Re: I/O increase after upgrading to 8.3.5

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