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[Bug 1175648] Re: Boot time volume attachment lacks reservation of the volume till the completion of the attachment

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Sean Dague <sean@xxxxxxxxx>
Date: Wed, 01 Apr 2015 15:18:14 -0000
Reply-to: Bug 1175648 <1175648@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: nova
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1175648

Title:
  Boot time volume attachment lacks reservation of the volume till the
  completion of the attachment

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  Volumes attached at boot can be accepted for attachment but before the
  attachment completes it's possible for the volume to be used
  elsewhere. The dynamic volume-attach reserves the volume by changing
  the state from 'available' to 'attaching'. This needs to be done for
  boot time attachments as well. But care should be taken to rollback
  the state of the volume if the booting aborts.

  Steps to recreate:

  1. Boot an instance VM1 with block-device-mapping a volume V1.
  2. Around the same time volume-attach V1 to another instance VM2.

  It is likely that the volume V1 gets attached to VM2 and VM1 to ends
  up in ERROR.

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