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When you work with physical servers, there may be times where you have to add a network card, add or expand a hard drive, or move a network card cable from one switch to another. Virtual servers have the same needs, but you must perform these tasks virtually.

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MANAGING DISKS
When you create a virtual hard drive, you can define the virtual hard disks as:
• Fixed size virtual hard disks: Take up the full amount of disk space when created, even if there is no using parts of the hard disk.
• Dynamically expanding hard disks: Expands as it needs space up to its full space. One of the strengths of virtual servers is the ability to take snapshots. A snapshot is a point in time image of a virtual machine that you can return to. So, if you make a change to the system, such as loading a component or installing an update, that causes problems, you can use the snapshot to quickly revert back to the point before the change was made.

The snapshot files consist of:
• A copy of the VM configuration .xml file.
• Any saved state files.
• A differencing disk (.avhd) is the new working disk for all writes and is a child of the
working disk prior to the snapshot.
With Hyper-V, you can create 10 levels of snapshot per virtual server.
To create a snapshot in Hyper-V, select Snapshot from the Action menu or panel or by clicking
on the snapshot button in the toolbar. When you create a snapshot, a dialog box will appear that allows you to enter a name for the snapshot. You can dismiss this dialog and have the snapshot use an auto-generated name if you prefer. This auto-generated name will consist of the name of the virtual machine followed by the date and time when the snapshot was taken.

MANAGING VIRTUAL NETWORKS AND NETWORK CARDS
Virtual networks consist of one or more virtual machines configured to access local or external network resources. The virtual network is configured to use a network adapter in the physical computer.
If a network adapter in the physical computer is selected, then any virtual machines attached
to the virtual network can access the networks to which that physical adapter is connected.
If the virtual network is configured not to use a network adapter, then any virtual machine
attached to the virtual network becomes part of the internal virtual machine network.
An internal virtual machine network consists of all virtual machines attached to a virtual network that is configured to use a network adapter. Each internal virtual machine network is
completely isolated from all other internal virtual machine networks.

ADD A VIRTUAL NETWORK
To add a virtual network:
1. Open Hyper-V Manager.
2. From the Actions menu, click Virtual Network Manager. See Figure 7-8.

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Figure 7-8 Virtual Network Manager

3. Under Create virtual network, select the type of network you want to create.
4. Click Add. The New Virtual Network page appears.
5. Type a name for the new network. Review the other properties and modify them if necessary.
6. Click OK to save the virtual network and close Virtual Network Manager, or click Apply to save the virtual network and continue using Virtual Network Manager.

MODIFY A VIRTUAL NETWORK
To modify a virtual network:
1. Open Hyper-V Manager.
2. From the Actions menu, click Virtual Network Manager.
3. Under Virtual Networks, click the name of the network you want to modify.
4. Under Virtual Network Properties, edit the appropriate properties to modify the virtual
network.
5. Click OK to save the changes and close Virtual Network Manager, or click Apply to
save the changes and continue using Virtual Network Manager.

REMOVE A VIRTUAL NETWORK
To remove a virtual network:
1. Open Hyper-V Manager.
2. From the Actions menu, click Virtual Network Manager.
3. Under Virtual Networks, click the name of the network you want to remove.
4. Under Virtual Network Properties, click Remove.
5. Click OK to save the changes and close Virtual Network Manager, or click Apply to save the changes and continue using Virtual Network Manager.

ADD A NETWORK ADAPTER
GET READY. To add a network adapter:
1. Open Hyper-V Manager. Click Start, point to Administrative Tools, and click Hyper-V Manager.
2. In the results pane under Virtual Machines, select the virtual machine that you want to configure.
3. In the Action pane under the virtual machine name, click Settings.
4. In the navigation pane, click Add Hardware.
5. On the Add Hardware page, choose a network adapter or a legacy network adapter.
6. Click Add. The Network Adapter or Legacy Network Adapter page appears.
7. Under Network, select the virtual network you want to connect to.
8. If you want to configure a static MAC address or virtual LAN identifier, specify the numbers you want to use.
9. Click OK.