multipathd doesn't reconfigure

[Fabian Zimmermann]

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.

[Fabian Zimmermann (dev-faz)]

Looks like this comment describes the problem

https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/1240049/comments/13