Route 2U Enclosure And Expansion Data Cables - Seagate Exos X 4006 Series Hardware Installation And Maintenance Manual

4. You must use a provided power cord that has a tested, safe electrical earth connection for storage enclosure power supply.
5. Confirm the storage enclosure connection to earth before applying power to it.
6. Do not operate a storage enclosure with less than the provided 2 PCMs, other than to provide in-service maintenance
within the required time allotment.
IMPORTANT Use only Cat-6 or above cables with RJ-45 connectors for Base-T connections.
IMPORTANT Use only Seagate approved HD mini-SAS (SFF-8644) x4 data cables that are at least .5m (1.64 ft) in length
and do not exceed 3m (9.84 ft) in length to connect to the SAS ports on each controller module.

Route 2U enclosure and expansion data cables

The 2U storage enclosure supports SAS cabling for up to 3 expansion enclosures and several methods for connectivity to a
switch or the host system. Select data cables that best align with available controller module ports and your host environment.
Fault tolerance and performance are key factors in determining how to best optimize your particular system and cabling
configuration. This topic assumes a fault-tolerant reverse cabling method, since it provides a method of maintaining access to
all enclosures in the chain, even if one of the enclosures fails or requires removal. If you use the high-performance straight-
through cabling method, it is less fault tolerant. When using straight-through cabling, a failed enclosure in the chain prevents
access to enclosures further down the chain until you address the fault.
You must comply with all SAS cabling requirements and confirm that they meet all related standards.
The maximum length of any SAS cable for any configuration is 2 m (6.56-ft).
l
All SAS cables you connect to expansion modules must be mini-SAS HD cables with SFF-8644 connectors.
l
CAUTION Do not create invalid closed loops anywhere along the SAS port cabling configuration. A valid cabling
configuration is directional and does not contain any loops between components already in that cabling configuration. An
invalid closed loop introduces a circular flow into the cabling configuration that can degrade performance or cause failure.
To route 2U enclosure and expansion data cables:
1. Route data and management cables from the host system to the best available controller module port for your
environment.
a. Connect SAS cables from the SAS ports to the host switch or HBA as shown.
b. (Optional) Connect an Ethernet cable from the management port to the host as shown.
31 Chapter 4 Installation of 2U enclosures