Rorke Data Galaxy HDX2 GHDX2-2430S-24F4D - Manual (Page 24)

Chapter 1: Introduction
1-9
The dual-controller subsystem comes with a serial port Y-cable that allows you to
access a surviving controller in the event of controller failure without physically
changing the connection.
TIPS:
Connect both Ethernet ports (if you are using a dual-controller subsystem) to
the Ethernet ports of your network switch.
The Ethernet port on a non-dominant (secondary) controller will stay idle until
the occurrence of primary controller failure.
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Ethernet port: A single 10/100BaseT Ethernet port is used for local/remote
management over LAN/WAN. For a dual-controller configuration, connect the
Ethernet ports on both RAID controllers to your local network. The Ethernet port on
a non-dominant (stand-by, usually the controller in the lower slot) controller will
remain idle until a dominant, primary controller fails and the management service is
transferred to the surviving controller.
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Disk Drive Channels: All models come with twenty-four (24) SATA drive channels
that are interfaced thorough a backplane to the hard disk drives.
1.2.5 DIMM Module
Each controller module comes with a preinstalled 512MB DDR RAM DIMM module
mounted on the controller board within a metal chassis. The controller module supports
memory modules with sizes from 512MB to 2GB.
1.2.6 BBU Module
The BBU can sustain cached data for days during a power failure. If power outage
occurs, the BBU supplies power to sustain the unfinished writes in cache memory.