Cable Requirements For Expansion Enclosures; Sas Topology - IBM 106 Hardware Installation And Maintenance Manual

Figure 57. Cables routed through CMA baskets

Cable requirements for expansion enclosures

When adding storage, use IBM qualified SAS cables, and observe the following guidelines:
• When installing SAS cables to expansion modules, use only supported HD mini-SAS (SFF-8644) x4
cables.
• Qualified HD mini-SAS copper cables, not to exceed 5 m (16.40'). For more information, see Table 9 on
page 63.
• The maximum expansion cable length allowed in any configuration is 5 m (16.40').
• When adding more than two expansion enclosures, you may need to purchase additional cables,
depending upon number of enclosures and cabling method used.
• You may need to order additional or longer cables when cabling a fault-tolerant configuration.

SAS topology

The star configuration topology of SAS is supported with the Model 106 enclosure.
The star configuration has each expansion enclosure connected from the host (server attached JBOD
configuration) or controller enclosure (EBOD configuration).
SAS cabling method
As you face the rear panel of the Model 106 enclosure, the left IOM/EBOD expander module slot is 1 and
the right IOM/EBOD expander module slot is 0. See also Figure 5 on page 10 for CRU slot index
numbering for the enclosure rear panel. Green is used to show IOM/EBOD expander module 0 paths and
blue is used to show IOM/EBOD expander module 1 paths for cabling the expansion enclosures shown in
each cascade.
50 IBM ESS expansion: Hardware Installation and Maintenance Guide - Model 106