Unexpected busfree in Data-in phase , 2.4.18-ac3+smp+raid0+aic-7880U+ext3

[Dimitris Zilaskos]

 I have a raid0 array with 3* 9 gb ultra wide scsi disks , 2 Quantum
Viking 2 and and 1 IBM DNES . The controller is aic7880U on-board on a
dual p2 266 system . Today I found the system unable to access data on the
raid array and the following in the logs :

Jun 24 15:23:23 foo kernel: (scsi0:A:2:0): Unexpected busfree in
Data-in phase
Jun 24 15:23:23 foo kernel: SEQADDR == 0x7d
Jun 24 15:23:23 foo kernel: SCSI disk error : host 0 channel 0 id 2
lun 0 return code = 10000
Jun 24 15:23:23 foo kernel:  I/O error: dev 08:11, sector 1269344
Jun 24 15:23:23 foo kernel: Device 08:11 not ready.
Jun 24 15:23:23 foo kernel:  I/O error: dev 08:11, sector 1269344
Jun 24 15:23:26 foo kernel: Device 08:11 not ready.
Jun 24 15:23:26 foo kernel:  I/O error: dev 08:11, sector 1291968
Jun 24 15:23:26 foo kernel: Device 08:11 not ready.
Jun 24 15:23:26 foo kernel:  I/O error: dev 08:11, sector 1291968
Jun 24 15:23:26 foo kernel: Device 08:11 not ready.
Jun 24 15:23:26 foo kernel:  I/O error: dev 08:11, sector 4464
Jun 24 15:23:27 foo kernel: Device 08:11 not ready.
Jun 24 15:23:27 foo kernel:  I/O error: dev 08:11, sector 1292416

and those messages go on for hours . Apart from that , the system works ok
. A reboot followed by an fsck results in a system working ok , with no
data loss . Extensive read/write operations ( copying of big files /many
small ones ) seem to work ok . The message has not reappeared as yet .
    The errors occured after roughly 7 days of uptime , during which
there has been continuous read operation from the array , from 200
kbytes/sec to 1 Mbyte/sec ( the system is a busy ftp server )

this the output of /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 01 Lun: 00
  Vendor: QUANTUM  Model: VIKING II 9.1WLS Rev: 5520
  Type:   Direct-Access                    ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 02 Lun: 00
  Vendor: IBM      Model: DNES-309170W     Rev: SA30
  Type:   Direct-Access                    ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 04 Lun: 00
  Vendor: QUANTUM  Model: VIKING II 9.1WLS Rev: 5520
  Type:   Direct-Access                    ANSI SCSI revision: 02

  Any advice is welcomed .

 Regards ,
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Dimitris Zilaskos

Department of Physics @ Aristotle Univercity of Thessaloniki , Greece
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