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Two types of clusters are supported: soft clusters and
For more information about clustering, see Clustering‚ on page 144.
Transparency
The Intel NetStructure Cache Appliance can transparently intercept NNTP traffic bound for a well known NNTP server. By transparently intercepting, caching, and serving the NNTP data from a centralized parent news server, the appliance simplifies migration and administration while both increasing responsiveness and decreasing network use.
Posting
The Intel NetStructure Cache Appliance sends user article postings to the parent news server. You can specify the parent news server that receives postings for a particular group or set of groups from the
With background posting, the appliance queues posted articles until the posting news server can accept the posted article.
Maintaining the cache: updates and feeds
The Intel NetStructure Cache Appliance can maintain the freshness of its cache by:
✔Updating its cache on demand
✔Actively retrieving (pulling) updates at configured intervals
✔Accepting news feeds
You can configure the following options from both the Manager UI and the
Pull the overview information for specified groups:
For all groups designated as pullover, the server will retrieve the overview database information (using the OVER/XOVER commands) automatically and periodically. Pulling overview information can be useful for high volume groups that are frequently read but from which only a subset of the articles are accessed.
Appendix A Caching Solutions and Performance | 141 |