Am Mon, 2003-10-06 um 16.03 schrieb Fredrik: > Hello fellow sysadmins, > > I have been aproached about building a rather big mail system handling > 500.0000 existing accounts (running today on a windows based product (ick)) > with a growth about 50.000 new accounts per year. > The services needed is: smtp, pop3, imap4.
As mentioned before: Sounds like fun! :-) I recently build a similar mail-cluster with OSS only. Tough it's currently smaller (20k user) it was designed to grow as needed. I guess it could handle 500k user without any modification except additional machines. > I have used LVS for about 3y with good results for 30.000 acounts. > But this is certainly a bigger project. Should I go for alteon or any other > closed product or stick with LVS? I don't see any need for something other than LVS, especially not for a mail-cluster. If you have any doubts about the throughput of your balancer: a) Use Gbit interfaces and direct-routing if that's not enough (tough I doubt it) b) Use multiple MX records, each pointing to a separate set of balancers > My main concern is the storage. SAN? Well, I guess that's the only "problem" you'll have. Either you use some BIG SAN or NAS (NetApp, EMC) or you use your software to distribute it across multiple server. I did the later as it's probably much cheaper (haven't calculated for 500k user, just for 20k to 100k). Here's how: The MX server run Postfix with a MySQL backend for authentication (and spam-filtering, virus-scanning, server based filter, ...). Depending on the users maildir they access different server via NFS to store their Mail. Each of those is equipped with about 1TB disks to store the mails. The POP/IMAP server do the same thing vice versa. Real fun is backing up the data as you have lots of small files across multiple servers which are changing all the time as users access their mail via IMAP or receive something. For 500k user you'll probably want a quite good backup concept too. Using a SAN or NAS approach for storage might be an advantage here. > Anyone used supersparrow for source based load balancing? Nope. Don't see a reason why to use it here as LVS does everything (and more) I need for setting up something like this. As hardware planning might go "a little" in detail (and therefore become OT), feel free to contact me off-list. best regards, Markus -- Markus Oswald <[EMAIL PROTECTED]> \ Unix and Network Administration Graz, AUSTRIA \ High Availability / Cluster Mobile: +43 676 6485415 \ System Consulting Fax: +43 316 428896 \ Web Development -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
