Re: testing raid 0

[Jeff Bachtel <jeff@cepheid.org>]

>From personal experience with raidframe on OpenBSD, I'll second
Peter's statement. While it is theoretically possible that a
well-tuned raidframe setup (check the layout section of the raidctl
configuration, as well as the queue) could slightly outperform normal
disk drivers on a scsi chain, its not likely, and is even less likely
on an IDE chain.

On Wed, Aug 01, 2001 at 03:03:27PM +0100, Peter Galbavy wrote:
> Maybe you have misunderstood the benefit of RAID 0/1/5 etc. RAID 0
> givesd you the ability to concatenate disks to get a bigger partition
> than would be possible using a single physical device. It will give you
> no performance benefits. In fact RAID 0 in RAIDframe is probably rather
> inefficient, and you should consider using the simpler ccd(4) drivers.
> 
> RAID1 gives you basic mirroring, but at a performance cost and RAID5
> gives you parity based protection - at an even higher performance cost.
> 
> rgds,
> --
> Peter Galbavy
> Knowtion Ltd.
> ----- Original Message -----
> From: <alx2001@medimex.ro>
> To: <misc@openbsd.org>
> Sent: Wednesday, August 01, 2001 4:42 PM
> Subject: testing raid 0
> 
> 
> > Hi,
> > I've succesfully configured raid 0 using raidctl on tow hdd (non SCSI;
> wd)
> > So I went to the next step of testing but I'm disappointed in the
> > improvement. Actually it's not an improvement is a loss, I think. Take
> a
> > look below: