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

    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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