HP Hitachi Dynamic Link Manager Software - Manual (Page 213)

3. Creating an HDLM Environment
191
•
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
When you set this value to
on
, specify
rr
for round robin or
exrr
for extended round
robin after the
-lbtype
option. The type of algorithm specified by the
-lbtype
parameter remains stored in the system, even when you disable the load balancing
function by specifying
-lb off
. Therefore, when you re-enable the load balancing
function without specifying an algorithm, load balancing will be executed according
to the algorithm stored in the system.
(2) Setting Up Path Health Checking
You can choose whether you want to use path-health-checking function.
The following is an example of how to set up path health checking by using a
command:
# /opt/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.
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.