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[Bug 1175366] Re: Fibre Channel Multipath attach race condition

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>
Date: Wed, 17 Jul 2013 12:19:44 -0000
Reply-to: Bug 1175366 <1175366@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => havana-2

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https://bugs.launchpad.net/bugs/1175366

Title:
  Fibre Channel Multipath attach race condition

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  When the system is under load and a Fibre Channel attach happens with
  multipath installed, sometimes only 1 devices shows up under multipath
  -l command.   This causes the detach to fail to detach all of the
  devices since the libvirt volume code runs multipath -l at attach
  time, and not all devices show up at that time due to system load
  and/or FC fabric traffic.

  We need to rediscover all of the devices at detach time and ensure we
  are removing all of those devices.   The devices should exist at
  detach time.

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