Trying:
btrfs device delete missing /
appears not to do anything for a "/" mount for where I have swapped out
a HDD:
# btrfs filesystem show
Label: 'test_btrfs_misc_5' uuid: 7d29d4e6-efdc-41dc-9aa8-e74dfbe13cc9
Total devices 2 FS bytes used 28.00KB
devid 1 size 59.74GB used 2.03GB path /dev/sdd5
*** Some devices missing
Label: 'test_btrfs_root_4' uuid: 269e142c-e561-4227-b2b0-fe2f9fb99391
Total devices 3 FS bytes used 10.55GB
devid 4 size 56.00GB used 12.03GB path /dev/sde4
devid 1 size 56.00GB used 12.05GB path /dev/sdd4
*** Some devices missing
Btrfs v0.20-rc1-358-g194aa4a
# btrfs device delete missing /
# btrfs filesystem show
Label: 'test_btrfs_misc_5' uuid: 7d29d4e6-efdc-41dc-9aa8-e74dfbe13cc9
Total devices 2 FS bytes used 28.00KB
devid 1 size 59.74GB used 2.03GB path /dev/sdd5
*** Some devices missing
Label: 'test_btrfs_root_4' uuid: 269e142c-e561-4227-b2b0-fe2f9fb99391
Total devices 3 FS bytes used 10.55GB
devid 4 size 56.00GB used 12.03GB path /dev/sde4
devid 1 size 56.00GB used 12.05GB path /dev/sdd4
*** Some devices missing
Btrfs v0.20-rc1-358-g194aa4a
All on the latest "Linux 3.11.5-gentoo".
# df -h | egrep '/$'
rootfs 112G 22G 89G 20% /
/dev/sdd4 112G 22G 89G 20% /
Aside: Adding the /dev/sde4 device caused no balance action until I
deleted a device to reduce the raid1 mirror (data and metadata) down to
the two devices.
The "missing" device was an old HDD that had physically failed. No data
was lost for that example failure.
Hope of interest,
Martin
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