Logical unit creation and deletion on HDS Thunder, Hitachi AMS 200, AMS 500, and AMS 1000, WMS100, and HDS TagmaStore WMS systems
The HDS Thunder, Hitachi AMS 200, AMS 500, and AMS 1000, WMS100, and HDS TagmaStore WMS 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 Storwize® V3700 clustered system is attached, data corruption can occur because the system might not realize that LUN B is different than LUN A.
Adding LUNs dynamically
- Create the new LUNs using the Storage Navigator Modular GUI.
- Quiesce all I/O operations.
- 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.
- Go into the LUN mapping function of the Storage Navigator Modular GUI. Add mapping for the new LUN to all of the controller ports that are available to the Storwize V3700 system on the fabric.
- Restart the controller. (Model 9200 only)
- After the controller 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.