That is a simple question, and at the same time a loaded question. First off, call NetApp support if you are not comfortable doing this. They'll walk you through it.
My post is assuming you are running Multi-path HA.
If this is an HA pair I'd run the following options command on both NetApp controllers...
options disk.auto_assign off
Do not cable the shelf up yet. If the shelf has the same ID as another already running it could cause some issues. NetApp does a good job at keeping same shelf ID's separate, but...
Power on the SAS shelf, set the ID that you want the shelf to be. Usually odds are on controller A and evens on controller B (i.e. fas01-a 10-19, 30-30, etc, while fas01-b 20-29, 40-49, etc.)
After setting the ID on the shelf power the shelf off for 30 seconds. Wait 60 if you want to be sure... It takes some time for the ID to "burn in" and actually set itself.
Power the shelf back on, and add the shelf into the loop. I've stuck to the old school way of A --> D, C --> B. But if you don't know how to install a shelf I've probably lost you already.
Think of the square port as the "Stop" sign. That is where the loop "ends". So from fas01-a port A --> shelf1 Module A square. If you added a second shelf, Module A circle should go to shelf2 Module A square, this then goes to fas01-b port D.
I highly recommend calling NetApp support (you've paid for it might as well use it). Also I recommend reading the setup guide for your particular NetApp controller. It should show you exactly how to configure a single or dual controller configuration (way better than I can describe in words). Log onto the NOW site (now.netapp.com) and click on "Documentaiton -> Product Documentation -> Choose your FAS series -> Installation and Setup Instructions.
This document will show you how the cabling should look like.
Once you get the shelf added, you are going to need to assign the disks to the controller. If you want all disks assigned to one controller (which is recommended) run the "disk assign all" command on that controller. You'll then need to add the disks to the aggregate or create a new aggregate if the disk sizes/speed are different or you've reached your aggregate size limit, but you'll need to calculate the optimal raid group size as well. You don't want a small raid group or you'll run into performance issues.
This does not account for EVERYTHING and all scenarios, which is why it is a simple question but a loaded one.
I would agree with Ryan above and strongly suggest you open a case with NetApp support as a place holder. Be very cautious and thorough if trying this procedure on your own. As always be sure to make any sort of changes within an approved maintenance window and with a supporting change request.
The DS42xx and DS14MK2 aren't supported with everything.
Did you get confirmation that you are running a compatible configuraiton? WHen you add just one link from the NetApp to these shelves your NetApp should see the disks (disk show -n) <-- Non owned disks.
If you aren't seeing disks that means something is not either cabled right, or it isn't a supported config.
Ok I did some digging and found out that you have everything configured correctly. Great job! Here is the simplest way to explain what I did. If this is something you need to do again in the future, just compare old asup's to new one's with the info below and it will tell you exactly what you need. Bottom line, eq-ntap2 has all of your spares and you can start adding to your aggregates from that pool of disks.
Looked at an old autosupport and compared it with a new one.....
I was correct in my assumption about the shelf I called out above. You will notice it's not on the old asup.
Expanders on channel 2a:
Level 3: WWN 50050cc10312b83f, ID 10, Serial Number ' SHU0954293G1FHG', Product 'DS424IOM3 ', Rev '0132', Slot A
Expanders on channel 2d:
Level 3: WWN 50050cc1047328ff, ID 12, Serial Number ' SHU0971734NM9N0', Product 'DS424IOM3 ', Rev '0132', Slot B
Then, just take a look at home many more spares you now have in the new config. You will notice there are exactly 24 more.
Pool0 spare disks
RAID Disk Device HA SHELF BAY CHAN Pool Type RPM Used (MB/blks) Phys (MB/blks)
Just to provide one last piece of info on this. TDUBB1234 and I had a discussion offline about disk ownership. The disks are currently owned by node 2, but the option is there to change ownership if need be.