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Re: DBA Experiences with Oracle and RAID 0+1

From: Jared Still <jkstill_at_cybcon.com>
Date: Tue, 15 Jan 2002 19:03:05 -0800
Message-ID: <F001.003F0E6F.20020115185019@fatcity.com>

Mogens,

Attachments don't make it to the list. so you may just need to send it to Jon directly, or put it somewhere publicly accessible.

Jared

On Tuesday 15 January 2002 17:25, Mogens Nørgaard wrote:
> Jon,
>
> It's one of those "how many bags will I need in the supermarket?"
> questions - it depends.
>
> Consider:
>
> - RAID 1+0 is much better than 0+1.
> - Three disks is not much w.r.t. IO capability. If you have three
> concurrent users you'll be OK :)
> - Size doesn't matter (who cares if it's 10, 36 or 73 Gig disks? It's
> the IO capabilitity that counts)
> - I'm new to this list, so I don't know if this will work, but I've
> attached a brilliant presentation by our old friend James Morle (check
> out www.ScaleAbilities.com) regarding SAN, NAS and RAS (Random Acronym
> Seminar).
> - If you're only striping across three disks (is that really a SAN?)
> just SAME (Stripe And Mirror Everything). It might not be good, but it's
> simple.
>
> Jon Behnke wrote:
> >We are in the process of setting up a SAN using RAID 0+1 for our database.
> >In our current environment, we are able to separate our tables, indexes,
> >rollback segments, and archive logs on different disks. On the SAN we
> > would have six 73 gig disks on RAID 0+1 for a total of about 210 Gig of
> > usable space (3 disks worth of space).
> >
> >Some white papers that I have read suggest attempting to separate the
> > data, indexes, and rollback segments on separate RAID volumes, and others
> > simply suggest that the performance boost of striping will supercede the
> > separation of these items.
> >
> >Can anyone offer any comments or suggestions?
> >
> >Jon Behnke
> >Applications Development Manager
> >Industrial Electric Wire & Cable
> >Phone (262) 957-1147 Fax (262) 957-1647
> >jonb_at_iewc.com


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Author: Jared Still
  INET: jkstill_at_cybcon.com

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Received on Tue Jan 15 2002 - 21:03:05 CST

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