hi, list
I just did little 3-node LBL cluster for some network services and
especially for dbmail. each node is domU on separate xen server with
1024M RAM and 2 VCPUs. all this stuff is loadbalancing by LVS (which
live in separate domU too) and healthchecking by keepalived. works
great. I think (but not sure), that separating dbmail on different VMs
(even if you have only one physical server) is good idea, until dbmail
team will not implement multi-foo architecture. I do not strict tests
yet, but users said, that LBLed dbmail shows damn better robustness.
more taste things it's connection persistence which providing by LVS and
highly decreased annoying "opening folder..." pauses (thunderbird's
"feature"), high availability and better hardware utilization. if
anybody interesting, I'll post howto to wiki.
alexander
p.s. I believe that LBL advantages will works only if you have powerful
DB server
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