Deployment Guide
Connect the Back-End Cabling
Back-end cabling refers to the connections between the storage system and expansion enclosures.
An SCv3000 and SCv3020 storage system can be deployed with or without expansion enclosures.
NOTE: When expansion enclosures are not used, there is no need to interconnect the SAS port of a storage controller.
Topics:
• Expansion Enclosure Cabling Guidelines
• Back-End Connections to Expansion Enclosures
• Label the Back-End Cables
• Attach the Serial Cable
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 a SAS port on one storage controller and ends at a
SAS port the other storage controller.
You can connect multiple expansion enclosures to an SCv3000 and SCv3020 by cabling the expansion enclosures in series. However, the
SCv3000 and SCv3020 do not support the cabling of SCv300 and SCv320 expansion enclosures on the same SAS chain as SCv360
expansion enclosures.
You can connect multiple expansion enclosures to an SCv3000 and SCv3020 by cabling the expansion enclosures in series. However, the
SCv3000 and SCv3020 does not support the cabling of SCv300 and SCv320 Expansion Enclosures on the same SAS chain as SCv360
expansion enclosures.
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 Connections to Expansion Enclosures
The SCv3000 and SCv3020 supports up to 16 SCv300 expansion enclosures, up to eight SCv320 expansion enclosures, and up to three
SCv360 expansion enclosures per SAS chain.
The following sections show common cabling between the SCv3000 and SCv3020 and expansion enclosures. Locate the scenario that
most closely matches the Storage Center that you are configuring and follow the instructions, modifying them as necessary.
4
Connect the Back-End Cabling 47