Validating I/O paths

The IOSPTHV macro enables authorized callers to determine if a channel path to a device is valid without changing the online/offline status of a path. It recognizes a channel path as valid if it is available. A path is considered available if an I/O operation can be initiated down a path, and the device can be selected. Validation does not, however, guarantee that the device and path are error free, because intermittent errors can exist.

You can find more specific information about the IOSPTHV macro in z/OS MVS Programming: Authorized Assembler Services Reference EDT-IXG.