Synology SA3400 Virtual Machine Manager s White Paper - Page 17

local network, either via DHCP or manual configuration. If connected to a private vSwitch, they are (also) assigned a local IP address on the host network. Creating a Virtual DSM instance allows you to manually configure an IP address. However, VMM can only detect guest IP addresses on other operating systems if the QEMU agent is installed and running. Virtual network interfaces VMs connect to the network with virtual network interfaces. Four types of interface are supported in VMM: e1000, rtl8139, VirtIO, and SR-IOV. The first two standards offer the widest compatibility. VirtIO supports faster connections and is recommended, but requires separate installation on Microsoft Windows VMs using the Synology Guest Tool. SR-IOV (Single Root I/O Virtualization) is a high-performance interface that can drive down I/ O latency and CPU use, but requires hardware with built-in support. It allows several VMs to share PCI hardware resources and performs almost as well as a physical network card, but does not support VM suspension, live migration, and VMM High Availability. Network bonding Link Aggregation, also called network bonding, is a recommended function that raises expected cluster availability. Each host combines at least two active LAN interfaces into a single Bond network interface. The LAN ports in a Bond connect to the same network and provide fault tolerance in addition to more bandwidth. Even without bonding, users can add several LAN ports to each vSwitch to increase redundancy. In that case, VMM will automatically choose between ports to achieve load balancing and switch over to an alternate port in case of network failure. 5. Share Links and External Access Virtual machines running on Virtual Machine Manager can be accessed remotely in four ways: through the VMM interface on your Synology NAS, with easy-to-use share links, through remote desktop software, and using the command line over Secure Shell (SSH). Access via Synology VMM As long as your Synology NAS is online, you can power on, power off, and access any virtual machine running on it directly in VMM in your browser. You can also enable direct access to a machine in any browser by creating one or more VMM share links. Both methods work regardless of whether VMs are connected to the internet. Remote access protocols VMs that are connected to the internet and have their own IP address can also be accessed using conventional remote access protocols. Remote Desktop Protocol (RDP) and Virtual Network Computing (VNC) client applications let you operate your virtual machine's desktop graphically. With SSH, you can control active machines using the command line. All of these solutions let you control VMs that are online and running. However, only Virtual Machine Manager and VMM share links provide access to machines without network 15 Configuration Guide