Check The Disk Count Before Adding An Expansion Enclosure; Add An Sc200/Sc220 Expansion Enclosure To The A-Side Of The Chain - Dell SC4020 Deployment Manual

b. In the Storage tab navigation pane, select the Disks node.
c. Click Manage Unassigned Disks. The Manage Unassigned Disks dialog box opens.
d. From the Disk Folder drop-down menu, select the disk folder for the unassigned disks.
e. To change which disks will be assigned to the disk folder, click Change.
f. To schedule a RAID rebalance select one of the following options.
• To start a RAID rebalance after creating the disk folder, select Perform RAID rebalance
immediately.
• To schedule a RAID rebalance for a later time, select Schedule RAID rebalance then select a
date and time.
g. Click OK.
7. Label the new back-end cables.

Check the Disk Count before Adding an Expansion Enclosure

Use the Dell Storage Manager Client to determine the number of drives that are currently accessible to
the Storage Center.
1. Connect to the Storage Center using the Dell Storage Manager Client.
2. Select the Storage tab.
3. In the Storage tab navigation pane, select the Disks node.
4. On the Disks tab, record the number of drives that are accessible by the Storage Center.
Compare this value to the number of drives accessible by the Storage Center after adding an
expansion enclosure to the storage system.

Add an SC200/SC220 Expansion Enclosure to the A-Side of the Chain

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 I/O while the A-side is disconnected.
Figure 133. Disconnect A-Side Cable from the Existing Expansion Enclosure
1. Storage system
3. Storage controller 2
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.
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2. Storage controller 1
4. Expansion enclosure 1
Adding or Removing an Expansion Enclosure