In general "Unexpected busfree" indicates bad cabling or termination.
On Mon, 2002-06-24 at 14:38, Dimitris Zilaskos wrote:
>
> 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 ,
> --
> =============================================================================
>
> Dimitris Zilaskos
>
> Department of Physics @ Aristotle Univercity of Thessaloniki , Greece
> =============================================================================
>
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