it is possible to attach disk to running KVM machine.
# Add SCSI drive: qm set 107 -scsi3 /dev/disk/by-id/ata-ADATA_SU800_2I0120040332 # Add single partition to SCSI controller: qm set 107 -scsi3 /dev/disk/by-id/ata-ADATA_SU800_2I0120040332-part3 # Remove drive: qm unlink 107 --idlist scsi3
Machine reboot is required (not system restart) for new SATA device (there wasn't SATA controller before)
# Add SATA drive: qm set 107 -sata0 /dev/disk/by-id/ata-ADATA_SU800_2I0120040332 # Remove drive: qm unlink 107 --idlist sata0