EonStor U16U Installation and Hardware Reference Manual
1-8
Rear Panel Components
1.5. Rear Panel Components
1.5.1 The RAID Controller Module
The RAID controller module contains a main circuit board, necessary support interfaces
and an optional BBU. The controller module contains no user-serviceable components.
Except when replacing a faulty unit, installing a BBU or installing/upgrading the cache
memory inside the controller module should never be removed or opened.
WARNING:
Although the RAID Controller can be removed, the only time a user should touch the
controller itself is to replace the memory modules or to install the BBU. The RAID
controller is built of sensitive components and unnecessary tempering can damage the
controller.
1.5.1.1 Controller
Board
The heart of the ES U16U RAID controller subsystem is the IFT-3260 SCSI-
to-SCSI controller board. The IFT-3260 controller comes with two, pre-set
SCSI-320 host channels, CH0 and CH1, and two, preset SCSI-320 drive
channels, CH2 and CH3.
The IFT-3260 controller is mounted onto the base of the controller module
beneath the host IO board. The DIMM module is located on the controller
board and, when the DIMM module is changed, the controller module must
be disassembled and the host IO board removed from the controller board.
In the 6-channel model (ES U16U-G4010-6) the host IO board that is
mounted above the controller board has two extra pre-set, SCSI-320 drive
channels (CH4 and CH5) that are connected to external SCSI connectors for
expansion purposes.
Docking connectors at the rear of the controller board are used to connect the
controller module to the mid-plane board. Two board-to-board connectors for
a BBU charger board are also strategically placed in an easily accessible
location on the controller board.
1.5.1.2 DIMM
Modules
The ES subsystem is able to support SDRAM DIMM modules between
256MB and 1GB. It should be noted that all the controller models come with
either a 256MB or 512MB pre-installed DIMM module. The size of the
DIMM module selected depends on the model purchased. The DIMM
module is located on the controller board beneath the host IO board. See
Table 1-1
.
