[K12OSN] Email Server Major Slowdown

[mrok12osn at eastgranby.k12.ct.us]

Today our email server had two major slowdowns and several more less major
slowdowns.  It is built from the K12LTSP CD's plus some supplementary
programs.  We use postfix, UWimap, squirrelmail, MailScanner,
spamassassin, and f-prot antivirus on FC5.  Iptables is the firewall.

When the major slowdowns occurred, the hard drive as indicated by HD
activity light was very busy.  Is there a utility that I can use to track
down what task(s) were causing the HD activity?

The email server is normally not very busy.  Yesterday, we received about
2200 messages of which about 1400 were identified as spam.

Mark Orenstein
East Granby, CT School System