DirectPath I/O allows virtual machine access to physical PCI functions on platforms with an I/O Memory Management Unit.

The following features are unavailable for virtual machines configured with DirectPath:

Hot adding and removing of virtual devices

Suspend and resume

Record and replay

Fault tolerance

High availability

DRS (limited availability. The virtual machine can be part of a cluster, but cannot migrate across hosts)

Snapshots

The following features are only available for virtual machines configured with DirectPath I/O on Cisco Unified Computing Systems (UCS) through Cisco Virtual Machine Fabric Extender (VM-FEX) distributed switches.

vMotion

Hot adding and removing of virtual devices

Suspend and resume

High availability

DRS

Snapshots

See Cisco VM-FEX documentation for details on supported switches and switch configuration information.