Verify whether the status of the disk library, mount path, and the device is Online.
Cause
If the status is Online, the mount failure might occur if there are no drive letters are available in the operating system to mount the volume for the job.
Resolution
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Make sure that there are sufficient drive letters available in the operating system for each device to mount the volume.
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If all the drive letters are used, disconnect and make some drive letter available before resuming the job.