I'm having a frustrating time trying to work out why our Dell PV124T (LTO4
autoloader with a Quantum drive) is not working well at present.

Kernel 2.6.33-2-amd64 on Debian
Bacula 5.0.2-1~bpo50 (customised)

The latest in a set of failures (can't write to tapes, can read reliably
off tapes) is as follows (from my kernel log):

    [ 2517.323423] INFO: task bacula-sd:21475 blocked for more than 120 seconds.
    [ 2517.323477] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
    [ 2517.323559] bacula-sd     D 0000000000000000     0 21475      1 
0x00000000
    [ 2517.323562]  ffffffff8163e020 0000000000000086 0000000000000000 
0000000000000fe0
    [ 2517.323566]  ffff8803399e24d0 000000000000f8e0 ffff88032a8bdfd8 
0000000000015680
    [ 2517.323569]  0000000000015680 ffff88009d5f8000 ffff88009d5f82f0 
0000000039974000
    [ 2517.323572] Call Trace:
    [ 2517.323586]  [<ffffffffa0016809>] ? scsi_init_sgtable+0x3f/0x5a 
[scsi_mod]
    [ 2517.323590]  [<ffffffff812ed4cb>] ? schedule_timeout+0x2e/0xdd
    [ 2517.323593]  [<ffffffff81171918>] ? blk_peek_request+0x18b/0x19f
    [ 2517.323596]  [<ffffffff812ed366>] ? wait_for_common+0xde/0x15b
    [ 2517.323599]  [<ffffffff81042cc2>] ? default_wake_function+0x0/0x9
    [ 2517.323603]  [<ffffffffa01d609e>] ? st_do_scsi+0x2c4/0x2f4 [st]
    [ 2517.323607]  [<ffffffffa01d9642>] ? st_read+0x396/0x8f4 [st]
    [ 2517.323610]  [<ffffffff812ee88e>] ? common_interrupt+0xe/0x13
    [ 2517.323613]  [<ffffffff81040d61>] ? finish_task_switch+0x3a/0xa7
    [ 2517.323618]  [<ffffffff810ea675>] ? vfs_read+0xa6/0xff
    [ 2517.323620]  [<ffffffff810ea78a>] ? sys_read+0x45/0x6e
    [ 2517.323624]  [<ffffffff81008ac2>] ? system_call_fastpath+0x16/0x1b
    [ 2981.275435] st0: Error 50000 (driver bt 0x0, host bt 0x5).
    [ 2981.278175] st0: Sense Key : Aborted Command [current]
    [ 2981.278180] st0: Add. Sense: Tagged overlapped commands (task tag 0)
    [ 3880.828005] st0: Error 50000 (driver bt 0x0, host bt 0x5).

Can anyone tell me what this means, apart from "your restore job just failed"?

Many thanks
Rory

-- 
Rory Campbell-Lange
rory AT campbell-lange DOT net

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