[Bug 1032550] Re: [multipath] failed to get sysfs information
Ronald Moesbergen
intercommit at gmail.com
Fri Dec 21 10:36:04 UTC 2012
Peter,
I got it to crash again, this time with a nice kernel dump. The dump can
be fetched here:
http://www.rmoesbergen.nl/linux-image-3.2.0-34-generic.0.crash.gz
The crash itself looked like this:
Dec 21 11:07:32 ealxs00161 kernel: [63272.392812] sd 4:0:1:1: emc: ALUA failover mode detected
Dec 21 11:07:32 ealxs00161 kernel: [63272.392820] sd 4:0:1:1: emc: at SP B Port 1 (owned, default SP B)
Dec 21 11:07:32 ealxs00161 kernel: [63272.393180] sd 3:0:0:1: emc: ALUA failover mode detected
Dec 21 11:07:32 ealxs00161 kernel: [63272.393187] sd 3:0:0:1: emc: at SP B Port 0 (owned, default SP B)
Dec 21 11:10:36 ealxs00161 kernel: [63455.641431] qla2xxx [0000:07:00.0]-500b:3: LOOP DOWN detected (2 3 0 0).
Dec 21 11:10:52 ealxs00161 multipathd: sdf: remove path (uevent)
Dec 21 11:10:52 ealxs00161 kernel: [63471.548255] rport-3:0-1: blocked FC remote port time out: removing target and saving binding
Dec 21 11:10:52 ealxs00161 kernel: [63471.676065] rport-3:0-0: blocked FC remote port time out: removing target and saving binding
Dec 21 11:11:08 ealxs00161 cimserver[2079]: Authentication failed for user=root.
Dec 21 11:11:10 ealxs00161 cimserver[2079]: Authentication failed for user=root.
Dec 21 11:13:28 ealxs00161 kernel: [63627.745648] INFO: task jbd2/dm-1-8:1530 blocked for more than 120 seconds.
Dec 21 11:13:28 ealxs00161 kernel: [63627.746025] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec 21 11:13:28 ealxs00161 kernel: [63627.756371] jbd2/dm-1-8 D ffff8803aa11a620 0 1530 2 0x00000000
Dec 21 11:13:28 ealxs00161 kernel: [63627.756380] ffff880416141ac0 0000000000000046 ffff880416141a60 ffff88042ee137c0
Dec 21 11:13:28 ealxs00161 kernel: [63627.756388] ffff880416141fd8 ffff880416141fd8 ffff880416141fd8 00000000000137c0
Dec 21 11:13:28 ealxs00161 kernel: [63627.756395] ffffffff81c0d020 ffff880415ef9700 ffff880416141a90 ffff88042ee14080
Dec 21 11:13:28 ealxs00161 kernel: [63627.756403] Call Trace:
Dec 21 11:13:28 ealxs00161 kernel: [63627.756416] [<ffffffff81117230>] ? __lock_page+0x70/0x70
Dec 21 11:13:28 ealxs00161 kernel: [63627.756431] [<ffffffff81659ebf>] schedule+0x3f/0x60
Dec 21 11:13:28 ealxs00161 kernel: [63627.756441] [<ffffffff81659f6f>] io_schedule+0x8f/0xd0
Dec 21 11:13:28 ealxs00161 kernel: [63627.756451] [<ffffffff8111723e>] sleep_on_page+0xe/0x20
Dec 21 11:13:28 ealxs00161 kernel: [63627.756460] [<ffffffff8165a78f>] __wait_on_bit+0x5f/0x90
Dec 21 11:13:28 ealxs00161 kernel: [63627.756470] [<ffffffff811173a8>] wait_on_page_bit+0x78/0x80
Dec 21 11:13:28 ealxs00161 kernel: [63627.756481] [<ffffffff8108ad60>] ? autoremove_wake_function+0x40/0x40
Dec 21 11:13:28 ealxs00161 kernel: [63627.756492] [<ffffffff811174bc>] filemap_fdatawait_range+0x10c/0x1a0
Dec 21 11:13:28 ealxs00161 kernel: [63627.756503] [<ffffffff8111757b>] filemap_fdatawait+0x2b/0x30
Dec 21 11:13:28 ealxs00161 kernel: [63627.756516] [<ffffffff81260ea0>] journal_finish_inode_data_buffers+0x70/0x170
Dec 21 11:13:28 ealxs00161 kernel: [63627.756528] [<ffffffff81261795>] jbd2_journal_commit_transaction+0x665/0x1240
Dec 21 11:13:28 ealxs00161 kernel: [63627.756538] [<ffffffff8108ad20>] ? add_wait_queue+0x60/0x60
Dec 21 11:13:28 ealxs00161 kernel: [63627.756548] [<ffffffff8126603b>] kjournald2+0xbb/0x220
Dec 21 11:13:28 ealxs00161 kernel: [63627.756557] [<ffffffff8108ad20>] ? add_wait_queue+0x60/0x60
Dec 21 11:13:28 ealxs00161 kernel: [63627.756566] [<ffffffff81265f80>] ? commit_timeout+0x10/0x10
Dec 21 11:13:28 ealxs00161 kernel: [63627.756575] [<ffffffff8108a27c>] kthread+0x8c/0xa0
Dec 21 11:13:28 ealxs00161 kernel: [63627.756587] [<ffffffff81666534>] kernel_thread_helper+0x4/0x10
Dec 21 11:13:28 ealxs00161 kernel: [63627.756596] [<ffffffff8108a1f0>] ? flush_kthread_worker+0xa0/0xa0
Dec 21 11:13:28 ealxs00161 kernel: [63627.756606] [<ffffffff81666530>] ? gs_change+0x13/0x13
Dec 21 11:13:28 ealxs00161 kernel: [63627.756612] Kernel panic - not syncing: hung_task: blocked tasks
Dec 21 11:13:28 ealxs00161 kernel: [63627.768425] Pid: 66, comm: khungtaskd Tainted: G W 3.2.0-34-generic #53-Ubuntu
Dec 21 11:13:28 ealxs00161 kernel: [63627.779691] Call Trace:
Dec 21 11:13:28 ealxs00161 kernel: [63627.790147] [<ffffffff81643128>] panic+0x91/0x1a4
Dec 21 11:13:28 ealxs00161 kernel: [63627.800888] [<ffffffff810d78f2>] check_hung_task+0xb2/0xc0
Dec 21 11:13:28 ealxs00161 kernel: [63627.811370] [<ffffffff810d7a1b>] check_hung_uninterruptible_tasks+0x11b/0x140
Dec 21 11:13:28 ealxs00161 kernel: [63627.821998] [<ffffffff810d7a40>] ? check_hung_uninterruptible_tasks+0x140/0x140
Dec 21 11:13:28 ealxs00161 kernel: [63627.833715] [<ffffffff810d7a8f>] watchdog+0x4f/0x60
Dec 21 11:13:28 ealxs00161 kernel: [63627.844538] [<ffffffff8108a27c>] kthread+0x8c/0xa0
Dec 21 11:13:28 ealxs00161 kernel: [63627.855370] [<ffffffff81666534>] kernel_thread_helper+0x4/0x10
Dec 21 11:13:28 ealxs00161 kernel: [63627.866367] [<ffffffff8108a1f0>] ? flush_kthread_worker+0xa0/0xa0
Dec 21 11:13:28 ealxs00161 kernel: [63627.877343] [<ffffffff81666530>] ? gs_change+0x13/0x13
output of ps xa, just before the crash:
PID TTY STAT TIME COMMAND
1 ? Ss 0:02 /sbin/init
2 ? S 0:00 [kthreadd]
3 ? S 0:01 [ksoftirqd/0]
6 ? S 0:01 [migration/0]
7 ? S 0:00 [watchdog/0]
8 ? S 0:00 [migration/1]
10 ? S 0:00 [ksoftirqd/1]
12 ? S 0:00 [watchdog/1]
13 ? S 0:01 [migration/2]
15 ? S 0:00 [ksoftirqd/2]
16 ? S 0:00 [watchdog/2]
17 ? S 0:00 [migration/3]
19 ? S 0:00 [ksoftirqd/3]
20 ? S 0:00 [watchdog/3]
21 ? S 0:00 [migration/4]
23 ? S 0:00 [ksoftirqd/4]
24 ? S 0:00 [watchdog/4]
25 ? S 0:00 [migration/5]
27 ? S 0:00 [ksoftirqd/5]
28 ? S 0:00 [watchdog/5]
29 ? S 0:00 [migration/6]
30 ? S 0:00 [kworker/6:0]
31 ? S 0:00 [ksoftirqd/6]
32 ? S 0:00 [watchdog/6]
33 ? S 0:00 [migration/7]
35 ? S 0:00 [ksoftirqd/7]
36 ? S 0:00 [watchdog/7]
37 ? S 0:00 [migration/8]
38 ? S 0:00 [kworker/8:0]
39 ? S 0:00 [ksoftirqd/8]
40 ? S 0:00 [watchdog/8]
41 ? S 0:00 [migration/9]
42 ? S 0:00 [kworker/9:0]
43 ? S 0:00 [ksoftirqd/9]
44 ? S 0:00 [watchdog/9]
45 ? S 0:00 [migration/10]
47 ? S 0:00 [ksoftirqd/10]
48 ? S 0:00 [watchdog/10]
49 ? S 0:00 [migration/11]
51 ? S 0:00 [ksoftirqd/11]
52 ? S 0:00 [watchdog/11]
53 ? S< 0:00 [cpuset]
54 ? S< 0:00 [khelper]
55 ? S 0:00 [kdevtmpfs]
56 ? S< 0:00 [netns]
58 ? S 0:00 [sync_supers]
59 ? S 0:00 [bdi-default]
60 ? S< 0:00 [kintegrityd]
61 ? S< 0:00 [kblockd]
62 ? S< 0:00 [ata_sff]
63 ? S 0:00 [khubd]
64 ? S< 0:00 [md]
66 ? S 0:00 [khungtaskd]
67 ? S 0:14 [kswapd0]
68 ? SN 0:00 [ksmd]
69 ? SN 0:00 [khugepaged]
70 ? S 0:00 [fsnotify_mark]
71 ? S 0:00 [ecryptfs-kthrea]
72 ? S< 0:00 [crypto]
80 ? S< 0:00 [kthrotld]
81 ? S 0:00 [scsi_eh_0]
82 ? S 0:00 [scsi_eh_1]
104 ? S< 0:00 [devfreq_wq]
265 ? S 0:00 [scsi_eh_2]
267 ? S 0:00 [hpsa]
349 ? S 0:00 [kworker/6:1]
352 ? S 0:00 [kworker/9:1]
353 ? S 0:00 [kworker/10:1]
354 ? S 0:00 [kworker/4:1]
357 ? S< 0:00 [kdmflush]
365 ? S 0:00 [jbd2/sda1-8]
366 ? S< 0:00 [ext4-dio-unwrit]
458 ? S 0:00 upstart-udev-bridge --daemon
461 ? Ss 0:00 /sbin/udevd --daemon
547 ? S< 0:00 [kmpathd]
548 ? S< 0:00 [kmpath_handlerd]
626 ? S< 0:00 [edac-poller]
660 ? S 0:00 [scsi_eh_3]
702 ? S< 0:00 [kpsmoused]
861 ? S< 0:00 [qla2xxx_3_dpc]
862 ? Ss 0:00 rpcbind -w
864 ? S< 0:00 [scsi_wq_3]
877 ? S 0:00 [scsi_eh_4]
879 ? Ss 0:00 rpc.statd -L
888 ? S< 0:00 [rpciod]
891 ? S< 0:00 [nfsiod]
893 ? S 0:00 upstart-socket-bridge --daemon
895 ? S< 0:00 [qla2xxx_4_dpc]
896 ? S< 0:00 [scsi_wq_4]
902 ? S< 0:00 [bond0]
1054 ? S< 0:00 [kdmflush]
1109 ? S< 0:00 [kdmflush]
1490 ? S 0:06 [jbd2/dm-2-8]
1491 ? S< 0:00 [ext4-dio-unwrit]
1530 ? D 0:42 [jbd2/dm-1-8]
1531 ? S< 0:00 [ext4-dio-unwrit]
1573 ? Ss 0:00 /usr/sbin/sshd -D
1576 ? Ss 0:00 rpc.idmapd
1580 ? Ss 0:00 dbus-daemon --system --fork --activation=upstart
1603 ? Sl 0:02 rsyslogd -c5
1677 tty4 Ss+ 0:00 /sbin/getty -8 38400 tty4
1684 tty5 Ss+ 0:00 /sbin/getty -8 38400 tty5
1693 tty2 Ss+ 0:00 /sbin/getty -8 38400 tty2
1697 tty3 Ss+ 0:00 /sbin/getty -8 38400 tty3
1703 tty6 Ss+ 0:00 /sbin/getty -8 38400 tty6
1710 ? Ss 0:00 acpid -c /etc/acpi/events -s /var/run/acpid.socket
1712 ? Ss 0:00 cron
1715 ? Ss 0:00 atd
1727 ? S 0:00 /usr/sbin/zabbix_agentd
1729 ? Ss 0:20 /usr/sbin/irqbalance
1733 ? Ssl 0:00 whoopsie
1738 ? Ssl 2:51 /usr/sbin/mysqld
1745 ? S 0:35 /usr/sbin/zabbix_agentd
1746 ? S 0:10 /usr/sbin/zabbix_agentd
1747 ? S 0:10 /usr/sbin/zabbix_agentd
1748 ? S 0:11 /usr/sbin/zabbix_agentd
1749 ? S 0:12 /usr/sbin/zabbix_agentd
1750 ? S 0:11 /usr/sbin/zabbix_agentd
1751 ? S 0:01 /usr/sbin/zabbix_agentd
1919 ? S 0:00 [kworker/5:2]
2004 ? S 0:00 [kworker/8:2]
2010 ? S 0:00 [kworker/11:2]
2011 ? S 0:00 [kworker/11:3]
2024 ? Sl 0:01 /opt/Unisphere/bin/hostagent -f /etc/Unisphere/agent.config
2046 ? SLl 0:08 /sbin/multipathd
2079 ? SLsl 0:19 /opt/microsoft/scx/bin/scxcimserver
2177 tty1 Ss+ 0:00 /sbin/getty -8 38400 tty1
2179 ? S 0:00 [flush-8:0]
2180 ? D 1:05 [flush-252:1]
2181 ? S 0:00 [flush-252:2]
2257 ? Ssl 0:28 /opt/microsoft/scx/bin/scxcimprovagt 0 9 12 root SCXCoreProviderModule
2422 ? Ss 0:02 /usr/sbin/ntpd -p /var/run/ntpd.pid -g -u 109:115
2625 ? Ss 0:00 sshd: ronaldm [priv]
2824 ? S 0:00 sshd: ronaldm at pts/0
2825 pts/0 Ss 0:00 -bash
2924 pts/0 S 0:00 sudo -i
2929 pts/0 S 0:00 -bash
3194 ? Ssl 0:01 /opt/microsoft/scx/bin/scxcimprovagt 0 8 14 scoma SCXUserCoreProviderModule
3207 ? S 0:17 [kworker/1:3]
3614 ? Ss 0:00 sshd: ronaldm [priv]
3753 ? S 0:00 sshd: ronaldm at pts/2
3754 pts/2 Ss 0:00 -bash
3868 pts/2 S 0:00 sudo -i
3874 pts/2 S 0:00 -bash
4925 ? S 0:00 [kworker/7:3]
5248 ? S 0:00 [kworker/u:2]
5251 ? S 0:00 [kworker/u:3]
5348 ? S 0:00 [kworker/10:2]
5353 ? S 0:00 [kworker/1:1]
5361 ? S 0:00 [kworker/0:1]
5382 ? S 0:00 [kworker/3:0]
5383 ? S 0:00 [kworker/3:3]
5384 ? S 0:00 [kworker/5:3]
5387 ? S 0:00 [kworker/0:5]
5391 ? S 0:00 [kworker/1:2]
5691 ? S 0:00 [kworker/7:4]
6088 ? S 0:00 [kworker/1:4]
6221 ? S 0:00 [kworker/4:2]
6260 ? S 0:00 [kworker/2:0]
6261 ? S 0:00 [kworker/2:4]
6521 pts/0 D+ 0:17 bonnie++ -d . -u root
6655 ? S 0:00 /sbin/udevd --daemon
6656 ? S 0:00 /sbin/udevd --daemon
6910 ? S 0:00 [kworker/1:0]
6915 pts/2 R+ 0:00 ps xa
Acceptatie - DB01 (root at ealxs00161):~# ps xa | grep multi
2046 ? SLl 0:08 /sbin/multipathd
6917 pts/2 S+ 0:00 grep --color=auto multi
Also, just before the crash:
Acceptatie - DB01 (root at ealxs00161):~# multipath -ll
LUN-DATABASE (36006016061e02e003cf1aca4ae07e211) dm-2 DGC,VRAID
size=200G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
|-+- policy='round-robin 0' prio=130 status=active
| |- 4:0:1:1 sdi 8:128 active ready running
| `- #:#:#:# - #:# active faulty running
`-+- policy='round-robin 0' prio=10 status=enabled
|- 4:0:0:1 sde 8:64 active ready running
`- #:#:#:# - #:# active faulty running
LUN-LOGGING (36006016061e02e000286c1adae07e211) dm-1 DGC,VRAID
size=20G features='0' hwhandler='1 emc' wp=rw
|-+- policy='round-robin 0' prio=130 status=active
| |- 4:0:0:0 sdd 8:48 active ready running
| `- #:#:#:# - #:# active faulty running
`-+- policy='round-robin 0' prio=10 status=enabled
|- 4:0:1:0 sdh 8:112 active ready running
`- #:#:#:# - #:# active faulty running
Output of dmsetup table -v before starting the tests:
Name: vg-swap
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 2
Event number: 0
Major, minor: 252, 0
Number of targets: 1
UUID: LVM-BySGZfHLAZg250K7UjTxYBStGjTdkb2CE8b7q7HMxBUtJso72BPYfnAcLpxixYP4
0 3997696 linear 8:2 512
Name: LUN-DATABASE
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 1
Event number: 4
Major, minor: 252, 2
Number of targets: 1
UUID: mpath-36006016061e02e003cf1aca4ae07e211
0 419430400 multipath 1 queue_if_no_path 1 emc 2 1 round-robin 0 2 1
8:128 1000 8:32 1000 round-robin 0 2 1 8:64 1000 8:96 1000
Name: LUN-LOGGING
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 1
Event number: 4
Major, minor: 252, 1
Number of targets: 1
UUID: mpath-36006016061e02e000286c1adae07e211
0 41943040 multipath 1 queue_if_no_path 1 emc 2 1 round-robin 0 2 1 8:48
1000 8:80 1000 round-robin 0 2 1 8:112 1000 8:16 1000
Output of lsscsi -lv before starting the tests:
[2:0:0:0] storage HP P420i 3.04 -
state=running queue_depth=1020 scsi_level=6 type=12 device_blocked=0 timeout=0
dir: /sys/bus/scsi/devices/2:0:0:0 [/sys/devices/pci0000:00/0000:00:02.2/0000:02:00.0/host2/target2:0:0/2:0:0:0]
[2:0:0:1] disk HP LOGICAL VOLUME 3.04 /dev/sda
state=running queue_depth=1020 scsi_level=6 type=0 device_blocked=0 timeout=30
dir: /sys/bus/scsi/devices/2:0:0:1 [/sys/devices/pci0000:00/0000:00:02.2/0000:02:00.0/host2/target2:0:0/2:0:0:1]
[3:0:0:0] disk DGC VRAID 0531 /dev/sdb
state=running queue_depth=32 scsi_level=5 type=0 device_blocked=0 timeout=30
dir: /sys/bus/scsi/devices/3:0:0:0 [/sys/devices/pci0000:00/0000:00:01.0/0000:07:00.0/host3/rport-3:0-0/target3:0:0/3:0:0:0]
[3:0:0:1] disk DGC VRAID 0531 /dev/sdc
state=running queue_depth=32 scsi_level=5 type=0 device_blocked=0 timeout=30
dir: /sys/bus/scsi/devices/3:0:0:1 [/sys/devices/pci0000:00/0000:00:01.0/0000:07:00.0/host3/rport-3:0-0/target3:0:0/3:0:0:1]
[3:0:1:0] disk DGC VRAID 0531 /dev/sdf
state=running queue_depth=32 scsi_level=5 type=0 device_blocked=0 timeout=30
dir: /sys/bus/scsi/devices/3:0:1:0 [/sys/devices/pci0000:00/0000:00:01.0/0000:07:00.0/host3/rport-3:0-1/target3:0:1/3:0:1:0]
[3:0:1:1] disk DGC VRAID 0531 /dev/sdg
state=running queue_depth=32 scsi_level=5 type=0 device_blocked=0 timeout=30
dir: /sys/bus/scsi/devices/3:0:1:1 [/sys/devices/pci0000:00/0000:00:01.0/0000:07:00.0/host3/rport-3:0-1/target3:0:1/3:0:1:1]
[4:0:0:0] disk DGC VRAID 0531 /dev/sdd
state=running queue_depth=32 scsi_level=5 type=0 device_blocked=0 timeout=30
dir: /sys/bus/scsi/devices/4:0:0:0 [/sys/devices/pci0000:00/0000:00:1c.0/0000:0a:00.0/host4/rport-4:0-0/target4:0:0/4:0:0:0]
[4:0:0:1] disk DGC VRAID 0531 /dev/sde
state=running queue_depth=32 scsi_level=5 type=0 device_blocked=0 timeout=30
dir: /sys/bus/scsi/devices/4:0:0:1 [/sys/devices/pci0000:00/0000:00:1c.0/0000:0a:00.0/host4/rport-4:0-0/target4:0:0/4:0:0:1]
[4:0:1:0] disk DGC VRAID 0531 /dev/sdh
state=running queue_depth=32 scsi_level=5 type=0 device_blocked=0 timeout=30
dir: /sys/bus/scsi/devices/4:0:1:0 [/sys/devices/pci0000:00/0000:00:1c.0/0000:0a:00.0/host4/rport-4:0-1/target4:0:1/4:0:1:0]
[4:0:1:1] disk DGC VRAID 0531 /dev/sdi
state=running queue_depth=32 scsi_level=5 type=0 device_blocked=0 timeout=30
dir: /sys/bus/scsi/devices/4:0:1:1 [/sys/devices/pci0000:00/0000:00:1c.0/0000:0a:00.0/host4/rport-4:0-1/target4:0:1/4:0:1:1]
I hope this helps...
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https://bugs.launchpad.net/bugs/1032550
Title:
[multipath] failed to get sysfs information
Status in “multipath-tools” package in Ubuntu:
In Progress
Bug description:
when shutdown switch port of host HBA, multippath-tool can't get
correct information of subpath. by check the "multipath" output,
some storage device type info disapppear and the failed path always
stay in path group and don't be clear out.
mpath2 (3600601601c102900944737e4a73fe011) dm-51 ,
size=6.0G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| |- #:#:#:# - #:# failed faulty running
| `- 5:0:2:5 sdcu 70:32 active ready running
`-+- policy='round-robin 0' prio=0 status=enabled
|- 5:0:3:5 sdfa 129:192 active ready running
`- #:#:#:# - #:# failed faulty running
mpath38 (3600601601c1029008eb6dbe8ae3fe011) dm-59 DGC,VRAID
size=5.0G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| `- 5:0:2:13 sddf 70:208 active ready running
`-+- policy='round-robin 0' prio=0 status=enabled
`- 5:0:3:13 sdfk 130:96 active ready running
mpath63 (360000970000198700131533030303932) dm-13 EMC,SYMMETRIX
size=5.6G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 5:0:0:8 sdl 8:176 active ready running
`- 5:0:1:8 sdbd 67:112 active ready running
mpath95 (360000970000198700131533030323445) dm-43 ,
size=898M features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- #:#:#:# - #:# failed faulty running
|- #:#:#:# - #:# failed faulty running
|- 5:0:0:38 sdas 66:192 active ready running
`- 5:0:1:38 sdck 69:128 active ready running
Same time, the syslog show many
---------------
Aug 2 18:25:16 Linux51 multipathd: sdht: failed to get sysfs information
Aug 2 18:25:16 Linux51 multipathd: sdht: unusable path
... ...
---------------
After path recover, all failed path come back without problem. there
is no IP blocked and error happend during fail/recover period.
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