On Thu, 20 Mar 2003, Gordon Messmer wrote: .. > The new system cost about $15000. It is built with an NFS backend > running Red Hat Linux 7.3 on a 1TB RAID 5 set attached to a 3ware 7500 > card, one 1.8 Ghz CPU and 1GB of RAM. There are two Courier servers > configured identically, load balanced with DNS round-robin. Each has an
I would strongly suggest taking a good look at: http://www.linuxvirtualserver.org/Documents.html specifically http://www.linuxvirtualserver.org/VS-NAT.html DNS round-robin has /so/ many problems -- you have to set the ttl incredibly low for it to work at all, and /many/ email clients /cache/ the IP beyond the ttl. Thus, if you name your servers A and B, and A goes down (and A is the "primary"), many clients will continue trying to contact A despite it being down and the ttl having long expired. The LVR/NAT and LVS/DR solutions are much "better" from a high level perspective. Heck, you could probably get away with a Pentium 200 level machine as the NAT/DR "router" - it just passes and mangles packets. -- Applying computer technology is simply finding the right wrench to pound in the correct screw. Jon Nelson <[EMAIL PROTECTED]> C and Python Code Gardener ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ courier-users mailing list [EMAIL PROTECTED] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
