To increase Virtual Machine Memory in the OVM Manager GUI ?

To increase Virtual Machine Memory in the OVM Manager GUI, Please follow the following steps 


1. Using Oracle VM Manager GUI:

2. Login to Oracle VM Manager (GUI).

3. Select the VM and click on edit.

4. Check the assigned "Max. Memory (MB):" and "Memory (MB):".

5. If the "Max. Memory (MB):" is the same as "Memory (MB):", then you have to shut down the VM to increase the "Max. Memory (MB):" and "Memory (MB):".

6. If the "Max. Memory (MB):" is higher than the "Memory (MB):", then you can increase the "Memory (MB):" till "Max. Memory (MB):".

7. Ensure the "Memory (MB):" should not be higher than "Max. Memory (MB):"

8. Click on Save.

Login to the VM and verify allocated memory. 

Memory allocated to the VM can be check by Oracle VM Manager either by going to the Server and 
VM tab or by going to Health tab in GUI  then selecting Server and VM statistics.