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3.06 How to set the RAM size Cloud Server Pro service guide

As for the vCPUs remember that every Gb of RAM is physically dedicated and guaranteed (no overbooking, no overselling). The amount of RAM for each individual Cloud Server can vary from 1 Gb to 32 Gb both for 32-bit and 64-bit operating systems.

Remember that if you set 4 Gb of RAM in a 32-bit Linux Operating System, of these 0.8 Gb will be available for the Kernel and 3.2 Gb are the maximum available to the machine. This limit is not due to a choice of Aruba but is linked to the architecture of the Operating Systems (https://msdn.microsoft.com/en-us/library/windows/desktop/aa366778(v=vs.85).aspx).

It is possible to change the amount of RAM at any time, after turning the machine off. The quantity of RAM in the virtual machine can be changed at any time and for any need, either temporary or permanent. The increase in the amount of RAM increases the performance of the virtual machine in terms of speed and power in the execution of applications.

The amount of RAM is closely related to the use that the user intends to make of the Cloud Server. Aruba recommends the following quantities:
 
Cloud Server Type GB of RAM
minimum recommended
Web Server 2 4
Web Server LAMP 2 4
Web Server WAMP 2 4
Mail Server 1 2
Database Server 2 4
Storage Server 1 2
Virtual Desktop 2 6
Firewall 1 2
Servers dedicated to online Gaming 6 8
Basically Windows Operating Systems require more resources than Linux Operating Systems, even in terms of the amount of RAM installed.

If you consider the amount of RAM installed to be too much it is always possible to reduce it.
It should be noted that if the Server Cloud is "archived" the cost of the RAM will not be subtracted from the credit for the entire archiving period and the related resources will be released. At the time of restoration the amount of RAM will have to be reconfigured.