Adaptec 2944 with aic7xxx(6.2.1) and Linux-2.4.7 gives intermittent Unexpected busfree in Data-in phase

[Chris Ritson]

<posted & mailed>

I am using Redhat 7.1 with kernel 2.4.7-SMP and the aic7xxx driver
(version 6.2.1) to drive a Dell Powervault 120T autochanger with
an Adaptec 2944. Using amanda to do our backups, we seem to
get two or three evening's backup runs without problems, then
the amverify read-back starts failing about half way down the
tape with this type of error. The only solution appears to be a
reboot. As this machine is also our main file server, I would dearly
like to find a cure to this. Any pointers as to what to look for would
be most welcome.

Aug 21 03:31:43 byerhope kernel: (scsi0:A:3:0): Unexpected busfree in Data-in 
phase
Aug 21 03:31:43 byerhope kernel: SEQADDR == 0x6c
Aug 21 03:31:43 byerhope kernel: st0: Error 70000 (sugg. bt 0x0, driver bt 
0x0, host bt 0x7).
Aug 21 03:31:43 byerhope kernel: st0: Error 10000 (sugg. bt 0x0, driver bt 
0x0, host bt 0x1).
Aug 21 03:31:50 byerhope last message repeated 13 times

If it helps, here are the boot-time messages from the hardware:

Aug 22 21:37:45 byerhope kernel: SCSI subsystem driver Revision: 1.00
Aug 22 21:37:45 byerhope kernel: scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA 
DRIVER, Rev 6.2.1
Aug 22 21:37:45 byerhope kernel:         <Adaptec 2944 Ultra SCSI adapter>
Aug 22 21:37:45 byerhope kernel:         aic7880: Ultra Wide Channel A, SCSI 
Id=7, 16/255 SCBs

Aug 22 21:37:45 byerhope kernel:   Vendor: ADIC      Model: FastStor DLT      
Rev: D116
Aug 22 21:37:45 byerhope kernel:   Type:   Medium Changer                     
ANSI SCSI revision: 02
Aug 22 21:37:45 byerhope kernel:   Vendor: QUANTUM   Model: DLT7000           
Rev: 2561
Aug 22 21:37:46 byerhope kernel:   Type:   Sequential-Access                  
ANSI SCSI revision: 02

I will post a followup. Thanks in advance.

Chris Ritson.
-- 
EMAIL: C.R.Ritson at newcastle.ac.uk      Chris Ritson, Rm 618, Claremont Bridge,
PHONE: +44 191 222 8175                Department of Computing Science,
FAX  : +44 191 222 8232                University of Newcastle upon Tyne,
http://www.cs.ncl.ac.uk/~c.r.ritson/   Newcastle on Tyne, UK NE1 7RU.

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