How to troubleshoot backup jobs that complete with an error or exception "Failed to mount one or more virtual disk images"

Article:TECH63607

Created: 2009-01-28

Updated: 2011-11-14

Article URL http://www.symantec.com/docs/TECH63607

Article Type
Technical Solution

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Problem

How to troubleshoot backup jobs that complete with an error or exception "Failed to mount one or more virtual disk images" in Backup Exec 12.5 when protecting Virtual Machines stored within VMware ESX 3.5

Error

V-79-57344-38721 - Failed to mount one or more virtual disk images

Cause

Several configurations can cause the above error. Please review the possible causes below, and reference the matching solution.

1. Backing up the same virtual machine running concurrently to the same temporary staging location.

2. The VMware Consolidated Backup (VCB) is not installed.

3. The VMware Consolidated Backup is not targeted correctly in the backup job properties.

All of these scenarios when using the Agent for VMware Virtual Infrastructure will cause the job to report the error or exception "V-79-57344-38721 - Failed to mount one or more virtual disk images". The GRT (Granular Restore Technology) functionality will fail for this backup, and individual file restores will not be possible as the VMware Consolidated Backup (VCB) is not able to mount the image file.

Solution

1. Avoid conflicts of the scheduled jobs so that they do not overlap while taking backup of the same virtual machine.

2. Install the VMware Consolidated Backup .
Please refer : http://www.vmware.com/download/vi/drivers_tools.html

3. Verify the location where VMware Consolidated Backup is installed, in comparision with the location specified in the backup job properties.

If the issue still occurs after performing the steps mentioned above, review the TechNotes in the Related Documents Section below for additional troubleshooting information.