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

QUERY HOTIO
QUERY HOTIO
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Query
Authorization
Purpose
HOTIO
Usage Notes
Responses
Privilege Class: B
Use QUERY HOTIO to display the current hot I/O rate settings for devices in the
active I/O configuration. (The hot I/O rate is the maximum number of consecutive,
unsolicited interrupts per second that CP should allow from an I/O device before
refusing to accept input from it.) For information on how to change the hot I/O rate
settings for your system, see “SET HOTIO” on page 1254.
1. When you enter the QUERY HOTIO command, CP displays the current list of
hot I/O rate settings in a form similar to the SET HOTIO command you issued.
In some cases, you may see multiple response lines for specific devices
because their range and class overlap. When this happens, CP displays the
responses in order of precedence: last in, first out.
2. If you want to set the hot I/O rate before the system IPLs, use the
HOT_IO_RATE statement in the system configuration file. For more information,
see the z/VM: CP Planning and Administration book.
If you enter QUERY HOTIO, you receive one of the following responses for each
device range and class:
HOTIO ON device RATE rate
HOTIO OFF device
device
indicates the device or devices to which this hot I/O rate setting applies. The
variable device can be any of the following:
ALL DASD GRAF
rdev rdev-rdev SPECIAL
SWITCH TAPE TERMINAL
UR
The variables rdev and rdev-rdev represent a real device number
rate
is either:
v A decimal number from 1 to 62500 that indicates the hot I/O rate setting for
the specified device or devices
v The word DEFAULT, which indicates a hot I/O rate of 16 for the specified
device or devices.
Response 1:
816 z/VM: CP Commands and Utilities Reference
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