NEC PathManager 3.4 Cluster liaison , 3 3. .4 4 C Cl lu us st te er r l, ia ai is so on n

Chapter 3 Functions of NEC Storage PathManager
for dynamic load balancing must be set for each unit.
Second argument 0: do not execute dynamic load balancing (specified when load balancing will not be
executed or when static load balancing will be executed)
Second argument 1: execute dynamic load balancing (in the round robin method)
Note also that the settings for dynamic load balancing cannot be made if the program is working
with MSCS.
3.4 Cluster liaison
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The cluster liaison function enables the use of NEC Storage PathManager in a cluster environment. When
abnormalities occur in I/O, NEC Storage PathManager first attempts to switch paths. If this does not work,
then the cluster control program will switch nodes. NEC Storage PathManager can be used in
EXPRESSCLUSTER (CLUSTERPRO) and MSCS (Microsoft cluster system) environments.
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EXPRESCLUSTER(CLUSTERPRO)
liaison
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This function allows NEC Storage PathManager to work in liaison with EXPRESSCLUSTER
(CLUSTERPRO). No particular settings are necessary to use this function.
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MSCS liaison
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This function allows NEC Storage PathManager to be used in an MSCS environment. Use the
-setmscsmode option of the spscmd to enable the MSCS liaison function. This function is disabled by
default. Use the -getmscsmode option to check the current settings.
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