Optional parameters

OPENDVCS

Specifies whether Open System (fixed block) devices or CKD devices are addressed in the required parameters of this command. The values are:

NO: The required parameters address CKD devices. The default is NO.
YES: Specifies that the required parameters in this command target fixed block devices using a CKD access device.

SUBCHSET

Specifies the subchannel set in which the command is to be issued. The subchannel set where the I/O will be issued is the subchannel set as defined in the Hardware Configuration Dialog (HCD). The valid values are the subchannels supported by the system.

If you omit the parameter, the command is issued to the device that is currently logically in subchannel set 0. If a swap has occurred, this could be the device that was physically defined in an alternate subchannel set.