chaining replication to setup a delta backup scheme

["james liang" <blueyonder@excite.com>]

Hi,

Is it possible to have openldap replicate in the following manner?
diagram 1:
A -> B -> C

The reason for this configuration is that I am thinking about building a system with a hot standby and an online delta backup by leveraging openldap's replication capability.

The way this works is this.
A will constantly replicate to B.  If A goes down B will take it's place.

B will have replication turn on but slurpd TURN OFF.  This way, the replication log will grow throughout the day.  

At mid night, a cron job will copy the replication log from B to C and name it with today's date.  In addition, the cron job will also apply the replication log from N days ago to the slapd running on C.  In other words, the slapd on C is N days behind and there are N number of replication log file.  Each replication log file contains the change delta of one day.

In the above system:
A - primary
B - standby
C - N day delta backup

-thanks
James



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