Today I was working set the max heap size for the IDM JVM using IManager and forgot to put the size on Megabytes so when I restart the eDirectory got the error:
Error occurred during initialization of VM
Too small initial heap
To manually fix this you need to add this lines on /etc/opt/novell/eDirectory/conf/env_idm
export DHOST_JVM_INITIAL_HEAP DHOST_JVM_MAX_HEAP DHOST_JVM_OPTIONS
and then restart. The do the change with iManager on the driverSet parameters (Misc).