Checking Intermittent Errors; Setting Up Intermittent Error Monitoring; Intermittent Error Monitoring Actions - Hitachi XP P9500 User Manual

We recommend that you use intermittent error monitoring along with the
automatic failback function.
A path in which an error occurs a specified number of times within a specified
interval is determined to have an intermittent error. The path where an
intermittent error occurs has an error status until the user chooses to place
the path back online. Failbacks are not performed for such paths. This status
is referred to as the not subject to auto failback status.

Checking intermittent errors

You can check the paths in which intermittent errors have occurred by
viewing the execution results of the HDLM command's view operation.
For details on the view operation, see
6-30.

Setting up intermittent error monitoring

When you enable the intermittent error monitoring function, specify the
following monitoring conditions: the error monitoring interval, and the
number of times that the error needs to occur. If an error occurs on a
particular path the specified number of times within the specified error-
monitoring interval, then an intermittent error will occur on the path. For
example, if you specify 30 for the error monitoring interval and 3 for the
number of times that the error needs to occur, the path is determined to
have an intermittent error if an error occurs 3 or more times in 30 minutes.
You can set up intermittent error monitoring by executing the dlnkmgr
command's set operation.
Intermittent error monitoring can be used only when automatic failback has
already been enabled. The values that can be specified for intermittent error
monitoring depend on the values specified for automatic failbacks. For details
on how to specify the settings, see
on page

Intermittent Error Monitoring Actions

Intermittent error monitoring is performed on each path, and it automatically
starts as soon as a path is recovered from an error by using the automatic
failback function.
This subsection describes the following intermittent error monitoring actions:
• When an intermittent error occurs
• When an intermittent error does not occur
• When the conditions for an intermittent error to occur are changed during
error monitoring
6-16.
HDLM Functions
Hitachi Dynamic Link Manager User Guide (for AIX(R))
view (Displays Information) on page
set (Sets Up the Operating Environment)
2-23