Configuration: Premium Feature—Snapshot Virtual Disks 147
• Snapshot Repository Virtual Disk Name—A user-specified name that
helps you associate the snapshot repository virtual disk to its corresponding
snapshot virtual disk and source virtual disk.
• Snapshot Repository Virtual Disk Capacity—The snapshot repository
virtual disk capacity is expressed as a percentage of the source virtual disk
capacity. The maximum percentage allowed is 120 percent.
Using the simple path, the following defaults are used for the other
parameters of a snapshot virtual disk:
• Capacity Allocation—The snapshot repository virtual disk is created using
free capacity on the same disk group where the source virtual disk resides.
• Host-to-Virtual Disk Mapping—The default setting is
Map now
.
• 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™ MD3200i and MD3220i 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:
book.book Page 147 Wednesday, May 26, 2010 2:14 PM