1.                                 
    
Practical Examples
Synchronisation Pitfalls
Keith Merrington
APP01

2. Synchronisation - definition
To cause two files at different locations to match exactly
To cause two directories contents at different locations to match exactly

3. Synchronisation – what, what not
Copying only files that have changed by replacing older files with newer files
Don’t copy files that are identical
Removing files that have been deleted

4. Possible pitfall – modification date
Newer is relative and based on the last modification date and time stamp of a file. If files are on different computers then “newer” may not always be true
Solution. Make sure that all computers clock’s are synchronized via Internet or the local server.

5. Synchronisation – what, what not
Don’t copy files that are identical
How to determine
Modification Date
or MD5
Minimize network traffic, optimize performance
By saving MD5 with file as an EA and only generate when necessary

6. Synchronisation – what, what not
Remove files that have been deleted
How to determine
Keep list of files present at last sync
At both locations!

7. What if something goes wrong
If a file is overwritten that should not have been overwritten.
If a file is deleted that should not have been deleted .
Solution
Save each file before it is overwritten or deleted

8. What if something goes wrong
Make sure that the file that is deleted/overwritten is available at the original location and can be restored locally.
Solution
Use a special location to do this.
The VAULT

9. Synchronisation
Is true synchronization what we really want. or
What don’t we want synchronized or should not be synchronized

10. What shouldn’t be synchronized
Command or batch files which refer to different locations
Ini files which contain global information which is specific to their location
Solution
Remove files from synchronization

11. Use a graphical interface
Make things visible
Solution
Use a graphical interface
Allow interactive synchronization to check whats happening
Provide visible indication of what will be synchronized.

12. EasySync Program
Provides synchronization between two locations with a graphical interface.
Number of files limited only by available memory
Allows either interactive or batch operation
Supports NetDrive™ for OS/2
Provides logging of all actions
Provides multi-level recovery of files
Support for both individual script files and script file lists
Multi-lingual support (Danish, Dutch, English, French,German,Italian,Spanish andSwedish,
WPI installation

13. EasySync - Demo
Router
(dhcp server)
eCS 2.0
Windows

14. EasySync now during Warpstock 2011
on CD
only €25

15.                                 
    
Practical Examples
Thank you