Re: RAID Level 5 and RedoLog-Files

Nuno Souto wrote:
>
> Helmut Hahn wrote:
> >
> > We plan to set up an Database for a universal research center on NT4.0 with
> > RAID 5.
> >
> > The question is how such a RAID should be configuered. Must RedoLogFiles be
> > holded twice or more, or is it sure enough to reley on the RAID system and
> > setting up only one.
> >
> > Or should the RAID be configuered to act like two seperate devices and set
> > up two LogFiles and having the chance to divide up the Tablespaces on these
> > devices for performance issues?
> >
> > Any suggestions would be nice
> >
> > HH
>
> Try using RAID5 for your data files and normal disk devices and
> controllers for the redo logs (using the ORACLE grouping to achieve
> mirroring of the redo logs). Then you'll get top performance...

The latest Oracle magazine has a listing of each RAID level along with the estimated
overhead involved. RAID 5 was listed as adding 20% overhead.

I agree with the previous two posters that the redo logs should be kept off of RAID5 if
possible.

Tim. Received on Fri Jan 24 1997 - 00:00:00 CST