HP Hitachi Dynamic Link Manager Software - Manual (Page 38)

2. HDLM Functions
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When the load balancing function is not being used, I/O operations converge on one
physical path (A). The load on the physical path (A) will cause a bottleneck, which
might cause deterioration of the whole system's performance.
Figure 2-6: Flow of I/O Data When the Load Balancing Function Is Used
When the load balancing function is being used, I/O operations are distributed via
physical paths (A), (B), (C), and (D). This prevents deterioration of the whole system's
performance from a bottleneck on one path.
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.