btrfs device delete missing problem

btrfs device delete missing problem

[Mark Murawski]

Using the latest mason git (and kernel 3.3.4)

stan {~} root# btrfs  filesystem show
Label: none  uuid: d71404d4-468e-47d5-8f06-3b65fa7776aa
         Total devices 2 FS bytes used 7.09GB
         devid    2 size 9.31GB used 9.09GB path /dev/sdd6
         devid    1 size 9.31GB used 9.09GB path /dev/sdg6

Label: none  uuid: b142f575-df1c-4a57-8846-a43b979e2e09
         Total devices 9 FS bytes used 1.35TB
         devid    8 size 1.36TB used 1.07TB path /dev/sda
         devid    7 size 1.36TB used 1.07TB path /dev/sde
         devid    2 size 465.76GB used 134.00GB path /dev/sdb
         devid    4 size 149.05GB used 0.00 path /dev/sdc
         devid    9 size 465.76GB used 161.00GB path /dev/sdf
         devid    3 size 149.05GB used 0.00 path /dev/sdh
         devid    5 size 920.34GB used 616.03GB path /dev/sdd7
         devid    6 size 920.34GB used 616.03GB path /dev/sdg7
         *** Some devices missing

stan {~} root# btrfs device delete missing /storage
May  5 05:28:40 stan kernel: btrfs: relocating block group 0 flags 2
stan {~} root#

stan {~} root# btrfs  filesystem show
Label: none  uuid: d71404d4-468e-47d5-8f06-3b65fa7776aa
         Total devices 2 FS bytes used 7.09GB
         devid    1 size 9.31GB used 9.09GB path /dev/sdg6
         devid    2 size 9.31GB used 9.09GB path /dev/sdd6

Label: none  uuid: b142f575-df1c-4a57-8846-a43b979e2e09
         Total devices 9 FS bytes used 1.35TB
         devid    3 size 149.05GB used 0.00 path /dev/sdh
         devid    6 size 920.34GB used 616.03GB path /dev/sdg7
         devid    9 size 465.76GB used 161.00GB path /dev/sdf
         devid    7 size 1.36TB used 1.07TB path /dev/sde
         devid    5 size 920.34GB used 616.03GB path /dev/sdd7
         devid    4 size 149.05GB used 0.00 path /dev/sdc
         devid    2 size 465.76GB used 134.00GB path /dev/sdb
         devid    8 size 1.36TB used 1.07TB path /dev/sda
         *** Some devices missing

Re: btrfs device delete missing problem

[Hugo Mills]

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On Fri, May 04, 2012 at 09:36:22PM -0400, Mark Murawski wrote:
> Using the latest mason git (and kernel 3.3.4)
> 
> stan {~} root# btrfs  filesystem show
> Label: none  uuid: d71404d4-468e-47d5-8f06-3b65fa7776aa
>         Total devices 2 FS bytes used 7.09GB
>         devid    2 size 9.31GB used 9.09GB path /dev/sdd6
>         devid    1 size 9.31GB used 9.09GB path /dev/sdg6
> 
> Label: none  uuid: b142f575-df1c-4a57-8846-a43b979e2e09
>         Total devices 9 FS bytes used 1.35TB
>         devid    8 size 1.36TB used 1.07TB path /dev/sda
>         devid    7 size 1.36TB used 1.07TB path /dev/sde
>         devid    2 size 465.76GB used 134.00GB path /dev/sdb
>         devid    4 size 149.05GB used 0.00 path /dev/sdc
>         devid    9 size 465.76GB used 161.00GB path /dev/sdf
>         devid    3 size 149.05GB used 0.00 path /dev/sdh
>         devid    5 size 920.34GB used 616.03GB path /dev/sdd7
>         devid    6 size 920.34GB used 616.03GB path /dev/sdg7
>         *** Some devices missing
> 
> stan {~} root# btrfs device delete missing /storage
> May  5 05:28:40 stan kernel: btrfs: relocating block group 0 flags 2
> stan {~} root#

   sync here, or btrfs fi sync /storage, or wait at least 30 seconds
for everything to be written out to disk.

> stan {~} root# btrfs  filesystem show
> Label: none  uuid: d71404d4-468e-47d5-8f06-3b65fa7776aa
>         Total devices 2 FS bytes used 7.09GB
>         devid    1 size 9.31GB used 9.09GB path /dev/sdg6
>         devid    2 size 9.31GB used 9.09GB path /dev/sdd6
> 
> Label: none  uuid: b142f575-df1c-4a57-8846-a43b979e2e09
>         Total devices 9 FS bytes used 1.35TB
>         devid    3 size 149.05GB used 0.00 path /dev/sdh
>         devid    6 size 920.34GB used 616.03GB path /dev/sdg7
>         devid    9 size 465.76GB used 161.00GB path /dev/sdf
>         devid    7 size 1.36TB used 1.07TB path /dev/sde
>         devid    5 size 920.34GB used 616.03GB path /dev/sdd7
>         devid    4 size 149.05GB used 0.00 path /dev/sdc
>         devid    2 size 465.76GB used 134.00GB path /dev/sdb
>         devid    8 size 1.36TB used 1.07TB path /dev/sda
>         *** Some devices missing

   btrfs fi show doesn't go through the kernel to get its information
-- it simply reads the data on the disks directly. This means that if
the kernel hasn't flushed changes to disk, btrfs fi show will be out
of date, as you've got here.

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
  PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
   --- The English language has the mot juste for every occasion. ---    

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