DJK(John) Robinson
djkr at msn.com
Mon Jan 28 10:15:12 CST 2008
I'm running only RAID 1 pairs, through two different hardware cards, and got similar results from both as from the new disc (not yet RAIDed). So at least for me, my new partitioning rule stands: "active first, dormant last". John -----Original Message----- From: dba-tech-bounces at databaseadvisors.com [mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of jwcolby Sent: 28 January 2008 15:15 To: 'Discussion of Hardware and Software issues' Subject: Re: [dba-Tech] Performance in disc partitions Since you mentioned the RAID thing I might as well add that as soon as you put stuff on RAID that advantage may go away. Raid takes over and puts stuff where it will on the disks under its care. It might very well create the first volume on the edge, who knows. OTOH it might not. John W. Colby Colby Consulting www.ColbyConsulting.com -----Original Message----- From: dba-tech-bounces at databaseadvisors.com [mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of DJK(John) Robinson Sent: Monday, January 28, 2008 9:24 AM To: 'Discussion of Hardware and Software issues' Subject: Re: [dba-Tech] Performance in disc partitions Well, I've trawled the web, and come up with the usual bunch of conflicting, unsubstantiated tosh. My favorite was along the lines of "running RAID 1 completely eliminates the need for backup". Yeah, right. Step away from my system, sir. The consensus, though, is that the first partition goes next to the edge, with the last one by the spindle. People differ in saying what difference this makes - a lot or hardly any: http://partition.radified.com/partitioning_2.htm http://www.xsibase.com/forum/index.php?board=15;action=display;threadid=3452 8 I found PassMark Performance Test (30-day free trial) at http://www.passmark.com/products/pt.htm; I've no idea how good it is generally I tried this on first and last partitions on a 500GB disc and got results suggesting 25%-45% better performance on the *first* partition, which supports the 'edge is first is better' theory. I'm not publishing the results, because they weren't on a scientific basis, but I *am* going to put my active stuff first, near the edge, and my dormant stuff last! John _______________________________________________ dba-Tech mailing list dba-Tech at databaseadvisors.com http://databaseadvisors.com/mailman/listinfo/dba-tech Website: http://www.databaseadvisors.com