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.