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[Bug 889299] Re: volume/snapshots takes very long to delete

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>
Date: Wed, 05 Mar 2014 13:17:45 -0000
Reply-to: Bug 889299 <889299@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: nova
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/889299

Title:
  volume/snapshots takes very long to delete

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  I have a large number of snapshots created from a volume. These are
  COW snapshots so the actual disk space they take is not large, but
  when I try to delete them using the OSAPI, it takes a very long time
  to delete each one of them. The volumes and snapshots are based on
  LVM.

  Looking at the code, nova-volumes clears the volume/snapshots using
  "dd if=/dev/zero of=/dev/mapper/<vol-name>", which is what takes a
  long time for large volumes/snapshots. This should be done in a lazy
  fashion (as mentioned in a TODO comment in the code).

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