yahoo-eng-team team mailing list archive

[Matthew Booth <mbooth@xxxxxxxxxx>]

Public bug reported:

The libvirt driver caches the output of mkfs and mkswap in the image
cache. One consequence of this is that all ephemeral disks of a
particular size and format on a single compute will have the same UUID.
The same applies to swap disks. These identifiers are intended to be
universally unique, but they are not.

This is unlikely to be an issue in practise for ephemeral disks, as they
will never be shared, however it is a wart.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1547577

Title:
  ephemeral and swap disks on a single compute share UUIDs

Status in OpenStack Compute (nova):
  New

Bug description:
  The libvirt driver caches the output of mkfs and mkswap in the image
  cache. One consequence of this is that all ephemeral disks of a
  particular size and format on a single compute will have the same
  UUID. The same applies to swap disks. These identifiers are intended
  to be universally unique, but they are not.

  This is unlikely to be an issue in practise for ephemeral disks, as
  they will never be shared, however it is a wart.

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