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

1.2 HDLM features

HDLM has the following features.

Distributes the load across paths (load balancing)

When multiple paths connect a host and storage subsystem, HDLM distributes the load across the paths. This prevents a heavily loaded path from affecting processing speed.

For details on load balancing, see 2.6 Load distribution using load balancing.

Allows processing to continue if there is a failure (failover)

When multiple paths connect a host and storage subsystem, HDLM automatically switches to another path if there is a failure in a path being used. This allows processing to continue without being affected by the failure.

For details on failover, see 2.7 Failover and failback using path switching.

Allows you to place online a path recovered from an error (failback)

When a path recovers from an error, HDLM can place the path online. This enables the maximum number of paths to be online, which in turn enables HDLM to distribute the load for each path.

Route failbacks can be performed manually or automatically. In an automatic failback, HDLM automatically restores the route to the active state after the user has corrected the problem in the physical route.

For details on failback, see 2.7 Failover and failback using path switching.

Automatically checks the path status at regular intervals (path health checking)

HDLM can detect errors by checking the status of the paths at user-defined time intervals. This allows you to check for any existing path errors and to resolve them accordingly.

For details on path health checking, see 2.9 Detecting errors by using path health checking.

Allows you to use a GUI to operate HDLM visually (HDLM GUI)

HDLM uses a configuration-diagram or list format to display information about paths between hosts and Hitachi storage subsystems. You can use the GUI to change the status of a path, and to set the operating environment.

For details on the HDLM GUI, see 4.2 HDLM operations using the HDLM GUI and 6.1 HDLM GUI windows.

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