2011-04-06 12:43:50 +0100, Stephane Chazelas:
[...]
> The rate is going down. It's now down to about 14kB/s
>
> [658654.295752] btrfs: relocating block group 3919858106368 flags 20
> [671932.913235] btrfs: relocating block group 3919589670912 flags 20
> [686189.296126] btrfs: relocating block group 3919321235456 flags 20
> [701511.523990] btrfs: relocating block group 3919052800000 flags 20
> [718591.316339] btrfs: relocating block group 3918784364544 flags 20
> [725567.081031] btrfs: relocating block group 3918515929088 flags 20
> [744415.011581] btrfs: relocating block group 3918247493632 flags 20
> [762365.021458] btrfs: relocating block group 3917979058176 flags 20
> [780504.726067] btrfs: relocating block group 3917710622720 flags 20
[...]
> At this rate, the balancing would be over in about 8 years.
[...]
Hurray! The btrfs balance eventually ran through after almost exactly 2 weeks.
It didn't get down to 0:
[1189505.152717] btrfs: found 60527 extents
[1189505.440565] btrfs: relocating block group 3910731300864 flags 20
[1199805.071045] btrfs: found 60235 extents
[1199805.447821] btrfs: relocating block group 3910462865408 flags 20
[1207914.737372] btrfs: found 58039 extents
iostat reckons 9TB have been written to disk in the whole
process (4.5TB read from them (!?)).
There hasn't been any change in allocation though:
# df -h /backup
Filesystem Size Used Avail Use% Mounted on
/dev/sda4 8.2T 3.5T 3.2T 53% /backup
# btrfs fi df /backup
Data, RAID0: total=3.42TB, used=3.41TB
System, RAID1: total=16.00MB, used=228.00KB
Metadata, RAID1: total=28.00GB, used=20.47GB
# btrfs fi show
Label: none uuid: a0ae35c4-51f2-405f-a4bb-e4f134b1d193
Total devices 3 FS bytes used 3.43TB
devid 4 size 2.73TB used 1.17TB path /dev/sdc
devid 3 size 2.73TB used 1.17TB path /dev/sdb
devid 2 size 2.70TB used 1.14TB path /dev/sda4
Btrfs Btrfs v0.19
Still 1.5TB missing.
--
Stephane
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