[Bug 880645] Re: "btrfs device delete /dev/sdaX /" fails with error "ERROR: error removing the device '/dev/sdaX'"

[Rolf Leggewie]

The error as originally reported is due to btrfs converting meta and
system data to RAID1 when adding a second device to a single device
filesystem and rebalancing.  You can then no longer go below 2 devices.
Check dmesg or /var/log/syslog as suggested.  The remedy is to mconvert
to single and remove the device then.  Then another mconvert to DUP.
Cumbersome indeed, but not a bug.

Most comments from #8 onwards are about different issues and should be
dealt with in their own tickets.

** Changed in: btrfs-tools (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/880645

Title:
  "btrfs device delete /dev/sdaX /" fails with error "ERROR: error
  removing the device '/dev/sdaX'"

Status in btrfs-tools package in Ubuntu:
  Invalid

Bug description:
  What I did to cause this:

  Installed ubuntu using btrtfs root.
  Added a device with 'btrfs device add /dev/sda9 /'
  Balanced the file system with 'btrfs filesystem balance /'
  Tried to remove a device with 'btrfs device delete /dev/sda9 /'. Noticed that I got the error "ERROR: error removing the device '/dev/sda9'".

  (Unfortunately, I'm not sure how to get more information on the
  problem.)

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: btrfs-tools 0.19+20100601-3ubuntu3
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  Date: Mon Oct 24 00:44:42 2011
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111010)
  ProcEnviron:
   LC_CTYPE=C
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/zsh
  SourcePackage: btrfs-tools
  UpgradeStatus: No upgrade log present (probably fresh install)

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