PolyServe Understudy 1.3

3. Adding and Deleting Cluster Servers

3.1 Adding a Server to the Cluster

To add a cluster server, choose the Add Server option from the Cluster menu. At the dialog box, enter the name or IP address of the server you wish to add to the cluster.
Note:
The current version of Understudy does not allow having more than two servers in a cluster.

Note:
All servers participating in the same cluster need to be on the same Ethernet segment.

Note:
There is no need to add the server to which the GUI is connected.

Note:
In order to use Understudy to protect a web site, an instance of a web server needs to run on each of the corresponding cluster server computers, and the contents of the web site needs to be replicated on both servers, or be located on a separate file system which is accessible from both servers.

Hint:
It is recommended that you only add servers running the understudy software. (See the manual for more details.)

Hint:
In order to ensure maximum availability, it is recommended that each server have its own electric power supply.

3.2 Deleting a Server from the Cluster

To Delete a server, you need to first select it by pointing the mouse on its icon and then clicking on the left mouse button. Once the server is selected, choose the Delete Selected Server option from the Cluster menu. Understudy will then prompt an authorization dialog box. Click OK to accept, or Cancel to cancel the operation.
Note:
You cannot delete the server to which you are connected from the Understudy console. If you wish to delete that server, then simply connect to the other server in the cluster and issue the delete command from there.

Note:
You cannot delete a server from a cluster if it is the only server in the cluster since this is meaningless. If you wish to eliminate a cluster altogether, you can simply delete all IP addresses from the cluster.

Note:
If you delete a server and then add it again, it will be added as backup for all configured IP addresses.