SGI Origin 300
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 chassis containing a sysem board with 2 or 4 64-bit MIPS microprocessors and up to 4GB of local memory, PCI expansion slots, and up to two hard drives. An Origin 300 system consists of 1 to 8 compute nodes with between 2 and 32 processors and 512MB to 32GB of shared memory using cache-coherent NUMA technology and appearing as a single system image.
The Onyx 300 Graphics System was created by combining Origin 300 compute nodes with an Infinite Reality graphics module and other NUMAlinked components.
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)
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.
The Origin 300 was available with 2 or 4 64-bit R14000 processors per compute node in either 500MHz or 600MHz clock speeds.
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
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.
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 12 PCI slots organized into 2 busses).
- 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).
Onyx 300 Graphics
The Onyx 300 was created by combining Origin 300 compute modules with InfiniteReality graphics systems connected to the XIO port on the compute module. The base configuration for an Onyx 300 was as follows:
- One or two Onyx 300 compute modules (2, 4, 6, or 8 processors)
- One InfiniteReality graphics module with one or two graphics pipes
- One L2 controller module
- One or more TP900 storage modules (optional)
- One PCI expansion module (optional)
- One power distribution unit (PDU)
- One power bay (required when a PCI expansion module is present)
Larger configurations are possible through the use of a NUMAlink module, just as with the Origin 300. The maximum standard configuration included 8 compute modules and 8 InfiniteReality modules with 8 graphics pipes.
Hard Drive Carriers
These drive carriers are standard off-the-shelf parts used by a number of high-volume server manufacturers, but were apparently only used by SGI on the Origin and Onyx 300 models.
Often Origin 300 systems will be split up and the individual bricks sold to different buyers. While many of these bricks never had hard drives installed, SGI did install drive carriers with baffles to maintain airflow. This is good news for buyers, as the plastic baffles can be removed and hard drives installed in their place.
The units typically have a sticker on the front of the carrier showing the identifier "Assy A06447-00x" where the "-00x" may end in any digit. The second line of the label includes what may be an additional part number ("203368", as seen in the thumbnail image to the right) and a manufacturing code of some kind. It is unclear whether the manufacturing code indicates time of production, plant, batch run, or something else entirely.
However the assembly number from SGI units has not always been useful when searching for replacement parts in the Internet. It was suggested that Intel part number 746797-001 may be the same OEM part. smj has since ordered a carrier with this part number from an auction site that was purported to come from a Gateway server, and it fits the O300 well.
The 746797-001 part number is referenced in some sources as being used on Intel's SR1200/2200 and ISP2150G servers (black bezel). However images from some eBay auctions appear more similar to the Origin 350-style drive sled, and indeed the Intel product guide for the SR1200 has diagrams showing a unit more similar to that used in the Origin 350.
As of mid-2011 one UK seller had the Intel 746797-001 carriers available on eBay for UK£10, and several US sellers offered Intel carriers purportedly with that part number for US$10. (smj purchased one for about $12 shipped within the US in early 2012.) A recent (1Q2012) online auction of "GATEWAY Hard Drive Blank Caddy 741202-001" had photos of drive carriers that looked identical to O300 carriers, so this may be an additional OEM part number to check for.
- Drive carrier with drive installed
- Drive carrier with baffle installed
- Drive carrier with baffle installed, top view
- Label molded into air baffle
Forum Threads About Origin 300 Drive Carriers
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.