Dell PowerVault MD3000 - Manual (Page 82)

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Snapshot Virtual Disks
4 Remove the drive letter(s) of the source and (if mounted) snapshot virtual
disk in Windows or unmount the virtual drive(s) in Linux to help
guarantee a stable copy of the drive for the Snapshot. If this is not done,
the snapshot operation will report that it has completed successfully, but
the snapshot data will not be updated properly.
5 Follow any additional instructions for your operating system. Failure to
follow these additional instructions can create unusable snapshot virtual
disks.
NOTE:
If your operating system requires additional instructions, you can find
those instructions in your operating system documentation.
Re-creating a Snapshot Virtual Disk
After first preparing the host server(s) as specified in the preceding procedure,
re-create a snapshot virtual disk using the following steps.
NOTICE:
This action invalidates the current snapshot.
1 Click the Modify tab, then click Modify snapshot virtual disks.
2 Click Re-create Snapshot Virtual Disks.
3 Highlight the snapshot virtual disk to re-create and click Re-Create
beneath the list.
4 In the Confirm Snapshot Virtual Disk Re-Creation dialog box, type
yes
and then click OK.
Re-creating a snapshot repository virtual disk uses the previously configured
snapshot name and parameters.