Virtual I/O (VIO) server is a virtualization technology by IBM. A Virtual I/O server is a logical partition (LPAR) that runs a trimmed-down version of the AIX operating system. Virtual I/O servers have APV support, which allows sharing of physical I/O resources between virtual I/O clients.

Figure: Veritas Dynamic Multi-Pathing in the Virtual I/O Server illustrates DMP enablement in the Virtual I/O Server.

For support information concerning running Dynamic Multi-Pathing (DMP) in Virtual I/O Server (VIOS), see the Veritas Dynamic Multi-Pathing Release Notes.

See the PowerVM wiki for more in-depth information about VIO server and virtualization:

http://www.ibm.com/developerworks/wikis/display/virtualization/VIO

For more information, see the PowerVM Virtualization on IBM System p redbook:

http://www.redbooks.ibm.com/redpieces/abstracts/sg247940.html