Re: Recommended RAID for Postgres

Hi Tino,

Why avoid RAID5? I though that would be good? Can you explain this?

Writing in the DB, I add about 5-10 GB of data a day. There is a lot of writing activity going on in the database every day.
What do you recommend how often I should backup the complete database?

Cheers Thomas

-----Original Message-----
From: pgsql-admin-owner(at)postgresql(dot)org [mailto:pgsql-admin-owner(at)postgresql(dot)org] On Behalf Of Tino Schwarze
Sent: Montag, 30. Juni 2008 14:53
To: pgsql-admin(at)postgresql(dot)org
Subject: Re: [ADMIN] Recommended RAID for Postgres

On Mon, Jun 30, 2008 at 02:30:23PM +0200, Thomas Bräutigam wrote:

> I have a pretty huge Postgres DB, about 1,3 to 1,5 Terra.

Thats plenty of data.

> What do you guys recommend on RAID Levels for this Database. Which
> does Postgres recommend, and with which do Postgres run very good or
> in the best way?

Avoid RAID5. Go for RAID10.

BTW: I wonder how much the used filesystem affects Postgres' performance...

> What Backup Strategy do you think would be the best. Dump the DB once
> a week or work with the WAL`s? For your info, the data which is feeded
> to the database is available and could be feeded again but it would
> maybe take a couple of days. So what would be a solution to bring up
> the huge DB in about one day after a crash. This would be the target.

How much writing activity is on the DB? WALs are probably the way to go.
How often you backup the whole DB space (as a starting point for replaying WALs) depends on how much changes the DB gets. And how long it will take to restore the DB space and the WALs afterwards.

HTH,

Tino.

--
"What we nourish flourishes." - "Was wir nähren erblüht."

www.craniosacralzentrum.de
www.forteego.de

--
Sent via pgsql-admin mailing list (pgsql-admin(at)postgresql(dot)org) To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-admin