Neil Brown wrote:
Hmm.... nothing obvious.
Have you tried increasing
/proc/sys/dev/raid/speed_limit_min:1000
just in case that makes a difference (it shouldn't but you seem to be
down close to that speed).
No difference..
What speed in the raid6 algorithm used - as reported at boot time?
Again, I doubt that is the problem - if should be about 1000 times
speed you are seeing.
raid6: int32x1 739 MB/s
raid6: int32x2 991 MB/s
raid6: int32x4 636 MB/s
raid6: int32x8 587 MB/s
raid6: mmxx1 1556 MB/s
raid6: mmxx2 2701 MB/s
raid6: sse1x1 1432 MB/s
raid6: sse1x2 2398 MB/s
raid6: using algorithm sse1x2 (2398 MB/s)
md: raid6 personality registered for level 6
raid5: automatically using best checksumming function: pIII_sse
pIII_sse : 2345.000 MB/sec
raid5: using function: pIII_sse (2345.000 MB/sec)
md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: bitmap version 4.39
What if you try increasing /sys/block/md0/md/stripe_cache_size ?
I already have this at 8192 (which appears to be HUGE for 15 drives, but I've got 1.5GB of ram and
nothing else using it)
That's all I can think of for now.
Oh well, no stress.. Just thought I'd ask anyway :)
Brad
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