David Barton <dave(at)oneit(dot)com(dot)au> writes:
> I am running postgres 9.1.4 on Ubuntu 12.04 and the stats collector is
> generating very high IO usage even when nothing appears to be happening
> on the system.
> I have roughly 150 different databases, each of which is running in 1 of
> roughly 30 tablespaces. The databases are small (the dump of most is
> are under 100M, and all but 3 are under 1G, nothing larger than 2G).
That's a lot of databases. I think your problem probably stems from
autovacuum madly trying to cover all of them. Backing off (increasing)
autovacuum_naptime to slow its cycle might help.
regards, tom lane