Parameters; To Set The Host Operating Environment - Hitachi XP P9500 User Manual

Parameters

To Set the Host Operating Environment

Table 6-2 Default and Recommended Values on page 6-16
defaults and recommended values for each setting. If you change the value
of the set operation, the new value takes effect immediately.
Item name
Load balancing
Intermittent error
monitoring
-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, be sure to also specify the intermittent error monitoring
interval and the number of times that the error is to occur. The system
assumes that an intermittent error is occurring if the specified number of
times that the error is to occur is reached during the monitoring interval.
A path that is assumed to have an intermittent error is excluded from
automatic failbacks. Intermittent error monitoring is performed on each
path. Intermittent error monitoring starts when a path is recovered from
an error by performing an automatic failback.
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:
¢
¢
6-16
Table 6-2 Default and Recommended Values
Default value
The Extended Least I/Os
algorithm is used.
off
When the intermittent error monitoring interval or the number of
times that the error is to occur has not been specified before:
The intermittent error monitoring interval is set to 30 minutes, and
the number of times that the error is to occur is set to 3.
When the intermittent error monitoring interval or the number of
times that the error is to occur has been specified before:
Command Reference
Hitachi Dynamic Link Manager User Guide (for VMware(R))
shows the
Recommended value
The recommended algorithm
depends on the operating
environment.
on