IBM N series Hardware Manual page 154

3. Install the disk shelves, power them on, and set the shelf IDs.
For more information, see the Installation and Service Guide that came with your disk
shelf.
4. Create a port list to assign disk drives to the pools appropriately.
5. Cable the shelf-to-shelf connection (daisy-chain the disk shelves) in each stack.
For more information about daisy-chaining disk shelves, see the Installation and Service
Guide that came with your disk shelf.
6. Cable the first and last disk shelf in each stack to the controller SAS ports.
You verify the SAS connections later.
7. Connect and configure the controllers by following the procedure for the stretch
MetroCluster configuration that is described in the Data ONTAP High Availability and
MetroCluster Configuration Guide for 7-Mode.
This includes cabling the HA interconnect link as appropriate for your configuration.
8. Boot the system to Maintenance mode by completing the following steps:
a. Boot the system by entering the boot_ontap command.
b. Halt the boot process by pressing Ctrl+C.
c. Select the Maintenance mode option from the display menu.
The system boots to Maintenance mode.
9. Verify the SAS connections by entering the following command at the Maintenance mode
prompt of either controller:
sasadmin expander_map
10.The next step depends on the output:
– If the output lists all of the IOMs, the IOMs all have connectivity. Go to step 11.
– If any IOMs are not shown, the output does not show an IOM because it is cabled
incorrectly, or the output does not show all the IOMs downstream from the incorrectly
cabled IOM.
Repeat Steps 5 and 6 to correct cabling errors, then go to Step 9.
11.Assign the attached disk shelves to the appropriate pools by using the "Assigning disk
pools in a stretch MetroCluster configuration" procedure that is described in the Data
ONTAP High Availability and MetroCluster Configuration Guide for 7-Mode.
Be sure to also complete the "Verifying disk paths" procedure that you are directed to
afterward.
12.Verify that the disk shelves in the storage system have the latest version of disk shelf
firmware by completing the following steps:
a. Enter the following command at the storage system console (from normal mode):
sasadmin expander_map
b. Locate the disk shelf firmware information for the disk shelves in the output.
Example: 0151 is the disk shelf firmware version for shelf number one (Slot A/IOM A) in
the storage system:
Expanders on channel 4a:
Level 3: WWN 500a0980000840ff, ID 1, Serial Number ' SHU0954292G114C',
Product 'DS424IOM6', Rev '0151', Slot A
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IBM System Storage N series Hardware Guide