Hitachi Dynamic Link Manager Software Users Guide for VMWare

Function Default value Recommended value
Set on, if you want to collect
audit log data.
#
This function is applied only when Hitachi AMS2000 series, Hitachi SMS
series, or HUS100 series storage is used.
Setting Up Load Balancing
You can select whether to enable load balancing.
The following is an example of using a command to set load balancing.
dlnkmgr -s host-name -u user-name -p password set -lb on -lbtype
exlio
If you want to change the load balancing algorithm, specify one of the
following algorithm values after the -lbtype option:
• exrr for the Extended Round Robin algorithm
• exlio for the Extended Least I/Os algorithm
• exlbk for the Extended Least Blocks algorithm
• vmwmru for the Most Recently Used algorithm (VMware)
• vmwrr for the Round Robin algorithm (VMware)
Setting Up Intermittent Error Monitoring
To prevent I/O performance from dropping when an intermittent error occurs,
we recommend that you enable intermittent error monitoring.
When intermittent error monitoring is enabled, you can specify, as
intermittent error conditions, the error monitoring interval and the number of
times that the error needs to occur. The default value for the intermittent
error-monitoring interval is 30. The default value for the number of error
occurrences is 3.
HDLM assumes that an intermittent error has occurred on a path if
intermittent error monitoring is enabled and the specified error rate is
reached. A path that is assumed to have an intermittent error is excluded
from automatic failback. Each path is monitored.
To determine whether a path is invalid for an automatic failback, you can use
the results of the dlnkmgr command's view operation.
The following is an example of using a command to enable intermittent error
monitoring:
dlnkmgr -s host-name -u user-name -p password set -iem on -intvl 20 -
iemnum 2
Creating an HDLM Environment
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Hitachi Dynamic Link Manager (for VMware®) User Guide