Playing around with this filesystem I hot-removed a device from the
array and put in a replacement.
Label: 'Root' uuid: d71404d4-468e-47d5-8f06-3b65fa7776aa
Total devices 2 FS bytes used 7.43GiB
devid 1 size 9.31GiB used 8.90GiB path /dev/sdc6
devid 3 size 9.31GiB used 8.90GiB path
/dev/disk/by-uuid/d71404d4-468e-47d5-8f06-3b65fa7776aa
<removed /dev/sdc>
Label: 'Root' uuid: d71404d4-468e-47d5-8f06-3b65fa7776aa
Total devices 2 FS bytes used 7.43GiB
devid 3 size 9.31GiB used 8.90GiB path
/dev/disk/by-uuid/d71404d4-468e-47d5-8f06-3b65fa7776aa
*** Some devices missing
cartman {~} root# btrfs device add /dev/sdi6 /
cartman {~} root# btrfs fi show
Label: 'Root' uuid: d71404d4-468e-47d5-8f06-3b65fa7776aa
Total devices 3 FS bytes used 7.43GiB
devid 3 size 9.31GiB used 8.90GiB path
/dev/disk/by-uuid/d71404d4-468e-47d5-8f06-3b65fa7776aa
devid 4 size 10.00GiB used 0.00 path /dev/sdi6
*** Some devices missing
cartman {~} root# btrfs filesystem balance start /
Sep 16 12:47:12 localhost kernel: BTRFS: bdev /dev/sdc6 errs: wr 2411,
rd 0, flush 38, corrupt 137167, gen 25
Sep 16 12:47:12 localhost kernel: BTRFS: bdev /dev/sdc6 errs: wr 2412,
rd 0, flush 38, corrupt 137167, gen 25
Sep 16 12:47:12 localhost kernel: BTRFS: bdev /dev/sdc6 errs: wr 2413,
rd 0, flush 38, corrupt 137167, gen 25
Sep 16 12:47:12 localhost kernel: BTRFS: bdev /dev/sdc6 errs: wr 2414,
rd 0, flush 38, corrupt 137167, gen 25
Sep 16 12:47:12 localhost kernel: BTRFS: bdev /dev/sdc6 errs: wr 2415,
rd 0, flush 38, corrupt 137167, gen 25
Sep 16 12:47:12 localhost kernel: BTRFS: bdev /dev/sdc6 errs: wr 2416,
rd 0, flush 38, corrupt 137167, gen 25
Sep 16 12:47:12 localhost kernel: BTRFS: bdev /dev/sdc6 errs: wr 2417,
rd 0, flush 38, corrupt 137167, gen 25
Sep 16 12:47:12 localhost kernel: BTRFS: bdev /dev/sdc6 errs: wr 2418,
rd 0, flush 38, corrupt 137167, gen 25
Sep 16 12:47:12 localhost kernel: BTRFS: bdev /dev/sdc6 errs: wr 2419,
rd 0, flush 38, corrupt 137167, gen 25
Sep 16 12:47:12 localhost kernel: BTRFS: bdev /dev/sdc6 errs: wr 2420,
rd 0, flush 38, corrupt 137167, gen 25
Sep 16 12:47:14 localhost kernel: BTRFS: lost page write due to I/O
error on /dev/sdc6
Sep 16 12:47:14 localhost kernel: BTRFS: lost page write due to I/O
error on /dev/sdc6
Sep 16 12:47:14 localhost kernel: BTRFS info (device sdd6): found 59023
extents
Sep 16 12:47:14 localhost kernel: use_block_rsv: 4 callbacks suppressed
Sep 16 12:47:14 localhost kernel: ------------[ cut here ]------------
Sep 16 12:47:14 localhost kernel: WARNING: CPU: 1 PID: 5109 at
fs/btrfs/extent-tree.c:7273 btrfs_alloc_free_block+0x455/0x4a0()
Sep 16 12:47:14 localhost kernel: BTRFS: block rsv returned -28
Sep 16 12:47:14 localhost kernel: Modules linked in:
Sep 16 12:47:14 localhost kernel: CPU: 1 PID: 5109 Comm: tail Tainted: G
W 3.16.1 #2
Sep 16 12:47:14 localhost kernel: Hardware name: Gigabyte Technology
Co., Ltd. GA-MA74GM-S2/GA-MA74GM-S2, BIOS F1 04/17/2008
Sep 16 12:47:14 localhost kernel: 0000000000000000 ffffffff819e3610
ffffffff817e4409 ffff88005a9eba68
Sep 16 12:47:14 localhost kernel: ffffffff8106f6f2 ffff8800379fe980
ffff880073a70000 0000000000001000
Sep 16 12:47:14 localhost kernel: ffff88001fc635a0 ffff8800747b6000
ffffffff8106f7d5 ffffffff819f5978
Sep 16 12:47:14 localhost kernel: Call Trace:
Sep 16 12:47:14 localhost kernel: [<ffffffff817e4409>] ?
dump_stack+0x49/0x6a
Sep 16 12:47:14 localhost kernel: [<ffffffff8106f6f2>] ?
warn_slowpath_common+0x82/0xb0
Sep 16 12:47:14 localhost kernel: [<ffffffff8106f7d5>] ?
warn_slowpath_fmt+0x45/0x50
Sep 16 12:47:14 localhost kernel: [<ffffffff8135f074>] ?
___ratelimit+0x94/0x100
Sep 16 12:47:14 localhost kernel: [<ffffffff81296625>] ?
btrfs_alloc_free_block+0x455/0x4a0
Sep 16 12:47:14 localhost kernel: [<ffffffff810992b7>] ?
set_next_entity+0x37/0x80
Sep 16 12:47:14 localhost kernel: [<ffffffff812ca111>] ?
read_extent_buffer+0xb1/0x110
Sep 16 12:47:14 localhost kernel: [<ffffffff81091de9>] ?
finish_task_switch+0x49/0xe0
Sep 16 12:47:14 localhost kernel: [<ffffffff81280d9f>] ?
btrfs_copy_root+0xef/0x2a0
Sep 16 12:47:14 localhost kernel: [<ffffffff812f1853>] ?
create_reloc_root+0x1e3/0x2a0
Sep 16 12:47:14 localhost kernel: [<ffffffff812f7848>] ?
btrfs_init_reloc_root+0xb8/0xd0
Sep 16 12:47:14 localhost kernel: [<ffffffff812a708f>] ?
record_root_in_trans+0xaf/0x110
Sep 16 12:47:14 localhost kernel: [<ffffffff812a8496>] ?
btrfs_record_root_in_trans+0x46/0x80
Sep 16 12:47:14 localhost kernel: [<ffffffff812a98fc>] ?
start_transaction+0x8c/0x4f0
Sep 16 12:47:14 localhost kernel: [<ffffffff812b1168>] ?
btrfs_dirty_inode+0x58/0xe0
Sep 16 12:47:14 localhost kernel: [<ffffffff8113b382>] ?
touch_atime+0x152/0x160
Sep 16 12:47:14 localhost kernel: [<ffffffff810e3eb5>] ?
generic_file_read_iter+0x545/0x5a0
Sep 16 12:47:14 localhost kernel: [<ffffffff810a1d49>] ?
remove_wait_queue+0x19/0x60
Sep 16 12:47:14 localhost kernel: [<ffffffff810a1bc4>] ?
prepare_to_wait+0x24/0x90
Sep 16 12:47:14 localhost kernel: [<ffffffff81122493>] ?
new_sync_read+0x73/0xa0
Sep 16 12:47:14 localhost kernel: [<ffffffff811230ae>] ? vfs_read+0x9e/0x170
Sep 16 12:47:14 localhost kernel: [<ffffffff8112332f>] ? SyS_read+0x4f/0xd0
Sep 16 12:47:14 localhost kernel: [<ffffffff817eae12>] ?
system_call_fastpath+0x16/0x1b
Sep 16 12:47:14 localhost kernel: ---[ end trace 0662903316baa365 ]---
Sep 16 12:47:14 localhost kernel: BTRFS: lost page write due to I/O
error on /dev/sdc6
Sep 16 12:47:14 localhost kernel: BTRFS: lost page write due to I/O
error on /dev/sdc6
Sep 16 12:47:14 localhost kernel: BTRFS: lost page write due to I/O
error on /dev/sdc6
On 09/16/14 12:37, Duncan wrote:
Mark Murawski posted on Mon, 15 Sep 2014 22:23:47 -0400 as excerpted:
I wish i could follow your procedure, but this wasn't an ext conversion.
I made this with mkfs for btrfs with kernel circa 3.8ish
Good. That possible corner-case is eliminated. then. I had seen nothing
indicating it might apply, but better to find that out now than to spend
days tearing hair out trying to trace it down, only to discover it's that
one already known corner-case! =:^)
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