I get an error when trying to remove one disk from a set of three (so metadata
could still be mirrored). This is on Precise Pangolin. I also include the
output of "filesystem show", as something clearly happened here, although I'm
unsure how to interpret it.
% sudo btrfs fi show
Label: 'scratch' uuid: 184706ea-89f5-438a-a9f5-b5e91b3ce267
Total devices 3 FS bytes used 140.62GB
devid 1 size 2.73TB used 138.02GB path /dev/sda
devid 2 size 2.73TB used 137.01GB path /dev/sdb
devid 3 size 2.73TB used 138.01GB path /dev/sdc
% sudo btrfs dev del /dev/sdc /scratch
ERROR: error removing the device '/dev/sdc'
% sudo btrfs fi show
Label: 'scratch' uuid: 184706ea-89f5-438a-a9f5-b5e91b3ce267
Total devices 3 FS bytes used 141.49GB
devid 1 size 2.73TB used 75.03GB path /dev/sda
devid 2 size 2.73TB used 75.01GB path /dev/sdb
devid 3 size 2.73TB used 138.01GB path /dev/sdc
Btrfs Btrfs v0.19
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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'"
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