In order to read/write from/to Scale Computing HC3 block devices (aka Virtual SCRIBE Devices or VSD for short) the Libscribe component needs to be installed in KVM on each physical host. Libscribe is part of the QEMU process and presents virtual block devices to the VM. Because Libscribe is a QEMU block driver, SCRIBE is a supported device type and qemu-img commands work by default.
Although a virtIO driver doesnt need to be installed perse in each VM, it is highly recommended as I/O performance benefits greatly from it. IO submission takes place via the Linux Native Asynchronous I/O (AIO) that is present in KVM.
Shared storage devices in virtual Windows Clusters are supported.
QEMU = Quick Emulator
Scale Computing, HC3 [HCI]/8.5.3, x86
Hypervisor Interconnect, Virtualization, Workload Support