Hitachi XP P9500 User Manual page 33

Figure 2-5 Flow of I/O Data When the Load Balancing Function Is Not
Used
When the load balancing function is not used, I/O operations converge onto a
single path (A). The load on that one physical path (A) will cause a
bottleneck, which might cause problems with system performance.
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HDLM Functions
Hitachi Dynamic Link Manager User Guide (for Solaris(R))