ext4:(
[209107.967673] md: data-check of RAID array md0
[209107.967682] md: minimum _guaranteed_ speed: 1000 KB/sec/disk.
[209107.967688] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check.
[209107.967698] md: using 128k window, over a total of 3913088 blocks.
[209114.635237] sd 0:0:0:0: [sdc] Unhandled sense code
[209114.635245] sd 0:0:0:0: [sdc] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[209114.635254] sd 0:0:0:0: [sdc] Sense Key : Medium Error [current]
[209114.635263] sd 0:0:0:0: [sdc] Add. Sense: Unrecovered read error
[209114.635272] sd 0:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 59 be 00 00 80 00
[209114.635291] end_request: I/O error, dev sdc, sector 88510
[209650.470944] md: md0: data-check done.
[315592.754256] sd 0:0:0:0: [sdc] Unhandled sense code
[315592.754264] sd 0:0:0:0: [sdc] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[315592.754272] sd 0:0:0:0: [sdc] Sense Key : Medium Error [current]
[315592.754281] sd 0:0:0:0: [sdc] Add. Sense: Unrecovered read error
[315592.754290] sd 0:0:0:0: [sdc] CDB: Read(10): 28 00 00 03 06 3e 00 00 08 00
[315592.754308] end_request: I/O error, dev sdc, sector 198206
[315592.754340] raid1: sdc1: rescheduling sector 198144
[315592.755268] raid1: sdd1: redirecting sector 198144 to another mirror
[401633.989756] EXT4-fs error (device md0): ext4_mb_generate_buddy: EXT4-fs: group 15: 5706 blocks in bitmap, 5691 in gd
[401633.989817] Aborting journal on device md0-8.
[401633.992711] EXT4-fs error (device md0): ext4_journal_start_sb: Detected aborted journal
[401633.992765] EXT4-fs (md0): Remounting filesystem read-only
[401634.200981] EXT4-fs (md0): Remounting filesystem read-only
[401634.414737] EXT4-fs (md0): delayed block allocation failed for inode 2159 at logical offset 2048 with max blocks 6665 with error -30
[401634.414788] EXT4-fs error (device md0) in ext4_da_write_end: IO failure
[401634.414829]
[401634.414833] This should not happen!! Data will be lost
[401634.420964] EXT4-fs (md0): ext4_da_writepages: jbd2_start: 6665 pages, ino 2159; err -30
[401634.421023]
[410614.845904] fuse exit
[410615.180896] nfsd: last server has exited, flushing export cache
[410619.779779] md: md0 still in use.
[410619.780062] md: md0 still in use.