[Bug 1589526] Re: fcp multipath devices does not exist after reboot

[Frank Heimes]

** Changed in: ubuntu-z-systems
       Status: New => Triaged

** Changed in: ubuntu-z-systems
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1589526

Title:
  fcp multipath devices does not exist after reboot

Status in Ubuntu on IBM z Systems:
  Triaged
Status in multipath-tools package in Ubuntu:
  New

Bug description:
  == Comment: #0 - Ofer Baruch <OFERBA at il.ibm.com> - 2016-06-06 06:37:19 ==
  Hi,

  i have installed an Ubuntu Server from the installation ISO.
  i then installed multipath support (multipath-tools and multipath-tools-boot).
  i added an FCP device, format it, mount it and added to the fstab using it's /dev/mapper representation. everything worked fine...
  i then reboot the server and it failed to start due to the missing /dev/mapper device that needs to be mounted (as the fstab states).
  i get into maintenance mode.

  i am not using cio_ignore and the devices are available in maintenance mode.
  running multipath -ll will fail to show the device (as expected... that is why the boot failed).
  running multipat without any parameters (to rescan) will find the devices and it will now show on multipath -ll.

  i was able to get around this by rebuilding the initrd and running
  zipl... but that should not be the case. multipath should scan during
  reboot to find all the devices available.

  i am attaching both an sosreport and dbginfo for you to review.
  i hope this is something i am doing wrong but i don't think so...
  either way i would love to get a quick workaround that will avoid this issue without rebuilding the initrd.

  == Comment: #4 - Hendrik Brueckner <brueckner at de.ibm.com> - 2016-06-06 06:44:53 ==
  Hi Ofer,

  (In reply to comment #0)
  > i have installed an Ubuntu Server from the installation ISO.
  > i then installed multipath support (multipath-tools and
  > multipath-tools-boot).
  > i added an FCP device, format it, mount it and added to the fstab using it's

  How did you add the FCP device?

  == Comment: #5 - Ofer Baruch <OFERBA at il.ibm.com> - 2016-06-06 07:07:42 ==
  using: 

  chzdev zfcp-host <fcp_vdev> -e -p

  that is after i vary the device online.
  as i said the device comes online just fine... i can see all the /dev/sd* devices.
  i am just missing the multipath device.

  == Comment: #6 - Ofer Baruch <OFERBA at il.ibm.com> - 2016-06-06 07:11:09 ==
  the missing file is:
  /dev/mapper/3600507630bffc0470000000000002333

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