[Bug 1032550] Re: [multipath] failed to get sysfs information

[Ronald Moesbergen]

The normal state of the disks is as follows:

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
| |- 4:0:0:1 sdg 8:96  active ready running
| `- 3:0:0:1 sdc 8:32  active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
  |- 4:0:1:1 sdi 8:128 active ready running
  `- 3:0:1:1 sde 8:64  active ready running
LUN-LOGGING (36006016061e02e000286c1adae07e211) dm-1 DGC,VRAID
size=20G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
|-+- policy='round-robin 0' prio=130 status=active
| |- 4:0:1:0 sdh 8:112 active ready running
| `- 3:0:1:0 sdd 8:48  active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
  |- 4:0:0:0 sdf 8:80  active ready running
  `- 3:0:0:0 sdb 8:16  active ready running

So one LUN of 20G, another of 200G, both having 4 path's to the SAN.

Today's test started at Dec 21 10:53:44, with this:
ealxs00161 kernel: [62445.130300] qla2xxx [0000:07:00.0]-500b:3: LOOP DOWN detected (2 3 0 0).

It took several up/down sequences to reproduce the problem.

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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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