Hello!
I have a CentOS 7 box with 4 HDD (3x1Tb and 1x2Tb) in soft RAID-5 made with mdadm and btrfs over this.
Once I was need to remove my 2Tb disk from box and at this time SATA cable of 1Tb disk was failed.
I’ve done it on turned off machine, 2Tb disk was remoced by «mdadm —fail; mdadm --remove» and after turning machine on my RAID-array was inactive with 2 disks. I’ve replaced cable. assembled array, but my BTRFS is crashed.
Please, help me to recover files from my disks - there are some very important photos for me.
$ uname -a
Linux server.local 3.10.0-229.7.2.el7.x86_64 #1 SMP Tue Jun 23 22:06:11 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
$ btrfs --version
Btrfs v3.16.2
$ ./btrfs --version
btrfs-progs v4.1.2
$ sudo btrfs fi show
Label: none uuid: 63a98c84-d857-45bf-a13f-68e00e1bd3e4
Total devices 1 FS bytes used 1.54TiB
devid 1 size 2.73TiB used 1.55TiB path /dev/md0
$ sudo ./btrfs check /dev/md0
checksum verify failed on 21053440 found 9F31D50C wanted 300A0D31
checksum verify failed on 21053440 found 9F31D50C wanted 300A0D31
checksum verify failed on 21053440 found 166E9CB1 wanted BE59B4B7
checksum verify failed on 21053440 found 9F31D50C wanted 300A0D31
bytenr mismatch, want=21053440, have=17447212025753641184
Couldn't read chunk root
Couldn't open file system
$ sudo btrfs rescue chunk-recover /dev/md0
scan chunk headers error
Abort to rebuild the on-disk chunk tree.
$ sudo ./btrfs-find-root /dev/md0
Couldn't read chunk root
Open ctree failed
$ sudo ./btrfs rescue super-recover /dev/md0
ctree.h:2021: btrfs_super_csum_size: Assertion `t >= ARRAY_SIZE(btrfs_csum_sizes)` failed.
./btrfs[0x434260]
./btrfs(btrfs_recover_superblocks+0x136)[0x4344e8]
./btrfs(cmd_super_recover+0x102)[0x42f0b4]
./btrfs(handle_command_group+0x5d)[0x409d8f]
./btrfs(cmd_rescue+0x15)[0x42f3b1]
./btrfs(main+0x153)[0x409ee7]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x7f2b80771af5]
./btrfs[0x409aa9]
$ sudo ./btrfs-show-super /dev/md0
superblock: bytenr=65536, device=/dev/md0
---------------------------------------------------------
csum 0x51a27ea6 [match]
bytenr 65536
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid 63a98c84-d857-45bf-a13f-68e00e1bd3e4
label
generation 1010
root 1381383192576
sys_array_size 226
chunk_root_generation 960
root_level 1
chunk_root 21053440
chunk_root_level 1
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 3000211341312
bytes_used 1696763748352
sectorsize 4096
nodesize 16384
leafsize 16384
stripesize 4096
root_dir 6
num_devices 1
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x61
( MIXED_BACKREF |
BIG_METADATA |
EXTENDED_IREF )
csum_type 0
csum_size 4
cache_generation 1010
uuid_tree_generation 1010
dev_item.uuid 5b484f94-efec-4d9a-97a2-2c35614c133f
dev_item.fsid 63a98c84-d857-45bf-a13f-68e00e1bd3e4 [match]
dev_item.type 0
dev_item.total_bytes 3000211341312
dev_item.bytes_used 1701918539776
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
__
Aleksey Trifonov
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