Manualshelf

HP StorageWorks EVA Cluster Extension Software Administrator Guide (T3667-96045, April 2010)

ManualsBrandsHP ManualsComputer AccessoriesHP 3PAR Cluster Extension Software Windows Array Media LTU
11121314151617181920
NOTE:
Vdisks are virtual disks used in an HP EVA storage system for the storage of application data. A DR
group includes one or more vdisks in an EVA storage system. The DR group is the unit in which EVA
Cluster Extension failover/failback operations are performed. For more information about DR groups,
see the
HP StorageWorks Continuous Access EVA Implementation Guide
.
If the links between your storage systems are broken, depending on the configuration, the source EVA
can log all the write I/Os of a DR group member to a write history log and replicate the changes
later after the links become available. In case of a failover, EVA Cluster Extension takes the appropriate
action for each link/array status and makes sure that your application service has the latest data.
Cluster setup considerations
For quorum considerations that apply to Windows and Linux, see:
• MSCS, page 11
• SLE HA cluster setup considerations, page 12
• RHCS cluster setup considerations, page 14
MSCS
MSCS depends on a quorum resource to maintain a persistent log of cluster configuration changes
and status, as well as a single point to resolve any possible events that could result in a split-brain
situation. EVA Cluster Extension supports the following quorum configurations in which one site failure
will not cause the entire cluster to fail.
Windows Server 2008/2008 R2
• Node Majority
• Node and File Share Majority
Windows Server 2003
• Majority Node Set (MNS)
• Majority Node Set with File Share Witness
NOTE:
File Share Witness support:
• Windows Server 2003 supports only two node clusters when using File Share Witness.
• Windows Server 2003 Service Pack 2 supports MNS with File Share Witness.
• When using Microsoft Windows Server 2003 Service Pack 1 (SP1)-based server cluster or Windows
Server 2003 R2-based server cluster, you must apply a Microsoft patch to support MNS with File
Share Witness. See your Microsoft documentation for more information.
EVA Cluster Extension has been certified to fulfill all requirements for geographically dispersed
Microsoft clusters. For certified configurations, see the Windows Vista Hardware Compatibility List
and the Windows Server Catalog on the Microsoft website.
EVA Cluster Extension Software Administrator Guide 11