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154 Configuration: Premium Feature—Snapshot Virtual Disks
• Percent Full—When the snapshot repository virtual disk reaches the
specified repository full percentage level, the event is logged in the Major
Event Log (MEL). The default snapshot repository full percentage level is
50 percent of the source virtual disk.
• Snapshot Repository Virtual Disk Full Conditions—When the snapshot
repository virtual disk becomes full, you are given a choice of failing write
activity to the source virtual disk or failing the snapshot virtual disk.
Preparing Host Servers to Create the Snapshot Using the Simple Path
NOTE: Before using the Snapshot Virtual Disks Premium Feature in a Microsoft
Windows clustered configuration, you must first map the snapshot virtual disk to
the cluster node that owns the source virtual disk. This ensures that the cluster
nodes correctly recognize the snapshot virtual disk.
NOTE: Mapping the snapshot virtual disk to the node that does not own the source
virtual disk before the Snapshot enabling process is completed can result in the
operating system mis-identifying the snapshot virtual disk. This, in turn, can result in
data loss on the source virtual disk or an inaccessible snapshot.
NOTE: For details on mapping the snapshot virtual disk to the secondary node,
refer to the
Dell PowerVault MD3600i and MD3620i Storage Arrays With Microsoft
Windows Server Failover Clusters
on support.dell.com/manuals.
NOTE: You can create concurrent snapshots of a source virtual disk on both the
source disk group and on another disk group.
Before creating a Snapshot Virtual Disk, note that:
• The following types of virtual disks are not valid source virtual disks:
• Snapshot repository virtual disks
• Snapshot virtual disks
• Target virtual disks that are participating in a virtual disk copy
NOTE: Virtual Disk Copy is an Advanced (Premium) feature.
• You cannot create a snapshot of a virtual disk that contains unreadable
sectors.
• You must satisfy the requirements of your host operating system for
creating snapshot virtual disks. Failure to meet the requirements of your
host operating system results in an inaccurate snapshot of the source
virtual disk or the target virtual disk in a virtual disk copy.
book.book Page 154 Thursday, December 9, 2010 3:20 PM