Hello,
Do you use IBM Tape Drivers ? LTO ? There is a feature within recent 
drivers to control lun persistence, this is described in the release notes 
for the drivers, that may be beneficial for you to implement. 
The recent version of Legato software is also offering this feature, 
reboot the server and make sure drive order is consistant.If you continue 
to have drives go in service mode and you are confident that drive order 
is not the issue, i would check the FC switch for any errors, 
misconfiguration & Tape Lib log for clues.
There must be diagnostics on the Tape lib to run as well.
HTH



psoni <networker-forum AT BACKUPCENTRAL DOT COM> 
Sent by: EMC NetWorker discussion <NETWORKER AT LISTSERV.TEMPLE DOT EDU>
12/23/2008 11:06 AM
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Subject
tape drive : service mode






There were no issues during loading/unloading of the tapes in all the 
drives ( total 4 drives ) 

On few hosts, the "pesistent binding" tab for the tape drives hasn't been 
checked in SAN surfer HBA manager.

There are 2 HBAs / host and each one is accessing 2 drives in the library.

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