Hi, thanks for your advice, I'll try with some load tests. Fabio
Il giorno 13/giu/2012, alle ore 11:08, Simon Hobson ha scritto: > Fabio Sangiovanni wrote: > >> I need to setup an environment made up of multiple MTAs to accept >> incoming mail, in load balance configuration. > ... >> 2) x MTAs + 1 external policyd daemon (used by all MTAs) + 1 external db > > I've gone with that option for my little cluster > >> How will a single policyd daemon deal with the load of multiple >> (let's say 5) high-traffic (>20.000 mail/day/mta) MTAs? Of course >> I'll set the number of policyd concurrent threads accurately. > > I had some performance issues to start with, but then I did a > software update and a slightly newer MySQL server seemed to cure it. > From memory they related to the connection being lost between policy > server and DB engine. > > The next bottleneck I hit was with Postfix itself. Again from memory, > but I think it seems to be limited to about 2 messages/second/thread* > when calling the policy server. I did some stress tests and found > that the backend policy server could keep up with multiple hosts, > each running two threads, without having a particularly powerful host > (can't really give specs, dedicated virtual machine for the backend > policy server/DB running under Xen along with multiple other VMs). My > target was to handle about 20k messages/day total, but heavily biased > towards office hours and I wasn't worried about the backend being a > problem. > > * Actually, 2 recipients/second/thread. I was throwing large numbers > of messages, each with large numbers of recipients, into the queue on > multiple hosts. > > It's easy to throw lots of requests at the policy server with > something like netcat a short shell script to loop round lots of > times. I just captured a query from the detailed logs and used that > multiple times. > > -- > Simon Hobson > > Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed > author Gladys Hobson. Novels - poetry - short stories - ideal as > Christmas stocking fillers. Some available as e-books. > _______________________________________________ > Users mailing list > [email protected] > http://lists.policyd.org/mailman/listinfo/users > _______________________________________________ Users mailing list [email protected] http://lists.policyd.org/mailman/listinfo/users
