Hello,
On step one, don't forget to set the shelf ID before connecting it to your SAN. See the DS4243 Installation guide for instructions:
http://support.netapp.com/documentation/docweb/index.html?productID=30411
Basically though, push and hold the Shelf ID button until the ID flashes, then push it again until it displays the correct shelf ID. Push and hold to commit the change, then reboot the shelf.
On steps 2 and 3, you will want to be aware that many Controllers are set to automatically assign new disk. To check this, type in this command on your controller CLI:
options disk.auto_assign
If it's set to ON, then your disks will be automatically and immediately assigned a controller once you connect them. If this is NOT desired behavior, then turn this option off first with options disk.auto_assign off
To manually assign, see the Physical Storage management Guide for your version of ONTAP. It details how the disk assign command works. In a nutshell, you log onto the controller you want to assign all of the disks to and type:
disk assign all
http://support.netapp.com/documentation/productlibrary/index.html?productID=30092
You can't resize an aggregate with that command. You add disks, not GB, to an aggregate. You need to use
aggr add
to add new disks to the aggregate. The Storage Management guide goes through that too. It basically looks like this:
aggr add aggr1 24@300
Hope that answers your questions!