Requirements for hot-adding disk shelves with IOM12 modules
Your system must meet certain requirements before hot-adding disk shelves with IOM12 modules.
State of your system
Your system and version of ONTAP must support the disk shelves you are hot-adding, including the IOMs, disk drives, and SAS cables.
Your system must have less than the maximum number of disk drives supported, by at least the number of disk shelves you plan to hot-add.
You cannot have exceeded the maximum number of disk drives supported for your system after hot-adding disk shelves.
If you are hot-adding a stack of one or more disk shelves directly to a platform controller, each controller must have enough available PCI SAS HBA or onboard SAS ports or a combination of both.
If you are using SAS HBAs, best practice is to use 12Gb SAS HBAs to keep controller-to-stack connectivity at 12Gbs for maximum performance.
Your system cannot have any SAS cabling error messages. You must correct any cabling errors using the corrective actions provided by the error messages.