z/VM: CP Commands and Utilities Reference - z/VM - IBM

e specified in the system configuration file OPERATOR_CONSOLES statement to
designate the integrated 3270 as an eligible operator console. The integrated 3270
device is reported as SYSG in operator console messages and command
responses.
Virtual suport is enabled using a new SYS3270 or SYSGRAF option on the
TERMINAL command. The QUERY TERMINAL command provides the status of
this option.
Guest IPL from SCSI Disk
The SET LOADDEV command was added to identify the location of a program to
be loaded as a result of a guest IPL from SCSI disk. This new command allows
class G users to define or change the information to be used for an IPL from an
FCP subchannel. The QUERY LOADDEV command was added to allow class G
users to display the information saved by previous SET LOADDEV commands.
QDIO Performance Assist for V=V Guests
Use the new SET QIOASSIST command to control the queue-I/O assist (QDIO
performance assist for V=V guests) for a virtual machine. This interpretive-execution
assist applies to devices that use the Queued Direct I/O (QDIO) architecture,
HiperSockets
devices, and FCP devices. On processors that support the
queue-I/O assist, there is a performance benefit for I/O performed with the
queued-I/O protocols. With the aid of the assist, I/O interruptions can be passed
directly from the hardware to the virtual machine. In addition, certain QDIO-related
instructions can be interpretively executed by the processor, without z/VM’s
involvement. The QUERY QIOASSIST command was added to determine the
current status of the queue-I/O assist. The QUERY VIRTUAL FCP and QUERY
VIRTUAL OSA were also updated to support this new function.
Command Response Suppression
The new SILENTLY command executes another CP command and suppresses its
responses, if that command is so enabled. The new SILENT option on the DEFINE
COMMAND / CMD and MODIFY COMMAND / CMD commands enables the target
command for response suppression.
VM/HCD
FICON
The new Query HCD command displays the HCD status, and if HCD is active, also
displays the current production IODF, dynamic hardware change status, software
configuration control information, and recovery status. The new DISABLE HCD
command disables the I/O-configuration capabilities of HCM and HCD for the rest of
the current IPL of your VM system, transferring I/O configuration control to the
applicable CP operator commands. A new NOHCD option on the SET IPLPARMS
command specifies that CP should ignore any IODF statement in the system
configuration file, in which case HCD will not be used for I/O configuration.
Cascading Switches
When CP is in control of the dynamic I/O capabilities of the system, the DEFINE
CU and MODIFY CU commands can now be used to dynamically define a FICON
cascaded switch topology to the system. When HCD is in control of the I/O
capabilities of the system, the ACTIVATE command from the VM/HCD service
virtual machine can now be used to define a new I/O configuration which contains a
FICON cascaded switch topology.
xxii z/VM: CP Commands and Utilities Reference