[Bug 955510] [NEW] failed attach leaves stale iSCSI session on compute host

[Paul Collins]

Public bug reported:

Version: 2012.1~e4~20120217.12709-0ubuntu1

I attempted to attach an iSCSI volume to one of my instances.  This
failed because I specified /dev/vdb as the device, which was in use.
Any further attempts to attach the volume then also failed.  When I
inspected nova-compute.log, I discovered the following at the end
(full log attached):

(nova.rpc.common): TRACE: Stdout: 'Logging in to [iface: default, target: iqn.2010-10.org.openstack:volume-00000009, portal: YY.YY.YY.15,3260]\n'
(nova.rpc.common): TRACE: Stderr: 'iscsiadm: Could not login to [iface: default, target: iqn.2010-10.org.openstack:volume-00000009, portal: YY.YY.YY.15,3260]: \niscsiadm: initiator reported error (15 - already exists)\n'

I guessed from this that the previous failed attach had left the iSCSI
session up and that nova-compute wasn't able to deal with this.  I logged
into the compute node, removed it with "iscsiadm --mode node
--targetname iqn.2010-10.org.openstack:volume-00000009 --portal
YY.YY.YY.15:3260 --logout" and was then able to attach the volume
to my instance.

** Affects: nova (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: canonistack

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https://bugs.launchpad.net/bugs/955510

Title:
  failed attach leaves stale iSCSI session on compute host

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