HP XP Racks - Manual (Page 135)

• rr for the Round Robin algorithm
• exrr for the Extended Round Robin algorithm
• 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 how to set up path health checking by using a
command:
# /usr/DynamicLinkManager/bin/dlnkmgr set -pchk on -intvl 10
When path health checking is enabled by specifying on for the -pchk
parameter, you can also specify the -intvl parameter, in order to specify the
checking interval. If the checking interval is not specified, then the previously
specified value will be automatically applied. For example, if you turn off path
health checking after the checking interval was specified as 15 minutes, and
then you enable path health checking again (but without specifying a
checking interval) the 15 value that was specified from before will be used
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 × 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 setting up automatic failback by using a
command:
Creating an HDLM Environment
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Hitachi Dynamic Link Manager User Guide for AIX®