From mboxrd@z Thu Jan 1 00:00:00 1970 From: Evert Vorster Subject: Strangeness on btrfs balance.. Date: Sat, 5 Feb 2011 03:31:27 -0700 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 To: linux-btrfs@vger.kernel.org Return-path: List-ID: 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 device balance Sat Feb 05 03:23:50 and Sat Feb 05 03:24:19 root@X86-64:~# btrfs | grep balance btrfs filesystem balance Sat Feb 05 03:24:20 According to the man page, to balance a filesystem, the command is: btrfs device balance 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 -- http://magnatune.com - Music shared the way it should be.