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[Bug 1247901] Re: Querying Windows via WMI intermittently fails in get_device_number_for_target

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>
Date: Wed, 05 Mar 2014 13:10:47 -0000
Reply-to: Bug 1247901 <1247901@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

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

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https://bugs.launchpad.net/bugs/1247901

Title:
  Querying Windows via WMI intermittently fails in
  get_device_number_for_target

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  The WMI query in basevolumeutils.get_device_number_for_target can
  incorrectly return no device_number during extended stress runs.  We
  saw that it would return incorrect data after about an hour.  It could
  also return an initiator_sessions object that was empty.

  By adding a check to make sure that devices wasn't empty and adding a
  retry loop in volumeops._get_mounted_disk_from_lun we could avoid
  hitting the case where it thought it couldn't get a mounted disk for
  the target_iqn.

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