Hi, I'm looking for help to find a solution to strange slow downs on a long living XStream/illumos server. This server runs 5-6 zones, on intel 8 cores, 24GB ram, separate boot on sata mirror rpool, and data on sas raidz pool. Two of these zones run essentially the same software: apache, tomcat, cyrus, postfix, amavis, postgres Apache front ends http to tomcat, running our collab webapps, working all the day on postfix smtp, cyrus imap and postgres db. 1st zone is our own dev machine, running 4-5 users actually on all the stack. 2nd zone is our customers machine, running around 1000 users on all the stack, separated into about 10 cyrus domains and their separated 10 instances of both webapps and databases. Recently, it happens from time to time (1-2 times a week) that everything starts to slow down. Stopping one or the other zone's tomcat/apache gets everything back: somtimes it's ours, sometimes it's the cloud. Ok, at first sight one would say: your web app has problems. But....then why do I have hard times connecting via ssh to the zones during this situations? Login takes minutes, password to shell another lots of minutes, but prstat/top don't show any cpu high usage on global zone, nor inside the zones. Then I stop one tomcat (sometimes one, sometimes the other), and verything gets free. Imap processes during these times are around 1000 in one machine, around 100 on the other. Then they abruptly gets down, obvioiusly the web app closes connections. So my question is....how can I dig this problem? I would think that if the webapp is the problem, iniside java/tomcat, I should not experience problem during ssh. Any possible limits on socket? Any other idea? Thanks.... Gabriele
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