Re: RAID on Hitachi 9900 w/Oracle?

In article <Hdu79.26166$EJ4.685834_at_news4.srv.hcvlny.cv.net>, you said (and I quote):
> specifically with storage on a Hitachi 9900 serious storage system? The Hitachi and Sun
> people that I have spoken with so far would have me believe that I can put my entire Oracle
> database on a Hitachi 9900 using all RAID-5 -- because the RAID-5 on this box is so fast and
> has so much cache, etc., etc...
>

Partly true. I don't know about the specific case of the Hitachi, but the EMC is similar and I know about that one. Their cache can really hide many of the disadvantages of RAID5 in a database.

I still would go for RAID1+0 for the redo logs, but that's about it. The rest can happily live in RAID5 in those boxes.

Of course, if you have a very unusual application with tremendous demands off the I/O system, then you may need to refine the concept and use all RAID1+0. But for 90% of the stuff out there, the default will do nice. IOW, it won't be where your performance problem (if any) will live.

-- 
Cheers
Nuno Souto
nsouto_at_optushome.com.au.nospam