thus Bob Beck spake:
IF you're only talking about around 300 users, you've probably not
got to worry about these questions - what you have will work very well
for what you are proposing, likely without any tweaks.
-Bob
* Samuel Moqux <[EMAIL PROTECTED]> [2006-07-07 10:56]:
Hi everyone,
I'm planning to deploy a SMTP(Sendmail) and IMAP(Cyrus) server on a
mid-sized organization(~300 remote users, dunno about messages/day),
and since is my first IMAP server (until now we do only POP), I have
some questions about sizing.
First, about hardware requirements. I had tought to use a Dell 1850,
2GB RAM with two controllers: a PERC4e/Si for system + sendmail queue,
and a PERC 4e/DC connected to a PV220s, with 7x300GB (half of
backplane) for imap data (4 or 6 discs in RAID-10 + 1 hot spare) . I
think it should be enough, but it's really? (the hardware it's already
bought, so I really hope so). Any recommendations about stripe size or
raid configuration?, which ami version to use? -stable one? How ami's
performance compares with FreeBSD's amr?
I understand that is advisable to run softupdates on the imap and
/var/spool partitions, and to disable fsck on boot, but what about
increasing buffer cache size? 5% of physical memory seems a bit low
for an I/O intensive app as Cyrus is.
About resource limits of _cyrus user and sysctl values, are there well
known values? Should I increase kern.maxfiles for example? I wouldn't
like to learn it at production time.
Well, this are my questions. May be the hardware is overkill for our
load, but sizing hardware without prior experience it's always a
difficult task, so if anybody wants to share their experience...
Thanks in advance,
Samuel
hm, two years ago i had to migrate a 20 user advertising company (not
very small mails ;) from 'exchange' to cyrus. because of weird
circumstances, i had to use a temporary setup for about two months. this
was an Amiga 1200 with 68040 turbo board, external SCSI HD, and 256MByte
RAM running Cyrus 2.2.x, Postfix 2.x, clamav and amavisd-new on NetBSD.
that's a really true story :) without amavisd-new, even less memory
would have been sufficient ;)
timo
