User guide

Enclosure User Guide
12
1.4.5 Disk I/O Module
FC60SS-XPN storage expansion subsystems include an enclosure with rear facing bays which
house two Disk I/O modules, shown in
Figure 1–14.
The plug-in Disk I/O modules have been designed for integration into FC60SS-XPN storage
subsystems, utilizing SAS interconnections with the host computer system.
Processors housed on the Disk I/O modules provide enclosure management and interface to devices on
the Backplane, PSU, Disk I/O module and Ops Panel, to monitor internal functions. These processors
operate in a master slave configuration to allow failover.
The enclosure may be configured with either 1 or 2 modules. If only 1 Disk I/O module is fitted a blank
module should be fitted in the unused bay.The module incorporates LED indicators, shown in
Table 1–4:
Table 1–4 Disk I/O Module LEDs
LED Functions State Description
Host 0 & Host 1
(Green)
ON
Flashing
OFF
Ready
Active
Not Ready
Expansion
(Green)
ON
Flashing
OFF
Ready
Active
Not Ready
Figure 1–14 Disk I/O Module