Host ports
The DCS3700 storage system supports 6Gbps SAS on the base controller. The controller also contains an
upgradable interface slot that can support an optional 6Gbps 2-port SAS host interface card or 8Gbps
4-port FC host interface card.
The controller host interface ports performs an automatic link speed negotiation when it is connected to a
host or a switch. The host ports can operate at the following speeds:
v 6 Gbps SAS host ports can operate at either 3 or 6 Gbps
v 8 Gbps FC host ports can operate at 2, 4 or 8 Gbps
The controller performs link speed negotiation during the following events:
v Start-of-day
v Detection of a link-up event following a previous link-down event
Expansion ports
Each controller has a single 6 Gbps x4 SAS expansion port that is used to connect expansion enclosures to
the storage system. The two SAS expansion ports (one on each controller) are used to form a redundant
drive channel.
Ethernet management ports
The Ethernet connections provide for out-of-band management of the controller. Each controller has two
RJ-45 Ethernet ports that support either 100Base-T or 1000Base-T connections.
One Ethernet port on each controller is used for daily management of the storage subsystem, while the
second port is reserved for service personnel or as a backup port in the event the primary port fails.
The default IP addresses for the Ethernet ports are as follows:
v Port 1 on controller A is 192.168.128.101
v Port 2 on controller A is 192.168.129.101
v Port 1 on controller B is 192.168.128.102
v Port 2 on controller B is 192.168.129.102
The subnet mask for all Ethernet ports is 255.255.255.0.
Figure 5. DCS3700 connectors
10 IBM System Storage DCS3700: Installation, User, and Maintenance Guide
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