Host Ports; Expansion Ports; Ethernet Management Ports; Dcs3700 Connectors - IBM System Storage DCS3700 Installation, User's, And Maintenance Manual

Figure 5. DCS3700 connectors

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.
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IBM System Storage DCS3700: Installation, User, and Maintenance Guide