From: Thomas Bräutigam <thomas.braeutigam@nexustelecom.com>
To: Tino Schwarze <postgresql@tisc.de>
To: pgsql-admin@postgresql.org
To: michael.monnerie@it-management.at
Subject: Re: Recommended RAID for Postgres
Date: Tue, 1 Jul 2008 13:50:10 +0200
Message-ID: <46F5921DF52F6E40860287B30CADADC79464D7@EROS.nexus-ag.com> (raw)
In-Reply-To: <20080630133542.GC24497@easy2.in-chemnitz.de>
References: <46F5921DF52F6E40860287B30CADADC79463A3@EROS.nexus-ag.com>
<20080630125231.GB24497@easy2.in-chemnitz.de>
<46F5921DF52F6E40860287B30CADADC79463C4@EROS.nexus-ag.com>
<20080630133542.GC24497@easy2.in-chemnitz.de>
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 do you 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 disk and 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 run for this size of a Postgres DB? To bring the backup back after a crash again live, I would want a solution which takes me one or two days but not longer. Do you think I can reach the target with a snapshot and also keep in mind the size of 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 every day.
> 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 do you 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 disk and they are difficult to handle already.
Maybe other Postgres admins have more experience with such big DBs.
Tino.
--
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To: pgsql-admin@postgresql.org
Cc: thomas.braeutigam@nexustelecom.com, postgresql@tisc.de, michael.monnerie@it-management.at
Subject: Re: Recommended RAID for Postgres
In-Reply-To: <46F5921DF52F6E40860287B30CADADC79464D7@EROS.nexus-ag.com>
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