Hello, Continuing on the dangerous and exciting journey with trying to upgrade my system from a 3.7.10 kernel to 3.8.7, I face the following problem. In a RAID1 array of an SSD and a HDD marked as write-mostly, mdadm at some point just randomly decides that a device has failed, despite NO dmesg messages that would confirm that anything at all happened to the device (at 133s). Then I notice this, remove(413s) and re-add(418s) the device. It starts rebuilding, but just after 10 seconds, "fails" again! (428s). This can repeat and repeat, I can't readd it and have it rebuild successfully. If a device truly failed in some way, I'd expect dmesg errors from e.g. the ATA layer, etc. But there is none; also what leads me to suspicion that this is some sort of a bug, is the fact that this same array works perfectly on the older (3.7.10) kernel. ... [ 22.984532] r8169 0000:04:00.0 eth0: link up [ 22.984541] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready [ 22.984584] IPv6: ADDRCONF(NETDEV_CHANGE): eth0.2: link becomes ready [ 22.996464] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory [ 22.996712] NFSD: starting 90-second grace period (net ffffffff81cb36c0) [ 41.315150] ata1.00: configured for UDMA/133 [ 41.315164] ata1: EH complete [ 41.329004] ata2.00: configured for UDMA/133 [ 41.329019] ata2: EH complete [ 41.330625] ata3.00: configured for UDMA/133 [ 41.330640] ata3: EH complete [ 41.333116] ata4.00: configured for UDMA/133 [ 41.333130] ata4: EH complete [ 41.335766] ata5.00: configured for UDMA/133 [ 41.335781] ata5: EH complete [ 41.356118] ata7.00: configured for UDMA/133 [ 41.356133] ata7: EH complete [ 41.362298] ata12.00: configured for UDMA/133 [ 41.362313] ata12: EH complete [ 41.362483] ata13.00: configured for UDMA/133 [ 41.362491] ata13: EH complete [ 41.369409] ata11.00: configured for UDMA/133 [ 41.369424] ata11: EH complete [ 133.191756] md/raid1:md3: Disk failure on sdg1, disabling device. [ 133.191756] md/raid1:md3: Operation continuing on 1 devices. [ 133.194892] RAID1 conf printout: [ 133.194901] --- wd:1 rd:2 [ 133.194906] disk 0, wo:0, o:1, dev:sdf1 [ 133.194911] disk 1, wo:1, o:0, dev:sdg1 [ 133.198199] RAID1 conf printout: [ 133.198213] --- wd:1 rd:2 [ 133.198219] disk 0, wo:0, o:1, dev:sdf1 [ 413.692816] md: unbind<sdg1> [ 413.692863] md: export_rdev(sdg1) [ 413.718257] device label home devid 1 transid 568912 /dev/md3 [ 418.696848] md: bind<sdg1> [ 418.699066] RAID1 conf printout: [ 418.699074] --- wd:1 rd:2 [ 418.699080] disk 0, wo:0, o:1, dev:sdf1 [ 418.699085] disk 1, wo:1, o:1, dev:sdg1 [ 418.704862] md: recovery of RAID array md3 [ 418.704873] md: minimum _guaranteed_ speed: 1000 KB/sec/disk. [ 418.704879] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for recovery. [ 418.704888] md: using 128k window, over a total of 58579264k. [ 418.763888] device label home devid 1 transid 568912 /dev/md3 [ 428.464670] md/raid1:md3: Disk failure on sdg1, disabling device. [ 428.464670] md/raid1:md3: Operation continuing on 1 devices. [ 428.979635] md: md3: recovery done. [ 428.984824] RAID1 conf printout: [ 428.984836] --- wd:1 rd:2 [ 428.984843] disk 0, wo:0, o:1, dev:sdf1 [ 428.984848] disk 1, wo:1, o:0, dev:sdg1 [ 428.987765] RAID1 conf printout: [ 428.987771] --- wd:1 rd:2 [ 428.987777] disk 0, wo:0, o:1, dev:sdf1 -- With respect, Roman
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