Fde Considerations; Connecting The Controller Enclosure And Optional Expansion Enclosures; Cable Requirements For Expansion Enclosures - Seagate RealStor 5005 Series Hardware Installation

d. Remove the enclosure until it reaches the hard stops—approximately 400 mm (15.75")—and tighten the
mounting screws in the front rail kit bracket.
e. Return the enclosure to the fully home position.

FDE considerations

The Full Disk Encryption feature available via the management interfaces requires use of self-encrypting drives (SED)
which are also referred to as FDE-capable disk drive modules. When installing FDE-capable disk drive modules, follow the
same procedures for installing disks that do not support FDE. The exception occurs when you move FDE-capable disk
drive modules for one or more disk groups to a different system, which requires additional steps.
The procedures for using the FDE feature, such as securing the system, viewing disk FDE status, and clearing and
importing keys are performed using the SMC or CLI (see the Storage Management Guide or CLI Reference Guide for more
information).
NOTE: For more information about FDE, see the Storage Management Guide.

Connecting the controller enclosure and optional expansion enclosures

5005/4005 Series controller enclosures—available in 24-drive (2.5") or 12-drive (3.5") chassis—support up to ten
enclosures (including the controller enclosure), or a maximum of 240 disk drives. The enclosures support both
straight-through and reverse SAS cabling. Reverse cabling allows any drive enclosure to fail—or be removed—while
maintaining access to other enclosures. Fault tolerance and 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. Controller and expansion modules are identified by
enclosure ID and IOM ID, such as 0A and 0B for controller enclosures, 1A and 1B for the first expansion enclosure in a
cascade, and so forth. When connecting multiple expansion enclosures, use reverse cabling to ensure the highest level of
fault tolerance, enabling controllers to access remaining expansion enclosures if an expansion enclosure fails.

Cable requirements for expansion enclosures

When adding storage, use only Seagate RealStor or OEM-qualified cables, and observe the following guidelines:
• When installing SAS cables to expansion modules, 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 enclosures in the rack.
• The maximum expansion cable length allowed in any configuration is 2 m (6.56').
• When adding more than two drive 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 reverse-cabling a fault-tolerant configuration.
The rear panel view of the 2U12 and 2U24 controller enclosures are nearly identical to one another. The rear panel views
of the expansion enclosures are also nearly identical to one another.
FDE considerations 39