| From: | "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com> |
|---|---|
| To: | Johnny Ljunggren <johnny(at)navtek(dot)no> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: 3 x PostgreSQL in cluster/redunant |
| Date: | 2005-11-15 00:09:24 |
| Message-ID: | 20051115000924.GW18570@pervasive.com |
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| Thread: | |
| Lists: | pgsql-general |
On Tue, Nov 15, 2005 at 12:09:40AM +0100, Johnny Ljunggren wrote:
> Jim C. Nasby wrote:
> >On Mon, Nov 14, 2005 at 07:36:44PM +0100, Michelle Konzack wrote:
> >>I have three Sun Server where I have reserved on each Server a Raid-5
>
> >Keep in mind that databases and RAID5 generally don't mix very well.
>
> oh, how come?
> What is the ideal setup of a database server when it comes to storage?
RAID5 has horrible write performance, especialy for random writes (which
is what databases tend to do). If you're running essentially a read-only
database then raid5 is OK. Otherwise you'll be much better off with
RAID10. You also want to put the WAL on a seperate set of drives from
the main database (though again that doesn't buy much if your database
is read-only).
--
Jim C. Nasby, Sr. Engineering Consultant jnasby(at)pervasive(dot)com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
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