58 Connecting hosts
supported by the system. The small form-factor pluggable (SFP transceiver or SFP) connectors used in CNC
ports are further described in the subsections below. Also see CNC ports used for host connection on
page 11 for more information concerning use of CNC ports.
NOTE: Controller modules are not shipped with pre-installed SFPs. Within your product kit, you will need
to locate the qualified SFP options, and install them into the CNC ports. See Install an SFP transceiver on
page 141.
IMPORTANT: Use the set host-port-mode CLI command to set the host interface protocol for CNC
ports using qualified SFP options. AssuredSAN 4824/4834/4844/4854 models ship with CNC ports
configured for FC. When connecting CNC ports to iSCSI hosts, you must use the CLI (not the SMC or
RAIDar) to specify which ports will use iSCSI. It is best to do this before inserting the iSCSI SFPs into the
CNC ports (see Change the CNC port mode on page 78 for instructions).
NOTE: AssuredSAN 4824/4834/4844/4854 models support the optionally-licensed AssuredRemote
replication feature.
Whereas linear storage supports FC and iSCSI host interface protocols for replication,
virtual storage supports iSCSI host interface protocol for replication. Both linear and virtual storage support
all qualified CNC options for host connection.
Fibre Channel protocol
AssuredSAN 4824/4834/4844/4854 controller enclosures support controller modules using the Fibre
Channel interface protocol for host connection. Each controller module provides four host ports designed
for use with an FC SFP supporting data rates up to 16 Gbit/s. When configured with FC SFPs, these
controller enclosures can also be cabled to support the optionally-licensed AssuredRemote replication
feature (linear storage only) via the FC ports.
The controller supports Fibre Channel Arbitrated Loop (public or private) or point-to-point topologies. Loop
protocol can be used in a physical loop or in a direct connection between two devices. Point-to-point
protocol is used to connect to a fabric switch. Point-to-point protocol can also be used for direct connection,
and it is the only option supporting direct connection at 16 Gbit/s. See the set host-parameters
command within the CLI Reference Guide for command syntax and details about parameter settings
relative to supported link speeds.
Fibre Channel ports are used in either of two capacities:
• To connect two storage systems through a Fibre Channel switch for use of AssuredRemote replication
(linear storage only).
• For attachment to FC hosts directly, or through a switch used for the FC traffic.
The first usage option requires valid licensing for the AssuredRemote replication feature, whereas the
second option requires that the host computer supports FC and optionally, multipath I/O.
TIP: Use the SMC or RAIDar Configuration Wizard to set FC port speed. Within the Storage
Management Guide, see “Configuring host ports.” Use the set host-parameters CLI command to set
FC port options, and use the show ports CLI command to view information about host ports.
10GbE iSCSI protocol
AssuredSAN 4824/4834/4844/4854 controller enclosures support one or two controller modules using
the Internet SCSI interface protocol for host connection. Each controller module provides four host ports
designed for use with a 10GbE iSCSI SFP supporting data rates up to 10 Gbit/s, using either one-way or
mutual CHAP (Challenge-Handshake Authentication Protocol).
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