On 09/12/2014 19:15, Florian Uekermann wrote:
I am using a few disks in Raid1 mode. This is the output of various
commands in unmounted state.
root@oot:/# uname -a
Linux oot 3.18.0-rc5+ #1 SMP Sun Nov 23 18:01:56 CET 2014 x86_64 GNU/Linux
root@oot:/# btrfs --version
Btrfs v3.17
root@oot:/# btrfs fi show
Label: none uuid: be2b3499-7452-4b91-b664-4ec4d7ff62b9
Total devices 3 FS bytes used 149.68GiB
devid 2 size 465.76GiB used 151.03GiB path /dev/sdb
devid 3 size 465.76GiB used 151.03GiB path /dev/sda
devid 4 size 92.26GiB used 0.00B path /dev/sdc4
Btrfs v3.17
root@oot:/# btrfs fi df /srv/storage/
Data, RAID1: total=150.00GiB, used=149.40GiB
System, RAID1: total=32.00MiB, used=48.00KiB
Metadata, RAID1: total=1.00GiB, used=287.42MiB
GlobalReserve, single: total=96.00MiB, used=0.00B
I stripped a few lines from the output of btrfs fi show, which
describe other filesystems.
If I unmount the devices in question, I get the following
output (note that missing devices are reported now):
root@oot:/# btrfs fi show
Label: none uuid: be2b3499-7452-4b91-b664-4ec4d7ff62b9
Total devices 4 FS bytes used 149.68GiB
devid 2 size 465.76GiB used 151.03GiB path /dev/sdb
devid 3 size 465.76GiB used 151.03GiB path /dev/sda
devid 4 size 92.26GiB used 0.00B path /dev/sdc4
*** Some devices missing
Btrfs v3.17
I got into this state by removing a device from the array formatting it
and then adding it again (some time ago, I can't remember the exact
sequence of commands)
above you mention both btrfs fi show outputs in unmounted only.
It depends on the disk that is read first, you could read super block
using btrfs-show-super and check if num_device.
The discrepancy in output between mounted and unmounted state is not
a problem in itself for me, but this issue seems to interrupt systemds
boot sequence, which only continues successfully if I mount the array manually.
The array is not degraded, I just removed a drive (via btrfs delete I think).
It may fail if you are mounting more than one subvol during boot and if
you don't have this patch.
commit 0f23ae74f589304bf33233f85737f4fd368549eb
Author: Chris Mason <clm@xxxxxx>
Date: Thu Sep 18 07:49:05 2014 -0700
Revert "Btrfs: device_list_add() should not update list when mounted"
This reverts commit b96de000bc8bc9688b3a2abea4332bd57648a49f.
If I try to remove the "missing devices" with the btrfs tool the following
happens:
btrfs dev del missing /srv/storage
ERROR: error removing the device 'missing' - no missing devices found to remove
that means you don't see missing when mounted. if you don't see
missing when mounted then no need to run delete missing. ?
btrfs balance start /srv/storage/ does not solve the issue.
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