Verifying and repairing mirrored VDisk copies

The virtual disk (VDisk) copy verification process checks if data on mirrored VDisk copies match. You can choose repair options if differences are found during the verification process.

Attention: Proceed with this task only if all VDisk copies are synchronized.

Use the Verifying VDisk Copies panel to start the VDisk copy verification process for a selected VDisk. If differences are found during verification, you can choose one of the following actions.

Stop the process when the first difference is found. Select this option if you only want to verify that the mirrored VDisk copies are identical. You can run this option, starting at a different logical block address (LBA) each time to count the number of differences on a VDisk.
Automatically repair the copy by overwriting sectors with data from the primary VDisk copy. Select the resync option if you are sure that either the primary VDisk copy data is correct or that your host applications can handle incorrect data.
Create a virtual medium error at the VDisk level. Select this option if you are unsure what the correct data is and you do not want an incorrect version of the data to be used.

If a medium error is encountered on one of the copies, the VDisk copy is automatically repaired if the data can be read from another copy.

This task assumes that you have already launched the SAN Volume Controller Console.

Perform the following steps to verify mirrored VDisk copies:

Click Work with Virtual Disks > Virtual Disks in the portfolio. The Viewing Virtual Disks panel is displayed.
Select the VDisk to verify and then select Verify VDisk Copies from the task list. Click Go. The Verifying VDisk Copies panel is displayed.
Select the repair action if errors are found and click OK. You can also specify an LBA from which to start the verification. Start at different LBAs to count the number of differences on a VDisk.