HiCommand Dynamic Link Manager (HDLM) for Windows Systems User's Guide (HIT5201-96001, January 2008)

30 Chapter 2 HDLM Functions
2.7.2 Manual Path Switching
You can switch a path by manually placing a path online or offline. Manually switching a
path temporarily is useful for maintenance of the system.
You can manually place a path online or offline in the following ways:
 Use the Path Management window of the HDLM GUI.
 Execute the dlnkmgr command's online or offline operation.
For details on the online operation, see section
7.5. For details on the offline
operation, see section
7.4.
However, the status of the last path for a specific LU in offline status cannot be manually
switched to offline. Also, the status of a path whose error has not been recovered cannot be
switched to online.
HDLM selects the switching destination path the same way as for automatic path switching.
When using the TagmaStore AMS/WMS series, Thunder 9500V Series, or Thunder 9200, HDLM
selects the switching destination path from owner paths and then from non-owner paths.
When the Lightning 9900 Series, Lightning 9900V,TagmaStore USP, or Universal Storage
Platform V is being used, all paths that access the same LU are candidates for the switching
destination path. All other paths that run through the same path are switched.
Changing the path status online in the Path Management window, or executing the online
operation places the offline path online. For details on the online operation, see
section
7.5. After the path status is changed to online (by using the Path Management
window or by executing the online operation), HDLM selects the path to use in the same
way as for automatic path switching. When using the TagmaStore AMS/WMS series, Thunder
9500V Series, or Thunder 9200, HDLM selects the path to use from online owner paths, and
then from online non-owner paths. When the Lightning 9900 Series, Lightning 9900V Series,
TagmaStore USP, or Universal Storage Platform V is being used, since all the paths are owner
paths, the path to use is not switched even if you change the path status to online by using
the Path Management window or the online operation.
For details on the operation for changing the path status in the Path Management window,
see sections
4.2.6 and 6.2. For details on the offline and online operations, see sections
7.4 and 7.5.