| From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
|---|---|
| To: | Jordan Tomkinson <jordan(at)moodle(dot)com> |
| Cc: | Aidan Van Dyk <aidan(at)highrise(dot)ca>, Greg Smith <gsmith(at)gregsmith(dot)com>, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: High cpu usage after many inserts |
| Date: | 2009-02-25 00:59:40 |
| Message-ID: | 1235523580.9565.112.camel@jd-laptop.pragmaticzealot.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
On Wed, 2009-02-25 at 09:44 +0900, Jordan Tomkinson wrote:
>
>
> On Wed, Feb 25, 2009 at 9:23 AM, Joshua D. Drake
> <jd(at)commandprompt(dot)com> wrote:
>
>
> RAID5 outside of RAID 0 is the worst possible RAID level to
> run with a
> database. (of the commonly used raid level's that is).
>
> It is very, very slow on random writes which is what databases
> do.
> Switch to RAID 10.
>
> surely being (real) hardware raid with 15k rpm disks this wouldn't be
> a huge issue unless a large amount of data was being written ?
Tests done by Mark Wong on a 3 disk 15k scsi versus 4 disk raid 10 scsi
show that RAID 10 is on average 30% faster.
Sincerely,
Joshua D. Drake
>
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