Cnc Technology - Lenovo ThinkSystem DS Series Hardware Installation And Maintenance Manual

ULP can show all LUNs through all host ports on both controllers, and the interconnect information is managed by
the controller firmware. ULP appears to the host as an active-active storage system, allowing the host to select any
available path to access the LUN, regardless of disk group ownership.
TIP: See the topic about configuring system settings in the Storage Management Guide to initially configure the
system or change system configuration settings (such as configuring host ports).

CNC technology

The DS Series FC/iSCSI models use Converged Network Controller (CNC) technology, allowing you to select the
desired host interface protocol(s) from the available FC or iSCSI host interface protocols 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
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
IMPORTANT: Use the set host-port-mode CLI command to set the host interface protocol for CNC ports
using qualified SFP options. DS Series models ship with CNC ports configured for FC. When connecting CNC
ports to iSCSI hosts, you must use the CLI (not the SMC) to specify which ports will use iSCSI. It is best to do this
before inserting the iSCSI SFPs into the CNC ports (see
Fibre Channel protocol
DS Series FC controller enclosures support two controller modules using the Fibre Channel interface protocol for
host connection. Each DS6200/DS4200 FC controller module provides four host ports, whereas each DS2200 FC
controller module provides two host ports. CNC ports are designed for use with an FC SFP supporting data rates up
to 16Gb/s.
The controllers support Fibre Channel Arbitrated Loop (public or private) or point-to-point topologies. Loop
protocol can be used in a physical loop or for 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 16Gb/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 for attachment to FC hosts directly, or through a switch used for the FC traffic. The host computer
must support FC and optionally, multipath I/O.
The Fibre Channel ports are used in either of two capacities:
• To connect two storage systems through a switch for use of replication.
• For attachment to FC hosts directly, or through a switch used for the FC traffic.
TIP: Use the SMC to set FC port speed. Within the Storage Manager Guide, see the topic about 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
DS Series 10GbE iSCSI controller enclosures support two controller modules using the Internet SCSI interface
protocol for host connection. Each DS6200/DS4200 10GbE iSCSI controller module provides four host ports,
"CNC ports used for host connection" (page 13)
"Change the CNC port mode" (page 86)
for more information concerning
"Install an SFP transceiver" (page
for instructions).
Connecting the enclosure to hosts
156).
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