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.

PRIMARY

Directs PPRC to suspend the PPRC volume pair and to reject all write data I/O to the primary volume except for ICKDSF media maintenance channel programs. PRIMARY is valid only when directed to a primary volume with the DEVN parameter. The ESS storage subsystem does not accept the CSUSPEND PRIMARY parameter, and fails the command.

Use the PRIMARY option only as part of an ICKDSF media maintenance procedure because it causes the storage control to unit check all application write I/O.

Note: PRIMARY is not valid with OPENDVCS(YES).

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 determined by what is supported by the host system's processor and configured for the device.

If you omit the parameter, the command is issued to the device that is logically in subchannel set 0. If a swap has occurred, this could be the device that was defined in an alternate subchannel set in the I/O configuration (IODF), with HCD.