Hi There,
We just invested in a Dell 2550 with 2 GB RAM, 4 x 18GB SCSI disks,
addon Intel Express Pro card plus 2 on boards with a broadcom 5700 GBit card
and another Intel Express Pro, the disks are mirrored using Linux software
RAID 1 and we have the services SMTP on our Gbit card and Imap on the other
card, we will use the third card for pop/mailman web interface. Dual 1.2GHz
PIII's coppermines I think.
Attached to the server is a Winchester Systems Raid array - FlashDisk -
configured in RAID 5 mode and with a couple 9GB disks coming down to about
87GB space for /home for about 10,000 University student, faculty and staff
mail stores. We may even put webmail onto this machine.
Hope this helps.
Cheers,
Aly.
-----
Aly S.P Dharshi
[EMAIL PROTECTED]
System Administrator ORS Servers
Student - University of Lethbridge
----- Original Message -----
From: "Sam Varshavchik" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, January 09, 2002 7:07 PM
Subject: [courier-users] Re: rich man (company) mail system setup
> Roger Thomas writes:
>
> > if sky is the limit, what is the best/recommended mail system setup that
i
> > should pursue to have an optimised courier/qmail/ldap setup that is
going to
> > host couple of thousands of users?
> >
> > - do i buy a fat server, install everything inside?
>
> A Pentium 100 should be enough for "a couple of thousand" users, unless
you
> are talking about a user profile waaaaaay outside the bell curve (100mb
> mailboxes each, extensive searches, etc...)
>
> > - do i buy 3 server each for qmail, ldap and courier imap?
> > - performance issue ?
> > - server memory size?
> > - number of cpu ?
> > - max number of user per server. how do i limit this ie to implement,
say, 5000
> > users on server A and the next 5000 users on server B so on and so
forth?
> > - can i use your suggestion for a distributed architecture?
>
> An intelligent answer will require more information, such as the expected
> usage profiles. Otherwise, you'll have to do with a generic answer that's
> based on the center of the bell curve. The answer for that, as I said, is
> that a cheap Pentium will be enough.
>
> In general, I'll spend all my money on the hard disks. You want to get
high
> qualify, fast, SCSI hard disks that are rated for the highest MTBF you can
> get, and you want to stick them in a fault tolerant RAID box. That's
where
> your family jewels end up ultimately. Everything else can be replaced or
> upgraded without losing any data: server CPU, server RAM, the network
> architecture. Having to replace the disks is the only thing that you want
> to avoid at all (excepting, of course, routine RAID failures that can be
> hot-swapped right away).
>
> For insurance, get a big tape and dump the mail store to tape each day, so
> even if the disks and the raid boxes blow up, you'll cut your losses.
With
> maildirs you can do this live. The tape is only insurance, design the
disks
> so that they never fail in the first place.
>
> I hear that some high end RAID boxes come with slots that swallow tapes,
and
> do the backups by themselves. That just rocks.
>
> --
> Sam
>
>
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