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. Turn on the expansion enclosure being added. When the drives spin up, make sure that the front panel and power status LEDs show normal operation.
2. Disconnect the A-side cable (shown in orange) from the expansion enclosure: top EMM, port B. The B-side cables continue to carry IO while the A-side is disconnected.
   Figure 1. Disconnect A-Side Cable from the Existing Expansion Enclosure

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