Dell PowerVault MD3000 - Manual (Page 75)

Using the Snapshot Feature
75
Re-creating the Snapshot Virtual Disk
To restart a copy-on-write operation, use the recreate snapshot virtualDisk
command. This command starts a fresh copy-on-write operation using an
existing snapshot virtual disk. When you restart a snapshot virtual disk, the
snapshot virtual disk must have either an Optimal or a Disabled state.
The following conditions then occur:
• All copy-on-write data previously on the snapshot repository virtual disk is
deleted.
• Snapshot virtual disk and snapshot repository virtual disk parameters
remain the same as the previously disabled snapshot virtual disk and
snapshot repository virtual disk. You can also change the userLabel,
warningThresholdPercent, and repositoryFullPolicy parameters when you
restart the snapshot virtual disk.
• The original names for the snapshot repository virtual disk are retained.
Preparing Host Servers to Re-create a Snapshot Virtual Disk
NOTICE:
Before you create a new point-in-time image of a source virtual disk, stop
any data access (I/O) activity or suspend data transfer to the source virtual disk and
snapshot virtual disk to ensure that you capture an accurate point-in-time image of
the source virtual disk. Close all applications, including Windows Internet Explorer,
to make sure all I/O activity has stopped.
NOTE:
Removing the drive letter of the associated virtual disk in Windows or
unmounting the virtual drive in Linux will help to guarantee a stable copy of the
drive for the Snapshot.
Before re-creating a snapshot virtual disk, both the server and the associated
virtual disk you are re-creating have to be in the proper state. To ensure that
the host server is properly prepared to re-create a snapshot virtual disk, you
can either use an application to carry out this task, or you can perform the
following steps:
1 Stop all I/O activity to the source and snapshot virtual disk (if mounted).
2 Using your Windows system, flush the cache to both the source and the
snapshot virtual disk (if mounted). At the host prompt, type
SMrepassist -f < filename-identifier >
and press <Enter>. See "SMrepassist Utility" in the User’s Guide for more
information.