We had something similar, also with a STK SL500 with LTO4 drives, but it
turned out to be the FC HBA in the TSM server system.

Roger Deschner      University of Illinois at Chicago     rogerd AT uic DOT edu
== "History does not repeat itself, but it does rhyme." -- Mark Twain ==



On Fri, 20 Aug 2010, Dury, John C. wrote:

>We have an STK SL500 tape library with 4 LTO4 drives in it and it seems to 
>randomly take all of the drives offline. STK/Sun has replaced the robot and 
>controller card (more than once) and nothing seems to help. This has been 
>going on for several months now and I'm at a loss to figure out what is 
>causing it. The SL500 and it's drives are all attached to a Brocade DS-4900 
>switch. Nothing has changed on the switch in over a year as putting 
>maintenance on them is a real chore since we have so many devices attached to 
>it.  The only message I see in the act log is:
>ANR8848W Drive WRLTO4-1 of library WRSL500 is
> inaccessible; server has begun polling drive. (PROCESS:
> 832)
>As best I can tell, it is a hardware problem as even rebooting the robot or 
>power cycling  the whole box doesn't fix it. The robot stays parked at the top 
>and never seems to go through the audit it usually does when it is rebooted. 
>If it is indeed a hardware problem, I realize there isn't much that can be 
>done but they have replaced almost all the parts in the box and it keeps 
>happening. Anyone else ever have similar problems?
>John
>