Re: Do you still ned RAID 5 if you follow OFA?

Got to agree with Jan. On reads and for data warehouse applications, raid-5 is the best, economical way to go. However, with several new hardware enabled raid storage array boxes now on the market, raid-5 is becoming a more reasonable choice for transactional processing. I would not use raid-5 for any big, high-permance apps but for general purpose, these new storage arrays are screamers. SUN has come out with one that can out perform software enabled raid-0+1. Research your venders and look for white papers on the web.

dan

Jan Fure wrote:
>
> Hi Satar.
>
> I'm not totaly agree with you on the statement "God knows you don't run
> RAID 5 for speed". This
> is right when insert/update, because of that parity which includes
> within RAID5 ( 2 disk writes for every write trans.). When it comes to
> reading ( datafiles ) RAID5 could be very good for performance, because
> the data is striped ( only datafiles for randomly acsess).
>
> Best regards
>
> satar_at_my-dejanews.com wrote:
> >
> > You have to understand that RAID can serve two purposes...speed and
> > protection from Drive failure. RAID5 is to protect against Drive Failure (God
> > knows you don't run RAID 5 for speed). If you are operating without a RAID
> > solution, and if one of your drives crash, you would need to replace the
> > drive and restore the lost datafile(s) and recover your database. If you have
> > a RAID solution in place, and experience a Disk crash, your database will
> > still be up and you can "simply" replace the damaged disk (Hot-plugable in
> > most cases).
> >
> > I have yet to see a company that doesn't use some sort of RAID solution on
> > thier production machines (Doesn't mean it doesn't exist).
> >
> > Regards,
> > Satar
> >
> > In article <74a0bu$7qg$1_at_nnrp1.dejanews.com>,
> > jmsalvo_at_yahoo.com.au wrote:
> > >
> > >
> > > If you follow OFA, and still implement RAID 5, it would just stripe the
> > > datafiles across all disks, mixing the portions of datafiles of SYSTEM, DATA,
> > > INDEX, ROLLBACK together, wouldn't it?
> > >
> > > Any hard facts or experience using OFA with and without RAID 5?
> > >
> > > Thanks,
> > >
> > > John
> > >
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> >
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Received on Tue Dec 08 1998 - 11:56:42 CST