The default/recommended block size for deduplicated storage policies is 128KB….except for storage policies “associated with cloud storage libraries,” where the recommended block size is 512KB.
Accordingly, we have storage policies where the primary copy on a local disk library is configured with a deduplication policy block size of 128KB and a secondary copy on cloud storage with a deduplication policy block size of 512KB.
But when I think about Aux copies, it seems to me that different block size will force all data to be transmitted, and new deduplication signatures generated for all data copied to the secondary cloud storage copy. Two different sized blocks will neve have the same deduplication signature. And so to be able to use DASH copies effectively, the primary and secondary copies must have deduplication policies with the same block size.
Does this make sense, or am I missing something?