Host Connection; Fibre Channel Host Connection; 10Gbe Iscsi Host Connection; 1Gb Iscsi Host Connection - Lenovo ThinkSystem DS Series Hardware Installation And Maintenance Manual

Host connection

DS6200/DS4200 controller enclosures support up to eight direct-connect server connections, four per controller
module. DS2200 controller enclosures support up to four server connections, two per controller module. Connect
appropriate cables from the server's HBAs to the controller module's host ports as described below, and shown in
the following illustrations.

Fibre Channel host connection

To connect controller modules supporting (4/8/16Gb) FC host interface ports to a server HBA or switch, using the
controller's CNC ports, select a qualified FC SFP option.
Qualified options support cable lengths of 1 m (3.28'), 2 m (6.56'), 5 m (16.40'), 15 m (49.21'), 30 m (98.43'), and
50 m (164.04') for OM4 multimode optical cables and OM3 multimode FC cables, respectively. A 0.5 m (1.64')
cable length is also supported for OM3. In addition to providing host connection, these cables are used for
connecting two storage systems via a switch, to facilitate use of the optional replication feature.

10GbE iSCSI host connection

To connect controller modules supporting 10GbE iSCSI host interface ports to a server HBA or switch, using the
controller's CNC ports, select a qualified 10GbE SFP option.
Qualified options support cable lengths of 0.5 m (1.64'), 1 m (3.28'), 3 m (9.84'), 5 m (16.40'), and 7 m (22.97') for
copper cables; and cable lengths of 0.65 m (2.13'), 1 m (3.28'), 1.2 m (3.94'), 3 m (9.84'), 5 m (16.40'), and 7 m
(22.97') for direct attach copper (DAC) cables. In addition to providing host connection, these cables are used for
connecting two storage systems via a switch, to facilitate use of the optional replication feature.

1Gb iSCSI host connection

To connect controller modules supporting 1Gb iSCSI host interface ports to a server HBA or switch, using the
controller's CNC ports, select a qualified 1Gb RJ-45 copper SFP option supporting (CAT5-E minimum) Ethernet
cables of the same lengths specified for 10GbE iSCSI above. In addition to providing host connection, these cables
are used for connecting two storage systems via a switch, to facilitate use of the optional replication feature.

HD mini-SAS host connection

To connect controller modules supporting HD mini-SAS host interface ports to a server HBA, using the controller's
SFF-8644 dual HD mini-SAS host ports, select a qualified HD mini-SAS cable option.
A qualified SFF-8644 to SFF-8644 cable option is used for connecting to a 12Gb/s enabled host; whereas a
qualified SFF-8644 to SFF-8088 cable option is used for connecting to a 6Gb/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').
Dual-controller configurations
Direct attach
A dual-controller configuration improves application availability because in the event of a controller failure, the
affected controller fails over to the partner controller with little interruption to data flow. A failed controller can be
replaced without the need to shut down the storage system. The DS Series enclosures are configured with dual
controller modules.
76 Installation