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[Lucian Petrut <lpetrut@xxxxxxxxxxxxxxxxxxxxxx>]

Reviewed: https://review.openstack.org/249291
Committed: https://git.openstack.org/cgit/openstack/os-win/commit/?id=b72790bacfd356021b2dd870ade6c9c216fd14a0
Submitter: Jenkins
Branch: master

commit b72790bacfd356021b2dd870ade6c9c216fd14a0
Author: Lucian Petrut <lpetrut@xxxxxxxxxxxxxxxxxxxxxx>
Date: Fri Nov 20 16:20:40 2015 +0200

    iSCSI initiator refactoring using iscsidsc.dll

    This patch adds a new iscsi initiator utils class,
    leveraging iscsidsc.dll functions.

    The advantages are:
    * Same error output as iscsicli, without the proccess spawn
      overhead
    * Improved overall performance, having finer control over
      the iSCSI initiator and avoiding unnecessary operations
    * Fixed bugs related to LUN discovery
    * Static targets are used instead of having portal discovery
      sessions. This will let us use backends that require
      discovery credentials (which may be different than the
      credentials used when logging in targets)
    * improved MPIO support (the caller must request logging in the
      target for each of the available portals. Logging in multiple
      targets exporting the same LUN is also supported). Also, a
      specific initiator can be requested when creating sessions.

    Closes-Bug: #1403836
    Closes-Bug: #1372823
    Closes-Bug: #1372827

    Co-Authored-By: Alin Balutoiu <abalutoiu@xxxxxxxxxxxxxxxxxxxxxx>
    Change-Id: Ie037cf1712a28e85e5eca445eea3df883c6b6831

** Also affects: os-win
   Importance: Undecided
       Status: New

** Changed in: os-win
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1372823

Title:
  iSCSI LUN list not refreshed in Hyper-V 2012 R2 compute nodes

Status in os-win:
  Fix Released

Bug description:
  When an iSCSI volume is attached to Hyper-V, the OS has to refresh the
  list of LUNs on the iSCSI target to discover the new one.

  The current mechanism implemented only works for the first LUN because
  the connection to the target is done after the LUN is exposed to the
  hypervisor. The rest of LUNs exposed to the hypervisor hosted in the
  same iSCSI target won't be refreshed on time to be discovered by the
  machine.

  This looks related with the wrong assumption of having one LUN per
  iscsi target, but it's also possible to have several LUNs per iscsi
  target.

  The patch for this bug should refresh the list of LUNs when a new
  attachment request is received. In our test environment (Hyper-V 2012
  R2), a WMI call like the following one helped to solve this issue:

  self._conn_storage.query("SELECT * FROM MSFT_iSCSISessionToDisk")

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