MSDP Global Dedup ?

MSDP are islands of dedupe.  Thus, the 52xx and 53xx range of NetBackup Appliances are each islands of dedupe.   But they are "global" in the sense that any backup sent to an MSDP storage unit is a candidate for dedupe by that island of MSDP no matter what the source.

The term global dedupe is sometimes misused these days.  There used to be a range of appliances, the 50x0 NetBackup Deduplication Appliance range which could be configured for global dedupe, but these have been discontinued.  These 50x0 Appliances were also sometimes referred to as PDDO Appliances.

It sounds to me as if you have caused a change in target - and so perhaps you have multiple MSDP storage units, and you have now caused the backups to be written to another different MSDP storage unit.

Those of us with multiple MSDP storage units will usually be quite careful in our configuration of storage unit groups - so that backups always go to a specific MSDP storage unit, but so that we can also quickly cause multiple backups to go to a different storage unit, if the need should arise, without having to change multiple backup policies or multiple schedule or even  multiple SLPs - but we are always mindful of perhaps your experience and do our best to minimise what has hapenned in your case.

Questions:

I assume your have only NetBackup Appliances?  Or do you have other vendor deduplication devices instead, or as well as?

What model are your Symantec/Veritas applliances?  50xx or 52xx or 53xx ?

How many MSDP storage units do you have?