Setting Up Path Health Checking; Setting Up The Automatic Failback Function - Hitachi XP P9500 User Manual

• lio for the Least I/Os algorithm
• exlio for the Extended Least I/Os algorithm
• lbk for the Least Blocks. algorithm
• exlbk for the Extended Least Blocks algorithm
The type of algorithm specified by the -lbtype parameter remains stored in
the system, even if, you disable the load balancing function by specifying -lb
off. If you decide to re-enable load balancing at a later time, and you do not
specify an algorithm, load balancing will still be executed by using the
algorithm that was previously specified.

Setting Up Path Health Checking

You can choose whether you want to use path health checking.
The following is an example of using a command to enable path health
checking.
# /opt/DynamicLinkManager/bin/dlnkmgr set -pchk on -intvl 10
To enable path health checking, specify on. Specify off otherwise. When you
specify on, you can use the -intvl parameter to specify the checking
interval. The value that was specified previously will be applied if the
checking interval is not specified. For example, specify the path health check
as off after specifying the checking interval as 15 minutes and executing.
Then, when executing after specifying the path health check as on without
specifying the checking interval, the 15 minutes that were specified
previously will be applied again.

Setting Up the Automatic Failback Function

When intermittent error monitoring is enabled and the number of error
occurrences is 2 or more, the following condition must be satisfied.
error-monitoring-interval >= checking-interval-for-automatic-
failbacks x number-of-times-an-error-is-to-occur-during-intermittent-
error-monitoring
If this condition is not satisfied, an error will occur and the warning message
KAPL01080-W will be output.
If this happens, change any of the following settings: the checking interval
for automatic failbacks, the intermittent error-monitoring interval, or the
number of times that the error needs to occur.
If you set the number of times that the error needs to occur to 1, the above
condition does not need to be satisfied.
The following is an example of using a command to enable automatic
failback:
3-186
Creating an HDLM Environment
Hitachi Dynamic Link Manager User Guide (for Linux(R))