The HDS Thunder, HDS TagmaStore AMS, 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
a SAN Volume Controller cluster
is attached, data corruption can occur because the cluster 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 managed disk group 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 controller ports that
are available to the SAN Volume Controller cluster
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
managed disk group that contains an MDisk that is supported by an
LU on the system, all virtual disks in those managed disk groups go
offline.