From: Evert Vorster <evorster@gmail.com>
To: linux-btrfs@vger.kernel.org
Subject: Strangeness on btrfs balance..
Date: Sat, 5 Feb 2011 03:31:27 -0700 [thread overview]
Message-ID: <AANLkTin=G4c90Ew44gg=4E4joJPf6wizww=jqS0g8o1D@mail.gmail.com> (raw)
Hi there...
I have kernel version 2.6.36.3, compiled with gcc 4.4.5, btrfstools
version 0.19+20101101
I have a btrfs filesystem (/data) consisting of two 1TB hard disks, raid0.
I added in another 1TB hard drive.
root@X86-64:~# btrfs filesystem show
failed to read /dev/sdh
failed to read /dev/sdg
failed to read /dev/sdf
failed to read /dev/sde
failed to read /dev/sr0
failed to read /dev/fd0u800
failed to read /dev/fd0
Label: none uuid: 91a3ca88-7883-45a1-b83d-d95bf98a1d51
Total devices 3 FS bytes used 1.20TB
devid 3 size 931.51GB used 0.00 path /dev/sdb
devid 1 size 931.51GB used 889.15GB path /dev/sdc
devid 2 size 931.51GB used 889.13GB path /dev/sdd
Btrfs Btrfs v0.19
Sat Feb 05 03:22:29
root@X86-64:~#
----------------------------------------------------
So, I want to balance my data across these three devices, but I
noticed an inconsistencybteween "man btrfs" and btrfs' help...
root@X86-64:~# man btrfs | grep balance
btrfs device balance <path>
device balance <path>
Sat Feb 05 03:23:50
and
Sat Feb 05 03:24:19
root@X86-64:~# btrfs | grep balance
btrfs filesystem balance <path>
Sat Feb 05 03:24:20
According to the man page, to balance a filesystem, the command is:
btrfs device balance <path>
In my case: btrfs device balance /data
This returns an error:
root@X86-64:~# btrfs device balance /data
ERROR: unknown command 'device'
When I try with
btrfs filesystem balance /data, I can see data being read and written
to the two original disks, but the new disk is not getting written to.
I keep an eye on disk IO with gkrellm. Also, after about an hour of
balancing, /dev/sdb is still completely empty.
Any idea of why this is happening?
Last few lines of dmesg:
floppy0: disk absent or changed during operation
end_request: I/O error, dev fd0, sector 128
end_request: I/O error, dev fd0, sector 0
btrfs: found 69 extents
btrfs: relocating block group 1897465380864 flags 9
btrfs: found 95 extents
btrfs: found 95 extents
btrfs: relocating block group 1895317897216 flags 9
btrfs: found 81 extents
btrfs: found 81 extents
btrfs: relocating block group 1893170413568 flags 9
btrfs: found 93 extents
btrfs: found 93 extents
btrfs: relocating block group 1891022929920 flags 9
btrfs: found 96 extents
btrfs: found 96 extents
btrfs: relocating block group 1888875446272 flags 9
btrfs: found 93 extents
btrfs: found 93 extents
btrfs: relocating block group 1886727962624 flags 9
btrfs: found 90 extents
btrfs: found 90 extents
btrfs: relocating block group 1884580478976 flags 9
btrfs: found 99 extents
btrfs: found 99 extents
btrfs: relocating block group 1882432995328 flags 9
btrfs: found 1 extents
btrfs: found 1 extents
btrfs: relocating block group 1880285511680 flags 9
btrfs: found 101 extents
btrfs: found 101 extents
btrfs: relocating block group 1878138028032 flags 9
btrfs: found 105 extents
btrfs: found 105 extents
btrfs: relocating block group 1875990544384 flags 9
btrfs: found 82 extents
btrfs: found 82 extents
btrfs: relocating block group 1873843060736 flags 9
btrfs: found 344 extents
btrfs: found 344 extents
btrfs: relocating block group 1871695577088 flags 9
--
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next reply other threads:[~2011-02-05 10:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-05 10:31 Evert Vorster [this message]
2011-02-05 10:44 ` Strangeness on btrfs balance Felix Blanke
2011-02-05 11:34 ` Helmut Hullen
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