Duane, We use Alteons to do the load balancing and a pair of NetApp F810c's for the HA NFS system. I won't include any details since its easy enough to get the data from the guys at Netapp. We run 7 qmail/vpopmail servers with 3 mysql servers (one master and 2 slaves that are read only).
Scott ----- Original Message ----- From: "Duane Wylie" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, December 30, 2002 1:41 PM Subject: RE: [vchkpw] vpopmail clustering examples > 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 > > >