My config example    (Disclaimer: I need to see serial numbers in the DSM storage manager - so I found that only SATA bus can provide correct disk info for DSM, so I use scsi0 for Synology OS (vm-108-disk-1.raw) installing and bootloader via USB (vm-108-disk-0.raw), bcs QEMU support six SATA disks only. If you do not care about hard disk serial info - you can use SCSI bus for all, or SATA for all if you have less then six disks to use).    args: -device ich9-usb-ehci1,id=usb,