HP Hitachi Dynamic Link Manager Software User Manual

Page 109

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Table 6-2 Default and Recommended Values

Item name

Default value

Recommended value

Load balancing

The Extended Least I/Os

algorithm is used.

The recommended algorithm

depends on the operating

environment.

Intermittent error

monitoring

off

on

Number of times

the same path can

be used for

extended load

balancing

100

The recommended value depends

on the operating environment.

Dynamic I/O path
control

#

off
The checking interval is 10

minutes.

off
The recommended checking

interval depends on the operating

environment.

#

This item is applied only when Hitachi AMS2000 series, Hitachi SMS

series, or HUS100 series storage is used.

-lb on -lbtype {exrr|exlio|exlbk|vmwmru|vmwrr}

Specify the algorithm to be used for load balancing.
exrr: The Extended Round Robin algorithm
exlio: The Extended Least I/Os algorithm
exlbk: The Extended Least Blocks algorithm
vmwmru: The Most Recently Used algorithm (VMware)
vmwrr: The Round Robin algorithm (VMware)

-iem {on [-intvl error-monitoring-interval] [-iemnum number-of-
times-error-is-to-occur
]|off}

Enables or disables intermittent error monitoring.
on: Enabled
off: Disabled
To prevent I/O performance from dropping when an intermittent error

occurs, we recommend that you enable intermittent error monitoring. If
on is specified, in the subsequent parameters you can specify the

intermittent error monitoring interval and the number of times that the

error is to occur. If the specified number of times that the error is to

occur is reached during the specified monitoring interval (in minutes) on a

path, HDLM assumes that an intermittent error is occurring on the path. A

path that is assumed to have an intermittent error is excluded from

automatic failback. Intermittent error monitoring is performed on each

path.
If you omit the intermittent error monitoring interval or the number of

times that the error is to occur, each setting is specified as follows:

Command Reference

6-17

Hitachi Dynamic Link Manager User Guide for VMware

®

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