SGI Origin 300

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The SGI Origin 300 was released October 9, 2001 as a mid-range server for technical computing and media applications. An Origin 300 compute node consists of a 2U-high system that contains 2 or 4 64-bit MIPS microprocessors and up to 4GB of local memory.

SGI Origin 300 technical server.

An Origin 300 system consists of 1 to 8 servers or compute modules with between 2 and 32 processors and 512MB to 32GB of shared memory in a single rack or desktop stack using cache-coherent NUMA technology and appearing as a single system image.

System Architecture

Each 2U Origin 300 server uses an IP45 mainboard supporting the following components:

  • 2 or 4 MIPS Microprocessors (with independent secondary cache)
  • Four Dual inline memory module (DIMM) slots organized in banks of two
  • The Xbridge ASIC that interfaces between the Bedrock ASIC and PCI slots
  • The Bedrock hub carrying traffic between the processors, memory and I/O devices
  • EEPROM containing the system's Serial ID
  • L1 Controller
  • Five Voltage Regulation Modules
  • Two NUMAlink 3 LEDs and four CPU "hearbeat" LEDs
  • One NUMAlink "Link" port supporting 3.2 GB/s (bi-directional) for system expansion
  • One Crosstown2 XIO port supporting 1.6 GB/s (bi-directional)

Note that the Origin 300's IP45 mainboard is software-compatible with the IP35, and may be reported as such in hinv(1m), et cetera. See this page for more information.

One Origin 300 can be used as a stand-alone server. Two Origin 300 servers can be directly connected using a NUMAlink cable, yielding a system with up to 8 CPUs and 8GB of shared memory. Larger configurations are possible; see "Larger Configurations" below.

Processors overview

The Origin 300 was available with 2 or 4 64-bit R14000 processors per compute node in either 500MHz or 600MHz clock speeds.

Memory subsystem

Each Origin 300 server has from 512MB to 4GB of local memory, including both main memory and directory memory for cache coherence.

Local memory consists of two or four banks that are referred to as banks 0, 1, 2 and 3. The four banks are arranged as two DIMM pairs (0 and 1). Each pair of banks consists of two dual-inline memory modules (DIMMs) that contain double data rate synchronous dynamic random-access memory (DDR SDRAM).

Memory may be added or removed from the system in two DIMM increments only. Both DIMMs in any bank must be of the same density, however two banks may hold different density DIMMs.

SGI offered three memory kits for the Origin 300:

  • 512 MB kit with integrated directory memory
  • 1 GB kit with integrated directory memory
  • 2 GB kit with integrated directory memory

Pairs of the following DIMMS can be installed in the Origin 300 to achieve these configurations:

  • 128MB DIMM (need p/n)
  • 256MB DIMM 030-1018-00x
  • 512MB DIMM 030-1044-00x
  • 1GB DIMM 030-1060-00x

I/O subsystem

The Origin 300 contains an I/O-8 board assembly consisting of an I/O-8 mainboard, an I/O-8 daughterboard and a PCI riser card. The assembly provides I/O interface functions, the I/O connectors to the system backpanel, and the L1 controller functions.

The I/O-8 board assembly presents the following at the rear of a compute node:

  • One 68-pin VHDCI external SCSI connector
  • One 10BaseT/100BaseT auto-selecting Ethernet connector
  • One DB9 RS-232 L1 console connector
  • Two 4-pin USB ports
  • One 4-pin USB L1 port
  • Two RS-232 or RS-422 115.2 Kbaud-capable DB9 async ports with modem control
  • One real-time (RT) interrupt output port
  • One RT interrupt input port

The PCI riser board provides a connection to the I/O-8 assembly as well as two 66MHz/64-bit PCI slots.

The SCSI backplane also connects directly to the I/O-8 assembly and provides two Ultra3 SCSI hard disks operating at a peak transfer rate of 160MB/s.

Larger Configurations

Between 3 and 8 Origin 300 modules can be connected to a NUMAlink module, similar to the R-brick in Origin 3000 systems, that acts as a router between these and possibly other modules. (An R-brick can be used for this purpose in the absence of an Origin 300 NUMAlink module; see this entry)

An Origin 300 system can include the following modules in addition to Origin 300 servers:

  • An L2 Controller that coordinates the various modules, particularly during power-up/-down.
  • An L3 Controller, which is a Linux workstation acting as a management system and front-end to the entire Origin 300 system.
  • PCI Module (provides 6 or 12 PCI slots).
  • NUMAlink Module acting as a crossbar switch between up to 8 other modules.
  • A power module or power distribution unit (PDU - does not require a NUMAlink connection).

The Crosstown2 XIO port can be used to connect to an InfiniteReality graphics sub-system. When a graphics sub-system is present, such a system is referred to as an Onyx 300.

Power and Cooling

Each Origin 300 server uses a single, non-redundant WTX power supply operating at 110/220Vac and outputting a maximum of 460W.

Cooling is provided by three system cooling fans and two power supply fans in an N+1 configuration. The Origin 300 uses a "standard" front-to-back airflow pattern.

External Links