2.3. XenServer product family virtual device support

The current version of the XenServer product family has the following general limitations on virtual devices for VMs. Note that specific guest operating systems may have lower limits for certain features. These limitations are noted in the individual guest installation section.

Virtual device	Linux VMs	Windows VMs
Number of virtual CPUs	32^[a]	8
Number of virtual disks	8 (including virtual CD-ROM)	8 (including virtual CD-ROM)
Number of virtual CD-ROM drives	1	1
Number of virtual NICs	7	7
Hotplugging virtual disks	add/remove	add only
Hotplugging virtual NICs	add/remove	add/remove
^[a]A maximum of 8 vCPUs are supported via XenCenter.

XenExpress, XenServer, and XenEnterprise also differ in the following ways that are relevant for creating VMs:

	XenEnterprise	XenServer	XenExpress
Amount of physical RAM on XenServer Host	up to 128GB	up to 128GB	up to 4GB
Number of concurrent VMs	50	50	4
Support for VLANs	yes	no	no
Support for shared storage	yes	no	no
Support for server pools	yes	no	no
Support for additional QoS control	yes	no	no

If you attempt to create a fifth VM with a XenExpress license, for example, an error message will appear, which suggests that you can upgrade your license and gives a web address for the XenSource website.