While, I have enjoyed the frivolity, there is something to cosider, If = Oracle cannot perform well enough on Raid5 systems, then it may be = unsuitable for very large databases. When one has to store petabytes = worth of data in both online and near-line storage, with hundreds of = terabytes online, power consumption is a significant cost. Systems = with the need to store exabytes worth of data are not far off. This is not to say there are no performance penalties associated with = using Raid 5 and Oracle. If CERN's Large Hadron Collider projects = picks Oracle to store its event data, I'll bet they use Raid 5.=20 Ian MacGregor Stanford Linear Accelerator Center ian@xxxxxxxxxxxxxxxxx =20 -----Original Message----- From: Mogens N=F8rgaard [mailto:mln@xxxxxxxxxxxx]=20 Sent: Tuesday, July 13, 2004 11:44 PM To: oracle-l@xxxxxxxxxxxxx Subject: Re: Raid 50 Why indeed stop with RAID-5 when you can do RAID-6 (aptly named for the = factor six it incurs on small writes)? Then, finally, we could have the RAID-666. As Cary pointed out to be, the Law Of Bigger Numbers (LOBN) applies = here - both with respect to number of IO's and number of dollars spent. James Morle had his birthday party this previous weekend, and while = having one beer we decided to announce (jointly with the help of the = BAARF Party members, perhaps?) the RAID-42 system soon, complete with = an official-looking press release and all. It would probably automatically produce competitive marketing papers = from the big vendors, explaining that the simplicity of RAID-510 is to = be preferred to this new, un-tested RAID-42 technology by a startup = company called BAARF Unlimited. We all know RAID-4 (some of you might be using it without knowing it, = even!), but RAID-2 is less known - it's the first RAID-level that = introduces parity disks. And I MEAN, literally, parity DISKS. It's = beautiful. It must be a historic oversight that it's never really been = used. Mogens Thomas Day wrote: > <sarcasm> > My mind immediately leapt to the RAID-555 technology; but why stop=20 > ther=3D e? > The more you RAID-5 it the better the performance, right? > </sarcasm> >=20 ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put = 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------