Re: Oracle and RAID

Dean Cunningham <deanc_at_wairc.govt.nz> wrote in article <31E23307.6BFE_at_wairc.govt.nz>...
> kavis_at_usa.pipeline.com wrote:
> [snip]
> >
> > 3 and 5 negative on update/write operation, reliability is gained at
 the
> > expense of performance or need large cache,
> >
> > 0+1 best performance of all the RAID options, but doubles the # of
> > disks...so more $
>
> Fully agree. FYI Compaq were "quoting" a 15% drop in performance on
> their Array controllers with RAID 5 vs Raid 0/1.
> With their new controller they are "quoting" 5% drop.
>
> So perhaps the type of RAID controller can affect performance as
> well.....
>

Caching can make a big difference - almost enough to remove most of the write penalty. My guess is that Compaq has either just added a much larger cache to the controller or that and some other changes.

Glenn Stauffer
DBA
Swarthmore College   Received on Thu Jul 18 1996 - 00:00:00 CEST