User`s guide

18 007-4522-003

1: Storage System Overview

Figure 1-12 Dual-port RAID Loopback LRC I/O Module

JBOD LRC I/O Module

The JBOD LRC/IO module uses a Fibre Channel arbitrated loop (FC-AL) to interface

with the host computer system. The FC-AL backplane incorporates two independent

loops formed by port bypass circuits within the LRC I/O modules. Processors housed on

the LRC modules provide enclosure management and interface to devices on the

backplane, PSU/cooling module, and ops panel, to monitor internal functions. These

processors operate in a master/slave configuration to allow failover.

Note: The JBOD LRC I/O module can address up to 96 disk drives; thus, six JBOD

enclosures can be cabled together.

The enclosure may be configured with either one or two LRC I/O modules. If only one

module is installed, an I/O blank module must be installed in the unused bay.

Host 0Host 1

Expansion

RS 232

Fault

2 Gb

NO RAID INSTALLED