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

QUERY DYNAMIC_I/O
Responses
5. To prevent anyone from issuing SET DEVICES commands after initialization,
use the ENABLE or DISABLE SET_DEVICES operands of the FEATURES
statement in your system configuration file. For more information about the
FEATURES statement, see the z/VM: CP Planning and Administration book.
6. To display the total amount (in bytes and pages) of available HSA storage
space, use the QUERY HSA command (page 820).
7. To change the amount of storage allocated for dynamic I/O changes, you must
change the percentage of allocated hardware system area (HSA) storage on the
CONFIG frame of the system console and then perform an initial machine load
(IML) or power-on reset (POR). For more information consult the operator’s
guide that documents your processor.
Response 1 (Installed, Enabled):
If someone installed and enabled dynamic I/O support on your processor, you
would see:
query dynamic_i/o status
Dynamic I/O changes are allowed on this system.
Ready;
Response 2 (Installed, Not Enabled):
If someone installed dynamic I/O support on your processor, but did not enable that
support, you would see:
query dynamic_i/o status
No dynamic I/O changes are allowed on this system.
Ready;
Response 3 (Not Installed):
786 z/VM: CP Commands and Utilities Reference
If no one installed dynamic I/O support on your processor, you would see:
query dynamic_i/o status
Dynamic I/O configuration is not supported.
Ready;
Response 4 (Installed, Enabled, Not Valid):
If someone installed and enabled dynamic I/O support on your processor, but your
existing I/O configuration is not valid, you would see:
query dynamic_i/o status
Dynamic I/O changes are allowed but the configuration is invalid.
Ready;
When your system enters configuration mode (either explicitly, by entering the SET
CONFIGMODE ON command, or automatically, by entering a dynamic I/O
command), CP turns the “valid bit” off in the channel subsystem. If your dynamic I/O
changes complete successfully, CP turns the valid bit back on before exiting
configuration mode.
If one of the following events occur while you are in configuration mode:
v The system abends,
v You issue a LOGOFF command,
v You issue a SHUTDOWN REIPL command,
v You issue a CLEAR RESET from the hardware console, or
v You issue a LOAD CLEAR from the hardware console,