R/Evolution 2000 Series, Troubleshooting Manual

Page: 15 / 130

Chapter 1 System Architecture 15
Controller Modules
A controller module is a FRU that contains two connected circuit boards: a RAID
I/O module and a host interface module (HIM).
The RAID I/O module is a hot-pluggable board that mates with the enclosure
midplane and provides all RAID controller functions and SAS/SATA disk channels.
The HIM provides the host-side interface and contains dual-port, host target
channels for connection to host systems. The 2730 has a Fibre Channel HIM that
supports 2- or 4-Gbit/sec link speed. The 2330 has an iSCSI HIM that supports
1-Gbit/sec link speed. The 2530 has a SAS HIM that supports 4-lane 3-Gbps host
speeds.
The controller module contains three processing subsystems: the Storage Controller,
the Management Controller, and the Expander Controller.
Note – When a fault occurs in a controller module processor or a bus fault occurs
that is related to the controller module, the entire controller module FRU is
replaced.
Drive Expansion Module
Expansion module architecture is a simplified version of controller module
architecture. Like a controller module, an expansion module has an Expander
Controller and uses the SAS protocol. Each module has a SAS “In” port and a SAS
“Out” port, which enables up to four 2130s to be connected together, and to a host
system. When a fault occurs in the Expander Controller or a bus fault occurs that is
related to the expansion module, the entire module is replaced.
For information about supported configurations for connecting enclosures to each
other and to hosts, see the appropriate
getting started guide .
Power-and-Cooling Modules
Each enclosure contains two power-and-cooling modules. A power-and-cooling
module is a FRU that includes a power supply unit and two cooling fans. If a power
supply fault or fan fault occurs, the entire module is replaced.