All -

First post, so take it easy on me, OK?

Environment:
NW 7.6SP1, RHEL 5.4, Fibre attached DataDomain VTL's

As I run a backup and the VTL is loading/labeling/using tapes, I 
intermittently get errors similar to the following:

7224 02/16/2011 05:51:48 PM  nsrd [Jukebox `MYLIB', operation # 3541]. 
read open error: there was not a device file name passed in to CDI (drive 
status is DRIVE_STATUS_UNSET)
7224 02/16/2011 05:51:48 PM  nsrd [Jukebox `MYLIB', operation # 3541]. 
Error reading volume label: read open error: there was not a device file 
name passed in to CDI (drive status is DRIVE_STATUS_UNSET)

These errors come from drives that have been working successfully in the 
past.  I can do a full library/storage node reset, and things seem to 
improve.  I believe the most important aspect is that this seems 
intermittant.  (which makes it difficult to troubleshoot!)  

Any ideas as to cause, or troubleshooting techniques, would be greatly 
appreciated.

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