On Fri, 27 Feb 2004, Steve Moore wrote: > I am trying to plan for MD/SA deployment here. I would like to get the > benefit of experienced MD/SA users' concerning performance. Our site > processes up to 500,000 messages daily. Our average message size is > 30KB. Our max mail message size is 100MB.
100MB??? Wouldn't 5 or 10 be more reasonable? > We have two AIX 5.1 machines > running commercial sendmail behind a Cisco local director for load > balancing. One AIX machine is a dual processor with 4GB of memory and it > has cpu and i/o wait below 30%. The other machine is a uniprocessor with > 1GB of memory and it also has cpu and i/o wait below 30%. Both machines > have separate spindles for /var/spool. We do not do AV on these > machines. That is accomplished at another layer. Our plan is to tag and > pass all mail along to the client. The only content analysis we are > interested in at the moment is spam probability. > My questions are as follows. > 1) Is it possible to process the current workload with the two machines > listed above once MD/SA is added to the mix? It's pushing it. The single-CPU box worries me. > 2) Should I expect a 20% scan time improvement by adding RAMdisk? You cannot run a high-volume MIMEDefang server *without* a RAMdisk. Consider it mandatory. > How would you rank the performance cost of each of the checks below? How > would you rank the benefit of each of the checks in calculating spam > probability? > 1) SA rbl checks. Cheap in terms of CPU; killers in terms of memory because network latency keeps processes hanging around. Avoid if possible. > 2) SA Bayesian analysis. Very good if everyone has his/her own Bayes DB. Of dubious value if it's a shared DB. > 3) SA Razor checks. Network tests can kill you because of latency. Let's say you're doing 500K messages/day, or around 7/second. If the razor server takes 3 seconds to respond, that's 21 slaves that back up waiting for a response. > 4) SA dns availability. Not sure what that one means. Regards, David. _______________________________________________ Visit http://www.mimedefang.org and http://www.canit.ca MIMEDefang mailing list [EMAIL PROTECTED] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang