Just to followup to myself here's the tiobench on my 2TB 12x180GB RAID5
array. This is running on two channels of an Adaptec 39160
tiobench.pl --size=4000
Size is MB, BlkSz is Bytes, Read, Write, and Seeks are MB/secd . -T
File Block Num Seq Read Rand Read Seq Write Rand Write
Dir Size Size Thr Rate (CPU%) Rate (CPU%) Rate (CPU%) Rate (CPU%)
------- ------ ------- --- ----------- ----------- ----------- -----------
. 4000 4096 1 113.3 72.5% 1.065 2.11% 55.94 94.0% 2.991 2.68%
. 4000 4096 2 99.09 93.0% 1.375 2.72% 54.84 115.% 3.007 3.46%
. 4000 4096 4 97.11 103.% 1.702 3.37% 50.96 111.% 2.993 3.89%
. 4000 4096 8 95.83 108.% 2.050 3.83% 49.37 107.% 3.032 4.17%
On Sun, 10 Mar 2002, Mike Black wrote:
> I finally got my 2TB array synced. Success was achieved by throttling it to
> 10MB/sec:
>
> echo 10000 >/proc/sys/dev/raid/speed_limit_max
>
> When left at 100MB/sec the raid5d daemon was hitting 100% CPU (hogging one
> CPU on a dual 1Ghz) -- don't know if this may be related or not.
>
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