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Appendix A Caching Solutions and Performance 143
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.
Carrier-class architecture
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.
Self-tuning DataFlow core
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.