top - download
⟦b41a044f5⟧ Wang Wps File
Length: 5476 (0x1564)
Types: Wang Wps File
Notes: PROP F DEV. SYSTEM
Names: »3905A «
Derivation
└─⟦2939611b6⟧ Bits:30006177 8" Wang WCS floppy, CR 0350A
└─ ⟦this⟧ »3905A «
WangText
…02… 3905A/jaa
…02… AG/830805…02……02…#
PROPOSAL FOR DEVELOPMENT SYSTEM
…02……02…CAMPS
T̲A̲B̲L̲E̲ ̲O̲F̲ ̲C̲O̲N̲T̲E̲N̲T̲S̲
1 DEVELOPMENT SYSTEM - WHAT IS RATIONAL .....
FOR CONFIGURATION? ........................
2 WHY CAN'T THE DEVELOPMENT SYSTEM BE .......
COMBINED WITH AN OPERATIONAL SITE? ........
3 WHY NOT COMBINE DEVELOPMENT & TDS SYSTEMS?.
4 WHY NOT COMBINE DEVELOPMENT/REF.SYST ......
5 WHY CAN'T THE REF.SYSTEM DRIVE ITSELF? ....
1 D̲E̲V̲E̲L̲O̲P̲M̲E̲N̲T̲ ̲S̲Y̲S̲T̲E̲M̲ ̲-̲ ̲W̲H̲A̲T̲ ̲I̲S̲ ̲R̲A̲T̲I̲O̲N̲A̲L̲ ̲F̲O̲R̲ ̲C̲O̲N̲F̲I̲G̲U̲R̲A̲T̲I̲O̲N̲?̲
.5 VDUs - a number of people may work
in parallel on different problems.
.2 DISCS 2 x SMDs for copying purposes
disc/disc for config. management
+ preparation for issue.
.2xFloppy discs - For preparation and incorporation
of small changes.
- For programmer files prior to
passing to librarian (configuration
control).
- For incorporation into library
files by librarian.
. Line Printer - For fast output of listings
and test results.
- Shared between users to save
costs.
. Tape Unit - For archive purposes
- For capture of NICS-TARE routing
data base or other IBM compatable
data.
. KEY/PRINTER
CONSOLE - To record error codes & results.
Reasons for failure
2 W̲H̲Y̲ ̲C̲A̲N̲'̲T̲ ̲T̲H̲E̲ ̲D̲E̲V̲E̲L̲O̲P̲M̲E̲N̲T̲ ̲S̲Y̲S̲T̲E̲M̲ ̲B̲E̲ ̲C̲O̲M̲B̲I̲N̲E̲D̲
̲W̲I̲T̲H̲ ̲A̲N̲ ̲O̲P̲E̲R̲A̲T̲I̲O̲N̲A̲L̲ ̲S̲I̲T̲E̲?̲
I̲M̲P̲A̲C̲T̲ ̲O̲N̲ ̲O̲P̲N̲L̲ ̲S̲I̲T̲E̲ ̲O̲F̲ ̲L̲I̲M̲I̲T̲E̲D̲ ̲D̲E̲V̲E̲L̲ ̲C̲A̲P̲.̲
a. A̲v̲a̲i̲l̲a̲b̲i̲l̲i̲t̲y̲
. No automatic switchover to the redundant
hardware is possible. Must be manual. This
could cause loss of the jobs in progress
on the on-line and off-line side with possible
disc/data corruption.
Hence loss two ways
. Start-up from SMD is impossible unless
system disk is manually loaded.
. Hardware has to be reconfigured so that
devices assigned to on and off-line revert
to original configuration.
b. F̲a̲c̲i̲l̲i̲t̲i̲e̲s̲
. Retrieval becomes impossible if off-line
disc is in use.
Problems are because of shared disks and use of
redundant equipment provided for availability
purposes. Availability depends critically on the
switchover time to redundant equipment which must
be as short as possible. It involve minutes for
manual operation whereas automatic switchover
normally takes place in seconds.
c. S̲W̲
OFF LINE SW IS: completely different from on-line.
I̲M̲P̲A̲C̲T̲ ̲O̲N̲ ̲D̲E̲V̲E̲L̲O̲P̲M̲E̲N̲T̲ ̲S̲Y̲S̲T̲E̲M̲ ̲O̲F̲ ̲C̲O̲M̲B̲I̲N̲A̲T̲I̲O̲N̲ ̲W̲I̲T̲H̲ ̲O̲P̲N̲L̲
̲S̲Y̲S̲T̲E̲M̲
a. D̲i̲s̲c̲ ̲U̲s̲e̲
. No disc/disc copy is possible since another
SMD not available.
. MMD not available due to mirrored disc
arrangement in CAMPS.
b. P̲r̲i̲n̲t̲e̲r̲
. No fast printer with paralled interface
available.
c. T̲a̲p̲e̲ ̲U̲n̲i̲t̲
. No tape unit available.
S̲U̲M̲M̲A̲R̲Y̲ - HW required is different
- SW used is different
- Combination reduces capability of
both systems. Availability and facilities
of OPNL System down. Necessary features
of Development System impossible.
3 W̲H̲Y̲ ̲N̲O̲T̲ ̲C̲O̲M̲B̲I̲N̲E̲ ̲D̲E̲V̲E̲L̲O̲P̲M̲E̲N̲T̲ ̲&̲ ̲T̲D̲S̲ ̲S̲Y̲S̲T̲E̲M̲
E̲f̲f̲i̲c̲i̲e̲n̲c̲y̲
. Cannot be used concurrently for both tasks.
. Software packages are completely different and
assume different hardware configuration.
. HW Configuration would have to be switched one
to another with possible degradation. HW required
is different.
. Development System & TDS will be heavily used
and TDS will be left running for long periods
- perhaps days/weeks testing the software.
e.g. recalcitrant faults
or regression tests
Remember that the system underwent about 100 days
of test prior to first release. To re-release
a certified system will need extensive test time.
The TDS will just n̲o̲t̲ be available for other purposes.
4 W̲H̲Y̲ ̲N̲O̲T̲ ̲C̲O̲M̲B̲I̲N̲E̲ ̲D̲E̲V̲E̲L̲O̲P̲M̲E̲N̲T̲/̲R̲E̲F̲ ̲S̲Y̲S̲T̲
. Ceases to be a reference system if split in two
for this purpose.
. Does not have all hardware required for all functions
(ADDING IT IS COUNTER TO REF.SYSTEM)
. In some cases the failures invoked will be due
to dualised nature of system - such faults cannot
be investigated if system is split. (COUNTER TO
PURPOSE OF REF.SYSTEM)
. Impossibility of use of MMD's as configured for
on line/off line work.
. Software for development & operations are completely
different.
. Ref.Systems will be almost always up & running
tests.
. Interference with ref. system connectivity (VDUs
etc)
I̲n̲ ̲s̲u̲m̲ - HW required is different
- To add HW to ref. system makes it
a non reference system.
5 W̲H̲Y̲ ̲C̲A̲N̲'̲T̲ ̲T̲H̲E̲ ̲R̲E̲F̲E̲R̲E̲N̲C̲E̲ ̲S̲Y̲S̲T̲E̲M̲ ̲D̲R̲I̲V̲E̲ ̲I̲T̲S̲E̲L̲F̲?̲
a. Splitting reference system and putting different
SW on standby makes it a n̲o̲n̲ r̲e̲f̲e̲r̲e̲n̲c̲e̲ system.
b. Failures having to do with SW over start-up cannot
be found.
c. Number of ports on Reference System would have
to be increased.
d. SW is completely different from operational SW.
e. Off line features of Operational SW impossible
e.g. retrieval.
H̲e̲n̲c̲e̲: - HW required is different
SW is different
Impossible to use it as a reference
system.
Degradation of facilities.
Inconvenient.
