HP StorageWorks Enterprise Virtual Array Cluster FIO Starter Kit Guide de l'utilisateur télécharger pdf (Page 105)

8. In the DOS command prompt window on the server, mount the view by typing vshadow.exe

-el={Snapshot ID},k:\ and pressing Enter.

The vshadow.exe -el={Snapshot ID},k:\ command mounts the view to the host server

with the specified mount point. In this example the mount point was selected to be the drive letter

k:, but the mount point can be any one of these:

• Drive letter

• Directory share

• Network share

9. Open the newly mounted snapshot. Make sure that the snapshot has the data of the original

virtual disk at the time you created the snapshot.

10. Remove the VSS shadow copy by typing vshadow.exe -ds={SnapShotID} and pressing

Enter.

The vshadow.exe -ds={SnapShotID} command unmounts the snapshot on the host and

deletes the snapshot and PiT on the VSM.

11. To create a persistent VSS shadow copy with a snapshot that can be presented to another host,

type vshadow.exe -p -t=export.xml m: and press Enter.

The vshadow.exe -p -t=export.xml m: command creates a shadow set that you can

transport to another host. VSS generates a backup component document, which is export.xml,

that you can use for introducing the shadow set to another host by using the import option.

12. To import a shadow set to another host, type vshadow -i=export.xml on the host into which

you are importing the shadow set and press Enter.

Integrating VSS with asynchronously mirrored VSM virtual disks

When VSM receives a request to create a VSS snapshot on an asynchronously mirrored virtual disk,

VSM handles this as a request to create a user PiT, with a snapshot, on that virtual disk. Creating a

user PiT for the VSS request indicates that this PiT was taken while the application was in backup

mode. However, the snapshot that is created in order to comply with VSS requirements, prevents the

mirror from progressing. The mirror cannot delete older PiTs because the snapshots use the older PiTs.

The mirror also cannot create new PiTs because the older PiTs exist.

The solution to correct this situation is to create the PiT using VSS and delete the snapshot after the

snapshot is created to allow the asynchronous mirror to progress. You can achieve this solution by

using the VShadow utility to create non-persistent shadow copies. An example of the command to

create a non-persistent shadow copy for drive m: is vshadow.exe m:.

If the application uses multiple drives, you must include all of the drives in the command.

To run this command several times, at predefined intervals, place the command into a command file,

and configure the Windows scheduler to run the command file at the required intervals.

When the VShadow utility completes running this command, the shadow copy that the VShadow

utility created for drive m:\ is deleted. On VSM, however, the user PiT that was created remains.

Only the snapshot that VShadow created for the user PiT is deleted. As long as the user PiT remains

in the system, the you can create a snapshot on it, and present the snapshot to the server for recovery.

The user PiT is eventually deleted according to the operation rules for asynchronous mirrors.

Integrating VSS with backup software

A backup solution involves these components:

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