[Bug 1596201] [NEW] fails to convert meta/system directly from RAID1 to DUP

[Rolf Leggewie]

Public bug reported:

btrfs balance fails when trying to convert metadata or system chunks to
dup profile on filesystems with multiple devices. This requires that a
conversion from a multi-device filesystem to a single-device one go
through a state of no redundancy for a brief period.

This was discussed two years ago in http://linux-
btrfs.vger.kernel.narkive.com/KpQhMabL/patch-btrfs-allow-forced-
conversion-of-metadata-to-dup-profile-on-multiple-devices and apparently
only recently fixed in upstream 4.6 according to #btrfs.  Yakkety is
still on 4.4 and we should look into backporting the patch for xenial.

** Affects: btrfs-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: xenial yakkety

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https://bugs.launchpad.net/bugs/1596201

Title:
  fails to convert meta/system directly from RAID1 to DUP

Status in btrfs-tools package in Ubuntu:
  New

Bug description:
  btrfs balance fails when trying to convert metadata or system chunks
  to dup profile on filesystems with multiple devices. This requires
  that a conversion from a multi-device filesystem to a single-device
  one go through a state of no redundancy for a brief period.

  This was discussed two years ago in http://linux-
  btrfs.vger.kernel.narkive.com/KpQhMabL/patch-btrfs-allow-forced-
  conversion-of-metadata-to-dup-profile-on-multiple-devices and
  apparently only recently fixed in upstream 4.6 according to #btrfs.
  Yakkety is still on 4.4 and we should look into backporting the patch
  for xenial.

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