One other thing: Mail gateways do a lot of nslookup operations, so make
sure you run "nscd" (name service cache daemon) and adjust it so it
caches more than the default number of hosts. So for example, the one
section in /etc/nscd.conf dealing with host names might contain
something like this:
enable-cache hosts yes
positive-time-to-live hosts 3600
negative-time-to-live hosts 20
suggested-size hosts 1213
check-files hosts yes
persistent hosts yes
shared hosts yes
max-db-size hosts 33554432
The suggested size is usually set to "211" as a default.
As to disk I/', I'd definitely run vmstat and iostat to see if the
values look reasonable. I'd also run "swapon -s" to make sure you have
enough swap space, and of course "top" to get a general idea of how your
systems are running.
--Tobias
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