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⟦df34a0013⟧ Wang Wps File
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Types: Wang Wps File
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Names: »~ORPHAN73.08«
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└─⟦17da89677⟧ Bits:30006229 8" Wang WCS floppy, CR 0126A
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WangText
T̲A̲B̲L̲E̲ ̲O̲F̲ ̲C̲O̲N̲T̲E̲N̲T̲S̲
4.2.8 System Initializaton .................
4.2.8.1 Initialization Procedure ..........
4.2.8.2 Local System Data Base (LSDB) ......
4.2.8.3 Storage of the S/W and Data Required
for Initialization .................
4.2.9 Storae of the System Program and
Current Data Base ......................
4.2.10 Recovery ..............................
4.2.10.1 Information Integrity .............
4.2.10.2 Scope of Recovery Procedure .......
4.2.10.3 Recovery Points ...................
4.2.10.4 Recovery Program ................
4.2.10.6 Continuity of Message Traffic
after Failure ....................
4.2.10.7 Continuity of Stored Message
Information ......................
4.2.10.8 Continuity of the reporting
System ...........................
4.2.10.9 Continuity of System Data. ........
4.2.10.10 Resumption of local transaction
aftr failure ...................
…86…1 …02… …02… …02… …02…
4.2.8 S̲y̲s̲t̲e̲m̲ ̲I̲n̲i̲t̲i̲a̲l̲i̲z̲a̲t̲i̲o̲n̲
4.2.8.1 I̲n̲i̲t̲i̲a̲l̲i̲z̲a̲t̲i̲o̲n̲ ̲P̲r̲o̲c̲e̲d̲u̲r̲e̲
Initialization is the process of bringing the system
into operational use without recovery.
Three types of iitialization may be used:
D̲E̲A̲D̲1̲:̲ For the very first start of the system
from an offline disk with the initial system
parameters.
D̲E̲A̲D̲2̲:̲ From an offline disk containing updated system
parameters reflecting the state of tables
at the time f the latest OFF-LOAD (ref. IFB
sec. 5.1.2.8.4).
This type start-up makes use of mirrored, on-line
disks that are preformatted (cleared) prior to
the initialization process.
C̲O̲L̲D̲:̲ From one of the mirrored on-line disks.
This is based on he current system parameters
and includes the proper purging of the historical
data base.
Once a DEAD-start has been performed, the MPF site
software package will be available on the mirrored
on-line disks for future COLD-starts or recovery
situtions.
The data held on-line will initially be from the
appropriate off-line MPF site software package.
As described under "DEAD" and "COLD", the system
will be initialized with an empty, historical data
base.
As for the MPF site software package, the LSDB
will be established as well.
The maximum duration of initialization from an
off-line disk will not exceed 5 minutes.
The initalization Procedure will progress as follows:
Having switched on the power, the supervisor must
make sure that the proper disks are physically
mounted, i.e.:
- on the "off-line drive" should be mounted the
original system-parameter-disk or a isk containing
an off-loaded version for DEAD1 and DEAD2,
respectively.
- on the mirrored on-line drives should be mounted
a set of cleared and preformatted disks or
just the currently used on-line disks for DEAD
or COLD, respectively.
He the presses the "start" button on the disk drives
where a disk is mounted, and he presses the "reset"
button on the watchdog processor and on the Processing
Units. Thereafter he can interactively choose
the appropriate start-up type from the watchdogconsole
(Engineering Position). When initialization is
finished he will be notified.
4.2.8.2 L̲o̲c̲a̲l̲ ̲S̲y̲s̲t̲e̲m̲ ̲D̲a̲t̲a̲ ̲B̲a̲s̲e̲ ̲(̲L̲S̲D̲B̲)̲
The LSDB contains the appropriate values of system
parameters and address and routing information and
is administered y the "Table Management Package".
4.2.8.3 S̲t̲o̲r̲a̲g̲e̲ ̲o̲f̲ ̲t̲h̲e̲ ̲S̲/̲W̲ ̲a̲n̲d̲ ̲D̲a̲t̲a̲ ̲R̲e̲q̲u̲i̲r̲e̲d̲ ̲f̲o̲r̲ ̲I̲n̲i̲t̲i̲a̲l̲i̲z̲a̲t̲o̲n̲
The means and the mediums used for the standard procedures
have been described above, i.e. a procedure where the
sftware resides on the off-line disc drive.
New software versions or data may be loaded/stored
from floppy disk. The storage arrangements employ
the use of various checks e.g. Cyclic Redundancy Check
to detect corruption of data.
Once loaded, te data is available on-line.
4.2.8.4 S̲t̲o̲r̲a̲g̲e̲ ̲o̲f̲ ̲t̲h̲e̲ ̲S̲y̲s̲t̲e̲m̲ ̲P̲r̲o̲g̲r̲a̲m̲m̲e̲ ̲a̲n̲d̲ ̲C̲u̲r̲r̲e̲n̲t̲ ̲D̲a̲t̲a̲ ̲B̲a̲s̲e̲.̲
It will be possible to "OFF-LOAD" these data as required.
This can be performed periodically, but we recommend
that the supervisor be notified perioically and that
the off-load command will then be issued by a deliberate
action.
4.2.9 R̲e̲c̲o̲v̲e̲r̲y̲
Extensive use of checkpointing to the two mirrored
disks is employed.
The processing flow of the message processing system
consists of a well deined set of successive steps where
output for one step serves as input for one or more
succeeding steps.
