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

QUERY HOTIO
q hotio
HOTIO ON 0280-028F RATE 00032
HOTIO ON DASD RATE 00025
Ready;
Note that you see the results of both of the SET HOTIO commands you have
issued thus far with the last command that you issued as the first response in the
list. This response tells you that all DASD devices have a hot I/O rate of 25 and all
devices in the range X'0280' to X'028F' have a hot I/O rate of 32. Because the last
command you issued is the most recent hot I/O rate change, CP displays that
command first. In this example, if any of the devices in the range X'0280' to X'028F'
are DASD devices, they will have a hot I/O rate of 32, because your second
command overrides the global rate defined in your first command.
Here is what you would see if you issued a SET HOTIO command for a specific
device number followed by another QUERY HOTIO command:
set hotio 28e 124
Ready;
q hotio
HOTIO ON 028E RATE 00124
HOTIO ON 0280-028F RATE 00032
HOTIO ON DASD RATE 00025
Ready;
Note that you see the results of all three SET HOTIO commands you have issued
thus far and note that they appear in last in, first out order. This response tells you
that all DASD devices have a hot I/O rate of 25 and all devices in the range X'0280'
to X'028F' have a hot I/O rate of 32, except for the device at X'028E', which has a
hot I/O rate of 124. Again, if any of the devices in the range X'0280' to X'028F' are
DASD devices, then they will have a hot I/O rate of 32 (or 124) instead of 25.
Here is what you would see if you issued a SET HOTIO DASD DEFAULT command
followed by another QUERY HOTIO command:
set hotio dasd default
Ready;
q hotio
HOTIO ON DASD RATE DEFAULT
HOTIO ON 028E RATE 00124
HOTIO ON 0280-028F RATE 00032
Ready;
This response tells you that all devices in the range X'0280' to X'028F' have a hot
I/O rate of 32 (except for the device at X'028E', which has a hot I/O rate of 124)
and all DASD devices have the default hot I/O rate of 16. Note that you issued four
SET HOTIO commands and you only see three responses. Two of the commands
(the first and the fourth) affecting the same devices (DASD). Because your fourth
command completely overrode your first command, CP no longer needs to display
the results of your first SET HOTIO DASD command.
Here is what you would see if you issued a SET HOTIO command to turn hot I/O
detection off for a specific device followed by a final QUERY HOTIO command:
set hotio 28f off
Ready;
q hotio
HOTIO OFF 028F
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