Re: [PERFORM] Postgres on Netapp

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: "D'Arcy J(dot)M(dot) Cain" <darcy(at)druid(dot)net>
Cc: Larry Rosenman <ler(at)lerctr(dot)org>, Shankar K <shan0075(at)yahoo(dot)com>, pgsql-performance(at)postgresql(dot)org, pgsql-admin(at)postgresql(dot)org
Subject: Re: [PERFORM] Postgres on Netapp
Date: 2004-01-23 15:01:09
Message-ID: 200401231501.i0NF19B08501@candle.pha.pa.us
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D'Arcy J.M. Cain wrote:
> With the price of GigE adapters I wouldn't consider anything else.
>
> I have a huge database that takes about an hour to copy. The netApp snapshot
> feature is very nice because I can get a "moment in time" image of the
> database. Even though I can't run from the snapshot because it is read only
> (*) and PG needs to write to files just to open the database, I can copy it
> and get a runnable version of the DB. If I copy directly from the original I
> can get many changes while copying and wind up with a copy that will not run.
>
> (*): It would be nice if PG had a flag that allowed a database to be opened in
> read only mode without touching anything in the directory.

PostgreSQL has to read the WAL to adjust the contents of the flat file
on startup in such a setup, so I don't see how we could do it read-only.

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pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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