On my installation I can delete a volume that is referenced by a 
snapshot. I will try to understand why this is so and get back to 
you.

Though as I said in my previous message the behavior of the LVM based 
driver is different to the behavior I described in my original bug 
report.


Regards,
Ollie

-----Original Message-----
From: <email address hidden> [mailto:<email address hidden>] On Behalf Of Isaku Yamahata
Sent: 14 November 2011 19:06
To: Leahy, Oliver
Subject: Re: [Bug 888649] [NEW] Snapshots left in undeletable state

On Thu, Nov 10, 2011 at 05:43:59PM -0000, Ollie Leahy wrote:
> $ euca-create-volume -s 1 -z nova
> VOLUME	vol-0000007c	1	creating (bocktest, None, None, None)	2011-11-10T17:36:41Z
> # euca-create-snapshot vol-0000007c
> SNAPSHOT	snap-00000018	vol-0000007c	creating	2011-11-10T17:37:33Z	0%
> # euca-delete-volume vol-0000007c# euca-delete-volume vol-0000007c
> VOLUME	vol-0000007c

This volume in LVM with snapshot shouldn't be deleted
with VolumeIsBusy exception.
(At least it's my intension of VolumeDriver::delete_volume() with lvdisplay)
Can you please track down why it can be deleted?

If this volume in LVM is deleted, the all of derived snapshots are
deleted at the same time. So the following lvremove for snapshot
would fail. It explains the below behavior.

thanks,
-- 
yamahata

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https://bugs.launchpad.net/bugs/888649

Title:
  Snapshots left in undeletable state

Status in OpenStack Compute (Nova):
  New

Bug description:
  If a volume is created using the euca api,
                       then a snapshot is created from the volume
                       then the volume is deleted
  the snapshot cannot now be deleted. If the user tries
  to delete the snapshot it ends up in the state 'error_deleting'
  and remains in the system.

  The following sequence of euca commands illustrates the problem

  $ euca-create-volume -s 1 -z nova
  VOLUME	vol-0000007c	1	creating (bocktest, None, None, None)	2011-11-10T17:36:41Z
  # euca-create-snapshot vol-0000007c
  SNAPSHOT	snap-00000018	vol-0000007c	creating	2011-11-10T17:37:33Z	0%
  # euca-delete-volume vol-0000007c# euca-delete-volume vol-0000007c
  VOLUME	vol-0000007c
  # euca-delete-snapshot snap-00000018
  SNAPSHOT	snap-00000018
  # euca-describe-snapshots 
  SNAPSHOT	snap-00000018	vol-0000007c	error_deleting	2011-11-10T17:37:33Z	100%
  # euca-delete-snapshot snap-00000018
  Traceback (most recent call last):
    File "/usr/bin/euca-delete-snapshot", line 110, in <module>
      main()
    File "/usr/bin/euca-delete-snapshot", line 101, in main
      return_code = euca_conn.delete_snapshot(snapshot_id)
    File "/usr/lib/pymodules/python2.7/boto/ec2/connection.py", line 1112, in delete_snapshot
      return self.get_status('DeleteSnapshot', params)
    File "/usr/lib/pymodules/python2.7/boto/connection.py", line 648, in get_status
      raise self.ResponseError(response.status, response.reason, body)
  boto.exception.EC2ResponseError: EC2ResponseError: 400 Bad Request
  <?xml version="1.0"?>
  <Response><Errors><Error><Code>ApiError</Code><Message>Snapshot status must be available</Message></Error></Errors><RequestID>286ce49b-3c6d-4dcb-8130-52afe8b9ba94</RequestID></Response>

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