I am trying to check Zimbra out and it fails the install.

I tweaked the install.sh to use 'rpm -ivv' as the command to install. Here's what happens... in the %post for core:

* /opt/zimbra/java/bin/java -client -Xshare:dump
Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine.

I've got 256MB of RAM - what is Java trying to do? Does the -X have anything to do with X11, I have no GUI on that server...?

Looking for anything.