In nonpaging mode, VS1 maps virtual storage normally; that is, it
puts these functions in the high addresses of virtual storage: theJES buffer pool, VTAM workspace, RTAM area, JES routines, resident
modules, and the pageable supervisor. By minimizing the virtual
storage requirements for these functions,VS1 can provide more
problem program partition space.
TheVS1 paging data set is not used in nonpaging mode. The VS1 system does not require page parameters and page packs. • It is possible to execute V=R jobs in nonpaging mode. The V=R line
is a valid IPL parameter and theV=R logic within VS1 is applicable.
However, any benefits from such operation would appear to be
questionable because the entireVS1 system functions V=R in nonpaging
mode.FASTNIP automatically forces nonpaging mode when the virtual machine
storage space is 1megabyte or largerc !2te: Although handshaking does not require nonpaging mode, may be
occasions te run aVS1 system in a virtual machine with a storage space
of 1megabyte or larger and not use nonpaging mode. To avoid initiating
nonpaging mede,specify the virtual storage space explicitly to VS1 in
response to messageIEA760A; for example: ROO, '6144'.
The following examples show whether nonpaging mode is initiated when
initializingVS1 in a V8/370 environment with handshaking. V8/370 Size = 768K OS/VS1 Virtual Storage Size = 6M IEA760A Response = 'EOB'
Nonpaging mede is not initiated, and the virtual machine storage space
is less than1M. l: VM/370 Size = 18 OS/VS1 Virtual Storage Size = 6M IEA760A Response = 'U' Nonpaging mode is initiated, and VS1 forces the virtual machine storage
space to 1 megabyte. TheVS1 system may not complete initialization
because of insufficient virtual storagespace. i8/370 Size = 4M OS/iS1 Virtual Storage Size = 4M IEA760A Response = ROO, '4096' Nonpaging mode is initiated, and the explicit response happens to equal
virtual machine storage space.Section 4. as/vs in a Virtual "achine 113
puts these functions in the high addresses of virtual storage: the
modules, and the pageable supervisor. By minimizing the virtual
storage requirements for these functions,
problem program partition space.
The
is a valid IPL parameter and the
However, any benefits from such operation would appear to be
questionable because the entire
mode.
storage space is 1
occasions te run a
of 1
nonpaging mede,
response to message
The following examples show whether nonpaging mode is initiated when
initializing
Nonpaging mede is not initiated, and the virtual machine storage space
is less than
space to 1 megabyte. The
because of insufficient virtual storage
virtual machine storage space.