Information Technology Reference
In-Depth Information
This is also the case when you create an external virtual network because it will replace
the physical network card of the host machine to give the parent partition a virtual network
card that is also used in the child partitions.
Unlike with Virtual Server 2005, Hyper-V binds the virtual network service to a
physical network adapter only when an external virtual network is created. The benefit of
this is that the performance is better if you do not use the external virtual network option.
The downside, however, is that there will be a network disruption when you create or
delete an external virtual network.
Communication between the virtual machine and the local host computer
is not configured automatically. Once you install a virtual machine, you
need to make sure that the TCP/IP settings are in agreement with the
settings you define in the virtual network card. Start with a ping from your
host machine to the virtual machines to verify that communication
is working.
Managing Virtual Hard Disks
In addition to virtual networks, you need to manage virtual hard disks that you attach to
your virtual machines. A virtual hard disk in Hyper-V, apart from a pass-through disk, is a
VHD or VHDX file that basically simulates a hard drive on your virtual machine.
The following sections will first show you what types of virtual hard disks are available
and then show you how to create them. You will also learn about what options are
available to manage virtual hard disks.
Types of Hard Disks
Depending on how you want to use the disk, Hyper-V offers various types, as described in
Table 9.4.
Table 9.4
Virtual hard disks in Hyper-V
Type of disk
Description
When to use it
Dynamically
expanding
This disk starts with a small VHD file and
expands it on demand once an installation
takes place. It can grow to the maximum
size you defined during creation. You can
use this type of disk to clone a local hard
drive during creation.
This option is effective when
you don't know the exact
space needed on the disk and
when you want to preserve
hard disk space on the host
machine. Unfortunately, it is
the slowest disk type.
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