Distribution Service and Distribution Steps
The data are copied when distributing by using an independent Distribution Service. The Distribution Service copies the data in steps to the lower-level master depot and then to the local depots - cascaded distribution.
The Distribution Service first builds a list of targets. In each distribution step, it checks using specific files if there are new or changed data in the source. If yes, it reads all the data of the source, compares them with the version in the target, and writes the changed data to the target.
The source for a target is always the next highest logical object of the site structure.
- Let us assume the following
site structure with two locations:
In this site structure, there are the following logical distribution targets:
- Subsidiary1
- HH
- SV02 (local depot)
- Headquarters
- ES
- SV01 (local depot)
The master depot assignment in the site structure is as follows:
|
Object |
Master Depot |
|---|---|
|
Enterprise |
SV01 |
|
Subsidiary1.Enterprise |
SV02 |
|
HH.Subsidiary1.Enterprise |
SV02 |
|
Headquarters.Enterprise |
SV01 |
|
ES.Headquarters.Enterprise |
SV01 |
The following table shows the logical sources for each distribution target (indicate with the full context):
|
Serial No. |
Logical target |
Logical source |
|---|---|---|
|
1 |
Subsidiary1.Enterprise |
Enterprise |
|
2 |
HH.Subsidiary1.Enterprise |
Subsidiary1.Enterprise |
|
3 |
SV02.HH.Subsidiary1.Enterprise |
HH.Subsidiary1.Enterprise |
|
4 |
Headquarters.Enterprise |
Enterprise |
|
5 |
ES.Headquarters.Enterprise |
Headquarters.Enterprise |
|
6 |
SV01.ES.Headquarters.Enterprise |
ES.Headquarters.Enterprise |
There are therefore six logical distribution steps in this site structure.
Since the master depots are identical for some of the objects, there are only actually three physical distribution steps as shown in the following table:
|
Serial No. |
Physical target |
Physical source |
|---|---|---|
|
1 |
SV02 (Work directory) |
SV01 (Work directory) |
|
2 |
SV02 (Work directory) |
SV02 (Work directory) |
|
3 |
SV02 (Install directory) |
SV02 (Work directory) |
|
4 |
SV01 (Work directory) |
SV01 (Work directory) |
|
5 |
SV01 (Work directory) |
SV01 (Work directory) |
|
6 |
SV01 (Install directory) |
SV01 (Work directory) |
The source and target are identical in steps 2, 4 and 5. The "real" steps 1, 3 and 6 remain. Data are transferred between the sites and hence via a WAN path only in step 1.