This chapter provides an overview of the Origin200 server, and includes the following sections:
The Origin200 server is a multiprocessor system that consists of one or two chassis, which are called modules. Each Origin200 system ships from Silicon Graphics in either a tower (free-standing) or rackmountable configuration.
The tower configuration provides extra cosmetic “skins” (side panels and top-cap) and feet. The rackmountable configuration does not have these cosmetic features and feet, but does provide a mounting shelf, mounting ears, a different front bezel, and two pairs of end-caps (for use in 19-inch and 21-inch equipment racks).
If you wish to change your system from a tower configuration to a rack mountable configuration, contact Silicon Graphics or your local support provider for information about obtaining a conversion kit (P-S-RM-KIT).
Figure 1-1 shows a two-module system in a tower configuration.
Figure 1-2 shows a rear view of a two-module Origin200 system.
The Origin200 server can be mounted in a 21-inch Silicon Graphics rack or a standard 19-inch rack. Figure 1-3 shows an example of a two-module system in a 19-inch rack.
Table 1-1 summarizes the general features of Origin200 systems:
Table 1-1. General Features of Origin200 Systems
For additional information about power requirements, see “Power Supply”. For environmental specifications, including operating and nonoperating conditions, see “Physical and Environmental Specifications”.
The Origin200 logic carrier is a sheet-metal tray that holds:
Together, the logic carrier sheet metal, the main system board, CPU daughter card, and the PCI backplane form a single, field-replaceable unit.
The logic carrier may be serviced only by Silicon Graphics trained personnel.
Figure 1-4 shows the complete logic carrier.
The main system board contains
two SCSI controllers for internal drives
Ethernet controller
two serial port interfaces (UARTs)
parallel port interface
three PCI expansion slots
four banks of two dual-inline memory module (DIMM) sockets (eight total DIMM sockets)
CrayLink Interconnect connector
External connectors for the serial, Ethernet, and parallel interfaces, and the CrayLink Interconnect are all mounted directly to the main system board. See Figure 1-5.
Figure 1-5 shows the main system board, the CPU daughter card, and points out the locations of various components.
The module system controller (MSC), located behind the front power switch and status LED, performs the following functions:
holds the system serial number on a device called the number in a can (NIC)
provides power on, power off, reset, and other low-level functions
displays system status information using a tricolor LED
Power-on, power-off, reset, and nonmaskable interrupts are performed by pressing buttons on the front panel. You can also perform these and other functions by issuing commands to the MSC via a terminal or modem connected to the AUX port at the rear of the system.
See “Front Panel Functions: Status LED, Power, Reset, NMI” in Chapter 4 for a description of the front panel.
See “Using the AUX Port and Module System Controller Commands” in Chapter 4 for a description of the commands that the MSC can accept.
There are three expansion slots available for peripheral component interconnect (PCI) bus cards. The slots provide PCI IDs 5, 6, and 7. See Figure 1-6.
Boards can be full-size, 32-bit or 64-bit. In addition to providing 5V, the PCI backplane also accommodates 3.3V PCI cards with a total of up to 30 watts of 3.3V power.
Figure 1-6 shows the location and slot numbers of the PCI backplane.
Each Origin200 module can have between 32 MB and 2 GB of memory, depending upon the type of dual in-line memory module (DIMM) that you install. DIMMs are installed in sockets that are grouped into two banks of four sockets each. Figure 1-7 shows the layout of the DIMM sockets on the main system board.
Note the following about installing DIMMs in an Origin200 module:
DIMM sockets are numbered, left to right in Figure 1-7: 1, 3, 5, 7, 8, 6, 4, 2.
All modules must have at least one DIMM pair installed in Bank 0.
DIMMs in each bank must be of the same type, but each bank may have a different type of DIMM.
Interleaving between banks and DIMMs is designed into the memory architecture; you cannot alter the interleaving factors. Maximum interleaving is achieved with a single bank.
The Origin200 server provides bays for two sizes of internal drive options: 5.25-inch drives and 3.5-inch drives.
The 5.25-inch drive bay can be used for two combinations of drive form-factor:
one full-height drive
two half-height drives or two 1-inch drives
The 5.25-inch drives are controlled by SCSI channel 1, and drive IDs are set by jumpers on the drives. Drives are mounted in a removable peripheral carrier, shown in Figure 1-8.
The 3.5-inch drive bay has room for six drives, mounted individually on sleds. The 3.5-inch drives are attached to SCSI channel 0.
Each sled attaches to the 3.5-inch SCSI midplane with SCA connectors. Drive IDs are set by the position of the drive in the drive bay, with ID 1 at the bottom of the drive bay and ID 6 at the top of the drive bay. Figure 1-9 shows a 3.5-inch drive, sled, and drive bay.
There are two SCSI channels in each Origin200 module. Table 1-2 lists the channels in each module and their characteristics.
Table 1-2. SCSI Channel Numbers and Characteristics
First Module | Second Module | Drives | Description |
|---|---|---|---|
0 | 2 | 3.5-inch | Fast-20 SCSI-II, 16-bit (wide), running at 20 MHz, and capable of transferring 40 MB per second |
1 | 3 | 5.25-inch | Fast SCSI-II, 8-bit (narrow), running at 10 MHz, and capable of transferring 10 MB per second |
 | Note: SCSI channels in a one-module system are fixed at 0 and 1. The master module in a two-module server also uses channels 0 and 1. However, the slave module channel numbers may vary depending upon the order in which they are detected the first time the system is powered on. Table 1-2 shows typical channel numbers for a second module in a two-module system. See “Determining the Devices Installed on Your Server” in Chapter 4 for an explanation of device detection and numbering. |
Each Origin200 module provides two serial ports capable of transferring data at speeds ranging from 50 baud to 460 Kbaud in RS-232 mode. The default serial port configuration is RS-232, but the serial ports can be opened programmatically in RS-422 mode.
The serial port connectors are DB9, male, and are designed to be IBM-compatible. Because of this, they do not use the same pinouts as prior Silicon Graphics DB9 serial ports. See Appendix A, “Connector Pinout Assignments” for a description of the serial port pin assignments.
Table 1-3 lists the serial ports and their correspondence to IRIX device files.
Table 1-3. IRIX Device Files for Serial Port Numbers
Module | Serial Port Number | IRIX Device File | IRIX Device File | IRIX Device File |
|---|---|---|---|---|
First | 1 (system console) | /dev/tty[c,d,f,m]1 | /dev/tty4[d,f,m]1 | /dev/ttymidi1 |
Second | 3 | /dev/tty[c,d,f,m]3 | /dev/tty4[d,f,m]3 | /dev/ttymidi3 |
Serial ports in a single-module system, and in the master module are fixed at 1 and 2, with port 1 being the system console. See “Determining the Devices Installed on Your Server” in Chapter 4 for an explanation of device detection and numbering.
The AUX port is a DIN-8 connector that provides access to the module system controller. See “Using the AUX Port and Module System Controller Commands” in Chapter 4. For a description of the pin assignments of the AUX port, see Appendix A, “Connector Pinout Assignments.”
The parallel port is a 36-pin, high-density connector that meets the IEEE-1284 specification. See Appendix A, “Connector Pinout Assignments” for a description of the pin assignments.
Each Origin200 module contains a single RJ-45 connector for 10-Base-T or 100-Base-TX Ethernet. The connector has two integral LEDs that provide basic status. Network speed is automatically negotiated. For a description of the pin assignments of the Ethernet port, see Appendix A, “Connector Pinout Assignments.”
| Note: Category 5 wiring is required for proper 100-Base-TX operation. |
The Origin200 server has two connectors for use with the external interrupt interface. This interface allows separate systems to send and receive interrupts over a dedicated wire for purposes of inter-system synchronization. Using this device, a user process may generate outgoing interrupts to other systems, or receive interrupts from other machines in a variety of ways.
The connectors are 1/8-inch (3.5 mm) stereo jacks: one jack to send interrupts and one jack to receive interrupts. For more information on using the external interrupt interface and specifics about the jacks, see the ei(7) reference page. The wiring and voltages of the jacks are also described in Appendix A, “Connector Pinout Assignments.”
Specifications of the Origin200 power supply are as follows:
Table 1-4. Origin200 Server Power Supply Specifications (per Module)
Specification | Value |
|---|---|
100 to 120 VAC, and 200 to 240 VAC, autoranging | |
805 watts (for a fully configured module) | |
Input amps | 8 amps at 100 VAC |
Input volt-amps | 800 VA |
Frequency | 47 Hz to 63 Hz |
Output volts | +5 VDC |
Power factor | Unity power-factor corrected (0.98) |
Efficiency | 60% |
 | Warning: When using an uninterruptable power supply (UPS) with an Origin200 server, be sure that the UPS can supply up to 140 A of inrush current. Each Origin200 module can draw up to 140 A of current briefly when you power it on, even though the sustained current drawn is only a fraction of that. Some UPS units cannot supply that much inrush current and will be damaged if you use them with an Origin200 server. In addition, there is the possibility of fire or other hazard if these UPS units are unable to supply sufficient current. |
Air flows through the Origin200 from the front of the system to the rear, and is drawn by three DC fans located just behind the internal drive bays. The maximum flow rate is
100 cfm (0.047 m3/sec). Figure 1-10 shows the direction of air flow through an Origin200 server.
Air is drawn through the system in the following way:
Fan 1, directly behind the 5.25-inch peripheral carrier, draws air from the front of the system through the 5.25-inch peripheral carrier.
Fans 2 and 3 draw air from a common plenum just behind the SCSI backplane. This in turn draws air from the front of the system through the 3.5-inch peripherals.
The lower pressure in the fan plenum behind the SCSI backplane also draws air from a duct located at the front of the system next to drive 1 to the rear of the PCI plenum, where it is channeled forward through the PCI plenum, cooling any PCI boards that are installed.
Figure 1-11 shows the locations and numbering of the fans.
 | Caution: Because of the way that air is drawn through the PCI plenum, make sure PCI blanking plates cover any unused PCI slots. |
Fan speeds adjust automatically depending upon the outside air temperature. A sensor inside the chassis monitors the temperature of the air being drawn into the system. Depending upon the air temperature and the number of fans working, the module system controller (MSC) operates the fans at one of two speeds: low or high. Table 1-5 describes the relationship of the air temperature to fan speed.
Table 1-5. Relationship of Air Temperature to Fan Speed in an Origin200 Server
Air Temperature | Action |
|---|---|
Less than 83.3° F (28.5° C) | Fans run at normal speed. |
83.3° F (28.5° C) to 104° F (40° C) | Fans run at high speed. |
You can check the fan speed using the module system controller via the AUX port. See “Using the AUX Port and Module System Controller Commands”.
If one of the three fans fails, the status LED displays solid amber. Also, the MSC automatically adjusts the speed of the remaining two fans, or shuts down the system if the temperature is too high. See Table 1-6.
Table 1-6. How Fan Speed Is Adjusted When One Fan Fails
Air Temperature | Action If One Fan Fails |
|---|---|
Less than 83.3° F (28.5° C) | Fans run at high speed. |
83.3° F (28.5° C) to 104° F (40° C) | System shuts down. |
You can use the MSC to determine which fan has failed. See “Using the AUX Port and Module System Controller Commands” in Chapter 4 for more information. For information about replacing fans, see Chapter 10, “Removing and Replacing Internal Components.”
Table 1-7 lists the various physical and environmental specifications of the Origin200 server.
Table 1-7. Origin200 Physical and Environmental Specifications
If you are installing a two-module system, both modules must be connected to the same, grounded power source (for example, to the same electrical service entrance or breaker box). See “Power Supply” for the amount of current each power supply draws.
Modules may be on separate circuits, but the circuits must be connected to the same power source and ground. See Figure 2-1 in the section “Providing Correct Electrical Grounding (Earthing)” for examples of correct and incorrect power and grounding configurations.