On Thu, Dec 06, 2001 at 12:51:49AM -0600, Austad, Jay wrote: > And > putting your spool directory on the last partition on the disk helps a ton > also, because the disk is spinning faster towards the outside edges. You > can typically increase your seek times by a couple of milliseconds doing > this, which doesn't sound like a lot, but over 10,000 seeks, this adds up to > about 20 seconds, and when doing a run through the queue you can easily need > to do that many seeks as fast as possible. You're right about the rotational speed of the disk, but don't the sectors get wider as you get out there? If you move the head, the worst case is that you have to wait for a full revolution once you hit the right track, but angular velocity is the same everywhere, so I guess I'm not seeing how this gives you faster seek times. > I typically have a ton of mail > on my postfix boxes, so moving my spool directory to the last partition on > the disk has increased my performance by quite a bit. I've also started > doing remote logging from all of my mailservers. By doing this, postfix > doesn't have to fight at all with syslog for disk access, and that has also > increased my performance. > > Basically, I went from an average of 160ms to inject a message into the > queue using the default settings, to now about an average of 35ms for each > message injected after tweaking everything. Installing the 20011127 > snapshot brought me down from 60ms to 35ms just by itself. Doesn't this say that the disk partitioning had no measurable effect? Of course, putting it on a device that isn't being asked to fly off to other parts of the disk will be a big speed up, but I thought you had that already. I'm not arguing with you, just trying to get clear. Thanks, Phil -- "Trying to do something with your life is like sitting down to eat a moose." --Douglas Wood