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Network Server Accelerator (NSA HTTP)

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HP-UX Network Server Accelerator for HTTP (NSA HTTP)

The HP-UX Network Server Accelerator for HTTP (NSA HTTP) is a networking feature that improves Web server performance by maintaining an in-kernel cache of recently accessed Web pages.

When a user requests an HTML page contained in the NSA HTTP cache, the page is served directly from the in-kernel cache and requires no Web server involvement. Serving Web pages from the in-kernel cache instead of passing the requests to a user-space Web server minimizes instruction processing, which results in tremendous performance improvement. In addition, NSA HTTP provides a general framework that can be used to accelerate other network application-layer protocols.

Table 1 lists the NSA HTTP version available in the HP-UX 11i v1, HP-UX 11i v2, and HP-UX 11i v3 operating environments.

Table 1. NSA HTTP Versions
      Operating System         Version Number 
 HP-UX 11i v1  01.03
 HP-UX 11i v2  01.03  
 HP-UX 11i v3  01.03

What is New in NSA HTTP B.

Starting from NSA HTTP B., you must manually activate NSA HTTP on the HP-UX 11i v3 system. For the procedure to manually activate NSA HTTP, see NSA HTTP B. Release Notes at HP-UX 11i v3 Networking Software .

Features and Benefits

NSA HTTP provides the following features:

  • Superior Web server performance
  • Generic framework for accelerating network request processing
  • Network Server Accelerator capability available on a per-port basis
  • HTTP in-kernel data caching
  • HTTP protocol processing facility
  • Virtual Web server support
  • Binary format logging
  • Log file format conversion utility

System Requirements

Table 2 lists the system requirements for NSA HTTP.

Table 2. System Requirements
      Operating System         Patch Depedency 
 HP-UX 11i v1  PHNE_28089
 HP-UX 11i v2  No patch dependency  
 HP-UX 11i v3


The following product documentation is provided with the NSA HTTP product:

  • nsahttp.1 man page
  • NSA HTTP Release Notes

The Release Notes delivered with the NSA HTTP product are located at /usr/share/doc/RelNotes.nsahttp.txt.

In addition, the following documentation on the Network Server Accelerator is available at HP-UX Networking Software.

  • Network Server Accelerator HTTP Performance White Paper
  • HP-UX 11i NSA HTTP Release Notes (HP-UX 11i v1)
  • HP-UX 11i NSA HTTP B. Release Notes (HP-UX 11i v2)
  • HP-UX 11i NSA HTTP B. Release Notes (HP-UX 11i v3)

Technical Support

NSA HTTP product is supported by HP Worldwide Response Centers for customers with an HP-UX support contract

Additional product information
Product #: NSAHTTP
Version: 01.03/01.03/01.03
Software specification: HP-UX 11i version 1(NSAHTTP-11iV1.depot)
HP-UX 11i version 2(NSAHTTP-11iV2.depot)
HP-UX 11i version 3(NSAHTTP_B.