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IDS Forum

RE: using raid 5 with a san

Posted By: ERIEZNIKR@REPSOLYPF.COM
Date: Thursday, 17 February 2005, at 11:01 a.m.

In Response To: using raid 5 with a san (Floyd Wellershaus )

It depends on the underlying technologies... eg. HP EVA, EMC's
Symettrix, older and newer models, all of them behave completely
different.
Some perform really good on RAID5

Is your DB write intensive or mostly read-intensive? Consider stripping
with RAID1

-----Mensaje original-----
De: forum.subscriber@iiug.org [mailto:forum.subscriber@iiug.org] En
nombre de Floyd Welle....
Enviado el: Jueves, 17 de Febrero de 2005 10:12 a.m.
Para: ids@iiug.org
Asunto: using raid 5 with a san [4283]

Hello,
Here's one for you Art, ( just kidding ) anybody please.

I know that raid 5 is a performance no no with Informix. However, we are
getting a San. The way I understand it, this high performance San can
raid and strip across disks anyway it likes, and that is totally
transparent to the OS and to informix.
The san with all it's dual channels, high speed fiber, super fast
processors etc.. should mitigate the performance hits of raid 5.

Am I correct in this assumption, or is there a reason to not use raid 5
even with a high performance San. And if so, what is the recommendation,
Raid 1 ?

Thanks,
Floyd


========================
-<<Floyd Wellershaus>>-
Database Administrator
Unix Administrator

email: fwellers@yahoo.com
Work: 703-733-4126
Pager: 703-705-9241
Email Pager: 7037059241@my2way.com
Home: 703-430-0805
Cell: 703-477-6045
========================





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