Hi Raul, On Fri, Oct 19, 2012 at 04:36:27PM +0000, Raul wrote: > Hello, we want to use haproxy to balance Exchange 2010. > We're testing version 1.4 and version 1.5dev12. > Statistics Reports in version 1.4 the max number of sessions in frontend is > the > same backend max sessions but in version 1.5 the number of sessions in the > backend is ten times lower than in frontend. > Haproxy 1.5dev12 works very well but we hope to 70,000 sessions backends. > Since > this is a development version, has it limitations in max sessions backend?
The "sessions max" reported in the backend is not a maxconn, it translates the "fullconn" parameter only. There is no maxconn limit in a backend, a backend accepts everything the frontends pass it. The fullconn parameter is used only for dynamic queuing combined with the servers' minconn parameter. Several users reported that it was complex to tune in 1.4 and the general consensus was to set it to around 10% of the maximum load, so in 1.5 haproxy now does the calculation for you, it sets it to 10% of the sum of the maxconn of the frontends that branch to the backend. Unless you're playing with dynamic queuing, you don't have to care about this parameter. Willy
