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

2.9 Detecting errors by using path health checking

HDLM can check the status of paths at regular intervals, and detect errors. This functionality 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 or the Path Management window of the HDLM GUI to check the path error.

For example, in a normal state, I/O is not performed on the paths of the standby host in the cluster configuration or on the non-owner paths (that is, some of the paths that access the Thunder 9200, Thunder 9500V Series, and TagmaStore AMS/WMS series storage subsystem). Because of this, for the standby host or a host connected to non-owner paths, we recommend that you use path health checking to detect errors. This enables the system to use the most recent path-status information when selecting the switching destination.

You can configure path health checking by using the Options window of the HDLM GUI or by executing the dlnkmgr command's set operation. For details on the Options window, see 4.2.8 Viewing or setting up the operating environment and 6.3 Options window. For details on the set operation, see 7.6 set (Sets the operating environment).

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