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Date:      Thu, 1 May 1997 09:32:21 -0400 (EDT)
From:      Cliff Addy <fbsdlist@federation.addy.com>
To:        freebsd-questions@freebsd.org
Subject:   failure on scsi tape drive
Message-ID:  <Pine.BSF.3.95q.970501092347.3366A-100000@federation.addy.com>

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A system that had been backing up to tape just fine suddenly began failing
(and locking up).  Here are the syslog messages:

May 1 09:21:32 ferengi /kernel: st0(ahc0:1:0): SCB 0x2 - timed out while
idle, LASTPHASE == 0x1, SCSISIGI == 0x0
May  1 09:21:32 ferengi /kernel: SEQADDR == 0x8

May 1 09:21:32 ferengi /kernel: st0(ahc0:1:0): SCB 2: Immediate reset. 
Flags = 0x401
May  1 09:21:32 ferengi /kernel: st0(ahc0:1:0): no longer in timeout
May  1 09:21:32 ferengi /kernel: ahc0: Issued Channel A Bus Reset. 1 SCBs 
aborted
May  1 09:21:32 ferengi /kernel: Clearing bus reset
May  1 09:21:32 ferengi /kernel: Clearing 'in-reset' flag
May  1 09:21:32 ferengi /kernel: sd0(ahc0:0:0): UNIT ATTENTION asc:29,2
May  1 09:21:32 ferengi /kernel: , retries:4

We're using an adaptec 2940UW and a Seagate 4mm dat.  We pulled the
hard drive and put it into another machine with identical hardware and
experienced the same failures.  Is the the infamous 2940UW driver bug?  

Also, these sudden failure seemed to coincide with a sudden increase in 
the data on the drive.  Would a full tape cause this error?  

This is all somewhat confusing because we have another server with the
same hardware and even more data and it backs up to tape every day just
fine.  The only difference is that one runs 2.2 and the failing one runs
2.2.1

Any ideas?




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