Sorry 'bout sending that last message as 'Super-User'... We're using F5's load balancer and it's been working great for us. It has similar features as the Foundry switch you mentioned (and the service monitoring is great!).
The main worry I have at this point is the NFS server. Even though the file system in question is RAID 5, and is in a separate disk enclosure, I don't like having that one NFS server as a single point of failure. Is anyone using some sort of HA storage solution? If so, care to share details? Thanks, Duane Wylie -----Original Message----- From: Andre Fortin [mailto:[EMAIL PROTECTED]] Sent: Monday, December 30, 2002 11:53 AM To: [EMAIL PROTECTED] Subject: RE: [vchkpw] vpopmail clustering examples We have a very similar set up. We have a third machine as the MySQL master which doesnt directly interact as a mail server, but it makes the MySQL database triple-redundant without sacrificing performance. For load balancing/redundancy, we are using Foundry (http://www.foundrynetworks.com/) switches with the SLB (Server Load Balancing) code. Very powerful; it not only detects if the server is running, or listening to port 25/110, but it actually understands SMTP and POP3 and will make sure the SMTP and POP3 servers are responding properly as part of its 'heartbeat' tests.. So, for example, if you had a machine that had a problem and would still listen to port 25 but couldnt actually answer with a '220', it would be treated as 'offline' instead of opening dead connections for clients.. It also allows you to load balance between X number of servers rather than just failing over in 'worst case scenario' situations.. Andre
