Citrix Systems 6 manual Setting Control Domain Memory, Name Default Description

Xen Memory Usage

When calculating the memory footprint of a Xen host there are two components that must be taken into consideration. First there is the memory consumed by the Xen hypervisor itself; then there is the memory consumed by the control domain of the host. The control domain is a privileged VM that provides low-level services to other VMs, such as providing access to physical devices. It also runs the management tool stack.

Setting Control Domain Memory

If your control domain requires more allocated memory, this can be set using the Xen CLI.

Use the xe vm-memory-target-setcommand to set the amount of memory available to the control domain.

The xe vm-memory-target-waitcommand can be used to check if the control domain is currently at the requested memory target specified at the last use of the xe vm-memory-target-setcommand. xe vm-memory-target-waitwill not return until the actual memory usage of the control domain is at the target, or will time out if the target cannot be reached, for example when the target is lower than the actual memory requirements of the VM.

The following fields on a VM define how much memory will be allocated. The default values shown are indicative of a machine with 8 GB of RAM:

name	default	description
memory-actual	411041792	The actual amount of memory
		current available for use by the VM
		Read Only
memory-target	411041792	The target amount of memory
		as set by using xe vm-memory-
		target-set
		Read Only
memory-static-max	790102016	The maximum possible physical
		memory
		Read Write when the VM is
		suspended; Read Only when the
		VM is running
memory-dynamic-max	790102016	The desired maximum memory to
		be made available
		Read Write
memory-dynamic-min	306184192	The desired minimum memory to
		be made available
		Read Write
memory-static-min	306184192	The minimum possible physical
		memory
		Read Write when the VM is
		suspended; Read Only when the
		VM is running

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