Date: Wed, 14 Jan 2004 14:02:01 +0100 From: Raymond Wiker <Raymond.Wiker@fast.no> To: freebsd-stable@freebsd.org Subject: Adaptect raid performance with FreeBSD Message-ID: <16389.15817.322098.577889@raw.grenland.fast.no> In-Reply-To: <200401141453.50150.ari@suutari.iki.fi> References: <200401141453.50150.ari@suutari.iki.fi>
next in thread | previous in thread | raw e-mail | index | archive | help
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.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?16389.15817.322098.577889>