This document describes the integration of IP-based Storage Networks using the iSCSI protocol to HP
StorageWorks Fibre Channel SANs and HP Storage arrays. The HP SR2122 iSCSI Router is used to bridge from
TCP/IP hosts to Fibre Channel storage.
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iSCSI SR2122 Storage Router: Getting Started Guide
Third Edition (September 2003)
Part Number: AA-RTE1C-TE
2iSCSI SR2122 Storage Router: Getting Started Guide
About this Document
This section describes the content reflected in this document, including:
4iSCSI SR2122 Storage Router: Getting Started Guide
iSCSI Protocol
Assumptions
About this Document
The SCSI transport protocol iSCSI maps block-oriented (CDB) storage data over TCP/IP
networks (through iSCSI PDUs). The iSCSI protocol enables universal access to storage
devices and storage-area networks (SANs) over standard Ethernet-based TCP/IP networks.
These networks may be dedicated networks or may be shared with traditional Ethernet
applications. IP LAN/WAN routers and switches can be used to extend the IP storage network
to the wide area of applications such as synchronous and asynchronous remote disk copy or
tape backup and restore.
Note: Although the iSCSI protocol is written as a complete data transport from host to storage this
chapter will only discuss the current HP supported topology of iSCSI hosts to Fibre Channel storage.
The reader should have a thorough understanding of HP’s Fibre Channel Storage networking
products including FC switches and storage as well as a basic understanding of TCP/IP
networking.
5iSCSI SR2122 Storage Router: Getting Started Guide
iSCSI in a Heterogeneous SAN
iSCSI in a Heterogeneous SAN
Although the iSCSI protocol is written as a complete data transport from host to storage this
chapter will only discuss the current HP supported topology of iSCSI hosts to Fibre Channel
storage using the HP SR2122 iSCSI Router.
For further details please read “HP StorageWorks iSCSI storage router 2122 User Guide PN:
304835-002” Section 4 -SCSI Routing Overview.
Typical Network Structure
The addition of iSCSI to the SAN means that two data protocols need to be configured/
managed – TCP/IP and Fibre Channel. IP hosts with iSCSI drivers access the SR2122 through
an IP network connected to the Gigabit Ethernet interface of each SR2122. The SR2122
accesses FC storage devices connected to the Fibre Channel interfaces of each SR2122.
A typical IP/FC network example:
Terminology:
Client, Host, or
iSCSI Initiator
Has the ’iSCSI Driver’
loaded on it to enable
Target resource
recognition & attachment.
’Sees’ the Storage ’Target’
Resources (LUNs) as if they
were just local drives attached
directly to the system.
iSCSI Router
1. Defines Client Access.
2. Defines Paths to Targets.
3. Converts Ethernet IP to
FC protocol and back.
4. Provides Routing functions.
5. Provides Target Addressing.
PROLIANT
8000
ESC
DLT
Fibre Channel Ports
Fibre Channel Switch/Fabric
SD
Server or Workstation
running W2K or Linux
SD
IP Switch/Fabric
Components:
IP Ethernet Protocol
HP SR2122
Storage Router
Gigabit Ethernet Ports
FC Protocol
SAN Storage
Has the LUNs
(resources) configured
without ANY special
drivers, F/W, or
protocols required.
Figure 1: IP/FC Network Example
6iSCSI SR2122 Storage Router: Getting Started Guide
HP
StorageWorks
MSA 1000
Storage
iSCSI Initiator
The IP host, or iSCSI Initiator uses the iSCSI Driver to enable target resource recognition &
attachment to the SR2122 over IP. The iSCSI driver is configured with the Gigabit Ethernet IP
address of each SCSI routing instance running on the SR2122 with which the host is to
transport SCSI requests and responses. The iSCSI initiator sees the storage resources (LUNs)
as if they were just local drives attached directly to the server.
On the SR 2122, IP host access is controlled through an access list and optional VLAN
identifier (VID).
The iSCSI Initiator may use multiple NIC cards with teaming for failover. The term “team”
refers to the concept of multiple network adapters working together as a single network
adapter, commonly referred to as a Virtual Network Adapter.
IP Network
The IP network is the infrastructure used to transfer data between the iSCSI initiator and the
HP SR2122.
SR2122 iSCSI router
The HP SR2122 iSCSI Router is the bridge between the iSCSI Initiators and the SAN storage
that converts IP to FC protocol and provides iSCSI Initiator access to FC storage.
iSCSI in a Heterogeneous SAN
SCSI routing provides IP hosts with access to FC storage devices as if the storage devices were
directly attached to the hosts, with access to devices being managed primarily in the Storage
Router. An iSCSI target (also called logical target) is an arbitrary name for a group of physical
storage devices. The iSCSI targets are created and mapped to physical storage devices attached
to the Storage Router. The Storage Router presents the iSCSI targets to IP hosts (iSCSI
initiators) as if the physical storage devices were directly attached to the hosts.
With SCSI routing, storage devices are not aware of each IP host; the storage devices are
aware of the Storage Router and respond to it as if it were one FC host.
You can configure storage routers in a cluster to allow the storage routers to back each other up
in case of failure.
A storage router cluster consists of two to four storage routers connected as follows:
■Connected to the same hosts
■Connected to the same storage systems
■Connected to each other through their management and high availability (HA) interfaces
In a cluster, storage routers continually exchange HA information to propagate configuration
data to each other and to detect failures in the cluster. The storage routers exchange HA
information through two separate networks: one connected to the management interface of
each Storage Router and the other connected to the HA interface of each Storage Router. To
make sure that HA information is exchanged reliably between storage routers, the storage
routers balance the transmission of HA information between the management and the HA
interfaces.
SR2122 access is controlled through an access list and a VLAN identifier (VID) number of the
hosts. An access list enables access to storage devices attached to the Storage Router with any
combination of host IP address(es), CHAP user name(s), or iSCSI name(s). An access list
contains these combinations. Host VID enables access to storage devices according to the VID
of each host. You can use a combination of access lists and VIDs to configure access in the
Storage Router; that is, you can specify that certain hosts according to IP address in a VLAN
can access storage devices attached to the Storage Router.
7iSCSI SR2122 Storage Router: Getting Started Guide
iSCSI in a Heterogeneous SAN
Fibre Channel SAN
A Storage Area Network is a dedicated, centrally managed, secure information infrastructure,
which enables any-to-any interconnection of servers and storage. SANs are built to incorporate
the best of both storage and networking interfaces: fast and efficient communications
optimized for movement of large amounts of data, but with access to a wide range of other
servers and storage devices on the network.
The SR2122 iSCSI Router is supported on any currently supported HP B-Series, C-Series, or
M-Series switch fabric. For the latest HP switch topoligies and fabric rules, please read the
“HP StorageWorks SAN Design Reference Guide” avalable at:
The SR2122 supports the RA/MA8000, ESA/EMA12000, MSA1000, EVA, VA and XP
storage arrays.
Please read “HP StorageWorks SAN Design Reference Guide” (link above) for the latest HP
storage configurations and rules.
8iSCSI SR2122 Storage Router: Getting Started Guide
SR2122 Hardware and Software Support
This section lists the hardware, devices, and operating systems that are compatible with this
SR2122 Storage Router.
Storage Array Hardware Support
The following HP Storage Array products are supported:
■MSA1000
■RA/MA8000
■ESA/EMA12000
■EMA16000
■Enterprise Virtual Array
■VA7100
■VA7400/7410
■XP128/1024
Fibre Channel Switch Hardware Support
SR2122 Hardware and Software Support
The SR2122 Storage Router is supported with the HP B-Series Product Line switches listed in
Table 9 of the SAN Design Guide (Chapter 3),with the HP C-Series Product Line switches
listed in Table 10, or with the HP M-Series Product Line switches listed in Table 12 of the
SAN Design Guide. View the SAN Design Guide at:
Network Interface Controller (NIC) Hardware Support
The following Proliant Server Network Interface Controllers are supported:
■NC6136 Gigabit Server Adapter
■NC7131 Gigabit Server Adapter
■NC7770 PCI-X Gigabit Server Adapter
The following Blade Server Network Interface Controller is supported:
■NC7781 Gigabit Server Adapter
Operating System Software Support
■Microsoft Windows 2000 SP2 with either Microsoft hotfix Q302895 or Q248720 and
Microsoft hotfix Q318271, SP3
■Microsoft Windows 2003
■MSCS (Windows 2000 and HP iSCSI initiator driver)
■Red Hat Linux v7.3, 8.0 Red Hat Advanced Server 2.1
■Secure Path (Windows 2000 and Windows 2003 with HP iSCSI initiator only)
9iSCSI SR2122 Storage Router: Getting Started Guide
SR2122 Hardware and Software Support
Microsoft Initiator Support
■Windows 2000 server only with SP3
■Microsoft Windows 2003
■MSCS not supported
■Secure Path & Auto Path not supported
■IA64 not supported
■iSNS server not supported
Compaq Network Teaming Software Support
■Compaq Network Teaming (Windows 2000 and Windows 2003 only)
SR2122 Management Software Support
The following HP management software is supported:
■Compaq Insight Manager 7
■HP OpenView Storage Area Manager (SAM)
10iSCSI SR2122 Storage Router: Getting Started Guide
SR2122 Configuration Rules
SR2122 Router Rules
Table 1: SR2122 Router Rules
SR2122 Configuration Rules
Maximum scsirouter instances per SR2122 Router (and per SR2122 Router
Cluster)
Maximum iSCSI host connections per SR2122 SCSI Router instance32
Maximum active targets per SR2122 Router100
■The SR2122’s 2
FC1.
■Direct connect of the SR2122 FC ports to any HP storage array is not supported.
■The SR2122 Management port must be in a different subnet than the SCSI Router
Instances.
ISCSI Host Rules
Table 2: iSCSI Host Rules
Maximum targets accessed per iSCSI hostWindows 2000, 20038
Maximum LUNs per targetWindows 2000, 2003255
Operating System Rules
12
nd
fibre Channel port (FC2) is not supported as a redundant SAN port for
Red Hat Linux16
Red Hat Linux256
■Linux Clustering is not supported.
■HP Secure Path for MSA1000, RA/MA8000, EMA/ESA12000 and Enterprise Virtual
Array for Linux are not supported.
■HP Auto Path for VA/XP for Windows 2000 and Linux are not supported.
■HP Secure Manager on XP and VA is not supported.
Microsoft Initiator Rules
■Supported on Windows 2000 and Windows 2003 only
■MSCS Clusters not supported
11iSCSI SR2122 Storage Router: Getting Started Guide
SR2122 Configuration Rules
Storage Array Rules
■The HSG80 is supported in both SCSI-3 Transparent Failover Mode and Multibus
Failover Mode.
■Without HP Secure Path the Enterprise Virtual Array is supported with the SR2122
accessing only one EVA controller port. This will disable controller failover protection.
■The MSA1000 is supported with the SR2122 accessing only one MSA controller port.
This will disable controller failover protection.
■The SR2122 fibre channel ports appear as host bus adapters to the FC switches and to all
storage arrays.
■Read “HP StorageWorks SAN Design Reference Guide” for the latest HP storage rules.
Fibre Channel Switch/Fabric Rules
■The SR2122 is supported on the B-Series SAN switches, M-Series SAN switches, and
C-Series SAN switches. Read “HP StorageWorks SAN Design Reference Guide ” for the
latest switch topologies and fabric rules.
■The SR2122 should only be zoned with the storage devices that it will access. Zoning the
SR2122 with other servers is not supported.
Management Software Rules
■HP OpenView Storage Area Manager (SAM) support is limited to property support only.
It will identify the device, and by clicking on it, one can launch the device embedded web
server interface or telnet. A device specific plug-in for the SR2122 is available on the
SAM Website.
■CIM 7 Supports the SR2122’s SNMP management capabilities.
■Management of the storage arrays through the SR2122 is not supported. Please use the
recommended application/element manager to configure the storage array.
12iSCSI SR2122 Storage Router: Getting Started Guide
Configuring the SR2122 iSCSI Storage Router in a SAN
Configuring the SR2122 iSCSI Storage Router in a SAN
Configuring the SR2122 in a SAN takes on five distinct steps or sections:
■Setup/configuration of the SR2122 itself
■Adding the SR2122 to a SAN – standalone or clustered
■Serving storage to the SR2122 from the storage arrays over Fibre Channel
■Serving storage to the iSCSI Initiators from the SR2122 over IP.
■Setup/configuration of the iSCSI Initiators
SR2122 Setup
The SR2122 can be configured either as a standalone or clustered device. In Standalone Mode,
as the name implies, the SR2122 does not have failover capabilities to other SR2122s. In
Clustered Mode up to four SR2122s can be used as failover when presenting storage to iSCSI
Initiators.
Note: A Standalone SR2122 can be added to a SR2122 Cluster without re-initializing the
standalone router to preserve its configuration.
For further SR2122 configuration details, please read “HP StorageWorks iSCSI storage router
2122 User Guide PN: 304835-002” Chapter 5 – Configuring the Storage Router.
Whether adding SR2122’s in Standalone or Cluster modes its important to know the WWPN
of the fibre channel ports as they are needed for configuring both SAN zoning and Selective
Storage Presentation (SSP).
To find the WWPN of a FC ports using the SR2122’s CLI enter:
SR2122> show interface "fc1" stats
loop: LOOP READY
connection: F Port
Data Rate: 2 Gb/s
port id: 0xb0700
ALPA: 0x0
firmware: READY
SCSI stats:
35 status IOCB
0 type 1 IOCB
5 marker IOCB
0 unhandled IOCB
WWPN: 28 00 00 02 3d 07 1b c0
.
13iSCSI SR2122 Storage Router: Getting Started Guide
Configuring the SR2122 iSCSI Storage Router in a SAN
To find the WWPN of a FC ports using the SR2122’s GUI, click on the FC port in the Monitor
window:
Figure 2: GUI Display of the FC port WWPN
Adding a Standalone SR2122 to a SAN
The two SR2122 FC ports are recognized as F-Ports by the FC switch and as FC HBAs by the
Storage Arrays. Ports FC1 and FC2 may be used but they cannot be served the same LUN
from the same storage array, as multi-pathing is currently not supported.
After physically connecting the FC port(s), and if zoning is enabled, it is recommended to
create a new zone that includes the FC Port WWPNs and the WWPNs of the storage arrays
that will be serving storage to the SR2122.
Standalone SR2122 examples:
Figure 3: Standalone SR2122; Single SAN
14iSCSI SR2122 Storage Router: Getting Started Guide
Figure 4: Standalone SR2122; Dual SANs
Adding a Clustered SR2122 to a SAN
Configuring the SR2122 iSCSI Storage Router in a SAN
The two SR2122 FC ports on all the clustered SR2122’s are recognized as F-Ports by the FC
switch and as FC HBAs by the Storage Arrays.
After physically connecting the FC port(s), and if zoning is enabled, it is recommended to
create a new zone that includes the FC Port WWPNs and the WWPNs of the storage arrays
that will be serving storage to the SR2122.
Note: Important: Although Multi/Auto Pathing is not supported in a SR2122 clustered
environment,a certain level of failover is available at the SR2122 when configured in a cluster.
Normally, only one SR2122 within the cluster is responsible for the active I/O path between
the iSCSI Initiator and the Storage Array, as an iSCSI Initiator’s I/O cannot be split between
SR2122 Cluster members. If this active Cluster member fails the I/O can switch to another
cluster member. To insure proper failover each cluster member needs one of its FC ports in the
same zone.
Clustered SR2122 Example:
Figure 5: Clustered SR2122
15iSCSI SR2122 Storage Router: Getting Started Guide
Serving Fibre Channel Storage to the SR2122
Serving Fibre Channel Storage to the SR2122
Once the SR2122 is properly configured, connected and zoned within the SAN, the next step is
to present storage to the router.
Where normally the storage is presented to a server, we must first get the FC storage to the
SR2122, then we have to present that storage to the iSCSI Initiators over IP.
As previously mentioned, the SR2122 FC ports look like a typical Fibre Channel Host Bus
Adapter to the storage array. Depending on the storage array it’s now a matter of creating
LUNs and presenting them to the SR2122’s FC port. This section describes how to serve
storage from each supported storage array – MSA1000, RA/MA8000, ESA/EMA12000,
Enterprise Storage Array, VA and XP – to the SR2122.
The assumption is the reader is not only experienced in the initial setup of these storage arrays
but also in the creation of storage volumes or LUNs. This section describes the presentation of
these LUNs to the SR2122. If not, if is suggested to read the configuration/user/reference
guides for the storage array in question.
Please read “HP StorageWorks SAN Design Reference Guide – September 2003 Part Number:
AA-RMPNJ-TE” for the latest HP storage configurations and rules.
Presenting MSA1000 LUNs to the SR2122
MSA1000 storage volumes must be pre-configured before the LUN(s) can be detected and
recognized by the SR2122. The MSA1000 can be configured either through its serial port or
through the Array Configuration Utility.
Whatever method is chosen we must now use the MSA1000’s selective storage presentation
(SSP) commands to restrict access to volumes that are to be served to the SR2122.
Without HP Secure Path, the MSA1000 is supported with the SR2122 accessing only one
MSA controller port. This restriction disables controller failover protection.
First, the Show Connection command will determine if the MSA1000 storage array is aware of
the SR2122 FC port(s).
MSA1000> show connection
Connection Name: “”
Host WWNN = 10000002-3d071bc0
Host WWPN = 28000002-3d071bc0
Profile Name = Default Profile
Unit Offset = 0
Controller 1 Port 1 Status = Online
Next, to enable an ACL, the MSA1000 Volume Unit must be assigned to the SR2122's FC port
WWPN. For example, a Show Unit command may display:
MSA1000> sho units
Unit 1:
In PDLA mode, Unit 1 is Lun 2; In VSA mode, Unit 1 is Lun 1.
Unit Identifier:
Volume Status: VOLUME OK
5 Disk(s) used by lun 1:
16iSCSI SR2122 Storage Router: Getting Started Guide
To present Unit 1 to the SR2122, the command would be:
MSA1000> add acl wwpn=28000002-3d071bc0 unit=1
Allowing 28000002-3d071bc0 access to unit 1.
Whether the MSA 1000 is running in PDLA or VSA Mode will determine how the LUN
number is presented. In PDLA, the SR2122 will see Unit 1 as LUN 2 whereas in VSA Mode
the SR2122 will see the unit as LUN 1.
Note: If using SR2122 Cluster mode, the WWPN for a FC port on each SR2122 cluster member
must be added to the MSA1000 Unit.
The SR2122 should now be able to present Unit 1 as storage to iSCSI Initiators.
Presenting RA/MA8000, ESA/EMA12000, and EMA16000 LUNs to the SR2122
RA/MA8000, ESA/EMA12000, and EMA16000 (HSG80) storage volumes must be
pre-configured before the LUN(s) can be detected and recognized by the SR2122. The HSG80
controllers can be configured either through its serial port or through the HSG Element
Manager application found on the SAN Management appliance.
Whatever method is chosen we must now use the HSG80’s selective storage presentation
(SSP) commands to restrict access to volumes that are to be served to the SR2122.
First, the Show Connection command will determine if the HSG80 is aware of the SR2122 FC
port(s).
18iSCSI SR2122 Storage Router: Getting Started Guide
Serving Fibre Channel Storage to the SR2122
Note: If using SR2122 Cluster mode the WWPN for a FC port on each SR2122 cluster member
must be added to the HSG80 Unit.
The SR2122 should now be able to present D81 as storage to iSCSI Initiators.
Presenting Enterprise Storage Array (EVA) LUNs to the SR2122
Enterprise Virtual Array (HSV110) storage volumes must be pre-configured before the
LUN(s) can be detected and recognized by the SR2122. The HSV110 controllers can only be
configured through the HSV Element Manager application found on the SAN Management
appliance.
Note: If Secure Path is not configured on the iSCSI initiators, then only one HSV port is supported to
connect to the SR2122. Make sure only one of the four ports is included in the same SAN zone as
the SR2122 FC port. Caution: This will prohibit controller failover.
The user must now use the HSV110’s selective storage presentation (SSP) commands to
restrict access to volumes that are to be served to the SR2122.
First, a host entry for the SR2122 must be added to the EVA and assign its WWPN to it using
the HSV Element Manager application.
Open the Storage Array icon and click on hosts. Click the button that appears
on the content screen.
STEP 1: Enter/Add the Host Name
Enter your host's LAN node name.
STEP 2: Enter the IP address (optional)
If your host uses a static LAN IP address, enter the address. Skip this step if your host uses
dynamic IP addresses.
STEP 3: Enter an adapter port World Wide Name: Enter the SR2122’s FC port WWN.
.
STEP 4: Select an operating system – Leave as Microsoft Windows.
STEP 5: Add comments for this entry (optional)
19iSCSI SR2122 Storage Router: Getting Started Guide
Serving Fibre Channel Storage to the SR2122
Click button to save host information.
Your host entry should now look like this:
Figure 6: Host Properties
After the Host entry is created it must be assigned to a LUN. To assign the Host entry to a
LUN, click on the Active icon under the LUN name in the Virtual Disk folder. In the Content
frame click on the button:
Step 1: Use the pull down menu and find the newly created host entry and select it.
Click to save the entry. The virtual disk entry will appear as:
20iSCSI SR2122 Storage Router: Getting Started Guide
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