HP Hitachi Dynamic Link Manager Software - Manual (Page 45)

2. HDLM Functions
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Figure 2-8: 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
paths (A, B, C, and D). This helps to prevent problems with system performance and
helps prevent bottlenecks from occurring.
2.6.1 Paths to Which Load Balancing Is Applied
This subsection 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. When you set up an LU, you have to specify
which CHA to be used as the owner controller for the LU. Because different LUs might