HiCommand Dynamic Link Manager User's Guide (for Windows(R))

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 7.5 online (Places a path or paths online). For details on the offline operation, see 7.4 offline (Places a path or paths offline).

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 Thunder 9200, Thunder 9500V Series, or TagmaStore AMS/WMS series, 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 7.5 online (Places a path or paths online). 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 Thunder 9200, Thunder 9500V Series, or TagmaStore AMS/WMS series, 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 4.2.6 Changing the path status and 6.2 Path Management window. For details on the offline and online operations, see 7.4 offline (Places a path or paths offline) and 7.5 online (Places a path or paths online).

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