From: Wesley Joyce (Wesley.Joyce@UVI.EDU)
Date: Wed Nov 27 2002 - 09:46:57 EST
Okay. I would like to elaborate on the setup.
It will be two 650s each with 7133s w/ 6 18GB SSA. HACMP will be setup. I
have a concern that if I mirror to much within on node/drawer that I will
drastically reduce my file storage and PVs that can be added to VGs. Can
the mirroring be done across the HACMP nodes and their respective
drawers/disks so in essence I have 108GB of RAID 1 within the cluster?
At 10:34 AM 11/27/2002, you wrote:
>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
>(340) 693-1469 (voice) / (340) 693-1465 (fax)
>http://www.uvi.edu
>
>"If you can't explain it simply, than you don't know it well enough. -
>Unknown."
>
>
>
>
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