Hi,
I decided to try btrfs for a few file systems on my not-too-critical home
server, including my root fs. Most file systems are on a RAID5 MD software
array, but my rootfs is btrfs "striped" as RAID1 over 3 partitions.
I got hit by the Intel Sandy Bridge SATA chipset bug, so eventually the 3rd
SATA drive (/dev/sdc) failed with all kinds of bus errors. My btrfs rootfs
stayed up and working, but "btrfs device delete /dev/sdc3 /" did not work, and
gave a vague "Error removing device" (iirc). After rebooting with the drive on
the bad SATA bus removed, the file system didn't come up, but passing a "-o
degraded" fixed that. However, I was still not able to remove the missing
device from the rootfs. Neither "btrfs device delete missing /" nor "btrfs
device delete /dev/sdc3 /" succeeded. "btrfs fi balance /" succeeded without
errors however.
I'll paste the relevant bits of dmesg below. My btrfs rootfs is now mountable
and working in degraded mode, and I have a (daily rsynced) backup on another
filesystem anyway. I decided to report it anyway, as it would be good to get
things stable and this bug fixed. ;)
The running kernel is 2.6.38.4, and btrfs utils are version v0.19 (Ubuntu
Maverick).
dmesg:
[ 197.810007] device label root devid 1 transid 65058 /dev/sda3
[ 197.811844] btrfs: failed to read the system array on sda3
[ 197.876797] btrfs: open_ctree failed
[ 207.743237] device label root devid 1 transid 65058 /dev/sda3
[ 207.745460] btrfs: failed to read the system array on sda3
[ 207.793912] btrfs: open_ctree failed
[ 249.999918] device label backups devid 1 transid 7325 /dev/dm-4
[ 250.002555] device label root devid 2 transid 65058 /dev/sdb3
[ 250.003545] device label root devid 1 transid 65058 /dev/sda3
[ 488.217867] device label root devid 1 transid 65058 /dev/sda3
[ 488.218325] btrfs: allowing degraded mounts
[ 509.983121] btrfs: relocating block group 12108955648 flags 17
[ 513.096861] btrfs: found 695 extents
[ 520.176191] btrfs: found 695 extents
[ 520.888601] btrfs: relocating block group 11035213824 flags 17
[ 537.663032] btrfs: found 4836 extents
[ 550.237641] btrfs: found 4836 extents
[ 551.527503] btrfs: relocating block group 9961472000 flags 17
[ 556.314350] btrfs: found 1602 extents
[ 564.737818] btrfs: found 1602 extents
[ 565.358244] btrfs: relocating block group 9693036544 flags 20
[ 586.400905] btrfs: found 5548 extents
[ 586.773695] btrfs: relocating block group 8619294720 flags 17
[ 593.677386] btrfs: found 3839 extents
[ 599.059888] btrfs: found 3839 extents
[ 600.155579] btrfs: relocating block group 7545552896 flags 17
[ 612.330001] btrfs: found 3139 extents
[ 621.223148] btrfs: found 3139 extents
[ 622.054094] btrfs: relocating block group 6471811072 flags 17
[ 634.848723] btrfs: found 5541 extents
[ 649.045142] btrfs: found 5541 extents
[ 649.685956] btrfs: relocating block group 5398069248 flags 17
[ 663.123926] btrfs: found 12743 extents
[ 683.670746] btrfs: found 12743 extents
[ 684.595137] btrfs: relocating block group 4324327424 flags 17
[ 717.828652] btrfs: found 13762 extents
[ 740.723221] btrfs: found 13762 extents
[ 742.037898] btrfs: relocating block group 29360128 flags 20
[ 826.976047] btrfs: found 34862 extents
[ 827.084723] btrfs: relocating block group 20971520 flags 18
[ 827.126034] btrfs allocation failed flags 18, wanted 4096
[ 827.127621] space_info has 0 free, is not full
[ 827.127623] space_info total=12582912, used=4096, pinned=0, reserved=0,
may_use=0, readonly=12578816
[ 827.127626] block group 20971520 has 8388608 bytes, 4096 used 0 pinned 0
reserved
[ 827.127629] entry offset 20971520, bytes 4096, bitmap no
[ 827.129215] entry offset 20979712, bytes 8380416, bitmap no
[ 827.130778] block group has cluster?: no
[ 827.130780] 2 blocks of free space at or bigger than bytes is
[ 827.130782] block group 0 has 4194304 bytes, 0 used 0 pinned 0 reserved
[ 827.130784] entry offset 131072, bytes 4063232, bitmap no
[ 827.132340] block group has cluster?: no
[ 827.132342] 1 blocks of free space at or bigger than bytes is
[ 827.174753] btrfs: relocating block group 20971520 flags 18
[ 827.213303] btrfs allocation failed flags 18, wanted 4096
[ 827.214347] space_info has 0 free, is not full
[ 827.214348] space_info total=12582912, used=4096, pinned=0, reserved=0,
may_use=0, readonly=12578816
[ 827.214350] block group 20971520 has 8388608 bytes, 4096 used 0 pinned 0
reserved
[ 827.214352] entry offset 20971520, bytes 4096, bitmap no
[ 827.215367] entry offset 20979712, bytes 8380416, bitmap no
[ 827.216261] block group has cluster?: no
[ 827.216262] 2 blocks of free space at or bigger than bytes is
[ 827.216263] block group 0 has 4194304 bytes, 0 used 0 pinned 0 reserved
[ 827.216265] entry offset 131072, bytes 4063232, bitmap no
[ 827.217144] block group has cluster?: no
[ 827.217145] 1 blocks of free space at or bigger than bytes is
btrfs filesystem show:
Label: 'root' uuid: 9ff80426-d625-4601-b5db-28be1b556551
Total devices 3 FS bytes used 2.95GB
devid 2 size 18.63GB used 5.01GB path /dev/sdb3
devid 1 size 18.63GB used 5.00GB path /dev/sda3
*** Some devices missing
Please let me know if I can help by testing any commands / patches or by
providing additional details.
--
Mark--
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