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Lenovo S3200 Setup Manual: Hd Mini-sas Host Connection; Single-controller Configurations

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HD mini-SAS host connection

To connect S3200/S2200 SAS controller modules supporting SAS host interface ports to a server HBA or
switch —using the controller's SFF-8644 dual HD mini-SAS host ports—select a qualified HD mini-SAS
cable option.
S3200 host ports support standard cables. For S2200 host ports, management interfaces distinguish
between standard (dual cable with single connector at each end), and fan-out SAS cables. The fan-out
SAS cable is comprised of a single SFF-8644 connector that branches into two cable segments, each of
which is terminated by a connector. The terminating connectors attach to the host or switch, and are either
both type SFF-8644 or SFF-8088. The storage system must be cabled using either standard cables or
fan-out cables: a mixture of cable types is not supported. Qualified cable options for each of these SAS
cable categories are described herein.
SAS cables with single connector at each end
A qualified SFF-8644 to SFF-8644 cable option is used for connecting to a 12 Gbit/s enabled host;
whereas a qualified SFF-8644 to SFF-8088 cable option is used for connecting to a 6 Gbit/s host.
Qualified SFF-8644 to SFF-8644 options support cable lengths of 0.5 m (1.64'), 1 m (3.28'), 2 m (6.56'),
and 4 m (13.12'). Qualified SFF-8644 to SFF-8088 options support cable lengths of 1 m (3.28'), 2 m
(6.56'), 3 m (9.84'), and 4 m (13.12').
SAS cables with fan-out connectors
Use of a bifurcated fan-out cable doubles the number of server host ports that can be connected to an HD
mini-SAS controller module. A qualified SFF-8644 to SFF-8644 fan-out cable option is used for attaching to
a 12 Gbit/s enabled host; whereas a qualified SFF-8644 to SFF-8088 fan-out cable option is used for
attaching to a 6 Gbit/s host. Qualified fan-out cable options support lengths of 1 m (3.28'), 2 m (6.56'),
and 4 m (13.12').
IMPORTANT: Before attaching a fan-out cable, make sure to update firmware for the SAS HBA—and
switch if applicable—for devices that will be attached to the fan-out cable.
See the Storage Manager Guide or CLI Reference Guide for more information about the fan-out setting
and changing of host-interface settings for controller modules.
NOTE: Supported qualified cable options for host connection are subject to change.
NOTE: The diagrams that follow use a single representation for each CNC cabling example. This is due
to the fact that the CNC port locations and labeling are identical for each of the three possible
interchangeable SFPs supported by the system.
Within each cabling connection category, the HD mini-SAS model is shown beneath the CNC model.

Single-controller configurations

A single-controller configuration provides no redundancy in the event of controller failure. If the controller
fails, the host loses access to the storage data. This configuration is suitable only in environments where
high availability is not required, and loss of access to data can be tolerated until failure recovery actions
are completed.
Lenovo Storage S3200/S2200 Setup Guide
33

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S2200

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