Chapter 4 Operating NEC Storage PathManager
take up to a minute longer for NEC Storage PathManager to recognize path failures due to execution of
failover. To avoid such situations, it is recommended that paths having priorities in numerical sequence do
not have common resources.
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Ex
p
ress5800
NEC Storage
StoragePathSavior
Priority: 4 3 2 1
Storage PathManager
Figure 4-1 Setting priority (1)
In the next figure, path prior ities are set to 4, 2, 3, and 1 from left to right. In this case, only one execution of
failover is necessary to determine which path is going to be used next in the case of failures in a FC switch or
failures in the NEC Storage controller.
This setting is effective when conducting dynamic load balancing. Since paths having priorities that are in
numerical sequence do not share any resources, performance decrement due to resource problems is not likely
to occur.