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connectivity. The next section describes these options.


If you are using iSCSI, ensure that a separate physical and virtual network is utilized for access to the iSCSI storage to obtain acceptable performance, including cabling and switching.

If you are utilizing iSCSI LUNs presented to the host, this means having dedicated physical NIC(s) for connectivity to the iSCSI storage.

Consider using Jumbo Frames on both the Guest‘s and Host‘s storage providing NICs for performance improvements.

If you are utilizing iSCSI LUNs directly presented to the guests, this means having dedicated Physical NIC(s) connected to the host, dedicated virtual switch (es) bound to the iSCSI physical NIC(s), and dedicated virtual NIC(s) in the guests bound to the iSCSI virtual switch. The end result would be a guest with two or more virtual NICs configured one for LAN connectivity and one or more for iSCSI connectivity.

Virtual Networks

You can create many virtual networks on the server running Hyper-V to provide a variety of communications channels. For example, you can create networks to provide the following:

  • Communications between virtual machines only. This type of virtual network is called a private network.

  • Communications between the Host server and virtual machines. This type of virtual network is called an internal network.

  • Communications between a virtual machine and a physical network by creating an association to a physical network adapter on the host server. This type of virtual network is called an external network.

You can use Virtual Network Manager to add, remove, and modify the virtual networks. Virtual Network Manager is available from Hyper-V Manager MMC. The network types are illustrated below.

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