HP LocalDirector Controller (hp ldc) works
with Cisco LocalDirector by automatically generating the information
needed by Cisco LocalDirector to load balance TCP/IP traffic across
multiple servers. hp ldc, specifically the HP
LocalDirector Control daemon (ldc_agt), must be configured and running on each system
that is managed by Cisco LocalDirector. Information regarding Cisco
LocalDirector can be found at the URL http://www.cisco.com/warp/public/cc/cisco/mkt/scale/locald/index.shtml.
The information generated by hp ldc is
referred to as "weights" in this document. The
weights help Cisco LocalDirector determine which system has the
resources to process an incoming request.
Initial weights are generated by the Webstone benchmark tool.
Webstone generates traffic to a system and calculates the throughput
based on getting different-sized static pages in three minutes.
The throughput is used to calculate the initial weights.
hp ldc adjusts the weights depending on
CPU usage and system load. Both the CPU usage and system load (measured
by a one minute average job queue) must reach their configured thresholds
before the weights are lowered. The weights will range between one
and the initial weights.
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