hi, buddy I have a file server with btrfs file system, it's work well for several months.
but after last system reboot, the /dev/sdb become not mountable. below is the details. is there any advise? ######Version info Fedora 25 Server Kernel 4.9.13-201.fc25.x86_64 btrfs-progs v4.6.1 #####error messages when mount mount: wrong fs type, bad option, bad superblock on /dev/sdb, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so. ######dmesg |tail [79570.756871] BTRFS error (device sdb): parent transid verify failed on 21413888 wanted 755660 found 623605 [79570.762307] BTRFS error (device sdb): bad tree block start 0 21413888 [79570.762345] BTRFS error (device sdb): failed to read chunk tree: -5 [79570.778129] BTRFS error (device sdb): open_ctree failed [79589.743772] BTRFS error (device sdb): support for check_integrity* not compiled in! [79589.803176] BTRFS error (device sdb): open_ctree failed ######btrfsck parent transid verify failed on 21413888 wanted 755660 found 623605 parent transid verify failed on 21413888 wanted 755660 found 623605 checksum verify failed on 21413888 found E4E3BDB6 wanted 00000000 parent transid verify failed on 21413888 wanted 755660 found 623605 Ignoring transid failure checksum verify failed on 21331968 found E4E3BDB6 wanted 00000000 checksum verify failed on 21331968 found E4E3BDB6 wanted 00000000 checksum verify failed on 21692416 found E4E3BDB6 wanted 00000000 checksum verify failed on 21692416 found E4E3BDB6 wanted 00000000 checksum verify failed on 22888448 found E4E3BDB6 wanted 00000000 checksum verify failed on 22888448 found E4E3BDB6 wanted 00000000 checksum verify failed on 22888448 found E4E3BDB6 wanted 00000000 checksum verify failed on 22888448 found E4E3BDB6 wanted 00000000 bytenr mismatch, want=22888448, have=0 Couldn't read chunk tree Couldn't open file system ######btrfs-find-root parent transid verify failed on 21413888 wanted 755660 found 623605 parent transid verify failed on 21413888 wanted 755660 found 623605 parent transid verify failed on 21413888 wanted 755660 found 623605 Ignoring transid failure Couldn't read chunk tree ERROR: open ctree failed ######btrfs-show-super -a /dev/sdb superblock: bytenr=65536, device=/dev/sdb --------------------------------------------------------- csum 0xb6f3ccb1 [match] bytenr 65536 flags 0x1 ( WRITTEN ) magic _BHRfS_M [match] fsid 7f5aecd6-40fe-45ce-90c3-e86bacc4bf6f label samba_fs generation 770740 root 16187774615552 sys_array_size 355 chunk_root_generation 755799 root_level 1 chunk_root 24331161698304 chunk_root_level 1 log_root 0 log_root_transid 0 log_root_level 0 total_bytes 23999996231680 bytes_used 22205028102144 sectorsize 4096 nodesize 16384 leafsize 16384 stripesize 4096 root_dir 6 num_devices 1 compat_flags 0x0 compat_ro_flags 0x0 incompat_flags 0x169 ( MIXED_BACKREF | COMPRESS_LZO | BIG_METADATA | EXTENDED_IREF | SKINNY_METADATA ) csum_type 0 csum_size 4 cache_generation 770740 uuid_tree_generation 770740 dev_item.uuid dd8c8d66-b6f5-48d8-9d5e-6f56b2ad4751 dev_item.fsid 7f5aecd6-40fe-45ce-90c3-e86bacc4bf6f [match] dev_item.type 0 dev_item.total_bytes 23999996231680 dev_item.bytes_used 23274943676416 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 superblock: bytenr=67108864, device=/dev/sdb --------------------------------------------------------- csum 0x1692e47f [match] bytenr 67108864 flags 0x1 ( WRITTEN ) magic _BHRfS_M [match] fsid 7f5aecd6-40fe-45ce-90c3-e86bacc4bf6f label samba_fs generation 770740 root 16187774615552 sys_array_size 355 chunk_root_generation 755799 root_level 1 chunk_root 24331161698304 chunk_root_level 1 log_root 0 log_root_transid 0 log_root_level 0 total_bytes 23999996231680 bytes_used 22205028102144 sectorsize 4096 nodesize 16384 leafsize 16384 stripesize 4096 root_dir 6 num_devices 1 compat_flags 0x0 compat_ro_flags 0x0 incompat_flags 0x169 ( MIXED_BACKREF | COMPRESS_LZO | BIG_METADATA | EXTENDED_IREF | SKINNY_METADATA ) csum_type 0 csum_size 4 cache_generation 770740 uuid_tree_generation 770740 dev_item.uuid dd8c8d66-b6f5-48d8-9d5e-6f56b2ad4751 dev_item.fsid 7f5aecd6-40fe-45ce-90c3-e86bacc4bf6f [match] dev_item.type 0 dev_item.total_bytes 23999996231680 dev_item.bytes_used 23274943676416 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 superblock: bytenr=274877906944, device=/dev/sdb --------------------------------------------------------- csum 0xeb15b24e [match] bytenr 274877906944 flags 0x1 ( WRITTEN ) magic _BHRfS_M [match] fsid 7f5aecd6-40fe-45ce-90c3-e86bacc4bf6f label samba_fs generation 770740 root 16187774615552 sys_array_size 355 chunk_root_generation 755799 root_level 1 chunk_root 24331161698304 chunk_root_level 1 log_root 0 log_root_transid 0 log_root_level 0 total_bytes 23999996231680 bytes_used 22205028102144 sectorsize 4096 nodesize 16384 leafsize 16384 stripesize 4096 root_dir 6 num_devices 1 compat_flags 0x0 compat_ro_flags 0x0 incompat_flags 0x169 ( MIXED_BACKREF | COMPRESS_LZO | BIG_METADATA | EXTENDED_IREF | SKINNY_METADATA ) csum_type 0 csum_size 4 cache_generation 770740 uuid_tree_generation 770740 dev_item.uuid dd8c8d66-b6f5-48d8-9d5e-6f56b2ad4751 dev_item.fsid 7f5aecd6-40fe-45ce-90c3-e86bacc4bf6f [match] dev_item.type 0 dev_item.total_bytes 23999996231680 dev_item.bytes_used 23274943676416 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 -- Best Regards YunFu Li System Engineer Chengdu Kanghong Pharmaceuticals Group Co., Ltd No. 36, Shu XiRoad, Chengdu, Sichuan Province, China Ext.:4004 | 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