>Hello,
>
>I am new to raid and running disk benchmarks. I am not getting the
>performance from my raid I was expecting. This machine is going to be
>running apache/php/mysql in a very high load environment and I want to
>make sure things are running well before I put it into production.
>
>Any input would be greatly appreciated!!!
>
>Thanks!
>
>Jacob Martinson
[snip]
>Here's my /proc/mdstat:
>Personalities : [linear] [raid0] [raid1] [raid5] [translucent]
>read_ahead 1024 sectors
>md0 : active raid5 sdg1[3] sdf1[2] sde1[1] sdd1[0] 17863936 blocks
>level 5, 128k chunk, algorithm 2 [3/3] [UUU] resync=31% finish=87.5min
>unused devices: <none>
>
You see the resync= and finish= part? Your raid is busy doing stuff.
Try your benchmarks again when it's completed it's setup and see what
it says. The resync was most likely sucking cpu, memory, and disk
i/o from your tests that wouldnt happen during normal operation...
-j
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Copyright 2000 Jeffrey Paul.
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