Dell Storage Center SCv2000 and SCv2020 Storage System Deployment Guide

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

1. Disconnect the B-side cable (shown in blue) from the expansion enclosure: bottom EMM, port B. The A-side cables continue to carry IO while the B-side is disconnected.
   Figure 1. Disconnect B-Side Cable from the Existing Expansion Enclosure

   1. Storage system
   2. Storage controller 1
   3. Storage controller 2
   4. Expansion enclosure 1
   5. New expansion enclosure (2)
2. Use a new SAS cable to connect expansion enclosure 1: bottom EMM, port B to the new expansion enclosure (2): bottom EMM, port A.
3. Connect the B-side cable that was disconnected in step 1 to the new expansion enclosure (2): bottom EMM, port B.
   Figure 2. Connect B-Side Cables to the New Expansion Enclosure

   1. Storage system
   2. Storage controller 1
   3. Storage controller 2
   4. Expansion enclosure 1
   5. New expansion enclosure (2)