live-migration of instances fail with Cinder volume by LVM backend and TgtAdm

[Tomoki Sekiyama]

With LVM driver backend configured as 'iscsi_helper = tgtadm', live migration of nova instances fail if cinder volumes are attached.

On the compute node which the instance migrates to, nova-compute fails to login to the attached iSCSI volume due to CHAP authentication failure. Because of this, the live-migration process is aborted.

This bug is the same with bug #1383509, which is once fixed, but reproduced by commit 9651f547147188645942466602c92cce06666483.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/145391

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/145391
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=9df3bcead5e9ba89fc8a4130729679fb17a27133
Submitter: Jenkins
Branch: master

commit 9df3bcead5e9ba89fc8a4130729679fb17a27133
Author: Tomoki Sekiyama <email address hidden>
Date: Tue Jan 6 19:58:13 2015 -0500

    TgtAdm: Don't change CHAP username/password on live migration

    This fixes TgtAdm Target Objects not to regenerate random
    username/password every time initialize_connection is called,
    as TgtAdm doesn't accept the change while the initiator is
    connected. This fixes the live-migration of nova instances which
    have volumes attached.

    Change-Id: I1b48a66da5a0d8726490f50c2ee58352c42d9587
    Closes-Bug: #1408162
    Related-Bug: #1383509