All,
I'm looking for a bit of guidance here. I have a RAID 6 set up on my
system and am seeing some errors in my logs as follows:
# cat messages | grep "read erro"
Dec 15 15:40:34 nuova kernel: md/raid:md4: read error corrected (8
sectors at 974262528 on sda4)
Dec 15 15:40:34 nuova kernel: md/raid:md4: read error corrected (8
sectors at 974262536 on sda4)
Dec 15 15:40:34 nuova kernel: md/raid:md4: read error corrected (8
sectors at 974262544 on sda4)
Dec 15 15:40:34 nuova kernel: md/raid:md4: read error corrected (8
sectors at 974262552 on sda4)
Dec 15 15:40:34 nuova kernel: md/raid:md4: read error corrected (8
sectors at 974262560 on sda4)
Dec 15 15:40:34 nuova kernel: md/raid:md4: read error corrected (8
sectors at 974262568 on sda4)
Dec 15 15:40:34 nuova kernel: md/raid:md4: read error corrected (8
sectors at 974262576 on sda4)
Dec 15 15:40:34 nuova kernel: md/raid:md4: read error corrected (8
sectors at 974262584 on sda4)
Dec 15 15:40:34 nuova kernel: md/raid:md4: read error corrected (8
sectors at 974262592 on sda4)
Dec 29 01:58:23 nuova kernel: md/raid:md4: read error corrected (8
sectors at 600923648 on sdb4)
Dec 29 01:58:23 nuova kernel: md/raid:md4: read error corrected (8
sectors at 600923656 on sdb4)
Dec 29 01:58:23 nuova kernel: md/raid:md4: read error corrected (8
sectors at 600923664 on sdb4)
Dec 29 01:58:23 nuova kernel: md/raid:md4: read error corrected (8
sectors at 600923672 on sdb4)
Dec 29 01:58:23 nuova kernel: md/raid:md4: read error corrected (8
sectors at 600923680 on sdb4)
Dec 29 01:58:23 nuova kernel: md/raid:md4: read error corrected (8
sectors at 600923688 on sdb4)
Dec 29 01:58:23 nuova kernel: md/raid:md4: read error corrected (8
sectors at 600923696 on sdb4)
Dec 29 01:58:23 nuova kernel: md/raid:md4: read error corrected (8
sectors at 600923520 on sdc4)
Dec 29 01:58:23 nuova kernel: md/raid:md4: read error corrected (8
sectors at 600923528 on sdc4)
Dec 29 01:58:23 nuova kernel: md/raid:md4: read error corrected (8
sectors at 600923536 on sdc4)
Dec 29 03:04:01 nuova kernel: md/raid:md4: read error corrected (8
sectors at 422940552 on sdd4)
Dec 29 03:04:01 nuova kernel: md/raid:md4: read error corrected (8
sectors at 422940672 on sdb4)
Dec 29 03:04:01 nuova kernel: md/raid:md4: read error corrected (8
sectors at 422940680 on sdb4)
Dec 29 03:04:01 nuova kernel: md/raid:md4: read error corrected (8
sectors at 422940688 on sdb4)
Dec 29 03:04:01 nuova kernel: md/raid:md4: read error corrected (8
sectors at 422940696 on sdb4)
I've Google'd the heck out of this error message but am not seeing a
clear and concise message: is this benign? What would cause these
errors? Should I be concerned?
There is an error message (read error corrected) on each of the drives
in the array. They all seem to be functioning properly. The I/O on the
drives is pretty heavy for some parts of the day.
# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5]
[raid4] [multipath]
md1 : active raid6 sdb1[1] sda1[0] sdd1[3] sdc1[2]
497792 blocks level 6, 64k chunk, algorithm 2 [4/4] [UUUU]
md2 : active raid6 sdb2[1] sda2[0] sdd2[3] sdc2[2]
4000000 blocks level 6, 64k chunk, algorithm 2 [4/4] [UUUU]
md3 : active raid6 sdb3[1] sda3[0] sdd3[3] sdc3[2]
25992960 blocks level 6, 64k chunk, algorithm 2 [4/4] [UUUU]
md4 : active raid6 sdb4[1] sda4[0] sdd4[3] sdc4[2]
2899780480 blocks level 6, 64k chunk, algorithm 2 [4/4] [UUUU]
unused devices: <none>
I have a really hard time believing there's something wrong with all
of the drives in the array, although admittedly they're the same model
from the same manufacturer.
Can someone point me in the right direction?
(a) what causes these errors precisely?
(b) is the error benign? How can I determine if it is *likely* a
hardware problem? (I imagine it's probably impossible to tell if it's
HW until it's too late)
(c) are these errors expected in a RAID array that is heavily used?
(d) what kind of errors should I see regarding "read errors" that
*would* indicate an imminent hardware failure?
Thoughts and ideas would be welcomed. I'm sure a thread where some
hefty discussion is thrown at this topic will help future Googlers
like me. :)
-james
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