Logical unit creation and deletion on Hitachi TagmaStore AMS 2000 family of systems

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The Hitachi TagmaStore AMS 2000 family of systems Storage Navigator Modular Graphical User Interface (GUI) enables you to create and delete LUNs. You must avoid certain creation and deletion scenarios to prevent data corruption.

Creation and deletion scenarios

For example, the Storage Navigator Modular GUI enables you to create LUN A, delete LUN A, and then create LUN B with the same unique ID as LUN A. If the system is attached, data corruption can occur because the system might not realize that LUN B is different than LUN A.

Attention: Before you use the Storage Navigator Modular GUI to delete a LUN, remove the LUN from the storage pool that contains it.

Adding LUNs dynamically

To prevent the existing LUNs from rejecting I/O operations during the dynamic addition of LUNs, complete the following steps:
  1. Create the new LUNs using the Storage Navigator Modular GUI.
  2. Quiesce all I/O operations.
  3. Perform either an offline format or an online format of all new LUNs on the controller using the Storage Navigator Modular GUI. Wait for the format to complete.
  4. Go into the LUN mapping function of the Storage Navigator Modular GUI. Add mapping for the new LUN to all of the storage system ports that are available to the system on the fabric.
  5. Restart the storage system (Model 9200 only).
  6. After the storage system has restarted, restart I/O operations.

LUN mapping considerations

If LUN mapping is used as described in the LUN mapping topic, you must restart the controller to pick up the new LUN mapping configuration. For each storage pool that contains an MDisk that is supported by an LU on the system, all volumes in those storage pools go offline.