The required hardware to add SyncMirror to an existing Clustered Failover system consists of:

Adding SyncMirror to an existing ONTAP cluster requires creating a second, mirrored plex for an aggregate. This new plex must reside on a separate pool of storage. The necessary hardware to accomplish this includes new disk shelves to house the disks for the mirrored plex, the appropriate cabling (e.g., SAS) to connect these shelves to the controller nodes, and potentially new host bus adapters (HBAs) if the existing nodes do not have sufficient available ports to support the additional shelves.

A. Disk shelves and cluster interconnect: The cluster interconnect is a prerequisite for the "existing Clustered Failover system" and is not new hardware required specifically for adding SyncMirror.

C. Disk shelves and cabling: This option is incomplete. It omits the potential and often necessary requirement for new adapters if the controller nodes lack available connectivity ports.

D. Disk shelves and termination switches: Termination switches are not a standard hardware component for connecting disk shelves to ONTAP controllers in this configuration.

1. NetApp ONTAP 9 Documentation

"High-Availability configuration overview": This documentation outlines the components of a high-availability system. When expanding such a system with SyncMirror

the addition of physical storage is a primary requirement. The documentation implicitly supports the need for shelves

connectivity (cabling)

and interface cards (adapters) to integrate the new storage. (Reference: NetApp ONTAP 9 Documentation Center

High-Availability Configuration Guide).

2. NetApp Technical Report

"TR-4529 - A-Z of NetApp SyncMirror Technology": This report details SyncMirror architecture. It explains that each plex must be on a separate set of disks

often in different shelves or locations. The physical connection of this new set of disks requires the standard hardware components for storage expansion: shelves

cables

and potentially adapters. (Section: "SyncMirror Configuration Requirements").

3. NetApp Documentation

"Disk and Aggregate Management": When describing the process of adding disks to create a new plex

the documentation details the physical installation steps. These steps involve racking shelves

connecting them via cables to the appropriate adapters on the controller nodes

confirming the system recognizes the new hardware path. (Reference: NetApp ONTAP 9 Documentation Center

Disk and Aggregate Management Guide

Section: "Adding disks to an aggregate").