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Public bug reported:

from https://answers.launchpad.net/ubuntu/+question/253962:

I was looking into how to repair LVM2 thin pool metadata and noticed
that Ubuntu ships with LVM2 tools 2.02.98-6. In 2.02.98-9 (in Fedora),
the option to swap a thin pool metadata device was added: Add lvconvert
support to swap thin pool metadata volume --
https://apps.fedoraproject.org/packages/lvm2/changelog. It's also
present in the 2.02.99 release of LVM2 itself: http://upstream-
tracker.org/changelogs/lvm2/2.02.99/changelog.html.

Without this option, it's difficult (I can't figure out at the moment
how, exactly) to take a thin pool metadata device offline to perform
metadata repair. Would be great to include a fix for this in Ubuntu.

** Affects: lvm2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1432646

Title:
  14.04: thinpool metadata repair is not supported

Status in lvm2 package in Ubuntu:
  New

Bug description:
  from https://answers.launchpad.net/ubuntu/+question/253962:

  I was looking into how to repair LVM2 thin pool metadata and noticed
  that Ubuntu ships with LVM2 tools 2.02.98-6. In 2.02.98-9 (in Fedora),
  the option to swap a thin pool metadata device was added: Add
  lvconvert support to swap thin pool metadata volume --
  https://apps.fedoraproject.org/packages/lvm2/changelog. It's also
  present in the 2.02.99 release of LVM2 itself: http://upstream-
  tracker.org/changelogs/lvm2/2.02.99/changelog.html.

  Without this option, it's difficult (I can't figure out at the moment
  how, exactly) to take a thin pool metadata device offline to perform
  metadata repair. Would be great to include a fix for this in Ubuntu.

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