Dell SCv2000 Tool Storage User Manual


 
4
Back-End Cabling and Connecting 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 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 is deployed with expansion enclosures, the expansion enclosures
connect to the SAS ports on the storage controllers.
SC100/SC120 Expansion Enclosure Cabling Guidelines
You can connect multiple SC100/SC120 expansion enclosures to an SCv2000/SCv2020 by cabling the
expansion enclosures in series.
The connection between a storage system and the 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.
SAS Redundancy
Use redundant SAS cabling to make sure that an unavailable IO port or storage controller does not cause
a Storage Center outage.
If an IO port or storage controller becomes unavailable, the Storage Center IO moves to the redundant
path.
SAS Port Types
There are two types of back-end SAS ports on each storage controller: initiator only and initiator/target.
The ports labeled A are initiator only ports and the ports labeled B are initiator/target ports.
Figure 57. SCv2000/SCv2020 SAS Ports
1. Storage system 2. Storage controller 1
Back-End Cabling and Connecting Power
67