This message is the result of a MODIFY PATHS command. channel_path_id is a one byte hexadecimal number that gives a channel path id. path_group_id is an eleven byte hexadecimal number that gives a path group id. Storage controls use the path group id to identify the request path. A channel path id of '**' identifies the initial path group id that z/OS® sends to the storage control. A path_group_id of all zeros indicates that the path group is physically unavailable, or that all devices associated with the channel path were offline when the channel path was varied online.