Dell SC4020 - Back-End Connections for an SC4020 Storage System Without Expansion Enclosures; Back-End Connections for an SC4020 Storage System with Expansion Enclosures

3. Initiator only ports (ports A) 4. Initiator/target ports (ports B)
5. Storage controller 2
Back-End Connections for an SC4020 Storage System
Without Expansion Enclosures
When you deploy an SC4020 storage system without expansion enclosures, you must interconnect the
storage controllers using SAS cables. In a single-controller system, do not connect SAS back-end ports to
each other.
NOTE: The top storage controller is storage controller 1 and the bottom storage controller is
storage controller 2.
Figure 74. SC4020 Without Expansion Enclosures
1. SC4020 storage system 2. Storage controller 1
3. Storage controller 2
The following table describes the back-end SAS connections for an SC4020 storage system without
expansion enclosures.
Table 7.
Storage System Without Expansion Enclosures
Path Connections
Chain 1: A Side (Orange) Storage controller 1: port A to storage controller 2: port B.
Chain 1: B Side (Blue) Storage controller 2: port A to the storage controller 1: port B.
Back-End Connections for an SC4020 Storage System
With Expansion Enclosures
An SC4020 supports up fourteen SC200 expansion enclosures, up to seven SC220 expansion enclosures,
or any combination of
SC200/SC220 expansion enclosures as long as the total disk count of the system
does not exceed 192 disks.
The following sections show common cabling between the SC4020 and SC200/SC220 expansion
enclosures. Locate the scenario that most closely matches the Storage Center that you are configuring
and follow the instructions, modifying them as necessary.
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Connect the Back-End Cabling