[Bug 1400371] [NEW] multipathd doesn't reconfigure

[Fabian Zimmermann]

Public bug reported:

I'm currently using a dual iscsi-connection to our san on 14.04 and
trying to enable multipath. I want to use the "no_path_retry"-feature
instead of "queue_if_no_path". It's working if I start everything
manually, but it doesn't work after a reboot, because multipathd doesn't
know the multipathed iscsi disks.

to reproduce:

* disconnect your iscsi-sessions
* reconfigure your multipathd
* "show paths" should be empty
* stop your multipathd

* start your multipathd
* start your iscsi-connections

multipath -ll
--
size=4.0T features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- 10:0:0:0 sdc  8:32  active ready  running
  `- 11:0:0:0 sda  8:0   active ready  running
--

Now I would expect multipathd to check the paths and disable "queue_if_no_path" if max-retry is reached or multipathd exits, but
"show config" is empty and multipathd isn't doing anything.

--
 echo 'show paths' | multipathd -k
multipathd> show paths
multipathd>
--

If I execute a "reconfigure" everything is detected and checks are executed.
--
# echo "reconfigure" | multipathd -k
multipathd> reconfigure
ok
# echo 'show paths' | multipathd -k
multipathd> show paths
hcil     dev dev_t pri dm_st  chk_st dev_st  next_check
11:0:0:0 sda 8:0   1   active ready  running XXXXXXX... 7/10
10:0:0:0 sdc 8:32  1   active ready  running XXXXXXX... 7/10
--

But during boot nobody is triggering this "reconfigure", so multipathd
isn't checking the paths and queue_if_no_path will not be removed after
max-retry is reached causing a system hang if storage isn't reachable.

** Affects: multipath-tools (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1400371

Title:
  multipathd doesn't reconfigure

Status in multipath-tools package in Ubuntu:
  New

Bug description:
  I'm currently using a dual iscsi-connection to our san on 14.04 and
  trying to enable multipath. I want to use the "no_path_retry"-feature
  instead of "queue_if_no_path". It's working if I start everything
  manually, but it doesn't work after a reboot, because multipathd
  doesn't know the multipathed iscsi disks.

  to reproduce:

  * disconnect your iscsi-sessions
  * reconfigure your multipathd
  * "show paths" should be empty
  * stop your multipathd

  * start your multipathd
  * start your iscsi-connections

  multipath -ll
  --
  size=4.0T features='1 queue_if_no_path' hwhandler='0' wp=rw
  `-+- policy='round-robin 0' prio=1 status=active
    |- 10:0:0:0 sdc  8:32  active ready  running
    `- 11:0:0:0 sda  8:0   active ready  running
  --

  Now I would expect multipathd to check the paths and disable "queue_if_no_path" if max-retry is reached or multipathd exits, but
  "show config" is empty and multipathd isn't doing anything.

  --
   echo 'show paths' | multipathd -k
  multipathd> show paths
  multipathd>
  --

  If I execute a "reconfigure" everything is detected and checks are executed.
  --
  # echo "reconfigure" | multipathd -k
  multipathd> reconfigure
  ok
  # echo 'show paths' | multipathd -k
  multipathd> show paths
  hcil     dev dev_t pri dm_st  chk_st dev_st  next_check
  11:0:0:0 sda 8:0   1   active ready  running XXXXXXX... 7/10
  10:0:0:0 sdc 8:32  1   active ready  running XXXXXXX... 7/10
  --

  But during boot nobody is triggering this "reconfigure", so multipathd
  isn't checking the paths and queue_if_no_path will not be removed
  after max-retry is reached causing a system hang if storage isn't
  reachable.

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