HP Hitachi Dynamic Link Manager Software - Manual (Page 50)

If there is a path failure immediately after a path is taken offline by using
either the an HDLM command, the status might change from Offline(C)
to Offline(E). If an offline operation was just performed, wait about 1
minutes, check the path status by using an HDLM command, and then
make sure that the status has changed to Offline(C). If it is still
Offline(E), retry the offline operation.
Monitoring Intermittent Errors (Functionality When
Automatic Failback Is Used)
An intermittent error refers to an error that occurs irregularly because of
something like a loose cable. In such a case, I/O performance might decrease
while an automatic failback is being performed to repair an intermittent error.
This is because the automatic failback operation is being performed
repeatedly (because the intermittent error keeps occurring). To prevent this
from happening, HDLM can automatically remove the path where an
intermittent error is occurring from the paths that are subject to automatic
failbacks. This process is called intermittent error monitoring.
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 view (Displays Information) on page
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.
2-26
HDLM Functions
Hitachi Dynamic Link Manager User Guide for Linux ®