Re: [ADMIN] H/W RAID 5 on slower disks versus no raid on
Björn Metzdorf <bm@turtle-entertainment.de>
From: "Bjoern Metzdorf" <bm@turtle-entertainment.de>
To: "scott.marlowe" <scott.marlowe@ihs.com>
Cc: <pgsql-performance@postgresql.org>
Date: 2002-11-21T21:57:59Z
Lists: pgsql-performance
> Generally RAID 5. RAID 1 is only faster if you are doing a lot of > parellel reads. I.e. you have something like 10 agents reading at the > same time. RAID 5 also works better under parallel load than a single > drive. yep, but write performance sucks. > The fastest of course, is multidrive RAID0. But there's no redundancy. With 4 drives I'd always go for raid 10, fast and secure > Oddly, my testing doesn't show any appreciable performance increase in > linux by layering RAID5 or 1 over RAID0 or vice versa, something that > is usually faster under most setups. Is this with linux software raid? raid10 is not significantly faster? cant believe that... Regards, Bjoern