HP XP P9500 Storage - Manual (Page 35)

remaining usable owner paths. When all owner paths cannot be used, load
balancing is performed among the non-owner paths.
For the example in Figure 2-7 Overview of Load Balancing on page 2-13 ,
suppose that in the owner controller of LU0 is CHA0. When the LU is
accessed, the load is balanced between the two physical paths A and B, which
are both owner paths. When one of the paths (A) cannot be used, then the
LU is accessed from the only other owner physical path (B). When both of the
owner physical paths (A and B) cannot be used, the load is then balanced
between two other, non-owner physical paths (C and D).
Figure 2-7 Overview of Load Balancing
When Using Other Than the Thunder 9500V Series and Hitachi AMS/WMS Series
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 on page 2-12 ,
the load is balanced among the four physical paths A, B, C, and D. If one of
the physical paths were to become unusable, the load would be balanced
among the three, remaining physical paths.
Note:
Load balancing is performed for the following storage systems:
¢
Lightning 9900 series
¢
Lightning 9900V series
¢
Hitachi USP series
¢
Universal Storage Platform V/VM series
¢
Virtual Storage Platform series
HDLM Functions
2-13
Hitachi Dynamic Link Manager User Guide for Solaris ®