Dell Storage Center SCv2000 and SCv2020 Storage System Deployment Guide

Connect the expansion enclosures to one side of the chain at a time to maintain drive availability.

1. Remove the A-side cable (shown in orange) that connects storage controller 1: port A to storage controller 2: port B. The B-side cable continues to carry IO while the A-side is disconnected.
   Figure 1. Remove the A-Side Cable from the Storage Controllers

   1. Storage system

   2. Storage controller 1

   3. Storage controller 2

2. Cable the expansion enclosures to the A-side of the chain.
   1. Connect a SAS cable from storage controller 1: port A to the first expansion enclosure in the chain, top EMM, port A.
   2. Connect a SAS cable from storage controller 2: port B to the last expansion enclosure in the chain, top EMM, port B.
   Figure 2. Connect the A-Side Cables to the Expansion Enclosures

   1. Storage system
   2. Storage controller 1
   3. Storage controller 2
   4. Expansion enclosure 1
   5. Expansion enclosure 2