60 Connecting hosts
Fibre Channel host connection
To connect 4824/4834/4844/4854 controller modules supporting (4/8/16 Gb) 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 a local storage system to a remote storage system via a
switch, to facilitate use of the optional AssuredRemote replication feature.
10GbE iSCSI host connection
To connect 4824/4834/4844/4854 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 a local storage system to a remote storage system via a
switch, to facilitate use of the optional AssuredRemote replication feature.
1 Gb iSCSI host connection
To connect 4824/4834/4844/4854 controller modules supporting 1Gb iSCSI host interface ports to a
server HBA or switch—using the controller’s CNC ports—select a qualified 1 Gb 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 a local storage system to a
remote storage system via a switch, to facilitate use of the optional AssuredRemote replication feature.
HD mini-SAS host connection
To connect 4524/4534/4544/4554 controller modules supporting HD mini-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. 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').
NOTE: Supported qualified cable options for host connection are subject to change.
NOTE: Keys to reading cabling diagrams for host connection:
• 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 interchangeable SFPs
supported by the system.
• Within each cabling connection category, the HD mini-SAS model is shown beneath the CNC model.
• In the cabling diagrams that follow, 2U enclosures are shown without a power switch, per 2U12/2U24
configuration.
• The PSUs used in 2U48 enclosures are equipped with a power switch (see Figure 107 on page 128).
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.
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