Hitachi Dynamic Link Manager Software Users Guide for AIX

User operation
Number of
errors and time
passed since
error
monitoring
started
Information
about paths
not subject to
automatic
failback
Placing the path Online
while intermittent error
monitoring is being
performed
Inherited (Not applicable)
If a path has
been removed
from the paths
subject to
automatic
monitoring, that
path is no longer
monitored.
Restarting the HDLM manager
Reset
#3
Inherited
Restarting the host Reset Reset
#1
When you turn the intermittent error monitoring function off, information
about paths not subject to automatic failback will be reset. If you do not
want to reset the information about paths not subject to automatic
failback when you turn the intermittent error monitoring function off,
change the target paths to Offline(C).
#2
The number of errors and the time passed since error monitoring had
started are both reset to 0, and then monitoring restarts from the time
the setting change is made in accordance with the changed monitoring
conditions.
#3
The number of errors and the time passed since error monitoring had
started are both reset to 0, and then monitoring restarts from the time
the HDLM manager starts.
Detecting errors by using path health checking
HDLM can check the status of paths for which I/O operations are not being
performed at regular intervals. This function is called path health checking.
Without path health checking, an error is not detected unless I/O is
performed because the system only checks the path status when I/O is
performed. With path health checking, however, the system checks the status
of online paths at regular intervals regardless of whether I/O is performed. If
an error is detected in a path, path health checking functionality switches the
status of that path to Offline(E) or Online(E), so you can use the dlnkmgr
command's view operation to check the path error.
HDLM Functions
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Hitachi Dynamic Link Manager (for AIX) User Guide