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Why does snapmirror compression require multiple connections?

My customer attempted to run snapmirror compression between 7.3.2 systems and after some digging we discovered the compressions didn't work due to the lack of mulitple connections as outlined in this KB:  https://now.netapp.com/Knowledgebase/solutionarea.asp?id=kb56448

Customer is asking why compression needs two connections and I could not find a clear answer.  What parts of the compression process require two connections, and how is it possible to still have a functioning snapmirror relationship (without compression) with only one connection?

Re: Why does snapmirror compression require multiple connections?

It requires that you set up a named connection.  That "multi" connection can be a single set of IPs (i.e. you can have a multi connection with only 1 pair).

It's confusing I know, but you are not required to have multiple pairs.

Hope this helps.