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4 Data Management User Manu al Line Computer UNIX 4.2 Data Storage Software Version 501.xx 01/99 Issue 4 - 6 4.2.1.1 Switching Between Central and Local Data Storage Switchin g between central and loc al data stor age is…

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User Manual Line Computer UNIX 4 Data Management
Software Version 501.xx 01/99 Issue 4.2 Data Storage
4 - 5
4.2 Data Storage
4.2.1 General Description
The computer system of a production line may consist of several line computers and one central computer.
Every individual line computer has its own
local data storage
. The central computer is used for
central data
storage
. All line computers within the computer system can access this central data storage, provided, however,
that
- the network connections (NFS) from the local computers to the central computer already exist,
- the software versions use the exactly identical data format,
- the file and directory structures of the local computers correspond to that of the central computer.
This can be accomplished, for example, by copying the existing line computer data storage to the
central computer.
NOTE
When working with the central data storage, any changes made to the data are only
rewritten to the
central
data storage
, i.e. the
local data storage
is not updated.
However, in order to keep the local data storage up-to-date, it is therefore necessary that these data be regu-
larly (e.g. at the end of every working day) overwritten with the data from the central data storage. In the event
of a power failure, work can thus be continued using the updated data contained in local data storage.
Inside the Line selection button (see chapt. 3, Fig. 3.1.1), on the desktop, the currently active data storage mode
is indicated in front of the designation of the current line:
e.g. local: /Anlagen/xxx.ak) for local data storage
central: /Anlagen/xxx.ak) for central data storage.
4 Data Management User Manual Line Computer UNIX
4.2 Data Storage Software Version 501.xx 01/99 Issue
4 - 6
4.2.1.1 Switching Between Central and Local Data Storage
Switching between central and local data storage is effected via the "SERVICES" menu using the "Data storage"
menu option.
For the switch-over operation to be successful, the following points must be observed:
- No more jobs must be scheduled.
- No compiler or producibility check runs must be in progress.
NOTES
Following the switch-over operation the computers need not be re-booted.
If data are changed or entered in editors that may be open, these data will be stored to the newly selected
data storage upon saving.
It is possible to download data from the host computer to the local or central data storage at any time. This
takes place without any interruption of the ongoing production process.
Switching from central to local data storage:
● On the SERVICES desktop menu click on the Data storage menu option.
The "Data storage" window is opened.
● Click on the Local data access button.
The button is now highlighted in gray.
● Click on OK.
The following window is opened.
● If all conditions listed in the dialog box are met, click on the OK button.
User Manual Line Computer UNIX 4 Data Management
Software Version 501.xx 01/99 Issue 4.2 Data Storage
4 - 7
The switch-over procedure is started and subsequently verified.
When the switch-over procedure has been successfully completed, the following message is dis-
played on the screen:
● Confirm the message with OK. The data are now saved to the local data storage.
If the switch-over procedure could not be performed, a corresponding error message is displayed.
Switching from local to central data storage:
NOTE
Prerequisite for the switch-over operation is the existence of a central data storage.
If the latter does not exist yet, it will not be set up.
● Click on the Data storage menu option on the SERVICES menu on the desktop.
The "Data storage" window is opened..
● Click on the Central data access button.
● Click on the entry field and enter the pathname of the central data storage.
NOTE
Below the path of the central data storage the "Master data" and "Job data" directories must be
located (e.g. /nfs/zentral_dat/zentral_sdh/Master data; ..../zentral_sdh/Job data).
● Click on OK.
The dialog box containing a listing of the prerequisites to be fulfilled for the switch-over operation
is opened.
● If all conditions are met, click on the OK button.
The switch-over procedure is started and subsequently verified. If it is not possible to access the
central data storage, the following error message is displayed.
entry field