Hi Team,
Customer has asked me about Azure Stack HCI backup recommended volume size. He sent me a link to MS docs
![](https://uploads-eu-west-1.insided.com/commvault-eu/attachment/5a3c79ba-ce18-4874-a35e-ac85ef6cb8eb.png)
https://learn.microsoft.com/en-us/azure-stack/hci/concepts/plan-volumes
Customer is concerned about planning for volume sizes of VMs i.e. 2x10TB vs 1x20TB vm disk.
So the question that remains is: does Commvault use Hyper-V RCT API and/or ReFS block cloning?
Can I advice customer to go over 10TB vm disk without hurting performance?