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Chapter 4 Connecting Your Array
4-25
Figure 4-23 Typical SFP Connector Used to Connect Cables to Chassis SFP Ports
4.9
Establishing Communications With An Array
Before you can configure an array, you must establish one or more communication 
links between at least one host and an array. You can use any combination of the 
array’s RS-232 COM (serial) port, the Ethernet port, and the in-band data connection 
between the host and the array.
A direct RS-232 port connection guarantees that a host can communicate with a 
RAID array even if the array’s IP address changes or is unknown, or if the TCP/IP 
network suffers a temporary outage. See  “Configuring a Host COM Port to Connect 
to a RAID Array” on page 4-26 for more information.
SANnet II 200 FC, SATA, and SATA SE arrays ship with the Dynamic Host 
Configuration Protocol (DHCP) TCP/IP network support protocol enabled. If your 
network uses a DHCP server to dynamically and automatically allocate IP addresses 
to attached devices, as soon as the RAID array is powered up an IP address is 
assigned to it. You can use this IP address to monitor and manage the array’s 
firmware through telnet sessions. See  “Setting Up Out-of-Band Management Over 
Ethernet” on page 4-28 for info
rmation about setting up a telnet session.
A fixed IP address enables you to use telnet or other out-of-band management 
sessions to manage the array with no risk of a DHCP server changing its IP address. 
See  “Setting Up Out-of-Band Management Over Ethernet” on page 4-28 for 
information.
When the array is first powered up, the default IP address setting uses the IP address 
assigned by a DHCP server. If the RAID array is connected to a network with an active 
DHCP server, you can determine the IP address assigned to the array in several ways:
If you have access to the controller firmware, from the Main Menu choose 
Configuration Parameters 
 Communication Parameters  Internet Protocol 
(TCP/IP). If the RAID controller is not on a network connected to an active DHCP 
server, “DHCP Client” is displayed rather than a DHCP-assigned IP address. Refer 
to the “Configuration Parameters” chapter in the SANnet II Family RAID Firmware 
User's Guide
 for more information.