From: Alvaro Herrera <alvherre@commandprompt.com>
To: Jignesh Shah <J.K.Shah@Sun.COM>
Cc: 李彦 Ian Li <liyan82@gmail.com>
Cc: PostgreSQL Performance <pgsql-performance@postgresql.org>
Subject: Re: ZFS and Postgresql - WASRe: Best OS for Postgres 8.2
Date: Wed, 9 May 2007 13:01:45 -0400
Message-ID: <20070509170145.GS4504@alvh.no-ip.org> (raw)
In-Reply-To: <4641F672.6090508@sun.com>
References: <1178574927.533849.90730@e51g2000hsg.googlegroups.com>
<B699315F-9D8D-40E7-9C42-DD0C9E7DEA4F@blighty.com>
<463FFF76.5070108@gmail.com>
<4641F672.6090508@sun.com>
Jignesh Shah escribió:
> Now comes the thing that I am still exploring
> * Do we do checksum in WAL ? I guess we do .. Which means that we are
> now doing double checksumming on the data. One in ZFS and one in
> postgresql. ZFS does allow checksumming to be turned off (but on new
> blocks allocated). But of course the philosophy is where should it be
> done (ZFS or PostgreSQL).
Checksums on WAL are not optional in Postgres, because AFAIR they are
used to determine when it should stop recovering.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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To: pgsql-performance@postgresql.org
Cc: alvherre@commandprompt.com, J.K.Shah@Sun.COM, liyan82@gmail.com
Subject: Re: ZFS and Postgresql - WASRe: Best OS for Postgres 8.2
In-Reply-To: <20070509170145.GS4504@alvh.no-ip.org>
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