Hi Tino and Michael,
What storage subsystem do you use? This sounds like you want something like snapshots or similar to do backup. How long
doyou expect a 1-1.5 TB backup to run? I don't know. My biggest DBs are like 110 GB (compressed dump), 300-400 GB on
diskand they are difficult to handle already.
I would like that a backup runs during the system is live, a snapshot would be okay. How long would a 1-1.5 TB backup
runfor this size of a Postgres DB? To bring the backup back after a crash again live, I would want a solution which
takesme one or two days but not longer. Do you think I can reach the target with a snapshot and also keep in mind the
sizeof the DB?
Cheers Thomas
-----Original Message-----
From: pgsql-admin-owner@postgresql.org [mailto:pgsql-admin-owner@postgresql.org] On Behalf Of Tino Schwarze
Sent: Montag, 30. Juni 2008 15:36
To: pgsql-admin@postgresql.org
Subject: Re: [ADMIN] Recommended RAID for Postgres
On Mon, Jun 30, 2008 at 03:15:34PM +0200, Thomas Bräutigam wrote:
> Why avoid RAID5? I though that would be good? Can you explain this?
RAID5 has a lot of disadvantages, especially in terms of performance.
.oO(There was a link posted recently...)
> 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
everyday.
> What do you recommend how often I should backup the complete database?
What storage subsystem do you use? This sounds like you want something like snapshots or similar to do backup. How long
doyou expect a 1-1.5 TB backup to run? I don't know. My biggest DBs are like 110 GB (compressed dump), 300-400 GB on
diskand they are difficult to handle already.
Maybe other Postgres admins have more experience with such big DBs.
Tino.
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