HP Hitachi Dynamic Link Manager Software User Manual
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2. HDLM Functions
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Figure 2-6: Flow of I/O Data When the Load Balancing Function Is Used
When the load balancing function is used, I/O operations are distributed via multiple
physical paths (A, B, C, and D). This helps to prevent problems with system
performance and helps prevent bottlenecks from occurring.
2.7.1 Paths to Which Load Balancing Is Applied
This section describes, for each type of storage system, the paths to which the load
balancing function is applied.
(1) When Using the Thunder 9500V Series, or Hitachi AMS/WMS series
When HDLM performs load balancing, it differentiates between load balancing among
owner paths and among non-owner paths. An owner path is a path that passes through
the owner controller for a target LU. This path is set on the owner controller of the
storage system LU. Because the owner controller varies depending on the LU, the