Re: Performance with RAID5 / mirroring ?

From: Mark D Powell <Mark.Powell_at_eds.com>
Date: 29 Jan 2003 06:36:22 -0800
Message-ID: <2687bb95.0301290636.b0a733c@posting.google.com>

LandRoverManREMOVETHIS_at_tiscalimail.nl (Hans van Dam) wrote in message news:<3e37be05.424238406_at_pollux.casema.net>...
> On Wed, 29 Jan 2003 09:43:54 +0100, "RoBog" <robog_at_tin.it> wrote:
>
> >We have Oracle 8.17 (win NT) on 4 hd (data + index + redo + system)
> >
> >If we use RAID5 what's the impact on performance?
> >
> >If we use mirroring (4+4 hd) what's the impact on performance?
>
> RAID 0 = performance (striping)
> RAID 1 = safety (mirrorring)
> RAID 5 = compromise between performance and safety
> RAID 0+1 = performance and safety without compromise
>
> Read all (?) about it at http://www.mylex.com/solutions/aboutrdr.html
>
> Groeten,
>
> Hans van Dam.

Given a choice I would use OS level stripping with mirroring, but it data loss prevention is a very high priority I would not hesitate to mirror RAID-5. We run EMC and their version of RAID-5 is called RAID-S and we perform OS mirroring of the RAID-S disk system to a second RAID-S device. Performance is (amazingly) good.

HTH -- Mark D Powell -- Received on Wed Jan 29 2003 - 08:36:22 CST