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From: Nikolas Everett <nik9000@gmail.com>
To: Gregory Stark <stark@enterprisedb.com>
Cc: Bruce Momjian <bruce@momjian.us>
Cc: pgsql-performance@postgresql.org
Subject: Re: SAN and full_page_writes
Date: Mon, 8 Sep 2008 11:17:41 -0400
Message-ID: <d4e11e980809080817l4f29c647s2e4485451c5e62c1@mail.gmail.com> (raw)
In-Reply-To: <873aka4rbc.fsf@oxford.xeocode.com>
References: <d4e11e980809050724m5f0e8971n3909c26026fda47b@mail.gmail.com>
	<200809061946.m86JkeS01341@momjian.us>
	<d4e11e980809080702i629187bbqab5dd70581ee8057@mail.gmail.com>
	<87myii4t9o.fsf@oxford.xeocode.com>
	<d4e11e980809080748k6f647b6cue9d202f8feb9abca@mail.gmail.com>
	<873aka4rbc.fsf@oxford.xeocode.com>

On Mon, Sep 8, 2008 at 10:59 AM, Gregory Stark <stark@enterprisedb.com>wrote:

>
> That "media recovery" it's referring to sounds like precisely our WAL full
> page writes...
>
>
> --
>   Gregory Stark
>  EnterpriseDB          http://www.enterprisedb.com
>   Ask me about EnterpriseDB's PostGIS support!
>

That sounds right.

So the take home from this is that NetApp does its best to protect you from
partial page writes but comes up short on untweaked NFS (see doc to tweak.)
Otherwise you are protected so long as your OS and file system implement
fsync properly.

--Nik

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