From: Gene Sais (Gsais@CO.PALM-BEACH.FL.US)
Date: Wed Nov 27 2002 - 11:30:07 EST
Actually, a myth Raid-5 is suitable for intensive I/O. Nothing beats Raid-1. If nothing else, put your redo logs on Raid-1. Check out this link, membership is free and loads of good documentation from some of the best in the field.
http://www.hotsos.com/dnloads/1.Millsap2000.01.03-RAID5.pdf
hth,
Gene
>>> James.Jackson@MAIL.STATE.AR.US 11/27/02 09:34AM >>>
These days, with fast disk drives, big disk capacities and write-caching
controllers, RAID level is less of a factor than it used to be. As I
understand it, a more critical aspect to DB performance is separation of
workload; i.e., isolating disk I/O for data files vs indexes vs redo
logs. You also have to weigh cost, as well, and you need to consider
how much SSA bandwidth you have and gauge your opportunities for future
growth. If you choose RAID-5, you'd be best served to have fast-write
cache on your SSA card.
Regards,
James Jackson
-----Original Message-----
From: Wesley Joyce [mailto:Wesley.Joyce@UVI.EDU]
Sent: Wednesday, November 27, 2002 8:01 AM
To: aix-l@Princeton.EDU
Subject: Re: How many SSA disks to configure in a RAID array ?
I would like to add a related question. I am obtaining a 7133 with 6
18GB
drives. I remember when it was best to setup a different RAID level
based
on the type of files that would be stored. Is this still recommend or
can
I go with a RAID 5? Data that will be stored will be Oracle data,
Content
Manager and user home directories.
At 04:09 AM 11/27/2002, you wrote:
>Hi sachin
>
>In case you have a single SSA controller , I suppose you would be
better off
>putting all your disk in one raid , so you can stripe across five disks
>instead of 3 or 2 as the case maybe.
>
>Regards
>Shirish joshi
>
>
> -----Original Message-----
>From: Ganu Sachin, IBM [mailto:Sachin.Ganu@KWA2.SIEMENS.CO.IN]
>Sent: 27 November 2002 10:41
>To: aix-l@Princeton.EDU
>Subject: How many SSA disks to configure in a RAID array ?
>
>Hi
>
>I am going to install 5 x 72 GB SSA disks (10K RPM) in RAID 0
configuration
>in a 7133 box. I have a SSA controller with onboard 128 MB SDRAM & 32
MB
>FastWrite cache. Do I configure 1st RAID 0 set with 3 disks in loop A
and
>2nd RAID 0 set with 2 disks in loop B or do I configure these 5 SSA
disks in
>single RAID 0 array on loop A ? I am not bothered redundancy / fault
>tolerance.
>
>Your expert comments please ....
>
>Thanks & regards
>
>Sachin Ganu
>IBM Global Services
>
>
>
>
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Wesley Joyce, Systems Administrator
Center for Administrative Computing (CAC), IT
University of the Virgin Islands
#2 John Brewers Bay, St. Thomas, USVI 00802-9990
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"If you can't explain it simply, than you don't know it well enough. -
Unknown."
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