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[Bug 1242819] Re: Remove unnecessary steps for cold snapshots

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Alan Pevec <1242819@xxxxxxxxxxxxxxxxxx>
Date: Mon, 22 Sep 2014 13:08:57 -0000
Reply-to: Bug 1242819 <1242819@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Also affects: nova/havana
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1242819

Title:
  Remove unnecessary steps for cold snapshots

Status in OpenStack Compute (Nova):
  Fix Released
Status in OpenStack Compute (nova) havana series:
  New

Bug description:
  When creating cold snapshots we first stop the instance, create a snapshot of that instance, extract the snapshot to a file, delete the snapshot and bring the instance back up.
  If the instance is stopped, then there's no need to create a snapshot because there's no concurrent writer, so the snapshot can be extracted directly and save us from the two unnecessary steps (creation and deletion of a snapshot).

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