We had this problem as well.
Our dedicated HBAs would just randomly log out of the Clariion. Presumably
when a SAN Discovery "probe" went out.  We couldn't get it to log back in
without a reboot.  A reboot also caused another Probe though, so we'd only
be up for about 20 minutes.    It was a major outage at multiple data
centers, lots of visibility.  IBM support was trying to upgrade firmware
and drivers but nothing worked.   Finally, a guess worked out and I turned
off SAN Discovery and the problem went away.  Ever since I've been
terrified of SAN Discovery!  (TSM 5.4.1 at the time)

Regards,
Shawn
________________________________________________
Shawn Drew




Internet
Andy.Huebner AT ALCONLABS DOT COM

Sent by: ADSM-L AT VM.MARIST DOT EDU
05/01/2009 11:13 AM
Please respond to
ADSM-L AT VM.MARIST DOT EDU


To
ADSM-L
cc

Subject
Re: [ADSM-L] Tape Drive SN issue






No, tape and disk reside on different fabrics.  There are 7 tape HBAs, 3
of which go to physical tape, two of those have drives with this problem.



Andy Huebner

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Jo Lay
Sent: Thursday, April 30, 2009 1:29 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Tape Drive SN issue

 I am not aware of this problem.  Are you putting disk and tape under the
same HBA?


Regards,

Jo Lay
Tivoli Storage Products, IBM Software Group
jolay AT us.ibm DOT com


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