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

[Jakub Pavlik]

I can confirm this issue at

root at cpt151:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.1 LTS
Release:        14.04
Codename:       trusty


root at cpt151:~# dpkg -s multipath-tools
Package: multipath-tools
Status: install ok installed
Priority: extra
Section: admin
Installed-Size: 626
Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
Architecture: amd64
Version: 0.4.9-3ubuntu7.2
Depends: libaio1 (>= 0.3.106-8), libc6 (>= 2.14), libdevmapper1.02.1 (>= 2:1.02.36), libreadline6 (>= 6.0), udev (>> 136-1), initscripts (>= 2.85-16), kpartx (>= 0.4.9-3ubuntu7.2), lsb-base (>= 3)
Suggests: multipath-tools-boot
Conflicts: multipath-tools-boot (<= 0.4.8+git0.761c66f-2~), multipath-tools-initramfs (<= 1.0.1)
Conffiles:
 /etc/init.d/multipath-tools-boot e3b1a4949a282ceeda254c185f780002
 /etc/init.d/multipath-tools b0f5ff36184c823ec91ffd8b36133949
Description: maintain multipath block device access
 These tools are in charge of maintaining the disk multipath device maps and
 react to path and map events.
 .
 If you install this package you may have to change the way you address block
 devices. See README.Debian for details.
Homepage: http://christophe.varoqui.free.fr/
Original-Maintainer: Debian LVM Team <pkg-lvm-maintainers at lists.alioth.debian.org>

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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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