ADSM-L

Re: RAID 1 vs RAID 5 for db

1998-09-04 14:55:53
Subject: Re: RAID 1 vs RAID 5 for db
From: Paul Hilchey <hilchey AT UCS.UBC DOT CA>
Date: Fri, 4 Sep 1998 11:55:53 -0700
On Sep 3, 10:40am, Cunningham, Jennifer wrote:
> Hello all,
> Just need some advice and scenarios, etc......
> We currently have RAID 1 (mirroring) for our ADSM db and recovery log
> like good little girls and boys.  However, our dbs are filling up very
> quickly!  I would like to increase the capacity, and would like to go
> RAID 5 with only 3 drives,  for more security and capacity.  I am quite
> aware that RAID 5 does slow down performance.
>
> So my question to y'all is:  Have any of you put your databases on RAID
> 5, and if so, have you seen any performance degradation?
>
> I figure I can always try it and revert back to RAID 1 anyway, but I
> just would like some feedback.
>
> Thanks so much,
> Jenn

My opinion: Don't waste your time with RAID 5.  Disks are cheap enough
that it is rarely economical.  RAID 5 was designed to provide data
protection at less cost than mirroring, but all too often I see people
buying expensive raid controllers to offset the performance penalty.
They spend more on their "cheap" RAID 5 systems than they would have
by just mirroring and striping.

--
Paul Hilchey
Paul Hilchey
University Computing Services
The University of British Columbia
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