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

You will see the following response when you do not specify any HOT_IO_RATE
statements in the system configuration file and you have not issued any SET
HOTIO commands:
HOTIO ON ALL RATE DEFAULT
Note that DEFAULT=16, so all devices in the active I/O configuration have a hot I/O
rate of 16.
Response 2:
HOTIO ON DASD RATE 00050
This response indicates that you either:
v Issued a SET HOTIO DASD 50 command, or
v Specified HOT_IO_RATE DASD 50 statement in your system configuration file.
Although they are not listed, all other devices in the active I/O configuration have a
hot I/O rate of 16 (DEFAULT). In most of the QUERY HOTIO responses you see,
CP will not explicitly tell you that I/O devices are using the default hot I/O rate of 16.
There are only two reasons you will see DEFAULT in a QUERY HOTIO response:
1. When no HOT_IO_RATE statements or SET HOTIO commands have been
processed (as you saw in Response 1)
2. When you use a HOT_IO_RATE statement or SET HOTIO command to change
the hot I/O rate for one or more devices and you use a second statement or
command to change that same device (or devices) back to the default. (You will
see an example of this for DASD devices in Response 3.)
Response 3:
This example shows you the responses you would see before and after issuing
various SET HOTIO commands.
The following response indicates that all devices in the active I/O configuration are
using the default hot I/O rate of 16:
q hotio
HOTIO ON
Ready;
ALL RATE DEFAULT
Here is what you would see if you issued a SET HOTIO DASD command followed
by a QUERY HOTIO command:
set hotio dasd 25
Ready;
q hotio
HOTIO ON DASD RATE 00025
Ready;
Note that you no longer see the response line that indicated all devices were using
the default.
Here is what you would see if you issued a SET HOTIO command for a specific
range of devices followed by another QUERY HOTIO command:
set hotio 280-28f 32
Ready;
QUERY HOTIO
Chapter 2. CP Commands 817