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
>
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