Cabling disk shelves with IOM12 modules for a hot-add
You cable the SAS connections—shelf-to-shelf and controller-to-stack—as applicable for
hot-added disk shelves so they have connectivity to the system.
Before you begin
You must have met the requirements in
Requirements for hot-adding disk shelves with IOM12 modules and
installed, powered on, and set shelf IDs for each disk shelf as instructed in
Installing disk shelves with IOM12
modules for a hot-add
.
About this task
• For an explanation and examples of shelf-to-shelf “standard” cabling and shelf-to-shelf “double-wide”
cabling, see
Shelf-to-shelf SAS connection rules.
• For instructions about how to read a worksheet to cable controller-to-stack connections, see
How to read a
worksheet to cable controller-to-stack connections for multipathed connectivity
or How to read a worksheet
to cable controller-to-stack connections for quad-pathed connectivity
.
• After you have cabled the hot-added disk shelves, ONTAP recognizes them: disk ownership is assigned if
disk ownership automatic assignment is enabled; disk shelf (IOM) firmware and disk drive firmware should
automatically update if needed; and if in-band ACP is enabled on your configuration, it is automatically
enabled on the hot-added disk shelves.
Firmware updates can take up to 30 minutes.
Steps
1. If you want to manually assign disk ownership for the disk shelves you are hot-adding, you need to disable
disk ownership automatic assignment if it is enabled; otherwise, go to the next step.
You need to manually assign disk ownership if disks in the stack are owned by both controllers in an HA
pair.
You disable disk ownership automatic assignment before cabling the hot-added disk shelves and then later,
in step 7, you reenable it after cabling the hot-added disk shelves.
a.
Verify if disk ownership automatic assignment is enabled:
storage disk option show
If you have an HA pair, you can enter the command at the console of either controller.
If disk ownership automatic assignment is enabled, the output shows “on” (for each controller) in the
“Auto Assign” column.
b.
If disk ownership automatic assignment is enabled, you need to disable it:
storage disk option
modify -node _node_nam_e -autoassign off
You need to disable disk ownership automatic assignment on both controllers in an HA pair.
2. If you are hot-adding a stack of disk shelves directly to a controller, complete the following substeps;
otherwise, go to step 3.
a. If the stack you are hot-adding has more than one disk shelf, cable the shelf-to-shelf connections;
otherwise, go to substep b.
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