Product : Red Hat, RHV/4.0, RHV
Feature : Virtual Disk Format, Storage, Network and Storage
Content Owner:  Roman Macek
Summary
Default max virtual disk size is 8TB (but its configurable in RHV DB)
Details
The default maximum supported virtual disk size is 8TB in RHV (but its configurable in RHV DB).
With virtio-scsi support, Red Hat also supports now 16384 logical units per target.

File level disk size remains unlimited by the hypervisor, the limits of the underlying filesystem do however apply.