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root@david-GA-MA78LM-S2H:~# dmesg | grep md0
[  247.597955] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 201326592 size 8388608 starting block 89082882)
[  247.597962] Buffer I/O error on device md0, logical block 267247616
[  247.597971] Buffer I/O error on device md0, logical block 267247617
[  247.597976] Buffer I/O error on device md0, logical block 267247618
[  247.597981] Buffer I/O error on device md0, logical block 267247619
[  247.597986] Buffer I/O error on device md0, logical block 267247620
[  247.597990] Buffer I/O error on device md0, logical block 267247621
[  247.597995] Buffer I/O error on device md0, logical block 267247622
[  247.597999] Buffer I/O error on device md0, logical block 267247623
[  247.598004] Buffer I/O error on device md0, logical block 267247624
[  247.598009] Buffer I/O error on device md0, logical block 267247625
[  247.598207] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 201326592 size 8388608 starting block 89083010)
[  247.598433] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 201326592 size 8388608 starting block 89083138)
[  247.598650] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 201326592 size 8388608 starting block 89083266)
[  247.598851] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 201326592 size 8388608 starting block 89083394)
[  247.599048] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 201326592 size 8388608 starting block 89083522)
[  247.599267] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 209715200 size 8388608 starting block 89083650)
[  247.599772] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 209715200 size 8388608 starting block 89083778)
[  247.599977] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 209715200 size 8388608 starting block 89083906)
[  247.600352] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 209715200 size 8388608 starting block 89084034)
[  276.576473] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 1249902592 size 3670016 starting block 89752578)
[  276.576483] Buffer I/O error on device md0, logical block 269256704
[  276.576493] Buffer I/O error on device md0, logical block 269256705
[  276.576498] Buffer I/O error on device md0, logical block 269256706
[  276.576502] Buffer I/O error on device md0, logical block 269256707
[  276.576507] Buffer I/O error on device md0, logical block 269256708
[  276.576512] Buffer I/O error on device md0, logical block 269256709
[  276.576517] Buffer I/O error on device md0, logical block 269256710
[  276.576522] Buffer I/O error on device md0, logical block 269256711
[  276.576527] Buffer I/O error on device md0, logical block 269256712
[  276.576531] Buffer I/O error on device md0, logical block 269256713
[  276.576744] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 1249902592 size 3670016 starting block 89752706)
[  276.576953] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 1249902592 size 3670016 starting block 89752834)
[  279.716194] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 1253572608 size 4718592 starting block 89752962)
[  279.716431] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 1253572608 size 4718592 starting block 89753090)
[  279.716637] EXT4-fs warning (device md0): ext4_end_bio:317: I/O error writing to inode 83886358 (offset 1253572608 size 4718592 starting block 89753218)
[  279.719821] Aborting journal on device md0-8.
[  279.720474] EXT4-fs (md0): Delayed block allocation failed for inode 83886358 at logical offset 309248 with max blocks 1920 with error 30
[  279.720480] EXT4-fs (md0): This should not happen!! Data will be lost
[  279.720487] EXT4-fs error (device md0) in ext4_writepages:2536: Journal has aborted
[  279.797422] EXT4-fs error (device md0): ext4_journal_check_start:56: Detected aborted journal
[  279.797431] EXT4-fs (md0): Remounting filesystem read-only
[  316.363004] EXT4-fs (md0): error count: 200
[  316.363016] EXT4-fs (md0): initial error at 1452234554: ext4_journal_check_start:56
[  316.363024] EXT4-fs (md0): last error at 1457194349: ext4_journal_check_start:56