Allows Hyper-V virtual disks as large as 64 TB and copes better than VHD with corruption caused by power cuts.
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Terms in this definition
- Hyper-V
The hypervisor built into Windows. The VMs for the Azure Extended Network appliance require the Hyper-V role, using nested virtualisation, and an external virtual switch for each NIC.
- VHD
A disk image format for virtual hard disks; the Azure Migrate appliance for Hyper-V, for instance, is downloaded as one.
Related terms
- Block cloning
VHDX merges and file copies on ReFS run fast because clusters are remapped rather than data being read then rewritten.
- Dynamically expanding disk
A VHD or VHDX that begins small and gets bigger as data is added, until it reaches its configured limit.
- Sparse VDL
A ReFS capability that zero-fills files almost immediately, so fixed-size VHDX files are created far more quickly.