Chapter 11. D-brick2 Storage Module

This chapter describes the functional and physical components of the D-brick2 non-RAID mass storage option brick. It also explains how to power the D-brick2 on and off, and how to replace disk drive modules in the D-brick2. For troubleshooting and additional detailed information on the D-brick2, see SGI Total Performance 9100 (2Gb TP9100) Storage System User's Guide (P/N 007-4522-00x), which is available online at

Note: If you require RAID storage, ask your SGI sales representative about SGI RAID storage products, such as the SGI TP9400 and SGI TP9500 or TP9500S.

This chapter is divided into the following five major sections:

For instructions on removing or replacing the drive carrier modules, see “Installing or Replacing a D-brick2 Drive Carrier Module” in Chapter 12.

D-brick2 Overview

The optional D-brick2 module is a high performance, large-scale non-RAID storage system for your SGI rackmounted system. Each enclosure contains a minimum of 2 and maximum of 16 disk drives, and the component modules that handle I/O, power and cooling, and operations. Optional RAID storage systems are available for your system through your SGI sales representative. Figure 11-1 shows front and rear views of the D-brick2.

Figure 11-1. D-brick2 Front and Rear Views

D-brick2 Front and Rear Views

Functional Description

The modular design of the D-brick2 expands easily to meet your mass storage needs. This storage system provides compact, high-capacity JBOD ("just a bunch of disks") storage for supported SGI systems. Each D-brick2 is connected to one or more Fibre Channel boards (host bus adapters, or HBAs) in the SGI host system, either separately or in a combination (loop).

D-brick2 Features

The optional D-brick2 storage system has the following features:

  • Maximum configuration of up to 96 drives (six D-brick2 units)

  • 1x16 (more storage) and 2x8 (more bandwidth) disk topologies in each brick

  • Dual power feeds with dual power supplies

  • Redundant cooling

  • Non-disruptive component replacement

  • Enclosure services interface (ESI) for SCSI enclosure services (SES)

D-brick2 External Components

This section discusses the external D-brick2 components that you can access, add, replace, or upgrade. These include the following:

  • Drive carrier modules

  • Dummy” drive modules

  • Power supply and cooling modules

  • Operator's panel

  • Loop resiliency circuit (LRC) I/O modules

The first two items are accessed at the front of the module; the last three items are located in the rear of the D-brick2 unit.

Drive Carrier Modules and “Dummy” Modules

The disk drive carrier module consists of a hard disk drive mounted in a die-cast aluminum carrier (see Figure 11-2). The carrier protects the disk drive from radio frequency interference, electromagnetic induction, and physical damage. It also provides a means for thermal conduction.

Dummy drive carrier modules must be installed in all unused drive bays. They are designed as integral drive module front caps with handles and must be fitted to all unused drive bays to maintain a balanced airflow. Figure 11-2 shows examples.

Figure 11-2. D-brick2 Drive Carrier Module and “Dummy” Module

D-brick2 Drive Carrier Module and “Dummy” Module

A key (Torx screwdriver) to lock or unlock the disk drives is provided with each D–brick2. A red indicator is visible in the center rectangular aperture in the handle if the anti-tamper lock is locked, and a black indicator is visible when the lock is unlocked (see Figure 11-3).

Figure 11-3. Anti-Tamper Locking on the D-brick2 Disk Drive

Anti-Tamper Locking on the D-brick2 Disk Drive

Power Supply/Cooling Modules

Two power supply/cooling modules (PSUs) are mounted in the rear of the D-brick2. These modules supply redundant cooling and power to the enclosure and are auto-ranging. The supplies should be plugged into your SGI rack's power distribution strip (PDS). Four LEDs mounted on the rear panel of the D-brick2's PSU/cooling module indicate the status of the power supply and the fans (see Figure 11-4).

Note: If a power supply fails, do not remove it from the enclosure until you have a replacement power supply. The cooling fans in the supply will continue to operate.

Caution: You must finish replacing a PSU/cooling module within 10 minutes after removing one. Otherwise, thermal overload of the D-brick2 can result.

Figure 11-4. D-brick2 Operators Panel and Power Supply/Cooling Modules

D-brick2 Operators Panel and Power Supply/Cooling Modules

Operator's Panel

The operators panel (“ops panel”) contains an enclosure services processor that monitors and controls D-brick2 functions. The ops panel contains LEDs 9 show the status of all modules, an audible alarm that indicates a fault state is present, a push-button alarm mute switch, and a thumbwheel enclosure ID address range selector switch. When the D-brick2 is powered on, the audible alarm sounds for one second, and the power-on LED illuminates.

Figure 11-4 identifies all controls and indicators on the ops panel. Note that the operator's panel configuration switches slide left for “on” and right for “off.” For detailed descriptions of the LEDs and configuration switch information, see Chapter 5 in the SGI Total Performance 9100 (2Gb TP9100) Storage System User's Guide (P/N 007-4522-00x).

Loop Resiliency Circuit (LRC) Modules

The D-brick2 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. Figure 11-5 shows an LRC module.

Processors housed on the LRC modules provide enclosure management and interface to devices on the backplane, a PSU/cooling module, and an ops panel to monitor internal functions. These processors operate in a master/slave configuration to allow failover. See the SGI Total Performance 9100 (2Gb TP9100) Storage System User's Guide (P/N 007-4522-00x) for details.

Note: The JBOD LRC I/O module can address up to 96 disk drives; a maximum of six 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.

Figure 11-5. D-brick2 Loop Resiliency Circuit (LRC) Module

D-brick2 Loop Resiliency Circuit (LRC) Module

Powering the D-brick2 On or Off

This section explains how to power the D-brick2 on and off.

Powering On the D-brick2

Before powering on the D-brick2, confirm that the following is true:

  • Drives are seated in the correct bays and blank plates are fitted in any empty bays.

  • Ambient temperature is within the specified range of 10 ˚C to 40 ˚C (50 ˚F to 104 ˚F).

  • The system power distribution unit (PDU) and power distribution strip (PDS) are on.

To power on the D-brick2, follow these steps:

  1. Connect an AC power cord to each PSU/cooling module.

  2. Connect the AC power cords to the system PDS.

  3. Turn the power switch on each PSU/cooling module to the “on” position (I = on,
    O = off). See Figure 11-4 for switch locations.

The green “PSU good” LED illuminates. Also, the “power on” LED on the ESI/ops panel (see Figure 11-4) of each module turns green when AC power is present.

If the “power on” LED on the ESI/ops panel does not illuminate, or if the amber “system/ESI fault” LED illuminates, verify that you followed all steps. For troubleshooting tips, see the SGI Total Performance 9100 (2Gb TP9100) Storage System User's Guide or contact your service provider.

Powering Off the D-brick2

Before powering off the D-brick2, confirm that the following has occurred:

  • All system users have been notified and are logged off.

  • Disk data has been backed up as appropriate.

To power off a D-brick2 enclosure, follow these steps:

  1. Move the power switch on the rear of each PSU/cooling module to the “off” position (position I = on, O = off). See Figure 11-4 for switch locations.

  2. Unplug the power cable from the PSU/cooling module(s) as appropriate. For example, you would follow this step if you are replacing an individual module.

  3. If you are shutting down multiple bricks in the system, you may want to switch the PDS or PDU breaker switch to the “off” position.

The LEDs on the back of the unit should turn dark a few seconds after you power off the PSU/cooling module.

D-brick2 Technical and Environmental Specifications

The rackmounted D-brick2 disk enclosure is 13.4 cm (5.3 in.) high, 50 cm (19.7 in.) deep, and 44.6 cm (17.5 in.) wide. Component weights, power requirements, and environmental information for the D-brick2 are provided in the following tables.

Note: You should always follow system-level technical, operational, and environmental specifications, regardless of the tolerances of individual system bricks.

Table 11-1 shows the weight s of the brick and the various D-brick2 components.

Table 11-1. D-brick2 Weight Information



D-brick2 enclosure, fully populated

32.3 kg (71 lb)

D-brick2 enclosure, empty

17.9 kg (39.4 lb)

Power supply/cooling module

3.6 kg (7.9 lb)

Disk carrier module with drive

0.88 kg (1.9 lb)

LRC I/O module

1.2 kg (2.6 lb)

Table 11-2 shows the power requirements and specifications of the D-brick2.]

Table 11-2. D-brick2 Enclosure Power Specifications



Voltage range for rack

200-240 VAC

Voltage range selection



50-60 Hz

Power factor


Maximum power consumption

700 VA

Typical power consumption

400 VA or less

Inrush current (25 C [77 F] cold-start 1 PSU)

100 A maximum peak for 4 ms, 25 A thereafter at maximum voltage


Meets EN61000-3-2

Power cord:
Cord type



SV or SVT, 18 WG minimum, 3 conductor

250 V, 10 A

IEC 320 C-14, 250 V, 15 A

Table 11-3 provides temperature and humidity requirements for D-brick2 modules.]

Table 11-3. D-brick2 Ambient Temperature and Humidity Requirements



Relative Humidity

Maximum Wet Bulb

Operating temperature

5 C to 40 C
(41 F to 104 F)

20% to 80% noncondensing

23 C
(73 F)

Non-operating temperature

0 C to 50 C
(32 F to 122 F)

8% to 80% noncondensing

27 C
(80 F)

Storage temperature

1 C to 60 C
(34 F to 140 F)

8% to 80% noncondensing

29 C
(84 F)

Shipping temperature

-40 C to +60 C
(-40 F to 140 F)

5% to 100% nonprecipitating

29 C
(84 F)

Table 11-4 provides additional environmental specifications for D-brick2 units.

Table 11-4. Additional Environmental Requirements for D-brick2

Environmental Factor


Altitude, operating

0 to 3047 m (0 to 10,000 ft)

Altitude, non-operating

-305 to 12,192 m (-1000 to 40,000 ft)

Shock, operating

Vertical axis 5 g peak 1/2 sine, 10 ms

Shock, non-operating

30 g 10 ms 1/2 sine

Vibration, operating

0.21 grms 5-500 Hz random

Vibration, non-operating

1.04 grms 2-200 Hz random


Less than 6.0 B LwA operating at 20 C

Safety and approvals



EN55022 (CISPR22-A), EN55024 (CISPR24), FCC-A