FYI - after a failed disk and replacing it I've run a balance; it took
almost 3 weeks to complete, for 120 GBs of data:
# time btrfs balance start -v /home
Dumping filters: flags 0x7, state 0x0, force is off
DATA (flags 0x0): balancing
METADATA (flags 0x0): balancing
SYSTEM (flags 0x0): balancing
Done, had to relocate 124 out of 124 chunks
real 30131m52.873s
user 0m0.000s
sys 74m59.180s
Kernel is 3.17.0-rc7.
Filesystem is not that big, merely 124 GB used out of 1.8 TB:
/dev/sdb4 1.8T 124G 1.6T
8% /home
# btrfs fi df /home
Data, RAID1: total=121.00GiB, used=117.56GiB
System, RAID1: total=32.00MiB, used=48.00KiB
Metadata, RAID1: total=8.00GiB, used=4.99GiB
GlobalReserve, single: total=512.00MiB, used=0.00
# btrfs fi show /home
Label: none uuid: 84d087aa-3a32-46da-844f-a233237cf04f
Total devices 2 FS bytes used 122.56GiB
devid 2 size 1.71TiB used 129.03GiB path /dev/sdb4
devid 3 size 1.71TiB used 129.03GiB path /dev/sda4
The only special thing about this filesystem is that there are ~250
snapshots there:
# btrfs sub list /home|wc -l
253
It's using compression:
/dev/sdb4 on /home type btrfs (rw,noatime,compress=lzo,space_cache)
Other than taking occasional backups from remote, the server is idle.
# hdparm -t /dev/sda /dev/sdb
/dev/sda:
Timing buffered disk reads: 394 MB in 3.01 seconds = 131.03 MB/sec
/dev/sdb:
Timing buffered disk reads: 402 MB in 3.00 seconds = 133.86 MB/sec
How long does the balance take for others with "many" snapshots?
--
Tomasz Chmielewski
http://www.sslrack.com
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