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HP Hitachi Dynamic Link Manager Software User Manual

Page 160

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3. Creating an HDLM Environment

138

Set it to

on

to enable load balancing. Otherwise, set it to

off

. When you set

on

,

specify one of the following algorithm values after the

-lbtype

option:

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.

(2) 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.

(3) 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.