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:
- 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 storage system ports that are available
to the system on the fabric.
- Restart the storage system
(Model 9200 only).
- 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.