drmach: Device busy: ndi_devi_offline(device, flags)Description
A call to ndi_devi_alloc returned a device busy error for the specified device. The device is still in use by the system.Recovery
Use fuser(1M), or similar software on the domain, and showdevices(1M) on the system controller to determine how the resource is in use. Remove the usage, then retry the DR operation.