connectivity of host ports in the local system to
host ports in that remote system. A port in the local system can only link to ports with the same host
interface, such as Fibre Channel (FC), in a remote system.
Communication between local and remote systems is an essential part of the remote replication feature.
Related topics
• Adding a remote system on page 54
• Removing a remote system on page 54
• Viewing information about a remote system on page 104
• Checking links to a remote system on page 87
• About the Remote Snap replication feature on page 105
26 Getting started
About the Snapshot feature
Snapshot is a licensed feature that provides data protection by enabling you to create and save snapshots
of a volume. Each snapshot preserves the source volume's data state at the point in time when the snapshot
was created. Snapshots can be created manually or by using the task scheduler.
When the first snapshot is taken of a standard volume, the system automatically converts the volume into a
master volume and reserves additional space for snapshot data. This reserved space, called a snap pool,
stores pointers to the source volume's data. Each master volume has its own snap pool. The system treats a
snapshot like any other volume; the snapshot can be mapped to hosts with read-only access, read-write
access, or no access, depending on the snapshot's purpose. Any additional unique data written to a
snapshot is also stored in the snap pool.
The following figure shows how the data state of a master volume is preserved in the snap pool by two
snapshots taken at different points in time. The dotted line used for the snapshot borders indicates that
snapshots are logical volumes, not physical volumes as are master volumes and snap pools.
MasterVolume-1 Snap Pool-1
Snapshot-1
(Monday)
Snapshot-2
(Tuesday)
Figure 1 Relationship between a master volume and its snapshots and snap pool
The snapshot feature uses the single copy-on-write method to capture only data that has changed. That is,
if a block is to be overwritten on the master volume, and a snapshot depends on the existing data in the
block being overwritten, the data is copied from the master volume to the snap pool before the data is
changed. All snapshots that depend on the older data are able to access it from the same location in the
snap pool; this reduces the impact of snapshots when writing to a master volume. In addition, only a single
copy-on-write operation is performed on the master volume.
The storage system allows a maximum number of snapshots to be retained, as determined by an installed
license. For example, if your license allows four snapshots, when the fifth snapshot is taken an error
message informs you that you have reached the maximum number of snapshots allowed on your system.
Before you can create a new snapshot you must either delete an existing snapshot, or purchase and install
a license that increases the maximum number of snapshots.
The snapshot service has two features for reverting data back to original data:
• Deleting only modified data on a snapshot. For snapshots that have been made accessible as
read-write, you can delete just the modified (write) data that was written directly to a snapshot. When
the modified data is deleted, the snapshot data reverts to the original data that was snapped. This
feature is useful for testing an application, for example. You might want to test some code, which writes
data to the snapshot. Rather than having to take another snapshot, you can just delete any write data
and start again.
• Rolling back the data in a source volume. The rollback feature enables you to revert the data in a
source volume to the data that existed when a specified snapshot was created (preserved data).
Alternatively, the rollback can include data that has been modified (write data) on the snapshot since
the snapshot was taken. For example, you might want to take a snapshot, mount that snapshot for
read/write, and then install new software on that snapshot for test purposes. If the software installation
is successful, you can rollback the master volume to the contents of the modified snapshot (preserved
data plus the write data).
HP StorageWorks P2000 G3 MSA System SMU Reference Guide 27
The following figure shows the difference between rolling back the master volume to the data that
existed when a specified snapshot was created (preserved), and rolling back preserved and modified
data.
MasterVolume-1
Snapshot-1
Preserved Data
(Monday)
Modified Data
(Tuesday)
When you use the rollback feature, you
can choose to exclude the modified data,
which will revert the data on the master
volume to the preserved data when
the snapshot was taken.
Snap Pool-1
MasterVolume-1
Figure 2 Rolling back a master volume
Snapshot operations are I/O-intensive. Every write to a unique location in a master volume after a
snapshot is taken will cause an internal read and write operation to occur in order to preserve the snapshot
data. If you intend to create snapshots of, create volume copies of, or replicate volumes in a vdisk, ensure
that the vdisk contains no more than four master volumes, snap pools, or both. For example: 2 master
volumes and 2 snap pools; 3 master volumes and 1 snap pool; 4 master volumes and 0 snap pools.
Related topics
• Installing a license on page 41
• Creating a snapshot (page 69) or multiple snapshots (page 68)
• Changing a snapshot’s default mapping (page 66) or explicit mappings (page 67)
• Deleting snapshots on page 69
• Resetting a snapshot on page 70
• Viewing information about a snapshot (page 96), a vdisk (page 92), all vdisks (page 91), or the
system (page 89)
• Rolling back a volume on page 73
• Deleting schedules on page 77
Snapshot-1
Preserved Data
(Monday)
Modified Data
(Tuesday)
Or you can choose to include the modified
data since the snapshot was taken, which
will revert the data on the master volume
to the current snapshot.
Snap Pool-1
28 Getting started
About the Volume Copy feature
Volume Copy enables you to copy a volume or a snapshot to a new standard volume.
While a snapshot is a point-in-time logical copy of a volume, the volume copy service creates a complete
“physical” copy of a volume within a storage system. It is an exact copy of a source volume as it existed at
the time the volume copy operation was initiated, consumes the same amount of space as the source
volume, and is independent from an I/O perspective. Volume independence is a key distinction of a
volume copy (versus a snapshot, which is a “virtual” copy and dependent on the source volume).
Benefits include:
• Additional data protection. An independent copy of a volume (versus logical copy through snapshot)
provides additional data protection against a complete master volume failure. If the source master
volume fails, the volume copy can be used to restore the volume to the point in time the volume copy
was taken.
• Non-disruptive use of production data. With an independent copy of the volume, resource contention
and the potential performance impact on production volumes is mitigated. Data blocks between the
source and the copied volumes are independent (versus shared with snapshot) so that I/O is to each
set of blocks respectively; application I/O transactions are not competing with each other when
accessing the same data blocks.
The following figure illustrates how volume copies are created.
Creating a volume copy from a standard or master volume
Source volume Transient snapshot Data transfer New volume
1. Volume copy request is made with a standard volume or a master volume as the source.
2. If the source a standard volume, it is converted to a master volume and a snap pool is created.
3. A new volume is created for the volume copy, and a hidden, transient snapshot is created.
4. Data is transferred from the transient snapshot to the new volume.
5. On completion, the transient volume is deleted and the new volume is a completely independent copy of
the master volume, representing the data that was present when the volume copy was started.
Creating a volume copy from a snapshot
Master volume
1. A master volume exists with one or more snapshots associated with it. Snapshots can be in their original
state or they can be modified.
2. You can select any snapshot to copy, and you can specify that the modified or unmodified data be copied.
3. On completion, the new volume is a completely independent copy of the snapshot. The snapshot remains,
though you can choose to delete it.
Snapshot(s) Data transfer New volume
Figure 3 Creating a volume copy from a master volume or a snapshot
HP StorageWorks P2000 G3 MSA System SMU Reference Guide 29
Snapshot operations are I/O-intensive. Every write to a unique location in a master volume after a
snapshot is taken will cause an internal read and write operation to occur in order to preserve the snapshot
data. If you intend to create snapshots of, create volume copies of, or replicate volumes in a vdisk, ensure
that the vdisk contains no more than four master volumes, snap pools, or both. For example: 2 master
volumes and 2 snap pools; 3 master volumes and 1 snap pool; 4 master volumes and 0 snap pools.
Guidelines to keep in mind when performing a volume copy include:
• The destination vdisk must be owned by the same controller as the source volume.
• The destination vdisk must have free space that is at least as large as the mount of space allocated to
the original volume. A new volume will be created using this free space for the volume copy.
• The destination vdisk does not need to have the same attributes (such as disk type, RAID level) as the
volume being copied.
• Once the copy is complete, the new volume will no longer have any ties to the original.
• Volume Copy makes a copy from a snapshot of the source volume; therefore, the snap pool for the
source volume must have sufficient space to store snapshot data when performing this copy.
Related topics
• Creating a volume copy on page 71
• Aborting a volume copy on page 72
• Viewing information about a volume on page 94
• Deleting schedules on page 77
About the VDS and VSS hardware providers
Virtual Disk Service (VDS) enables host-based applications to manage vdisks and volumes. Volume
Shadow Copy Service (VSS) enables host-based applications to manage snapshots. For more information,
see the VDS and VSS hardware provider documentation for your product.
About RAID levels
The RAID controllers enable you to set up and manage vdisks, whose storage may be spread across
multiple disks. This is accomplished through firmware resident in the RAID controller. RAID refers to vdisks
in which part of the storage capacity may be used to store redundant data. The redundant data enables
the system to reconstruct data if a disk in the vdisk fails.
Hosts see each partition of a vdisk, known as a volume, as a single disk. A volume is actually a portion of
the storage space on disks behind a RAID controller. The RAID controller firmware makes each volume
appear as one very large disk. Depending on the RAID level used for a vdisk, the disk presented to hosts
has advantages in fault-tolerance, cost, performance, or a combination of these.
NOTE: Choosing the right RAID level for your application improves performance.
The following tables:
• Provide examples of appropriate RAID levels for different applications
• Compare the features of different RAID levels
• Describe the expansion capability for different RAID levels
Table 4 Example applications and RAID levels
Application RAID level
Testing multiple operating systems or software development (where redundancy is not an issue) NRAID
Fast temporary storage or scratch disks for graphics, page layout, and image rendering 0
Workgroup servers 1 or 10
Video editing and production 3
30 Getting started
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