EVMS performance/design question

I've been moving mail to a Cyrus server on a new system, and it's
speed seemed slow to me (I could only add c 20 messages/second).  I
would like to run some tests with different options, but wanted to
check here if they are meaningful.

The system uses EVMS and LVM, and there's only one physical disk
underneath it all.  My understanding is that both do lots of
fsync'ing.

If I set up separate regions from the LVM container, will an fsync on
one of them only sync the region, or will it sync some larger object,
such as the container or the physical disk?

If I disable sync'ing on one of the logical volumes (via the
filesystem or linux mount options--I've never done it, so I'm not sure
how it goes), will that be effective?  (No, I don't think I'd disable
it permanently, but I might for the migration.)

I'm currently using ReiserFS v3, and a linux 2.6.17 kernel.

Of course, any other suggestions about improving performance with my
existing hardware (Intel P4 with hyperthreading and a SATA disk) would
be great too!

Thanks.
Ross Boylan

P.S. If you could cc the cc address, I'd appreciate it.  I'm not
subscribed through that one.

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