HP Hitachi Dynamic Link Manager Software - Manual (Page 286)

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Make sure that all the paths are online.
Make sure that PathStatus is Online. If a path is not online, Reduced
will be displayed.
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Make sure that for each path the combination of the CHA port
(ChaPort), through which multiple paths are accessing the same LU,
and the HBA port (the host port number and bus number displayed in
the PathName column) is different.
The digits displayed on the left of PathName indicate a host port
number. The numbers displayed between the period to the right of the
host port number and the next period indicate a bus number.
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Make sure that there are different host port numbers and bus
numbers for each physical HBA port.
Specify the -drv parameter and check the output information:
Execute the following command:
# /opt/DynamicLinkManager/bin/dlnkmgr view -drv > redirect-
destination-file-2
Open redirect-destination-file-2 and check the HDevName and Device
entries to see whether the HDLM device corresponding to the SCSI device
has been created.
Setting Up HDLM
HDLM includes functions like the load balancing function, the automatic
failback function, the error logging function, the audit logging function, etc.
You can set up these functions by using the dlnkmgr command's set
operation.
Checking the Current Settings
Check the current settings by executing the following command to set the
HDLM functionality by using the dlnkmgr command's view operation.
# /opt/DynamicLinkManager/bin/dlnkmgr view -sys -sfunc
HDLM Version : x.x.x-xx
Service Pack Version :
Load Balance : on(extended lio)
Support Cluster :
Elog Level : 3
Elog File Size(KB) : 9900
Number Of Elog Files : 2
Trace Level : 0
Trace File Size(KB) : 1000
Number Of Trace Files : 4
Path Health Checking : on(30)
Auto Failback : on(1)
Reservation Status :
Intermittent Error Monitor : off
Dynamic I/O Path Control : off(10)
KAPL01001-I The HDLM command completed normally. Operation name =
view, completion time = yyyy/mm/dd hh:mm:ss
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Creating an HDLM Environment
Hitachi Dynamic Link Manager User Guide for Linux ®