"AF" <af_at_nospaming.com> wrote in message news:<aer4vi$i9a$1_at_pith.uoregon.edu>...
> I have read conflicting recommendations about HD Config:
> I have heard that RAID5 is best for Warehouse Apps.
> I have also read that OFA is the best way to reduce drive contention.
> Which is better for my system
>
> I have 4-73GB hard drives and a Single Channel SCSI RAID controller. I
> have a data warehouse type application. The only DML is INSERT and this is
> done quarterly. There are only a few partitioned tables and they are about
> 6GB. The Queries are usually complex joins and large aggregate sets.
> Sometimes these queries require temporary tables that may have Insert and
> update DML.
With only four disc and one controller you're limited to use RAID5,
because you don't have enough drives to use different placement
schema. However, even for RAID5 are four drives not very good, because
you'll lost one quarter of overall capacity and also perfomance gains
can be bigger with more disc.
This is a very common problem with nowadays big disc drives. 16x
18gigs has the same capacity, but much better flexibility in placement
(of course only if you have enough disc slots and controllers).
--
_________________________________________
Dusan Bolek, Ing.
Oracle team leader
Note: pagesflames_at_usa.net has been cancelled due to changes (maybe we
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email.
Received on Thu Jun 20 2002 - 01:17:01 CDT
