DRP in OST with EMC DDBoost - Transfer backup load to 2nd appliance

People, Hi ! This is NetBackup 7.1

Let's say I have 2 Sites, each with 1 DataDomain Appliance, 1 Media Server with DDBoost, and clients on both sites. Pipe between the 2 sites is good enough for bi-directional replication. I need by default 2 SLP as I have 2 sites A and B : one for A-Clients, one for B-Clients

I know how to use SLP to define Primary copy (backup) locally, and Duplication to 2nd remote appliance, using optimized duplication (with replication between DD appliances).

SLP-A : MediaServer-A --> DD-A -->DD-B
SLP-B : MediaServer-B --> DD-B --> DD-A

Question In case of an appliance failure, what is the best way to provide continuity in the backup activity, ?

1st possibility : 2 more SLPs are just waiting to be used as destination within Backup policies :
FO-SLP-A : MediaServerA --> DD-B --> DD-A
FO-SLP-B : MediaServerB --> DD-A --> DD-B

So when DD-A fails, I send all my backup to DD-B, and when DD-A is back I do have my replication ready to be done back from B to A.

This requires a script to modify Backup policies and use another SLP than the basic one. This must be launched manually.

 

2nd possibility : The SLPs are defined to use 2 Backup destinations, one Media Server using both DD-A and DD-B, and no duplication.
I think in that situation that when one backup destination is not available, the backup job fails, and there is no duplication done later when the failed appliance is back, right ?

 

3rd possibility : Changing the SLP by a script when an appliance fails.
This is the worst solution ! You are not supposed to edit the destination on a running/active SLP !

 

4th possibility
What do you suggest/propose ?
This is NetBackup 7.1 .... is there a Failover possibility in 7.5 for the backup destination in SLP

Thank you all :)