Failed drive in raid6 while doing data-check

[Krzysztof Adamski <k@xxxxxxxxxxx>]

The monthly data check found a bad drive in my raid6 array. This is what
started to show up in the log:
Jun  3 12:02:53 rogen kernel: [9908355.355940] sd 2:0:1:0: attempting task abort! scmd(ffff8801547c6a00)
Jun  3 12:02:53 rogen kernel: [9908355.355953] sd 2:0:1:0: [sdb] CDB: Read(10): 28 00 e4 5c ed 38 00 00 08 00
Jun  3 12:02:53 rogen kernel: [9908355.355983] scsi target2:0:1: handle(0x0009), sas_address(0x4433221100000000), phy(0)
Jun  3 12:02:53 rogen kernel: [9908355.355992] scsi target2:0:1: enclosure_logical_id(0x500605b003f7aa10), slot(3)
Jun  3 12:02:56 rogen kernel: [9908359.141194] sd 2:0:1:0: task abort: SUCCESS scmd(ffff8801547c6a00)
Jun  3 12:02:56 rogen kernel: [9908359.141206] sd 2:0:1:0: attempting task abort! scmd(ffff8803aea45400)
Jun  3 12:02:56 rogen kernel: [9908359.141216] sd 2:0:1:0: [sdb] CDB: Read(10): 28 00 e4 5c ed 40 00 00 08 00

But now it has changed to this:
Jun  3 12:04:44 rogen kernel: [9908466.716281] sd 2:0:1:0: [sdb] Unhandled error code
Jun  3 12:04:44 rogen kernel: [9908466.716287] sd 2:0:1:0: [sdb]  Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
Jun  3 12:04:44 rogen kernel: [9908466.716296] sd 2:0:1:0: [sdb] CDB: Read(10): 28 00 e4 5c ee 38 00 00 08 00
Jun  3 12:04:44 rogen kernel: [9908466.716319] end_request: I/O error, dev sdb, sector 3831295544
Jun  3 12:04:44 rogen kernel: [9908466.716616] sd 2:0:1:0: [sdb]  Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
Jun  3 12:04:44 rogen kernel: [9908466.717200] mpt2sas0: removing handle(0x0009), sas_addr(0x4433221100000000)
Jun  3 12:04:44 rogen kernel: [9908466.917090] md/raid:md7: Disk failure on sdb2, disabling device.
Jun  3 12:04:44 rogen kernel: [9908466.917091] md/raid:md7: Operation continuing on 11 devices.
Jun  3 12:07:41 rogen kernel: [9908643.882541] INFO: task md7_resync:28497 blocked for more than 120 seconds.
Jun  3 12:07:41 rogen kernel: [9908643.882552] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jun  3 12:07:41 rogen kernel: [9908643.882556] md7_resync      D ffff8800b508aa20     0 28497      2 0x00000000
Jun  3 12:07:41 rogen kernel: [9908643.882560]  ffff8802ab877b80 0000000000000046 ffff8803ffbfa340 0000000000000046
Jun  3 12:07:41 rogen kernel: [9908643.882564]  ffff8802ab876010 ffff8800b508a6a0 00000000001d29c0 ffff8802ab877fd8
Jun  3 12:07:41 rogen kernel: [9908643.882566]  ffff8802ab877fd8 00000000001d29c0 ffff880070448000 ffff8800b508a6a0
Jun  3 12:07:41 rogen kernel: [9908643.882569] Call Trace:
Jun  3 12:07:41 rogen kernel: [9908643.882577]  [<ffffffff81339704>] schedule+0x55/0x57
Jun  3 12:07:41 rogen kernel: [9908643.882599]  [<ffffffffa01da26b>] bitmap_cond_end_sync+0xbc/0x152 [md_mod]
Jun  3 12:07:41 rogen kernel: [9908643.882602]  [<ffffffff8106190d>] ? wake_up_bit+0x25/0x25
Jun  3 12:07:41 rogen kernel: [9908643.882607]  [<ffffffffa022f7a7>] sync_request+0x22e/0x2ef [raid456]
Jun  3 12:07:41 rogen kernel: [9908643.882613]  [<ffffffffa01d1ebc>] ? is_mddev_idle+0x106/0x118 [md_mod]
Jun  3 12:07:41 rogen kernel: [9908643.882618]  [<ffffffffa01d2689>] md_do_sync+0x7bb/0xbce [md_mod]
Jun  3 12:07:41 rogen kernel: [9908643.882624]  [<ffffffffa01d2cbe>] md_thread+0xff/0x11d [md_mod]
Jun  3 12:07:41 rogen kernel: [9908643.882629]  [<ffffffffa01d2bbf>] ? md_rdev_init+0x8d/0x8d [md_mod]
Jun  3 12:07:41 rogen kernel: [9908643.882631]  [<ffffffff81061499>] kthread+0x9b/0xa3
Jun  3 12:07:41 rogen kernel: [9908643.882634]  [<ffffffff81342ca4>] kernel_thread_helper+0x4/0x10
Jun  3 12:07:41 rogen kernel: [9908643.882637]  [<ffffffff810613fe>] ? __init_kthread_worker+0x56/0x56
Jun  3 12:07:41 rogen kernel: [9908643.882639]  [<ffffffff81342ca0>] ? gs_change+0x13/0x13
Jun  3 12:07:41 rogen kernel: [9908643.882641] INFO: lockdep is turned off.

The cat /proc/mdstat is:
Personalities : [raid1] [raid6] [raid5] [raid4]
md7 : active raid6 sdd2[0] sdab2[11] sdaa2[10] sdz2[9] sdy2[8] sde2[7] sdh2[6] sdf2[5] sdg2[4] sdb2[3](F) sdc2[2] sda2[1]
      29283121600 blocks super 1.2 level 6, 32k chunk, algorithm 2 [12/11] [UUU_UUUUUUUU]
      [=============>.......]  check = 65.3% (1913765076/2928312160) finish=44345.9min speed=381K/sec
      bitmap: 1/22 pages [4KB], 65536KB chunk

I don't really want to wait 30 days for this to finish, what is correct
thing to do before I replace the failed drive?

Thanks in advance,
K

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