Not all tape drives in library can be used concurrently.
It may be noticed that all the drives in a multiple drive library may not be used at the same time. This behavior is also usually seen with a searching through the library for tapes before the jobs start as well.
There is no error other than the extra tape drive(s) will sit queued until the first job(s) are done.
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This issue is currently under investigation by Symantec Corporation. Pending the outcome of the investigation, this issue may be resolved by way of a patch or hotfix in current or future revisions of the software. However, this particular issue is not currently scheduled for any release. If you feel this issue has a direct business impact for you and your continued use of the product, please contact your Symantec Sales representative or the Symantec Sales group to discuss these concerns. For information on how to contact Symantec Sales, please see http://www.symantec.com Please be sure to refer back to this document periodically as any changes to the status of the issue will be reflected here.
Customers experiencing this issue are encouraged to contact Symantec Technical Support as data is still being collected to assist in resolving this issue.