Installation 67
performance requirements determine whether to optimize the configuration for high availability or
high performance when cabling.
Cabling diagrams in this section show fault-tolerant cabling patterns. RAID controller and expansion
IOMs are identified by chassis ID and IOM ID, such as 0A and 0B for controllers (RAID chassis), 1A and
1B for the first expansion chassis IOMs in a cascade, and so forth. When connecting multiple
expansion chassis, use reverse cabling to ensure the highest level of fault tolerance, enabling
controllers to access remaining expansion chassis if an expansion chassis fails.
Cable Requirements for Expansion Chassis
When adding storage, use only Quantum or OEM-qualified cables, and observe the following
guidelines:
• When installing SAS cables to expansion IOMs, use only supported HD mini-SAS x4 cables.
• Qualified HD mini-SAS to HD mini-SAS 0.5 m (1.64') cables are used to connect cascaded chassis in
the rack.
• The maximum expansion cable length allowed in any configuration is 2 m (6.56').
• When adding more than two expansion chassis, you may need to purchase additional cables,
depending upon number of RAID chassis, expansion chassis, and cabling method used.
• You may need to order additional or longer cables when reverse-cabling a fault-tolerant
configuration.
The rear panel view of the 2U12 and 2U24 RAID chassis are identical to one another. The rear panel
views of the expansion chassis are also identical to one another.
Whether configured as a RAID chassis or expansion chassis, the rear panel view of the 5U84 is very
different than the 2U12 or 2U24. Although the 5U84 uses the same controllers and expansion IOMs
used in the 2U chassis, the remaining CRUs accessible from the chassis rear panel differ from those
used in the 2U chassis.
NOTE: For clarity, the schematic diagrams show only relevant details such as the controller and
expansion IOM face plate outlines and expansion ports.
For RAID chassis and expansion chassis rear view detailed illustrations refer to the following sections:
• QXS-G2-412, QXS-G2-424, and QXS-G2-484 RAID Chassis Rear View (4-Host Port Controllers) on
page 18
• QXS-G2-312 and QXS-G2-324 RAID Chassis Rear View (2-Host Port Controllers) on page 16
• 2U12-Drive/2U24-Drive Expansion Chassis Rear View on page 19
• 5U84 RAID Chassis (Rear View/Two CNC Controllers) on page 24
• 5U84 Expansion Chassis (Rear View) on page 26
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