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[Bug 919461] Re: Unrescue assumes swap disk is always returned as first disk

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <919461@xxxxxxxxxxxxxxxxxx>
Date: Wed, 01 Jun 2016 04:17:29 -0000
Reply-to: Bug 919461 <919461@xxxxxxxxxxxxxxxxxx>
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[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]

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

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https://bugs.launchpad.net/bugs/919461

Title:
  Unrescue assumes swap disk is always returned as first disk

Status in OpenStack Compute (nova):
  Expired

Bug description:
  This isn't necessarily a bug, but rather a placeholder tix to
  investigate a dubious assumption in the code.

  Currently, unrescue queries for VBDs related to the instance and then
  assumes that the second VBD will always be the root fs.

  This seems to work, but it would be a good idea to understand exactly
  why this works (it's not obvious AFAICT).

  A safer approach would be to use the name-labels on the vbd to
  determine which is the root vs swap disk.

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