ciss(4): speed degradation for Compaq Smart Array [edited]

[Doug White]

On Wed, 30 Mar 2005, Andrey Koklin wrote:

> Firstly, I'm thankful to people who had found time to answer my previous
> messed post privately. Indeed, I hadn't put there key information about
> my system configuration, as well as the tests themselves say little or
> nothing on real disk system performance (they used 1K blocks and didn't
> take into consideration disks geometry).

You've still omitted the array setup, including RAID type and stripe size.

I'd also suggest using a tool like iozone to run your tests instead of dd.
Unless your workload consists of entirely sequential writes this perf test
is worthless.

-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite at gumbysoft.com          |  www.FreeBSD.org