We're running a dozen tcServer instances (Tomcat 6.0) on a VMware ESXi cloud infrastructure. We haven't put vSphere in yet, but we're planning to. The only thing I can say here is that there ARE differences between running Tomcat on a VM and running it on dedicated hardware. I have problems with things I know I'm doing right, but they just don't work the same on a VM. I guess it has to do with the fact that the server is sometimes "swapped" out if it's not in use. I think this causes issues, particularly with clustering, which I have yet to make work in a way that I'm happy with.
The big one that I noticed right away is that anything that uses /dev/random will take forever to start. VMs have very little entropy in their pools because they don't have any real hardware. This means stuff that uses /dev/random for entropy (if it has security/SSL in it or is uses Random) will take several minutes to start (usually 3-5 in our tests). When they run, they run great. We're seeing a great improvement in performance running on VMware. It's just there seem to be a lot of little issues that no one else seems to have. This means I either have no idea what I'm doing (possible :) or things just run differently on VMs than they do on real hardware. Jon Brisbin Portal Webmaster NPC International, Inc. On Feb 17, 2010, at 3:39 AM, Daniel Dreier wrote: > Hello, > > I want to use tomcat 6.0 on a vsphere4 based Server. Are there known issues? > > best regards > > Daniel Dreier > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
