User`s guide

Overview
007-4834-001 15
Overview
Important: Several references are made in this chapter to the storage management
software (TPSSM). For complete information on the operation and use of this software,
see the SGI InfiniteStorage TPSSM Software Concepts Guide (007-4749-00x).
Figure 2-2 shows a front view of the storage enclosure. The front of the enclosure
contains the following components:
• Front bezel: The bezel is a removable decorative cover with holes for viewing the
status LEDs and openings for the drive bays.
• Disk drives: Up to 16 sled-mounted drives can be installed in the bays on the front
of the enclosure.
• LEDs: There are three LEDs for each of the (up to) 16 drives that indicate the status
of the drive: the (green) drive active LED, the (amber) service action required LED,
and the (blue) service action allowed LED. There are also three LEDs that indicate
the overall status of the enclosure: the (amber) service action required LED, the
(green) power LED, and the (blue/white) locate LED.
• Alarm mute button: This button silences the audible alarm of the controller
enclosure. The expansion enclosure alarm button is not used. The storage array has
been programmed through the global NVSRAM to only sound the alarm on the
RAID controller enclosure.
Note: Controller enclosures and expansion controllers look identical when viewed from
the front.
The rear of each enclosure may contain the following components:
• RAID controllers: Controller enclosures contain two 3992/3994 RAID controllers.
• Environmental status modules (ESMs): Expansion enclosures have two ESM
modules in place of the RAID controllers.
• Link rate/ enclosure ID switches: These switches indicate the connection speed and
set the ID number of the enclosure.
• Power supply/fan modules: Two fan/power supply modules provide redundant
power and cooling for the enclosure.