Tejas,

You are probably running firmware AR13 or older. The drives are designed 
for very power efficient archive use and they have a very aggressive 
spin down timer. Once they drop to a slower speed or stopped it will 
take a significant time to get back up to ready. I would highly suggest 
updating to code AR14 or AR15.

The drives aren't really intended for your use model. Perhaps a cron job 
that does a dd read (direct mode) of a hundred MBs or so from the md 
device to dev/null every couple minutes might be enough to keep them 
warm and not spun down.

--Jeff


On 8/14/15 10:52 AM, Tejas Rao wrote:

I am aware that the Seagate SMR 8tb archive drives are not meant to be 
used in a RAID environment as they lack TLER/ERC support.

We are trying to use these drives with mdraid and are seeing problems. 
It seems that after writing to these drives for few hours, 
occasionally some drives stop responding for few minutes and recover 
on its own later. (This was expected).

I have increased the device timeouts to 480 seconds now 
(sys/block/<device>/device/timeout). The md device is assembled on top 
of dm-multipath devices and dm-multipath is configured to retry 50 
times (no_path_retry=50). I have also changed queue_depth for each 
device to 1 (NCQ disabled).

Usually when I see retries and a drive stops responding, it recovers 
on its own after few minutes and the md layer does not fail the disk. 
Occasionally though, the md layer fails the disk after ~15 seconds or 
so of the drive becoming non-responsive. See below.

sdlm and sdfb are the same disk (mpathaw, dm-231,dm-226). Why does the 
md layer not wait for 480 seconds before failing the disk. As you can 
see the drive recovered after ~ 8 minutes but the md layer failed it 
after ~15 seconds.

What other tunables can I tune to avoid kicking a drive out early.

Aug 14 13:01:12 dc045 kernel: mpt2sas3: log_info(0x31120303): 
originator(PL), code(0x12), sub_code(0x0303)
Aug 14 13:01:12 dc045 kernel: mpt2sas3: 
_scsih_sas_broadcast_primitive_event: enter: phy number(7), width(8)
Aug 14 13:01:12 dc045 kernel: mpt2sas1: 
_scsih_sas_broadcast_primitive_event: enter: phy number(7), width(8)
Aug 14 13:05:24 dc045 kernel: mpt2sas3: log_info(0x31120303): 
originator(PL), code(0x12), sub_code(0x0303)
Aug 14 13:05:24 dc045 kernel: mpt2sas3: 
_scsih_sas_broadcast_primitive_event: enter: phy number(7), width(8)
Aug 14 13:05:24 dc045 kernel: mpt2sas1: 
_scsih_sas_broadcast_primitive_event: enter: phy number(7), width(8)
Aug 14 13:12:19 dc045 kernel: mpt2sas3: log_info(0x31120303): 
originator(PL), code(0x12), sub_code(0x0303)
Aug 14 13:12:19 dc045 kernel: mpt2sas3: 
_scsih_sas_broadcast_primitive_event: enter: phy number(7), width(8)
Aug 14 13:12:19 dc045 kernel: mpt2sas1: 
_scsih_sas_broadcast_primitive_event: enter: phy number(7), width(8)
Aug 14 13:12:35 dc045 kernel: __ratelimit: 2 callbacks suppressed
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Unhandled sense code
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Result: 
hostbyte=DID_OK driverbyte=DRIVER_SENSE
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Sense Key : 
Hardware Error [current]
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] <<vendor>> ASC=0x81 
ASCQ=0x0ASC=0x81 ASCQ=0x0
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] CDB: Write(10): 2a 
00 55 6a 5e c8 00 00 b8 00
Aug 14 13:12:35 dc045 kernel: __ratelimit: 14 callbacks suppressed
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] Unhandled sense code
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] Result: 
hostbyte=DID_OK driverbyte=DRIVER_SENSE
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] Sense Key : 
Hardware Error [current]
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] <<vendor>> ASC=0x81 
ASCQ=0x0ASC=0x81 ASCQ=0x0
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] CDB: Write(10): 2a 
00 55 6a 5f 80 00 00 10 00
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Unhandled sense code
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Result: 
hostbyte=DID_OK driverbyte=DRIVER_SENSE
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Sense Key : 
Hardware Error [current]
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] <<vendor>> ASC=0x81 
ASCQ=0x0ASC=0x81 ASCQ=0x0
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] CDB: Write(10): 2a 
00 55 6a 5f 90 00 03 38 00
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] Unhandled sense code
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] Result: 
hostbyte=DID_OK driverbyte=DRIVER_SENSE
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] Sense Key : 
Hardware Error [current]
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] <<vendor>> ASC=0x81 
ASCQ=0x0ASC=0x81 ASCQ=0x0
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] CDB: Read(16): 88 
00 00 00 00 01 d5 59 50 a8 00 00 00 08 00 00
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Unhandled sense code
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Result: 
hostbyte=DID_OK driverbyte=DRIVER_SENSE
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Sense Key : 
Hardware Error [current]
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] <<vendor>> ASC=0x81 
ASCQ=0x0ASC=0x81 ASCQ=0x0
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] CDB: Read(16): 88 
00 00 00 00 01 d5 59 50 b0 00 00 00 80 00 00
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] Unhandled sense code
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] Result: 
hostbyte=DID_OK driverbyte=DRIVER_SENSE
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] Sense Key : 
Hardware Error [current]
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] <<vendor>> ASC=0x81 
ASCQ=0x0ASC=0x81 ASCQ=0x0
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] CDB: Read(10): 28 
00 55 6a 78 00 00 00 50 00
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
dm-226, sector 7874367664
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
dm-226, sector 1433040896
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] Unhandled sense code
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] Result: 
hostbyte=DID_OK driverbyte=DRIVER_SENSE
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] Sense Key : 
Hardware Error [current]
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] <<vendor>> ASC=0x81 
ASCQ=0x0ASC=0x81 ASCQ=0x0
Aug 14 13:12:35 dc045 kernel: sd 25:0:42:0: [sdfb] CDB: Write(10): 2a 
00 00 00 08 08 00 00 01 00
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
sdfb, sector 2056
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Unhandled sense code
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Result: 
hostbyte=DID_OK driverbyte=DRIVER_SENSE
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Sense Key : 
Hardware Error [current]
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] <<vendor>> ASC=0x81 
ASCQ=0x0ASC=0x81 ASCQ=0x0
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] CDB: Read(10): 28 
00 55 6a 7b e0 00 00 20 00
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
sdlm, sector 1433041888
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
dm-226, sector 1433041888
Aug 14 13:12:35 dc045 kernel: mpt2sas1: 
_scsih_sas_broadcast_primitive_event: enter: phy number(7), width(8)
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Unhandled sense code
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Result: 
hostbyte=DID_OK driverbyte=DRIVER_SENSE
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Sense Key : 
Hardware Error [current]
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] <<vendor>> ASC=0x81 
ASCQ=0x0ASC=0x81 ASCQ=0x0
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] CDB: Read(10): 28 
00 00 00 00 00 00 00 08 00
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
sdlm, sector 0
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
dm-226, sector 2056
Aug 14 13:12:35 dc045 kernel: md: super_written gets error=-121, 
uptodate=0
Aug 14 13:12:35 dc045 kernel: md/raid:md8: Disk failure on dm-231, 
disabling device.
Aug 14 13:12:35 dc045 kernel: md/raid:md8: Operation continuing on 13 
devices.
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Unhandled sense code
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Result: 
hostbyte=DID_OK driverbyte=DRIVER_SENSE
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] Sense Key : 
Hardware Error [current]
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] <<vendor>> ASC=0x81 
ASCQ=0x0ASC=0x81 ASCQ=0x0
Aug 14 13:12:35 dc045 kernel: sd 27:0:42:0: [sdlm] CDB: Write(10): 2a 
00 55 6a 62 c8 00 04 00 00
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
sdlm, sector 1433035464
Aug 14 13:12:35 dc045 kernel: mpt2sas3: 
_scsih_sas_broadcast_primitive_event: enter: phy number(7), width(8)
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
dm-226, sector 1433035464
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
sdfb, sector 1433036488
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
dm-226, sector 1433036488
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
sdlm, sector 1433037512
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
dm-226, sector 1433037512
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
sdfb, sector 2128
Aug 14 13:12:35 dc045 kernel: end_request: critical target error, dev 
dm-226, sector 2128
Aug 14 13:12:35 dc045 kernel: md: super_written gets error=-121, 
uptodate=0
Aug 14 13:12:36 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:12:36 dc045 multipathd: checker failed path 68:320 in map 
mpathaw
Aug 14 13:12:36 dc045 multipathd: mpathaw: remaining active paths: 1
Aug 14 13:12:36 dc045 kernel: device-mapper: multipath: Failing path 
68:320.
Aug 14 13:13:17 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:13:25 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:13:25 dc045 multipathd: checker failed path 129:208 in map 
mpathaw
Aug 14 13:13:25 dc045 multipathd: mpathaw: Entering recovery mode: 
max_retries=50
Aug 14 13:13:25 dc045 multipathd: mpathaw: remaining active paths: 0
Aug 14 13:13:25 dc045 kernel: device-mapper: multipath: Failing path 
129:208.
Aug 14 13:13:25 dc045 multipathd: mpathaw: Entering recovery mode: 
max_retries=50
Aug 14 13:13:27 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:13:35 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:13:37 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:13:45 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:13:47 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:13:55 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:13:57 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:14:05 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:14:07 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:14:15 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:14:17 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:14:25 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:14:27 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:14:35 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:14:37 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:14:46 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:14:48 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:14:56 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:14:58 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:15:06 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:15:08 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:15:16 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:15:18 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:15:26 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:15:28 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:15:36 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:15:38 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:15:46 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:15:48 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:15:56 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:15:58 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:16:06 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:16:08 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:16:16 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:16:18 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:16:26 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:16:28 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:16:37 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:16:39 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:16:47 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:16:49 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:16:57 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:16:59 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:17:07 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:17:09 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:17:17 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:17:19 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:17:27 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:17:29 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:17:37 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:17:39 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:17:47 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:17:49 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:17:57 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:17:59 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:18:07 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:18:09 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:18:17 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:18:19 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:18:28 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:18:30 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:18:38 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:18:40 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:18:48 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:18:50 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:18:58 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:19:00 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:19:08 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:19:10 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:19:18 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:19:20 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:19:28 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:19:30 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:19:38 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:19:40 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:19:48 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:19:50 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:19:58 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:20:00 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:20:08 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:20:11 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:20:19 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:20:21 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:20:29 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is down
Aug 14 13:20:31 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is down
Aug 14 13:20:37 dc045 kernel: sd 25:0:42:0: attempting task abort! 
scmd(ffff881c6e49aec0)
Aug 14 13:20:37 dc045 kernel: sd 25:0:42:0: [sdfb] CDB: Write(10): 2a 
00 55 6a 72 c8 00 01 68 00
Aug 14 13:20:37 dc045 kernel: scsi target25:0:42: handle(0x0037), 
sas_address(0x5000c5007b2ee20d), phy(18)
Aug 14 13:20:37 dc045 kernel: scsi target25:0:42: 
enclosure_logical_id(0x500093d00104c000), slot(39)
Aug 14 13:20:37 dc045 kernel: sd 27:0:42:0: attempting task abort! 
scmd(ffff880c35fba7c0)
Aug 14 13:20:37 dc045 kernel: sd 27:0:42:0: [sdlm] CDB: Write(10): 2a 
00 55 6a 6e c8 00 04 00 00
Aug 14 13:20:37 dc045 kernel: scsi target27:0:42: handle(0x0037), 
sas_address(0x5000c5007b2ee20e), phy(18)
Aug 14 13:20:37 dc045 kernel: scsi target27:0:42: 
enclosure_logical_id(0x500093d00104c000), slot(39)
Aug 14 13:20:37 dc045 kernel: sd 25:0:42:0: task abort: SUCCESS 
scmd(ffff881c6e49aec0)
Aug 14 13:20:37 dc045 kernel: sd 27:0:42:0: task abort: SUCCESS 
scmd(ffff880c35fba7c0)
Aug 14 13:20:37 dc045 kernel: mpt2sas3: 
_scsih_sas_broadcast_primitive_event: enter: phy number(7), width(8)
Aug 14 13:20:37 dc045 kernel: mpt2sas1: 
_scsih_sas_broadcast_primitive_event: enter: phy number(5), width(8)
Aug 14 13:20:39 dc045 multipathd: mpathaw: sdfb - directio checker 
reports path is up
Aug 14 13:20:39 dc045 multipathd: 129:208: reinstated
Aug 14 13:20:39 dc045 multipathd: mpathaw: queue_if_no_path enabled
Aug 14 13:20:39 dc045 multipathd: mpathaw: Recovered to normal mode
Aug 14 13:20:39 dc045 multipathd: mpathaw: remaining active paths: 1
Aug 14 13:20:41 dc045 multipathd: mpathaw: sdlm - directio checker 
reports path is up
Aug 14 13:20:41 dc045 multipathd: 68:320: reinstated
Aug 14 13:20:41 dc045 multipathd: mpathaw: remaining active paths: 2
Aug 14 13:21:12 dc045 kernel: md: unbind<dm-231>
Aug 14 13:21:12 dc045 kernel: md: export_rdev(dm-231)







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------------------------------
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High-performance Computing / Lustre Filesystems / Scale-out Storage