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Home -> Community -> Mailing Lists -> Oracle-L -> RE: raid 5 disaster
"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:
And statistics after the fact?
Jay
=20
-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] =
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
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-- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------Received on Mon Aug 16 2004 - 06:21:18 CDT
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