IOCP and VM dynamic I/O configuration

VM allows you to dynamically modify the I/O configuration without performing:

Power-on reset (POR) of the CPC
Initial program load of the operating system.

On z/VM® you can use HCD and HCM to add, delete, or modify the I/O definitions of logical partitions, PCIe functions, channel paths, control units, and I/O devices in the CPC. It also allows you to save the changes you made to the I/O configuration definition data set (POR IOCDS). You must use an IOCDS generated from an I/O definition file (IODF) to be able to dynamically modify the I/O configuration using HCD. For more information, see z/VM Dynamic I/O Configuration Planning and Administration, SC24-6044.

Alternatively, using VM CP commands, you can add, delete, or modify the I/O definitions of logical partitions, PCIe functions, channel paths, control units, and I/O devices in the CPC. Using the IOCP utility on CMS, you can write a new POR IOCDS containing the same I/O configuration changes. For more information, see the z/VM Planning and Administration, GA22-6974, and z/VM CP Command and Utility Reference, GA22-6974.