RE: raid 5 disaster
- From: "Hostetter, Jay M" <JHostetter@xxxxxxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 16 Aug 2004 07:25:24 -0400
"But is has a huge cache. You'll never flood it..."
We're setting up a Shark now, and this is the argument we heard. How do I =
counter that argument, other then providing this link:
http://www.baarf.com/
And statistics after the fact?
Jay
=20
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] =
On Behalf Of Jared Still
Sent: Saturday, August 14, 2004 11:28 AM
To: Oracle-L Freelists
Subject: Re: raid 5 disaster
On Sat, 2004-08-14 at 07:05, Mogens N=F8rgaard wrote:
> Since this was the old Shark, we knew it was using cheap, slow, old=20
> disks (7500 RPM). And 8-pack contains 6 data disks, one dedicated=20
> parity disk (RAID-4) and one hot spare. So a total of 300 IO's per=20
> second per 8-pack was to be expected.
>=20
We purchased this same system several year ago at a previous employer.
When I sat down with the IBM technical consultant, I was somewhat aghast to=
learn of this configuration. But, it was actually worse than you have por=
trayed it.
There were 4x8 packs in this system, and they could not all be configured t=
he same way. Two of them were allowed to have one less disk dedicated to o=
verhead, which created some very odd stripe sizes.
It wasn't bad enough that the only configuration available was RAID-4/5.
I wasn't impressed. The Sharks didn't go into production until after I lef=
t the company, but I was told by a project mgr on the DW project the perfor=
mance was indeed less than stellar.
BAARF!
Wish I had had my 'No RAID5' hat then.
Jared
**DISCLAIMER
This e-mail message and any files transmitted with it are intended for the =
use of the individual or entity to which they are addressed and may contain=
information that is privileged, proprietary and confidential. If you are n=
ot the intended recipient, you may not use, copy or disclose to anyone the =
message or any information contained in the message. If you have received t=
his communication in error, please notify the sender and delete this e-mail=
message. The contents do not represent the opinion of D&E except to the ex=
tent that it relates to their official business.
----------------------------------------------------------------
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
-----------------------------------------------------------------
Other related posts:
