HP Hitachi Dynamic Link Manager Software User Manual
Page 40

2. HDLM Functions
18
Figure 2-7: Overview of load balancing
(2) When Using the Lightning 9900V Series, Hitachi USP, Universal Storage
Platform V/VM, Virtual Storage Platform, Hitachi AMS2000 Series, or Hitachi SMS
All online paths are owner paths. Therefore, for the example in Figure 2-6: Flow of
I/O Data When the Load Balancing Function Is Used, the load is balanced among the
four paths A, B, C, and D. If one of the paths were to become unusable, the load would
be balanced among the three, remaining paths.
2.6.2 Load Balancing Algorithms
HDLM has the following six load balancing algorithms:
• The Round Robin algorithm
• The Extended Round Robin algorithm
• The Least I/Os algorithm
• The Extended Least I/Os algorithm
• The Least Blocks algorithm
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