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

Usage Notes
mm:ss
specifies the rate in minutes and seconds at which the device is to be examined
for missing interrupts. The maximum value for mm is 99 and for ss is 59. The
value is rounded up to the next multiple of five seconds.
OFF
specifies that missing interrupts are not to be detected for any devices within
the specified range. If you specify this operand without any device, missing
interrupt monitoring for all devices is stopped.
1. If z/VM is running virtually, missing interrupt detection defaults to OFF at IPL.
The default value is SET MITIME OFF.
When a real and a virtual system share a display device, the virtual system
should leave missing interrupt detection off for the shared display device. Under
certain circumstances, if the missing interrupt detector is active in the virtual
machine for the shared display device, the virtual machine operator may be
logged off.
2. The system default values at IPL time are:
SET MITIME DASD
00:15*
SET MITIME GRAF
01:10
SET MITIME UR
01:00
SET MITIME TAPE
10:00
SET MITIME SWITCH
05:00
SET MITIME MISC
12:00
*The DASD and TAPE system default values will be used only if the device
subsystems do not return a primary time-out value for the missing interrupt
handler.
3. If you specify a range of devices, rdev-rdev, it must be in ascending sequence;
otherwise, the command is invalid.
4. If you specify a value for :ss that is greater than 59, the command is considered
not valid. If you specify 00:00, missing interrupt detection for the devices is
stopped.
5. It may take up to 5 seconds longer than the interval specified to detect a
missing interrupt.
SET MITIME
6. When SET MITIME is issued, the new time interval is applied to any current
operation.
7. The most recent interval specified for a device is the interval currently in effect.
Keep in mind that when you enter the SET MITIME command for an entire
class of devices (such as all DASD or all tape devices), the system monitors all
members of that class at the new time interval.
For example, assume that the valid range of DASD addresses at your
installation is 190 through 400. If you enter set mitime 250-255 00:59 and at
some later point in time enter set mitime dasd 00:20 the current interval for
devices 190 through 400 is 20 seconds.
Chapter 2. CP Commands 1295