Just a note_ btrfs fi show reads from the disks which could read the cache, you
may try drop the cache or, use btrfs-progs from David latest integration to see
kernel perspective.
Martin <m_btrfs@ml1.co.uk> wrote:
>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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