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Re: I/O increase after upgrading to 8.3.5

From: Craig Ringer <craig(at)postnewspapers(dot)com(dot)au>
To: Alexander Staubo <alex(at)bengler(dot)no>
Cc: pgsql-performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: I/O increase after upgrading to 8.3.5
Date: 2009-02-14 08:49:05
Message-ID: 49968581.7070205@postnewspapers.com.au (view raw or flat)
Thread:
Lists: pgsql-performance
Alexander Staubo wrote:
> On Fri, Feb 13, 2009 at 12:53 PM, Alexander Staubo <alex(at)bengler(dot)no> wrote:
>> The upgrade was done with dump/restore using "pg_dump -Fc". The old
>> database lived on a SAN volume, whereas the new database lives on a
>> local disk volume.
> 
> I need to correct myself: The Munin graphs were never set to track the
> SAN volume where the old database lived. So when the graph goes from
> "near-zero" to "lots", it's actually correct.
> 
> When I compare the correct graph, however, it's apparently that I/O
> writes have, on average, doubled.

Is there any chance you had pg_xlog stored separately on your old 
database, and I/O for it wasn't being recorded?

--
Craig Ringer

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