Resource Settings

The Resource pane of the virtual machine configuration window allows you to manage a number of CPU- and disk-related parameters.

Configuring CPU Parameters

On the Resource pane, you can configure two CPU-related parameters:

• CPU Units —guaranteed CPU power. This is a positive integer number, which determines the minimal guaranteed share of the CPU the virtual machine or Container receives. The virtual machine or Container can consume more than the guaranteed value if no other Containers are competing for the CPU and the CPU Limit parameter is not defined. Parallels Server Bare Metal consider one 1 GHz CPU to be approximately equivalent to 50 000 CPU units.
• CPU Limit —CPU limit, in percent or megahertz (MHz). This is the CPU limit the virtual machine or Container may never exceed. The range of allowed values is displayed to the right of the CPU Limit field.

Configuring Disk I/O Parameters

You can also configure the bandwidth a virtual machine is allowed to use for its disk input and output (I/O) operations. Limiting the disk I/O bandwidth can help you prevent the situations when high disk activities in one virtual machine (generated, for example, by transferring huge amounts of data to/from the virtual machine) can slow down the performance of other virtual machines on the Parallels server. By default, the I/O bandwidth limit for all newly created virtual machines is set to 0, which means that no limits are applied to any virtual machine. To limit the disk I/O bandwidth for a virtual machine, set the desired limit, megabytes per second (MB/s), in the Disk I/O Limits field.

Note: In the current version of Parallels Containers, the maximum I/O bandwidth limit you can set for a Container is 2 GB per second.

You can configure the disk input/output (I/O) priority level of a virtual machine. The higher the I/O priority level, the more time the virtual machine will get for its disk I/O activities as compared to the other virtual machines on the server. By default, any virtual machine has the I/O priority level set to 4. However, you can change the default priority level in the range from 0 to 7 by specifying the necessary value in the Disk I/O Priority field.