Guaranteed memory and SWAP are two of the most important parameters that affect the performance of a Linux system.
Guaranteed memory is the amount of memory that will be allocated to a virtual machine and is independent of the available memory on the host.
The process of guaranteed memory works by adding a hardware layer to the system called a memory controller hub. This hardware provides a buffer for the system where it can store data and retrieve it when needed. This buffer is non-power dependent, which means that it will not lose data in the event of a power outage or power failure.
SWAP is another type of virtual memory that is used when there is not enough RAM to store all the data.
The operating system uses SWAP to store less active applications. These applications are automatically moved to the hard disk when they are not in use. This is done to free up memory space for the currently running application.
Less active applications can be anything that does not require immediate attention, such as a word processor or spreadsheet.