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

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 - 08:22:54 CST