HP XP7 Storage - Manual (Page 215)

When you set the number of times that the error is to occur to 1, the
above condition does not need to be satisfied.
When you change the error monitor interval while intermittent error
monitoring is running, the new settings will take effect immediately.
When the checking interval is shortened and the checking interval
time after the change has already elapsed during the current checking
interval, the path status check will start over.
This setting remains stored in the system, even if you disable the
function by changing the setting of automatic failbacks to off.
Therefore, if you re-enable automatic failbacks and do not change the
interval, path status checks will be executed at the interval already
stored in the system.
When you upgrade from HDLM 03-00 or 03-01 to 05-00 or later:
When you upgrade to HDLM 05-00 or later from HDLM 03-00 or
03-01, and the -pchk parameter was already set to on in the previous
version, the -afb parameter will be set to on in the new version. The
value of the -intvl parameter will be set to the same value as the
previous checking interval of the -pchk parameter.
-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
Intermittent error monitoring can be enabled only when automatic
failback is set to on.
When you use automatic failback, we recommend that you set
intermittent error monitoring to on to prevent an intermittent error from
reducing I/O performance.
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:
¢
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:
The values specified from the last time are used.
Command Reference
6-23
Hitachi Dynamic Link Manager (for Windows®) User Guide