On Thu, Apr 19, 2001 at 05:00:00PM -0300, jpablo wrote:
> hardware requirements for high traffic qmail/vpopmail instalations.
define high traffic.
> In a heavy loaded machine, with a lot of maildirs, wich will
define lot of maildirs.
> be the bottleneck? Disk i/o? CPU? Memory? Network troughput? If
> any of you are running high-load qmail servers please tell me the
> quantity of maildirs and the hardware used. Thanks in advance.
We have a medium sized POP3 server.
16000 users (i.e. "Maildirs")
300000 pop3 connects/day (about 50% remote access, from "outside" of
our networks, causing smtp after pop enabling).
both plain pop3 and ssl tunneled pop3 supported
50000 SMTP connects/day
60000 messages per SMTP/day
130000 deliveries a day (we do an extra delivery per message for
accounting reasons)
The machine is also running a few small mailing lists, a webmail
interface (perl + apache), a MySQL database (user authentication)
and a djbdns dnscache server (cachesize 100 MB).
The bandwidth in/out is approx the same proportion throughout the day
and is at 300 KByte/s (i.e. 150 KBs in + 150 KBs out) during prime time
(9 to 18) with a few rare peaks up to 300-500 KBs
We have a range of 15 to 50 parallel pop3 connections during prime time hours.
Medium is around 25-30.
The max average load in a 15 minute interval is usually not over 0.5
$ swapinfo
Device 1K-blocks Used Avail Capacity Type
/dev/amrd0s1b 1048448 0 1048448 0% Interleaved
The machine is
FreeBSD 4.2-RELEASE
CPU: Pentium III/Pentium III Xeon/Celeron (796.54-MHz 686-class CPU)
dual processor
real memory = 536805376 (524224K bytes)
amr0: <AMI MegaRAID>
amr0: <Series 490> Firmware H795, BIOS 2.03, 32MB RAM
amrd0: <MegaRAID logical drive> on amr0
amrd0: 70004MB (143368192 sectors) RAID 5 (optimal)
ahc0: <Adaptec aic7896/97 Ultra2 SCSI adapter>
aic7896/97: Wide Channel A, SCSI Id=7, 32/255 SCBs
ahc1: <Adaptec aic7896/97 Ultra2 SCSI adapter>
aic7896/97: Wide Channel B, SCSI Id=7, 32/255 SCBs
fxp0: <Intel Pro 10/100B/100+ Ethernet>
I'd say this machine is currently well prepared for at least the double
number of users without any problems.
\Maex
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