150 Configuration: Premium Feature—Snapshot Virtual Disks
• Snapshot Virtual Disk Name—A user-specified name that helps you
associate the snapshot virtual disk to its corresponding snapshot repository
virtual disk and source virtual disk.
• 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.
• Capacity Allocation—This parameter allows you to choose where to create
the snapshot repository virtual disk. You can allocate capacity by using one
of the following methods:
– Use free capacity on the same disk group where the source virtual disk
resides.
– Use free capacity on another disk group.
– Use unconfigured capacity and create a new disk group for the
snapshot repository virtual disk.
– Dell recommends placing the snapshot repository virtual disk within
the disk group of the source virtual disk. This ensures that if drives
associated with the disk group are moved to another storage array, all
the virtual disks associated with the snapshot virtual disk remain in
the same group.
• 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.
• Percent Full—When the snapshot repository virtual disk reaches the user-
specified repository full percentage level, the event is logged in the Major
Event Log (MEL). The default snapshot repository full percentage level is
50% of the source virtual disk.
• Snapshot Repository Virtual Disk Full Conditions—Choose whether to
fail writes to the source virtual disk or fail the snapshot virtual disk when
the snapshot repository virtual disk becomes full.
• Host-to-Virtual Disk Mapping—Choose whether to map the snapshot
virtual disk to a host or host group now or to map the snapshot virtual disk
later. The default setting is Map later.
book.book Page 150 Wednesday, May 26, 2010 2:14 PM