I try mount with -o degraded but this same effect what recovery:
[ 7133.926778] BTRFS info (device sdc): allowing degraded mounts
[ 7133.926783] BTRFS info (device sdc): disk space caching is enabled
[ 7133.932140] BTRFS info (device sdc): bdev (null) errs: wr 921, rd
164889, flush 0, corrupt 0, gen 0
[ 7133.993146] BTRFS error (device sdc): bad tree block start 0 1619525632
[ 7133.993185] BTRFS: Failed to read block groups: -5
[ 7134.002111] BTRFS: open_ctree failed
Do you suggest to return for stable kernel on centos? ( 3.10 )
W dniu 2016-03-18 o 19:02, Hugo Mills pisze:
The main thing you haven't tried here is mount -o degraded, which
is the thing to do if you have a missing device in your array.
Also, that kernel's not really all that good for a parity RAID
array -- it's the very first one that had the scrub and replace
implementation, so it's rather less stable with parity RAID than the
later 4.x kernels. That's probably not the issue here, though.
Hugo.
On Fri, Mar 18, 2016 at 06:41:32PM +0100, Marcin Solecki wrote:
Hello all,
I give up for this problem at restore my data
# uname -a
Linux jarvis.home 4.5.0-1.el7.elrepo.x86_64
# btrfs --version
btrfs-progs v3.19.1
# btrfs fi show
warning, device 4 is missing
bytenr mismatch, want=21020672, have=21217280
Couldn't read chunk root
Label: none uuid: 27ef2638-b50a-4243-80ed-40c3733ec11d
Total devices 4 FS bytes used 2.50TiB
devid 1 size 931.51GiB used 899.71GiB path /dev/sdd
devid 2 size 931.51GiB used 899.69GiB path /dev/sdb
devid 3 size 931.51GiB used 899.69GiB path /dev/sdc
*** Some devices missing
# mount -o recovery /dev/sda /srv/
mount: wrong fs type, bad option, bad superblock on /dev/sda,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
dmesg after :
[ 4886.521315] BTRFS info (device sdc): enabling auto recovery
[ 4886.521320] BTRFS info (device sdc): disk space caching is enabled
[ 4886.522853] BTRFS: failed to read chunk tree on sdc
[ 4886.528789] BTRFS: open_ctree failed
#btrfs check --repair /dev/sda
enabling repair mode
warning, device 4 is missing
bytenr mismatch, want=21020672, have=21217280
Couldn't read chunk root
Couldn't open file system
# btrfs rescue chunk-recover -v /dev/sda
All Devices:
Device: id = 3, name = /dev/sdc
Device: id = 2, name = /dev/sdb
Device: id = 1, name = /dev/sda
[ 5164.468272] btrfs[3653]: segfault at 7f454014172e ip
0000000000423479 sp 00007f4482cec880 error 4 in btrfs[400000+83000]
[ 5168.928317] btrfs[3657]: segfault at 7fd18c14172e ip
0000000000423479 sp 00007fd0d5858880 error 4 in btrfs[400000+83000]
[ 5173.812457] btrfs[3662]: segfault at 7fd76c14172e ip
0000000000423479 sp 00007fd6b0e59880 error 4 in btrfs[400000+83000]
# btrfs rescue super-recover -v /dev/sda
All Devices:
Device: id = 3, name = /dev/sdc
Device: id = 2, name = /dev/sdb
Device: id = 1, name = /dev/sda
Before Recovering:
[All good supers]:
device name = /dev/sdc
superblock bytenr = 65536
device name = /dev/sdc
superblock bytenr = 67108864
device name = /dev/sdc
superblock bytenr = 274877906944
device name = /dev/sdb
superblock bytenr = 65536
device name = /dev/sdb
superblock bytenr = 67108864
device name = /dev/sdb
superblock bytenr = 274877906944
device name = /dev/sda
superblock bytenr = 65536
device name = /dev/sda
superblock bytenr = 67108864
device name = /dev/sda
superblock bytenr = 274877906944
[All bad supers]:
All supers are valid, no need to recover
# btrfs-show-super /dev/sda
superblock: bytenr=65536, device=/dev/sda
---------------------------------------------------------
csum 0x61b509bb [match]
bytenr 65536
flags 0x1
magic _BHRfS_M [match]
fsid 27ef2638-b50a-4243-80ed-40c3733ec11d
label
generation 69462
root 1648640000
sys_array_size 290
chunk_root_generation 48545
root_level 1
chunk_root 21020672
chunk_root_level 1
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 4000819544064
bytes_used 2743528714240
sectorsize 4096
nodesize 16384
leafsize 16384
stripesize 4096
root_dir 6
num_devices 4
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0xe1
( MIXED_BACKREF |
BIG_METADATA |
EXTENDED_IREF |
RAID56 )
csum_type 0
csum_size 4
cache_generation 69462
uuid_tree_generation 69462
dev_item.uuid 70f4650c-e01d-4613-bd7a-a6834c1c44bb
dev_item.fsid 27ef2638-b50a-4243-80ed-40c3733ec11d [match]
dev_item.type 0
dev_item.total_bytes 1000204886016
dev_item.bytes_used 966057263104
dev_item.io_align 4096
dev_item.io_width 4096
dev_item.sector_size 4096
dev_item.devid 1
dev_item.dev_group 0
dev_item.seek_speed 0
dev_item.bandwidth 0
dev_item.generation 0
thx for helps
--
Pozdrawiam Marcin Solecki
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