Directory Update-In-Place Support
This facility supports the Directoryftaintenance program product
(Program No. 5148-XE4). It provides the capability for virtualmachines with privilege class B to update the CP object directory without running
the directory(DMKDIR) program. The CP directory exists in two forms:
a.Source directory -consists of the set of entries that defines all
virtualmachines in a Vft/310 system.. Each virtual machine is defined
by a set of statementsknown as an entry that varies according to the machine specifications b. Object directory -consists of the salle information
the source directory but in a condensed control
readableformat. as contained in
block,machine Prior to Release 6, the directory program was invoked to translate
the entire source directory to the object directory and write the object
directory to asystem DASD device for each directory change. Given the
large number of directory entries consisting of vast numbers of
statements, this manner of directory updating was neithertime nor
resource efficient. By the introduction of the newDIAGNOSE X'84'
instruction selected data fields in an online object directory are
updated without a full directory programcompile run, thereby providing
an efficient alternative to running of the directoryprogram. The
selected data fields are among those that do not require a change in the
object directory size when they are updated. The directoryprogram must still be run, however, when updating requires either an expansion or a
contraction of the object directory entries.Two new copy control blocks, UCNTRL and UIPIRftS, are used in the new module DMKUDU to perform directory updating.
Formore detailed information on the Directory Maintenance program product (program NO. 5148-XE4), refer to the following publications:
LicensedProgram Design Objectives General Information Manual Licensed Program Specifications
GC20-1835
GC20-1836
GC20-18315C20-1839 VM/310 Directory Maintenance program Product Guide for
GeneralUsers 5C20-1840 VM/310 Directory Maintenance program Product Installation and System Administrator's Guide LY20-0889 VM/370 Directory Maintenance Program Product program Logic
ManualSRL AND PROGRAM LOGIC PUBLICATIONS The following publications contain inf or ilia ti on
update-in-place support:GC20-1807 System Program.er's Guide
GC20-1821Operating Systems in a Virtual Machine 5Y20-0884 Data Areas and Control Block Logic
on5Y20-0886 System Logic and Problem Determination Guide, vol. 1
1-24IBM VM/370 Release 6 Guide
directory
This facility supports the Directory
(Program No. 5148-XE4). It provides the capability for virtual
the directory
a.
virtual
by a set of statements
the source directory but in a condensed control
readable
block,
the entire source directory to the object directory and write the object
directory to a
large number of directory entries consisting of vast numbers of
statements, this manner of directory updating was neither
resource efficient. By the introduction of the new
instruction selected data fields in an online object directory are
updated without a full directory program
an efficient alternative to running of the directory
selected data fields are among those that do not require a change in the
object directory size when they are updated. The directory
contraction of the object directory entries.
For
Licensed
GC20-1835
GC20-1836
GC20-1831
General
Manual
update-in-place support:
GC20-1821
on
1-24
directory