Virtual Storage Preservation VMSA VE Option During CP system generation, the installation can specify an option called the "Small CP Option". The Small CP option removes some of the normally resident CP nucleus functions that support remote CPo This effectively reduces the size of
the residentCP nucleus, making more storage available for the area where virtual
machine pages reside.
TheSmall CP option improves performance in environments where the real
processor storage size is 512K bytes or less.
Virtual storage preservation support is designed to preserve the contents of a virtuÂ
al machine if the system operator forces the machine off the system, ifVM/SP abnormally terminates it, or if VM/SP itself abnormally terminates.
The user can specify atVM/SP system generation time which virtual machines are
to be saved. The contents of these virtual machines are saved inDASD space that
theVM/SP system programmer must previously allocate via the NAMESYS macro. The user can force a priority for the order in which multiple virtual
machines are saved; he does this through theSA VESEQ operand of the NAMESYS macro. The saved virtual machine is restored to the user via the IPL command. Normal recovery procedures or problem analysis for the saved virtual
machine may then be initiated by the user. To preserve its privacy and security, the
automatically saved virtual machine is made available only to previously specified
users. This saved virtual machine can be loaded into either aV =R or a normal
non-V =R machine. Subject to certain restraints, the user can dynamically control the option to save or
not to save the contents of the virtual machine(VMSAVE), and in which DASD area to save them (if there is more than one DASD area). If the user has a single DASD area defined, VMSA VE can be enabled either by the VMSA VE directory
option or by theSET VMSA VE ON command. A single VMSA VE area can be
designated for use by multiple virtual machines. However, the area is allocated to
only one user at a time; the user who first enablesVNISA VE has priority. Normal
logoff, or invoking theSET VMSA VE OFF command relinquishes this VMSA VE
area.
The user with multipleDASD areas allocated must issue the SET VMSA VE name
command to enable theVMSA VE option. The SET VMSA VE OFF command
disables theVMSA VE option. Also, to relinquish the VMSA VE area, the user
may issue theSET VMS AVE OFF command, or logoff, or issue the SET VMSA VE name command specifying another area. The DASD save area can only
be relinquished by the owner of the data of the save area if data is stored in it. If
there is a saved system in theDASD area, the way to relinquish the area is for the
owner of the saved area to logon and issue theSET VMSA VE name command for
that area, then issueSET VMSA VE OFF command or LOGOFF. The current status of the VMSAVE option (ON or OFF) can be obtained from the
QUERYSET command. The QUERY VMSA VE command displays the current
status of theVMSAVE option, the names of the areas allocated for the user, the
page frames of each area, and the date and time that their contents were saved.
VM/SP 7
the resident
machine pages reside.
The
processor storage size is 512K bytes or less.
Virtual storage preservation support is designed to preserve the contents of a virtuÂ
al machine if the system operator forces the machine off the system, if
The user can specify at
to be saved. The contents of these virtual machines are saved in
the
machines are saved; he does this through the
machine may then be initiated by the user. To preserve its privacy and security, the
automatically saved virtual machine is made available only to previously specified
users. This saved virtual machine can be loaded into either a
non-
not to save the contents of the virtual machine
option or by the
designated for use by multiple virtual machines. However, the area is allocated to
only one user at a time; the user who first enables
logoff, or invoking the
area.
The user with multiple
command to enable the
disables the
may issue the
be relinquished by the owner of the data of the save area if data is stored in it. If
there is a saved system in the
owner of the saved area to logon and issue the
that area, then issue
QUERY
status of the
page frames of each area, and the date and time that their contents were saved.
VM/SP 7