Product specifications are subject to change without notice and do not represent a commitment on the part of
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The software described in this document is furnished under a license agreement. You can obtain a copy of that license by
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This document is protected under copyright law. An authorized licensee of Avid Interplay may reproduce this publication for the
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Copyright 1995, Trinity College Computing Center. Written by David Chappell.
Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission
notice appear in supporting documentation. This software is provided "as is" without express or implied warranty.
Copyright 1996 Daniel Dardailler.
Permission to use, copy, modify, distribute, and sell this software for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in
supporting documentation, and that the name of Daniel Dardailler not be used in advertising or publicity pertaining to
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suitability of this software for any purpose. It is provided "as is" without express or implied warranty.
Modifications Copyright 1999 Matt Koss, under the same license as above.
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NEITHER THE AUTHOR NOR AT&T MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
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This product includes software developed by the University of California, Berkeley and its contributors.
The following disclaimer is required by Paradigm Matrix:
Portions of this software licensed from Paradigm Matrix.
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“Install-It” is licensed from Ray Sauers Associates, Inc. End-User is prohibited from taking any action to derive a source code
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has been advised, knew or should have known of the possibility of such damages.
The following disclaimer is required by Videomedia, Inc.:
“Videomedia, Inc. makes no warranties whatsoever, either express or implied, regarding this product, including warranties with
respect to its merchantability or its fitness for any particular purpose.”
“This software contains V-LAN ver. 3.0 Command Protocols which communicate with V-LAN ver. 3.0 products developed by
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Avid Interplay contains components licensed from LavanTech. These components may only be used as part of and in
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Trademarks
888 I/O, Adrenaline, AirPlay, AirSPACE, AirSPACE HD, AirSpeed, AniMatte, AudioSuite, AudioVision, AutoSync, Avid,
Avid DNA, Avid DNxcel, Avid DNxHD, AVIDdrive, AVIDdrive Towers, Avid DS Assist Station, Avid ISIS,
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VideoSPACE, and Xdeck are either registered trademarks or trademarks of Avid Technology, Inc. in the United States and/or
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Footage
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News material provided by WFTV Television Inc.
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Avid Interplay Engine Failover Guide • 0130-07643-02 Rev B • November 2007 • 11/09/07 16:04
Congratulations on your purchase of Avid Interplay, a powerful system for managing media
in a shared storage environment.
This guide is intended for all Avid Interplay administrators who are responsible for
installing, configuring and maintaining an Avid Interplay Engine with the Automatic Server
Failover module integrated.
n
The documentation describes the features and hardware of all models. Therefore, your
system might not contain certain features and hardware that are covered in the
documentation.
Using This Guide
Symbols and Conventions
Avid documentation uses the following symbols and conventions:
Symbol or ConventionMeaning or Action
n
c
w
>This symbol indicates menu commands (and subcommands) in the
t
k
Margin tips
Italic fontItalic font is used to emphasize certain words and to indicate
Courier Bold font
A note provides important related information, reminders,
recommendations, and strong suggestions.
A caution means that a specific action you take could cause harm to
your computer or cause you to lose data.
A warning describes an action that could cause you physical harm.
Follow the guidelines in this document or on the unit itself when
handling electrical equipment.
order you select them. For example, File > Import means to open the
File menu and then select the Import command.
This symbol indicates a single-step procedure. Multiple arrows in a
list indicate that you perform one of the actions listed.
This symbol represents the Apple or Command key. Press and hold
the Command key and another key to perform a keyboard shortcut.
In the margin, you will find tips that help you perform tasks more
easily and efficiently.
variables.
Courier Bold font identifies text that you type.
10
Ctrl+key or mouse actionk+key or mouse action
Press and hold the first key while you press the last key or perform
the mouse action. For example, k+Option+C or Ctrl+drag.
If You Need Help
If you are having trouble using Avid Interplay:
1. Retry the action, carefully following the instructions given for that task in this guide. It
is especially important to check each step of your workflow.
2. Check for the latest information that might have become available after the
documentation was published:
-If the latest information for your Avid product is provided as printed release notes,
they ship with your application and are also available online.
-If the latest information for your Avid product is provided as a ReadMe file, it is
supplied on your Avid installation CD or DVD as a PDF document and is also
available online.
You should always check online for the most up-to-date release notes or ReadMe
because the online version is updated whenever new information becomes
available. To view the online ReadMe, visit the Knowledge Base at
www.avid.com/readme.
3. Check the documentation that came with your Avid application or your hardware for
maintenance or hardware-related issues.
If You Need Help
4. Visit the online Knowledge Base at www.avid.com/onlinesupport. Online services are
available 24 hours per day, 7 days per week. Search this online Knowledge Base to find
answers, to view error messages, to access troubleshooting tips, to download updates,
and to read or join online message-board discussions.
Accessing the Online Library
The Avid Interplay Online Library DVD contains all the Avid Interplay product
documentation in PDF format.
n
You need Adobe® Reader® to view the documentation online. You can download the latest
version from the Adobe web site.
To access the online library from the Online Library DVD:
1. Insert the Online Library DVD into the drive.
2. Double-click the Mainmenu file.
The Online Library includes a Master Glossary of all specialized terminology used in the
documentation for Avid products.
11
Using This Guide
Most Avid online libraries also include multimedia content such as feature presentations.
This multimedia content is an excellent first resource for learning how to use your
application or for helping you understand a particular feature or workflow.
How to Order Documentation
To order additional copies of this documentation from within the United States, call Avid
Sales at 800-949-AVID (800-949-2843). If you are placing an order from outside the United
States, contact your local Avid representative.
Avid Training Services
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methods that accommodate your pressured and competitive work environment.
To learn about Avid's new online learning environment, Avid Learning Excellerator
(ALEX), visit http://learn.avid.com.
12
For information on courses/schedules, training centers, certifications, courseware, and
books, please visit www.avid.com/training or call Avid Sales at 800-949-AVID
(800-949-2843).
Chapter 1
Automatic Server Failover Introduction
This chapter covers the following topics:
•Introduction
•Summary of the Way it Works
•Installing the Failover Hardware Components
•Terminology
Introduction
The automatic server failover mechanism in Avid Interplay allows client access to the
Interplay Engine in the event of failures or during maintenance, with minimal impact on the
availability. A failover server is activated in the event of application, operating system, or
hardware failures. The server can be configured to notify the administrator about such
failures using email.
c
Additional monitoring of the hardware and software components of a high availability
solution is always required. Avid delivers Interplay preconfigured, but additional
attention on the customer side is required to prevent outage (for example, when a
private network fails, RAID disk fails, or a power supply loses power). In a mission
critical environment, monitoring tools and tasks are needed to be sure there are no
silent outages. If another (unmonitored) component fails, only an event is generated,
and while this does not interrupt availability, it might go unnoticed and lead to
problems. Additional software reporting such issues to the IT administration lowers
downtime risk.
The failover cluster is a system made up of two server nodes and a shared storage device
connected over Fibre Channel. These are to be deployed in the same location given the
shared access to the storage device. The cluster uses the concept of virtual servers to specify
groups of resources that failover together.
Chapter 1 Automatic Server Failover Introduction
The following diagram illustrates the failover cluster architecture.
Two-Node Cluster in
Unity MediaNetwork environment
Interplay clients
Intranet
Cluster shared
RAID array
Network Switch
Private network
for heartbeat
Interplay Engine - Cluster Node
Interplay Engine - Cluster Node
n
14
Fibre Switch
If you are already using clusters, the Avid Interplay Engine won't interfere with your
current setup.
Summary of the Way it Works
When the Microsoft® Windows® cluster service is running on the machines and the server is
deployed in cluster mode, the Interplay Engine and its accompanying services are exposed to
users as a virtual server. To clients, however, connecting to the clustered virtual Interplay
Engine appears to be the same process as connecting to a single, physical machine. The user
or client application does not know which node is actually hosting the virtual server.
When the server is online, the resource monitor regularly checks its availability and
automatically restarts the server or initiates a failover to the other node if a failure is
detected. The exact behavior can be configured using the Windows Cluster Administrator
console. Given that clients connect to the virtual network name and IP address, which are
also taken over by the failover node, this minimizes the impact on the availability of the
server. The following diagram illustrates the cluster group.
A failover cluster system includes the following components:
•Two Interplay Engine nodes or two Interplay Archive nodes (SR2400 or SR2500)
•Cluster shared storage - RAID array
SR2400 Slot Locations
The SR2400 is supported as a server for the Interplay applications. This section describes
the slot locations that are specific to the Interplay components in a cluster configuration.
Use the following figure and table as guides to how your SR2400 is configured in an
Interplay cluster environment.
SR2400 Back Panel
Small form factor slots not used
Mouse
PCI slots
Slot 3
Slot 2
Slot 1
n
16
Keyboard
RJ 45 to
serial B
1 Gig
Enet
Video
USB
Serial A to F/C switch if needed
SCSI B
Power supply
2
1
On the SR2400, all boards must be installed starting in the top slot, and the second board
must be in the middle slots, it cannot be in the bottom slot with the middle slot left open.
SR2400 Back Panel Configuration for Avid Unity Environment
Slot
Unity ISIS
Interplay Engine Node and
Archive Engine Node
Unity MediaNetwork
Interplay Engine Node and
Archive Engine Node
3Intel Pro 1000MTATTO
2QLogic CardQLogic Card
1EmptyIntel Pro 1000MT
a. Unity MediaNetwork environment; the Pro 1000MT card is shipped in slot 3 (top). You must move the
card to slot 1 (bottom) and install the ATTO card in slot 3 (top). The Pro 1000MT is not used in an Unity
MediaNetwork environment.
a
SR2500 Slot Locations
The SR2500 is supported as a server for the Interplay applications. This section describes
the slot locations that are specific to the Interplay components in a cluster configuration.
Use the following figure and table as guides to how your SR2500 is configured in an
Interplay cluster environment.
SR2500 Back Panel
Installing the Failover Hardware Components
Mouse
n
Small form factor slots
Slot 2
Slot 1
12
Keyboard
RJ 45 to
serial B
1 Gig
Enet
Video
USB
Serial A to F/C switch if needed
Its important to match the slot locations in the following tables because they match the order
that the drivers are loaded on the SR2500 Recovery DVDs.
PCI slots
Slot 3
Slot 2
Slot 1
SR2500 Back Panel Configuration for Avid Unity Environment
Slot TypeSlot
Unity ISIS
Interplay Engine Node and
Archive Engine Node
Unity MediaNetwork
Interplay Engine Node and
Archive Engine Node
PCI-X3EmptyATTO
2EmptyEmpty
1QLogic Card
a
QLogic Card
Power supplies
Primary power
supply on bottom
a
PCIeNANANA
2Intel Pro 1000PTIntel Pro 1000PT
1EmptyEmpty
a. The SR2500 server might ship with the QLogic card in PCI-X slot 2 (middle). You must move the QLogic card to
PCI-X slot 1 (bottom), because this configuration matches the order that the drivers are loaded on the SR2500
Recovery DVDs.
17
Chapter 1 Automatic Server Failover Introduction
Installing a Failover Cluster in Avid Unity ISIS Environment (SR2400)
The following illustration shows the required cable connections when adding a failover
cluster in an Unity ISIS environment (SR2400 servers). For a description of the connections,
see “Failover Cluster Connections in an Unity ISIS Environment” on page 20.
PCI adapter network interface
right connector
Interplay Engine
Cluster Node
SR2400
To Unity ISIS
left subnet
To Unity ISIS right subnet
Fibre Channel 0
left connector
Right - on board
network interface
Left - on board
network interface
Cluster Shared Storage RAID array
QLogic card
Fibre Channel 1
left connector
Back Panel
Private network
for heartbeat
all switches
set to default
“enabled” left
Interplay Engine
Cluster Node
To Unity ISIS
left subnet
To Unity ISIS
right subnet
FC CH0
LEGEND
Fibre connection
1GB Ethernet connection
Right - on board
network interface
Left - on board
network interface
FC CH1
PCI adapter network interface
right connector
SR2400
Back Panel
QLogic card
18
Installing the Failover Hardware Components
Installing a Failover Cluster in Avid Unity ISIS Environment (SR2500)
The following illustration shows the required cable connections when adding a failover
cluster in an Unity ISIS environment (SR2500 servers). For a description of the connections,
see “Failover Cluster Connections in an Unity ISIS Environment” on page 20.
PCI adapter network interface
right connector
Interplay Engine
Cluster Node
To Unity ISIS
left subnet
To Unity ISIS right subnet
Fibre Channel 0
left connector
Right - on board
network interface
Left - on board
network interface
Cluster Shared Storage RAID array
Slot 3
Slot 2
Slot 1
QLogic card
Fibre Channel 1
left connector
SR2500
Back Panel
Private network
for heartbeat
all switches
set to default
“enabled” left
Interplay Engine
Cluster Node
To Unity ISIS
left subnet
To Unity ISIS
right subnet
FC CH0
LEGEND
Fibre connection
1GB Ethernet connection
PCI adapter network interface right connector
Right - on board
network interface
Left - on board
network interface
FC CH1
SR2500
Back Panel
QLogic card
19
Chapter 1 Automatic Server Failover Introduction
Failover Cluster Connections in an Unity ISIS Environment
Make the following cable connections to add a failover cluster to an Unity ISIS environment:
•First cluster node:
-Left - on board network interface connector to Unity ISIS Left subnet
-Right - on board network interface connector to Unity ISIS Right subnet
-QLogic card connector to cluster shared storage RAID array - left Fibre Channel 1
connector
•Second cluster node:
-Left - on board network interface connector to Unity ISIS Left subnet
-Right - on board network interface connector to Unity ISIS Right subnet
-QLogic card connector to cluster shared storage RAID array - left Fibre Channel 0
connector
•Right connector on PCI adapter network interface in the first cluster node to right
connector on PCI adapter network interface in second cluster node (private network for
heartbeat)
•All switches on the Infortrend cluster shared storage RAID array are in the default
“enable” position (left)
20
For more details, see the illustrations in:
•“Installing a Failover Cluster in Avid Unity ISIS Environment (SR2400)” on page 18.
•“Installing a Failover Cluster in Avid Unity ISIS Environment (SR2500)” on page 19.
Installing the Failover Hardware Components
Installing a Failover Cluster in an Avid Unity MediaNetwork
Environment (SR2400)
The following illustration shows the required cable connections when adding a failover
cluster in an Unity MediaNetwork environment (SR2400 servers). For a description of the
connections, see “Failover Cluster Connections in an Unity MediaNetwork Environment” on
page 23.
ATTO ca r d
Interplay Engine
Cluster Node
SR2400
Back Panel
To Unity
MediaNetwork
FC switch
To Ethernet
Public Network
all switches set to
default “enabled” left
Interplay Engine
Cluster Node
To Ethernet
Public Network
Private network
for heartbeat
Right - on board
network interface
Left - on board
network interface
Fibre Channel 0
left connector
FC CH0
ATTO ca r d
Right - on board
network interface
Left - on board
network interface
QLogic card
PCI adapter network interface - not used
Fibre Channel 1
left connector
Cluster Shared Storage RAID array
FC CH1
To Unity
MediaNetwork
FC switch
SR2400
Back Panel
QLogic card
PCI adapter network interface - not used
LEGEND
Fibre connection
1GB Ethernet connection
21
Chapter 1 Automatic Server Failover Introduction
Installing a Failover Cluster in an Avid Unity MediaNetwork
Environment (SR2500)
The following illustration shows the required cable connections when adding a failover
cluster in an Unity MediaNetwork environment (SR2500 servers). For a description of the
connections, see “Failover Cluster Connections in an Unity MediaNetwork Environment” on
page 23.
PCI adapter network
interface - not used
Interplay Engine
Cluster Node
To Ethernet
Public Network
all switches set to
default “enabled” left
Interplay Engine
Cluster Node
Private network
for heartbeat
ATTO ca r d
Slot 3
Slot 2
Slot 1
Right - on board
network interface
Left - on board
network interface
Fibre Channel 0
left connector
FC CH0FC CH1
Cluster Shared Storage RAID array
ATTO ca r d
QLogic card
To Unity
MediaNetwork
FC switch
SR2500
Back Panel
Fibre Channel 1
left connector
To Unity
MediaNetwork
FC switch
To Ethernet
Public Network
22
LEGEND
Fibre connection
1GB Ethernet connection
Right - on board
network interface
Left - on board
network interface
SR2500
Back Panel
QLogic card
Installing the Failover Hardware Components
Failover Cluster Connections in an Unity MediaNetwork Environment
The Interplay Engine Cluster nodes (SR2400 servers) ship with an Intel Pro 1000 MT card
in slot 3 (top). You need to move this card to slot 1 (bottom). Then add an ATTO host bus
adapter in slot 3 (top).
Make the following cable connections to add a failover cluster to an Unity MediaNetwork
environment:
•First cluster node:
®
-Left - on board network interface connector to Ethernet
public network
-QLogic card connector to cluster shared storage RAID array - left Fibre Channel 1
connector
-ATTO card connector to Unity MediaNetwork FC switch
•Second cluster node:
-Left - on board network interface connector to Ethernet
public network
-QLogic card connector to cluster shared storage RAID array - left Fibre Channel 0
connector
-ATTO card connector to Unity MediaNetwork FC switch
•Right on board network interface connector on the first cluster node to right on board
network interface connector on the second cluster node (private network for heartbeat)
•All switches on the Infortrend cluster shared storage RAID array are in the default
“enable” position (left)
For more details, see the illustration in:
•“Installing a Failover Cluster in an Avid Unity MediaNetwork Environment (SR2400)”
on page 21.
•“Installing a Failover Cluster in an Avid Unity MediaNetwork Environment (SR2500)”
on page 22.
23
Chapter 1 Automatic Server Failover Introduction
Terminology
Clustering is not always straightforward, so it is important that you get familiar with the
terminology of server clusters before you start. A good source of information is the
Microsoft Technology Center for Clustering Services under:
Here is a brief summary of the major concepts and terms:
•Nodes - refers to individual computers.
•Cluster service - refers to the group of components on each node that perform a
cluster-specific activity.
•Resource - refers to cluster components (hardware and software) that are managed by
the cluster service. Physical hardware devices such as disk drives, and logical items such
as IP addresses and applications are referred to as resources.
•Online - refers to a resource that is available and is providing its service.
•Quorum resource - is a special common cluster resource. This resource plays a critical
role in cluster operations.
24
•Resource group - refers to a collection of resources that are managed by the cluster
service as a single, logical unit.
Chapter 2
Automatic Server Failover Installation
This chapter describes the processes for configuring the automatic server failover. It is
crucial that you follow the instructions given in this chapter completely, otherwise the
automatic server failover will not work.
You can install the cluster service during any step of the overall Avid Interplay
installation process. For the Cluster Group, create a partition on the cluster shared RAID
array. This partition is used as the quorum disk (4GB). You also need to create two more
partitions: a partition for the MSDTC (see “Installing the Distributed Transaction
Coordinator” on page 54) and a large partition for the server databases. The latter is to store
both the database and the non Avid files. Activate the volumes on both nodes and assign
identical drive letters as described in “Configuring the Cluster Shared RAID Disks on Each
Node” on page 37.
n
Do not install any other software on the cluster machines except the Interplay engine.
For more details about server clusters, see the Microsoft document "Guide to Creating and
Configuring a Server Cluster under Windows Server 2003":
•Installing the Distributed Transaction Coordinator
•Disabling Any Web Servers
•Installing the Interplay Engine on the First Node
•Installing Interplay Engine on the Second Node
•Bring the Interplay Engine Online
•Testing the Complete Installation
•Updating a Clustered Installation
•Uninstalling the Interplay Engine
Requirements
Hardware
A dual server failover cluster capable system with a cluster shared RAID disk set is needed.
The automatic server failover system was developed on and tested with the following:
•Intel Server Chassis SR2500 Packaged Cluster, which is the recommended hardware:
The servers in a cluster are connected using one or more cluster shared storage buses and
one or more physically independent networks acting as a heartbeat.
Server Software
Two licenses of Windows Server 2003 Enterprise Edition or Windows Server 2003
Datacenter Edition are needed.
26
Space Requirements
The default disk configuration for the cluster shared RAID array is as follows:
•Quorum disk - 4GB
•MSDTC disk - 5GB
•Database disk - 925GB or larger
Antivirus Software
You can run antivirus software on a cluster, if the antivirus software is cluster-aware. For
information about cluster-aware versions of your antivirus software, contact the antivirus
vendor. If you are running antivirus software on a cluster, make sure you exclude these
locations from the virus scanning: Q:\ (Quorum disk), C:\Windows\Cluster, and
S:\Workgroup_Databases (database).
Need To Know
Before you setup a cluster in an Avid Interplay environment, you should be familiar with the
following functions:
•Microsoft Windows Active Directory Domains & Domain Users
Requirements
•Microsoft Windows Clustering (current version, as there are changes from prior version)
•Disk configuration (format, partition, naming)
•Network configuration
27
Chapter 2 Automatic Server Failover Installation
Before You Start: Preparation
Before you begin the installation process you need to obtain some IP addresses, IP host
names, domain user accounts, and establish server addresses on your network.
•Establish the subnet mask, the gateway, DNS and WINS server addresses on your
network.
•Install and setup an Avid Unity client on the Interplay Engine servers. See the Avid
Unity MediaNetwork File Manager Setup Guide or the Avid Unity ISIS System Setup
Guide.
•An Avid Unity user account with read and write privileges. This account is not needed
for the installation of Interplay Engine, but is required for the operation of
Interplay Engine.
•You need two domain user accounts when configuring a cluster:
n
You can use one account for the Cluster Service Account and the Cluster Installation
Account. However, this allows the Cluster Service Account more privileges than are needed.
-Cluster Service Account (Server Execution)—Decide on the cluster user name. The
procedures in this document use sqauser as an example for the Cluster Service
Account. This user account must have a unique name and be a domain user. This
user is assigned administrative rights on both servers. The Interplay Engine service
also runs under this account; you should be aware of this during the set up. The
server needs to access the media files and this might be a consideration when these
are to be located on a non-default location, that is, when the Avid Unity mounting
feature is going to be used.
For information on creating a cluster user account, see the Microsoft document
"Guide to Creating and Configuring a Server Cluster under Windows Server 2003":
-Cluster Installation Account—Identify the user account to use during the
installation process. This user account is a domain user account with privileges to
add servers to the domain. This user account is only required during the installation
of the cluster.
•An existing Active Directory Domain is required before installing or configuring the
cluster.
•You need several static IP addresses for all network interfaces and host names. See “List
of IP Addresses and Network Names” on page 29.
28
List of IP Addresses and Network Names
You need to reserve IP host names and static IP addresses before you begin the installation
process. A Unity ISIS environment needs 8 IP addresses and a Unity MediaNetwork needs
5 IP addresses. The following table provides a list of example names that you can use when
configuring the cluster. The procedures in this chapter use these example names.
Before You Start: Preparation
n
n
Make sure that these IP addresses are outside of the range that is available to DHCP so they
cannot automatically be assigned to other machines.
If your Active Directory Domain and/or DNS domain include more than one cluster, to avoid
conflicts, you need to make sure the cluster names, MSDTC names, and IP addresses are
different for each cluster.
Required IP Addresses and Node Names
Node or ServiceItem RequiredExample NameWhere Used
First Cluster Node •1 Host Name
•2 ISIS IP addresses - public
(one for left and one for right)
•1 IP address - private
(Heartbeat)
Second Cluster Node •1 Host Name
•2 ISIS IP addresses - public
(one for left and one for right)
•1 IP address - private
(Heartbeat)
Cluster service•1 Network Name
(virtual host name)
•1 ISIS IP address
MSDTC service —
Distributed Transaction
Coordinator
Interplay Engine
service
•1 Network Name
(virtual host name)
•1 IP address
•1 Network Name
(virtual host name)
•2 ISIS IP addresses - public
(one for left and one for right)
a
a
a
a
a
SECLUSTER1See “Configuring the Cluster
Service on the First Node”
b
SECLUSTER2See “Configuring the Cluster
b
SECLUSTERSee “Configuring the Cluster
CLUSTERMSDTC See “Assigning a Network
SEENGINESee “Specifying the Interplay
b
on page 39 and “Creating a
Resource Group for the
Distributed Transaction
Coordinator” on page 55.
Service on the Second Node”
on page 44 and “Creating a
Resource Group for the
Distributed Transaction
Coordinator” on page 55.
Service on the First Node”
on page 39.
Name to the MSDTC Group”
on page 57.
Engine Details” on page 64
and “Specifying the Interplay
Engine Name” on page 65.
a. All names must be a valid and unique network host name.
b. In an Avid Unity MediaNetwork environment you only need one public IP address.
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