Mutliple VMs for Tomcat cluster vs Multiple Tomcat instances on one physical box

Posted by Greymeister on Server Fault See other posts from Server Fault or by Greymeister
Published on 2010-12-27T15:28:05Z Indexed on 2010/12/27 15:55 UTC
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tomcat

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I'm working on a project that will be implemented into production using a cluster of Apache Tomcat instances and I'm looking for the best Hardware/OS solutions and VMs have come up as one option. I have run ESXi/ESX instances before for development and testing, but I'm curious for a hosting environment if having multiple VMs is actually worse than just configuring a server to host multiple instances of Tomcat. These are my guesses:

Pros for VMWare

Easier Maintenance/Backup for individual VMs (VMWare makes this easy)
Can remote login to individual VMs without having to give host access (security?)
Easier way to re-purpose machine for OS/Hardware changes

Pros for running on one Physical Machine

Overhead of only one OS (also no VMWare footprint)
Update OS/security changes once
One less administrative layer (No VM expertise required)

I'm curious if anyone has any other ideas about what the benefits would be for either option.

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