From: Stewart, John (johnsartesyncp.com)
Date: Tue May 02 2006 - 16:49:26 CDT

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I've got a couple of different sites for which I need to rebuild mail
gateways (running postfix).

At our big site, we've got something on the order of 25-30k messages per
day. I'm planning on running postfix with greylist and possibly an
amavisd-new/spamassassin scanner on the same box. This is going to be both a
gateway and smart host for incoming/outgoing.

At a smaller site, they only need a new outgoing server, with only about
2000 messages a day.

For the small site, I'm thinking a Sun X2100 server with mirrored SATA
disks. This is one of their new cheap x86 (AMD) servers. Perhaps a second
one just for redundancy, but I have to think that even with the OS and
postfix queues on a single spindle (just mirrored), 2000 should be no
problem.

For the bigger site, I'm thinking one of the slightly beefier Sun boxes with
some SCSI disks. Currently our mail gateway is on a Sun E250, and I think
anything new from Sun with SCSI disks is going to be beefier than that.

But I wonder how we get hard numbers on the IO operations per second that we
require in order to have some real data on justification for hardware...
googling around and searching the postfix list, I'm finding occasional
individual sizing questions, but no good howtos on sizing in general for
postfix. Any suggestions?

thanks

johnS

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