On Wed, Aug 19, 2015 at 06:10:06PM +0200, Hendrik Friedel wrote: > Hello Hugo, > > thanks for your hint. > > On 16.08.2015 16:57, Hugo Mills wrote: > > Here's your problem -- you've got a RAID 5 filesystem, which has a > >minimum allocation of 2 devices, but only one device has free space on > >it for allocation, so no more chunks can be allocated. I'm not sure > >how it ended up in this situation, but that's what's happened. > > > >2) convert a few chunks of the existing FS, on devices 1 and 3, to > >single, which should free up some space across all the devices, and > >then run a full balance, and finally convert the single back to RAID > >5: > > > ># btrfs balance start -dconvert=single,devid=1,limit=4/mnt/__Complete_Disk > ># btrfs balance start -dconvert=single,devid=3,limit=4/mnt/__Complete_Disk > ># btrfs balance start -dprofiles=raid5/mnt/__Complete_Disk > ># btrfs balance start -dconvert=raid5,soft/mnt/__Complete_Disk > > > I did that. In order to run the first two commands I had to free > some space though, which was no problem. > > Now the output is: > root@homeserver:/media# btrfs fi df /mnt/__Complete_Disk > > Data, RAID5: total=3.79TiB, used=3.78TiB > System, RAID5: total=32.00MiB, used=416.00KiB > Metadata, RAID5: total=6.46GiB, used=4.85GiB > GlobalReserve, single: total=512.00MiB, used=0.00B > > root@homeserver:/media# btrfs fi show > Label: none uuid: a8af3832-48c7-4568-861f-e80380dd7e0b > Total devices 3 FS bytes used 3.79TiB > devid 1 size 2.73TiB used 2.43TiB path /dev/sdf > devid 2 size 2.73TiB used 2.43TiB path /dev/sdd > devid 3 size 2.73TiB used 1.38TiB path /dev/sde > > How can only 1.38TiB be used on devid 3?
It shouldn't happen, as I understand how the process works. Can you show the output of "btrfs fi df /mnt/__Complete_Disk"? Let's just check that everything is indeed RAID-5 still. After this, we're probably going to have to look at the device and chunk trees to work out what's going on. Hugo. -- Hugo Mills | "I lost my leg in 1942. Some bastard stole it in a hugo@... carfax.org.uk | pub in Pimlico." http://carfax.org.uk/ | PGP: E2AB1DE4 |
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