Deployment Guide

Connect the Back-End Cabling and Connect the

Power

Back-end cabling refers to the connections between the storage system and expansion enclosures. After the back-end cabling is

complete, connect power cables to the

storage system components and turn on the hardware.

An SCv2000/SCv2020 storage system can be deployed with or without expansion enclosures.

• When an SCv2000/SCv2020 storage system is deployed without expansion enclosures, the storage controllers must be

interconnected using SAS cables. This connection enables SAS path redundancy between the storage controllers and the

internal disks.

• When an SCv2000/SCv2020 storage system is deployed with expansion enclosures, the expansion enclosures connect to the

back-end SAS ports on the storage controllers.

Expansion Enclosure Cabling Guidelines

The connection between a storage system and expansion enclosures is referred to as a SAS chain. A SAS chain is made up of two

paths, which are referred to as the A side and B side. Each side of the SAS chain starts at the initiator only SAS port on one

storage

controller and ends at the initiator/target SAS port the other storage controller.

Back-End SAS Redundancy

Use redundant SAS cabling to make sure that an unavailable I/O port or storage controller does not cause a Storage Center outage.

If an I/O port or storage controller becomes unavailable, the Storage Center I/O continues on the redundant path.

Back-End SAS Port Types

Each storage controller has two types of back-end SAS ports: initiator only and initiator/target.

The ports labeled A are initiator-only ports and the ports labeled B are initiator/target ports.

Figure 60. SCv2000/SCv2020 SAS Ports

Storage system 2. Storage controller 1

3. Initiator only ports (ports A) 4. Initiator/target ports (ports B)

5. Storage controller 2

Connect the Back-End Cabling and Connect the Power