It's definitely a supported function as I've installed quite a few in that mode. Normally I create the Aggregate and move root first, then enable the hybrid option, not the other way around. Do you have any other mutually exclusive options (such as SnapLock) on the root volume already?
Just tried it and a hybrid aggregate does indeed block the activation of the root flag on a volume.
If you need to do this you would need to move the root volume BEFORE setting the aggregate into hybrid mode (and ensure you are on 8.1.2+)
Create destination aggregate
Move root and restart
Confirm root is in the correct place
aggr options <aggr> hybrid_enabled on -f
aggr add <aggr> -t SSD <n>
Obviously this is a little late if you've already gone through most of the migration so it might be worth logging a call with NetApp support as it may be a bug (since 8.1.1 blocked shared root / hybrid completely and the command may not have been updated in the code)
Yes I've also installed some new systems in that mode as well. So in 8.1 I indeed should have planned things in a different order. Already moved 50+ data volumes (8+ TB)... No fun to do that again (twice)...
However, meanwhile I was told of bug 621647 - according to that a "move of the root vol onto exisiting flash pool aggr" should work from 8.2 onwards... Can anyone confirm this?
I cannot give it a try (upgrade to 8.2) at the moment because of many SnapDrive/SnapManager dependencies...
I checked this with 8.2 but this is still not possible to move the rool volume to a flash-pool aggregate. With System Manager 3.2 as well, it is not possible to change the existing aggregate with the root volume to use disks from the SSD Pool.
There is a solution, to use Flash-Pool with a root volume and not loosing expensive hard disks for a new root aggregate.
Create a new aggregate, move the root volume on this aggregate, change to hybrid, add SSD disks.
As far as I know, this is only possible in this order using the commandline.
Good idea to take advantage of the increased max. aggregat sizes in Ontap 8.2 at the same time.