Intel 1520 User Manual

Appendix A Caching Solutions and Performance

Obeying NNTP control messages

By default, the Intel NetStructure Cache Appliance periodically checks the parent 
server for new groups, cancelled articles, and new articles for nonfeed news 
groups. If you have enabled these periodic checks in the Configure: Protocols 
page, you do not need to configure the appliance to obey NNTP control 
messages. See Configuring NNTP‚ on page 31 for more information.

However, you can configure the appliance to obey NNTP control messages. In 
particular, you can enable the appliance to obey 

cancel

, 

addgroup

, and 

rmgroup 

messages in the Configure: Protocols page of the Manager UI. For 

example, if you select Obey cancel control messages, the appliance pulls 

cancel

 messages automatically to obey them.

Client bandwidth throttling

You can limit the amount of bandwidth allotted to clients for downloading 
articles. Clients that attempt to exceed the bandwidth limit will have each 
operation slowed to keep their bandwidth consumption to the limit. See 
Configuring NNTP‚ on page 31 for more information.

The Intel NetStructure Cache Appliance is designed for carrier class operation. It 
offers the following:

✔ High performance

✔ High availability

✔ Node fault tolerance

✔ Expansion capabilities

✔ Centralized management

Performance

By combining Intel NetStructure Cache Appliance nodes into clusters, you can 
multiply individual performance. The following sections describe the appliance’s 
performance features.

A streaming DataFlow I/O core transfers data to and from disk and network 
connections. This core adapts to both TCP network dynamics and disk 
performance dynamics to result in fast and continuous data flow through 
many thousands of simultaneous connections.