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

[Thomas Mayer]

I agree that this issue is not a bug as long as the behaviour I
experienced is intentional.

I fully agree that in case the behaviour is intentional, it also should
be documented somewhere (including kernel versions in case of breaking
changes).

I also agree that btrfs tools' output should be more verbose and give
hints what happens in the background and why operations just don't work
any more and how to fix it. I think that I was quite close to a data
loss, which is why I think this issue still is relevant and somehow
critical (from a usability perspective at least).

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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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