AcQuisition Technology Quad M-module Carrier i4000 Guide de l'utilisateur Page 30

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14 007-4522-003
1: Storage System Overview
Figure 1-8 PSU/Cooling Module Switches and LEDs
RAID LRC I/O Modules
The storage system enclosure includes two loop resiliency circuit (LRC) I/O modules
with optional integrated RAID controllers. There are two RAID LRC I/O modules
available: a dual-port version and a single-port version (see Figure 1-9 and Figure 1-10).
The enclosure is available with or without RAID LRC I/O modules. An enclosure with
one or two RAID LRC I/O modules is a RAID base enclosure. An added enclosure with
JBOD LRC I/O modules is called an expansion enclosure, which must be cabled to a
RAID LRC I/O enclosure. The base and expansion enclosures can be connected with the
copper SFP cables that are included with the expansion enclosure or with optical SFP
cables.
The FC-AL backplane in the enclosure incorporates two independent loops formed by
port bypass circuits within the RAID LRC I/O modules. The RAID LRC I/O modules
use FC-AL interfacing with the host computer system. Processors in the RAID LRC I/O
modules communicate with the enclosure services interface (ESI) to devices on the
backplane, PSU, LRC and ops panel, to monitor internal functions. These processors
operate in a master/slave configuration to allow failover
Power on/off switch
(I = on)
AC power input
PSU good LED
DC output fail LED
AC input fail LED
Fan fail LED
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