RE: DISK configuration - help please.

RAID 5 performs fine on read but it's bad when you have a lots small random writes. So in general, it's bad for OLTP.

-----Original Message-----
From: root_at_fatcity.com [mailto:root_at_fatcity.com]On Behalf Of Steve McClure
Sent: Thursday, August 17, 2000 3:18 PM
To: Multiple recipients of list ORACLE-L Subject: Re: DISK configuration - help please.

I am not going to be much help in regards to your initial question, but I am wondering what is wrong with RAID 5? I have had alot of success with that configuration in the past. What am I missing?

Steve McClure
----- Original Message -----
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Sent: Thursday, August 17, 2000 11:14 AM

> Get rid of RAID 5.
>
> Lyall
>
> At 06:46 AM 8/17/00 -0800, you wrote:
>
> >I am in the process of building two DB servers - one live and the other
> >standby. We are not overly concerned with disk capacity - but rather
with
> >speed of access.
> >
> >Our current configuration is
> >
> >primary has 10 disks in RAID 0+1
> >standby has 6 disks in RAID 5
> >
> >This is to give us 5 physical devices for production - I think a holdover
of
> >OFA guidelines.
> >
> >What I am looking for is a bit of advice on the best optin for current
> >configurations. I can add disks to this later. I am also using Veritas
VM
> >and FS and so can relayout my RAID 5 to RAID 0+1 pretty easily as well.
> >Adding disks to the system is also a breaze.
> >
> >All of these disks are in one FS mounted to /u01 .. .for easy management
on
> >our site we elected one mount point and one very expandable FS.
> >
> >I am considering breaking my configuration and going with 8 disks in 0+1
for
> >both systems - or going with 10 and 6 but both in 0+1 - I don't think
that
> >RAID 5 is a good idea ever - even for a standby system, but there is some
> >pressure to have 5 physical devices and RAID 5 with 6 gives us that
too...
> >
> >
> >Anybody out there willing to throw two cents my way?
> >
> >
> >thanks!
> >
> >adam
> >--
> >Author: Adam Turner
> > INET: ATurner_at_concretemedia.com
> >
> >Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
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> --
> Author: Lyall Barbour
> INET: lbarbour_at_stanford.edu
>
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--
Author: Steve McClure
  INET: steve_at_pactr.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
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