Dell PowerVault MD3000 - Manual (Page 63)

Using the Snapshot Feature
63
Using Host Servers to Create an Initial Snapshot
Virtual Disk
NOTICE:
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.
If you map the snapshot virtual disk to the node that does not own the source virtual
disk before the snapshot enabling process is completed, the operating system may
fail to correctly identify the snapshot virtual disk. This can result in data loss on the
source virtual disk or an inaccessible snapshot.
For details on mapping the snapshot virtual disk to the secondary node, refer to the
Dell
PowerEdge™ Cluster SE600W Systems Installation and Troubleshooting Guide
on support.dell.com
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 the following:
• 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.
• 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 point-in-time image of the
source virtual disk or the target virtual disk in a virtual disk copy.
Creating a Snapshot Virtual Disk
The create snapshotVirtualDisk command provides three methods for
defining the physical disks for your snapshot repository virtual disk:
• Define each physical disk for the snapshot repository virtual disk by
enclosure ID and slot ID.
• Define a disk group in which the snapshot repository virtual disk resides.
Optionally define the capacity of the repository virtual disk.