HP ProLiant 4500 Compaq ProLiant Cluster HA/F100 and HA/F200 Administrator Gui - Page 60

Shared Storage Capacity, Configuring Compaq RAID Technology for Database Servers

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Designing the Compaq ProLiant Clusters HA/F100 and HA/F200 2-29 Shared Storage Capacity Each server is connected to shared storage (the Compaq StorageWorks RAID Array 4000 storage system), which mainly stores data files of clustered applications and services. Follow the guidelines below to determine how much capacity is needed for your shared storage. NOTE: For some clustered applications, it may make sense to store the application program files on shared storage. If the application allows customization and the customized information is stored in program files, the program files should be placed on shared storage. When a failover event occurs, the secondary node will launch the application from shared storage. The application will execute with the same customizations that existed when executed on the primary node. Two factors help to determine the required amount of shared storage disk space: s The amount of space required for all clustered applications and their dependencies. s The level of data protection (RAID) required for each type of data used by each clustered application. Two factors driving RAID requirements are:  The performance required for each drive volume  The recovery time required for each drive volume IMPORTANT: Windows NT software RAID is not available for shared drives when using MSCS. Hardware RAID is the only available RAID option for shared storage. For more information about hardware RAID, see the following: s Compaq StorageWorks Fibre Channel RAID Array 4000 User Guide s Configuring Compaq RAID Technology for Database Servers (TechNote 184206-001), available at the Compaq website (http://www.compaq.com). In the "Cluster Groups" section of this chapter, you created a resource dependency tree, then transferred that information into a Cluster Group Definition Worksheet (Figure 2-7). Under the resource dependencies in the worksheet, you listed at least one physical disk resource. For each physical disk resource, determine the capacity and level of protection required for the data to be stored on it.

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Designing the Compaq ProLiant Clusters HA/F100 and HA/F200
2-29
Shared Storage Capacity
Each server is connected to shared storage (the Compaq StorageWorks RAID
Array 4000 storage system), which mainly stores data files of clustered
applications and services. Follow the guidelines below to determine how much
capacity is needed for your shared storage.
NOTE:
For some clustered applications, it may make sense to store the application
program files on shared storage. If the application allows customization and the
customized information is stored in program files, the program files should be placed on
shared storage. When a failover event occurs, the secondary node will launch the
application from shared storage. The application will execute with the same
customizations that existed when executed on the primary node.
Two factors help to determine the required amount of shared storage disk
space:
■
The amount of space required for all clustered applications and their
dependencies.
■
The level of data protection (RAID) required for each type of data used
by each clustered application. Two factors driving RAID requirements
are:
±
The performance required for each drive volume
±
The recovery time required for each drive volume
IMPORTANT:
Windows NT software RAID is not available for shared drives when using
MSCS. Hardware RAID is the only available RAID option for shared storage.
For more information about hardware RAID, see the following:
■
Compaq StorageWorks Fibre Channel RAID Array 4000 User Guide
■
Configuring Compaq RAID Technology for Database Servers
(TechNote 184206-001), available at the Compaq website
(
.
In the “Cluster Groups” section of this chapter, you created a resource
dependency tree, then transferred that information into a Cluster Group
Definition Worksheet (Figure 2-7). Under the resource dependencies in the
worksheet, you listed at least one physical disk resource. For each physical
disk resource, determine the capacity and level of protection required for the
data to be stored on it.