A force start is required when checkpoint start encounters I/O errors
while reading files, or invalid data. The procedure is the same as for
cbeckpoint start except that unreadable or invalid files are bypassed.CP The CP commands allow you to control the virtual machine from the
terminal, much as an operator controls a real machine.Virtual machine
execution can be stopped at any time by use of the terminal's attention
key (for3066 and 3270 terminals, the ENTER key is used); it can be
restarted by entering the appropriateCP command. External, attention,
and device ready interrupts can be simulated on the virtual machine.Virtual storage and virtual machine registers can be inspected and
modified, as can status words such as thePSi and the CSW. Extensive
trace facilities are provided for the virtual machine, as well as a
single-instruction mode. Commands are available to invoke the spooling
and disk sharing functions ofCP. CP commands are classified by privilege classes. The V8/370 directory entry for each user assigns one or more privilege classes.
The classes are primarysystem operator (class A), system resource
operator (class B), system programmer (class C), spooling operator
(class D), system analyst (class E), service representative (class F),
and general user (class G). Commands in the system analyst classmay be
used to inspect real storage locations, but may not be used tomake modifications to real storage. Commands in the operator class provide
real resource control capabilities.System operator commands include
all commands related to virtual machine performance options, such as
assigning a set of reserved page frames to a selected virtual machine.
For descriptions of all theCP commands, see the !£f and the 82 IBM VM/370 System Programmer's Guide
while reading files, or invalid data. The procedure is the same as for
cbeckpoint start except that unreadable or invalid files are bypassed.
terminal, much as an operator controls a real machine.
execution can be stopped at any time by use of the terminal's attention
key (for
restarted by entering the appropriate
and device ready interrupts can be simulated on the virtual machine.
modified, as can status words such as the
trace facilities are provided for the virtual machine, as well as a
single-instruction mode. Commands are available to invoke the spooling
and disk sharing functions of
The classes are primary
operator (class B), system programmer (class C), spooling operator
(class D), system analyst (class E), service representative (class F),
and general user (class G). Commands in the system analyst class
used to inspect real storage locations, but may not be used to
real resource control capabilities.
all commands related to virtual machine performance options, such as
assigning a set of reserved page frames to a selected virtual machine.
For descriptions of all the