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VSM migration from 32 to 64 bit aggregates with 8.1 then revert to 8.0.2

I am replacing a FAS6040A running 7.3.6 7-mode with a new FAS6240A.  The FAS6240A will become the produciton storage controller at the end of April.  Ideally, i'd like to use 8.1 7-mode on the new FAS6240A.  However, I may need to utilize 8.0.2/3 since 8.1 may not be GA in time for my cutover.  I want to use VSM to migrate directly to 8.1 and from 32 to 64 bit aggregates at the same time. 

My questions is: Can I do the migration with 8.1 in order to utilize VSM and then revert back to 8.0.2/3 afterward, retaining the 64 bit aggregates, of course?

Re: VSM migration from 32 to 64 bit aggregates with 8.1 then revert to 8.0.2

Are you replacing the filer head only or will FAS6240A be complete storage with shelves?

Re: VSM migration from 32 to 64 bit aggregates with 8.1 then revert to 8.0.2

The FAS6240A is a complete replacement including all new shelves.

Re: VSM migration from 32 to 64 bit aggregates with 8.1 then revert to 8.0.2

Reversion sucks since you have to delete ALL snapshots for ALL volumes prior to reversion. This is a requirement to revert / downgrade.

I just went through a similar process two weeks ago to convert a 32-bit aggregate to 64-bit to utilize SRM 5.0. Wasn't the most fun I'd ever had...but it worked. I get to do it again in April (before 8.1 GA but alas, I'm using 3210's for this and cannot leave 8.1 on there even if I wanted to since they have FlashCache).

But I assume you want to upgrade the 6240 to 8.1, correct? And then just use the new VSM feature to replicate as your migration strategy? I would hope the aggregate(s) for the 6240 are already at 64-bits, however, even before any data is put on there and regardless of ONTAP 8.0.2 vs 8.1.

What's the current replication / off-site strategy for the 6040?