Re: [exim] Spamassassin + Exim4 high IO Wait

On Tue, Sep 19, 2006 at 03:51:52PM +0100, Mark Adams wrote:
> >
> > Do you have auto-learn and SA's bayesian mode enabled? If
> > so you may be seeing a lot of write activity from SA
> > updating its dictionaries (especially if you're using the
> > default GDBM back-end, which is very inefficient).
>
> Currently this isn't enabled, I've also disabled the URIDNSBL and
> Hashcash checking options incase this was the issue - but this has not
> helped the situation

neither of those should be doing significant disk IO.

> > To assist in diagnosing, you might want to install iostat
> > or similar and see what pattern of activity (number of
> > transactions, number of blocks read/written) you're seeing
> > during mail scanning.
>
> Have been using iostat and sar, but will have to look into the stats
> these are getting in more detail, only problem being they take the stats
> on the whole logical volume group, which includes the SMB services. Do
> you know if there is any way to get iostats on a specific process?

not under Linux as far as I know, though it may be
possible to use oprofile's output to infer this.

--
``If you can tell good advice from bad advice, you don't need any advice.''