I haven't done it myself yet, but I've been doing some research.
The first question is how are you planning on doing this? Is your environment Vmware, the very simple solution would be to create new datastores with TDVV3 (maybe hit two birds with one stone and get VMFS6 on those datastores as well if you're thinking vSphere 6.5). Then storage vMotion VMs to the new datastores and delete the old ones.
If you are planning on using DO, I've been recommended is not to go from TDVV2 directly to TDVV3, but to go TDVV2 -> TPVV -> TDVV3. I don't know if that recommendation is still in play, but be worth checking with HPE. When using DO (at least thin -> thin) you need to have enough free space to match the size of the TPVV. So if your volumes are 2x8TB, you would always need 8TB of free capacity to initiate the DO/tune even though you don't need all that space.
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