Hitachi XP P9500 User Manual page 32

VM, and Virtual Storage Platform. In a non-cluster environment, the load
balancing function is available for the Thunder 9500V series, Lightning 9900
series, Lightning 9900V series, Hitachi AMS2000/AMS/WMS/SMS series,
Hitachi USP, Universal Storage Platform V/VM, Virtual Storage Platform, and
EMC DMX series. For details on the various cluster software that HDLM
supports, see Cluster Support on page 2-44.
Figure 2-7 Flow of I/O Data When the Load Balancing Function Is Not Used on
page 2-12 shows the flow of I/O data when the load balancing function is
not used. Figure 2-8 Flow of I/O Data When the Load Balancing Function Is
Used on page 2-13 shows the flow of I/O data when the load balancing
function is used. Both figures show examples of I/O operations being issued
for the same LU by multiple applications.
Figure 2-7 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 path (A) will cause a bottleneck, which
might cause problems with system performance.
2-12
HDLM Functions
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