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
a Lenovo Storage V7000clustered 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, perform the following procedure to add LUNs:
- 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 Lenovo Storage V7000 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.