Differences between controllers:

• ablk (sata)
• virtio-blk

These devices require no drivers in guest/VM to work. With virtio-blk, it uses slightly less CPU during IO (a feature of macOS virtio driver) so we are creating BigSur VMs with it by default. Unfortunately in Monterey, Apple decided to introduce APFS Volume locking on top of virtio-blk (this is how their Virtualization.framework work with disks) and we are unable to continue use virtio-blk since some cryptography, which we don’t emulate, is expected by Monterey kernel. Therefore, Monterey VMs are created with ablk.

It’s currently impossible to downsize a VM’s hard-drive. We suggest creating your initial VM Template with a smaller amount of available disk and then increase in subsequent Tags.

Post-modify, you need to tell disk utility to modify the VM’s disk to consume the new free space: anka run --no-volume {vmNameOrUUID} sudo diskutil apfs resizeContainer disk1 0