Adaptect raid performance with FreeBSD
Raymond.Wiker at fast.no
Wed Jan 14 05:02:06 PST 2004
Ari Suutari writes:
> dd if=/dev/rda1s1a of=/dev/null bs=1m count=100
> 100+0 records in
> 100+0 records out
> 104857600 bytes transferred in 4.193832 secs (25002814 bytes/sec)
> So, I get only about 25MB/s. Shouldn't I be getting something
> like 70 MB/s, or even more since there are two disks that
> can server read requests ?
Have you tried other block sizes? I think you may be able to
get better results by going to a lower block size (e.g, 64k instead of
1m). Some experimentation will show which block size(s) work best.
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