I have installed Zimbra on a Centos 5 machine.
It has ~4,5GB of RAM but right after installation i started to get errors related to memory.
It still doesn't have any "real accounts" only test ones without any activity at all.
[zimbra@mail1 ~]$ java version
Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine.
[zimbra@mail1 ~]$ free -m
total used free shared buffers cached
Mem: 4500 3686 813 0 0 0
-/+ buffers/cache: 3686 813
Swap: 0 0 0
Why exactly this happens? Isn't 4GB of RAM enough to run zimbra?