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Appendix A Caching Solutions and Performance 145
Advanced protocol features
The appliance supports
✔ Performance features of the emerging HTTP 1.1 protocol, such as
persistent connections, request pipelining, and cache-control features.
✔ A rich set of commands to optimize the performance of NNTP
browsing, including support for RFC 977, such as the OVER, PAT,
XREPLIC and NEXT/PREV commands, and all common extensions.
✔ Caching of all NNTP data types and reception of news article feeds. See
News article caching‚ on page 138.
✔ FTP caching, Internet Cache Protocol (ICP) messaging, and the SNMP
protocol for network management.
Fast kernel packet engine
The appliance contains a high-speed core TCP/IP network packet engine
called the Adaptive Redirection Module (ARM). This packet engine supports
high-speed interception of traffic for transparency, supports automatic bypass
of sites that do not function properly with proxy caches, and efficiently
streams data to the Intel NetStructure Cache Appliance. See Transparent
proxy caching‚ on page 120 for more information.
High-availability
The Intel NetStructure Cache Appliance contains high-availability features that
work together to increase reliability, minimizing the impact of hardware or
software failures. The following sections describe these features.
Alarms
The appliance signals an alarm for any detected failure condition. Alarms are
presented on the Manager UI, and can be configured to send email or page
support personnel.
Pending alarms are indicated on the Dashboard of the Manager UI as a red lamp,
as shown in Figure 10.