RE: Raid 50

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


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