Best practices for VHDX: Dynamic vs. Fixed size disks

Hello,

We are in the middle of a project where we roll out about 500T of disk space literally all across the globe, all virtualized on Hyper-V 2012 using DAS storage. As you all can imagine, using dynamically expanding .vhdx disks would be a huge time-saver during the rollout.

However, I could not find any clear statement from MSFT that dynamically expanding .vhdx files are OK or recommended for production environments. Can anyone point me to a reliable source which I can use in official project documentation (i.e. MSFT whitepapers, best practice documents or the likes)?

Thanks in advance,

Volker