HP StorageWorks NAS Data Path Manager Software - Manual (Page 23)

NAS Data Path Manager
23 hp StorageWorks NAS Data Path Manager Installation and User’s Guide
The relationship between the path modes and states provides you with important
status information in a simplified way. Some of this information is
self-explanatory; other mode/state combinations require explanation.
The following table explains these relationships.
Table 2: Path Modes and States Explained
* The state of alternate paths is not shown in this table, unless that path is currently being
used. You can find the current state of any path by selecting the path, then selecting
Actions > Test Selected Path. The test will take up to two minutes, then a dialog box will
report the status of the path.
Situation Mode State Action
All paths are
in good
condition Preferred
Alternate
Active
*
Information is distributed (load is
balanced) among the active preferred
paths, alternate paths are available but
not being used.
Preferred path
fails Preferred
Off-line Failed You should repair the path as soon as
possible. When it is repaired it will be
used for the load balancing algorithm.
Preferred path
is set to
off-line by the
user Preferred
Off-line Failed You have taken the path off-line, so
the path does not necessarily need
repair. To restore the path, you must
put it back on-line. The path then
returns to it’s previous mode and state.
Alternate path
fails Alternate * You must repair the failed path.
Automatic Failback will then restore
the path so it can be used for failover.
Alternate path
is set to
off-line by the
user Alternate
Off-line * You have taken the path off-line, so
the path does not necessarily need
repair. To restore the path, you must
put it back on-line. The path then
returns to it’s previous mode and state.
Preferred
path(s) have
failed over to
an alternate
path Alternate Active Repair (or restore) the preferred
path(s) so normal operations will not
be interrupted if the alternate path
fails