This section provides channel bandwidth tables for each of the bricks to help you create a configuration that meets customer requirements for performance, capacity and connectivity. When you configure a system for performance, evaluate the sustained bandwidths of the compute nodes (C-bricks) and the I/O nodes (I-, P-, X-bricks) to determine the sustainable channel bandwidth.
Each C-brick consists of two or four MIPS R12000A processors running at 400 MHz, each with an 8-MB secondary cache. Each processor is capable of executing two floating-point instructions per cycle, which supports a peak speed of 800 MFLOPS. The peak and sustained bandwidths for each of the C-brick's channels are listed in Table 4-1. The memory is a distributed shared memory (DSM) scheme, in which the memory is physically partitioned among the nodes but is accessible by all nodes. Cache coherence is maintained through a directory-based scheme. Refer to “Compute Node (C-brick) ” in Chapter 3 for detailed information on the C-brick.
Table 4-1. Bandwidth Characteristics of the C-brick
Description | PEAK Bandwidth | Sustainable Bandwidth |
|---|---|---|
Link Channel Bandwidth | 3.2 GB/s full-duplex | ~ 1420 MB/s each direction |
Xtown2 Channel Bandwidth | 2.4 GB/s full-duplex | ~ 1066 MB/s half duplex |
Main Memory Bandwidth | 3200 MB/s | 3200 MB/s |
SYSAD Bandwidth (each SYSAD) | 1600 MB/s | ~ 1400 MB/s |
The D-brick supports a maximum of twelve 3.5-inch Fibre Channel (FC) disk drives. The twelve dual-ported disk drives connect to two Fibre Channel loops. The aggregate channel bandwidth of a Fibre Channel depends on the bandwidth capability of the FC controller and the number and type of FC disk drives on the channel. Refer to Table 4-7 for controller bandwidth values and to Table 4-2 for bandwidth values of individual drives.
Table 4-2. Bandwidth Characteristics of the D-brick
Description | PEAK Bandwidth |
|---|---|
18.2-GB FC Disk Drive (10K RPM) | (TBD) |
36.4-GB FC Disk Drive (10K RPM) | ~ 30 MB/s |
The I-brick is a Crosstalk-to-PCI based I/O subsystem. It has two 1200-MB/s Xtown2 ports that connect to C bricks. There are five PCI slots that are configured on two buses and two drive bays that support Fibre Channel disk drives. For more information about the I-brick refer to the “System Boot (I-brick) ” in Chapter 3. Refer to Table 4-3 for the peak and sustained bandwidth values.
Table 4-3. Bandwidth Characteristics of the I-brick
Description | Peak Bandwidth |
|---|---|
Xtown2 Ports A and B | 2 modes, software selectable |
PCI Bus 1 Slots 1 through 3 at 33 MHz | 128 MB/s in 32-bit mode |
PCI Bus 2 slots 1 and 2 at 66 MHz | 256 MB/s in 32-bit mode |
The P-brick has two 1200-MB/s Xtown2 ports that connect to C-bricks. There are 12 PCI slots that are configured on six buses. For more information about the P-brick, refer to the “PCI Expansion (P-brick)” in Chapter 3. Refer to Table 4-4 for the peak and sustained bandwidth values.
Table 4-4. Bandwidth Characteristics of the P-brick
Description | Peak Bandwidth |
|---|---|
Xtown2 Ports A and B | 2 modes software selectable |
PCI Bus 1-6 at 66MHz (two slots per bus) | 256 MB/s in 32-bit mode |
The X-brick provides four expansion slots for XIO interface cards, such as HIPPI, DVC, and GSN. For more information about the X-brick, refer to the “XIO Expansion (X-brick) ” in Chapter 3. Refer to Table 4-5 for the bandwidth values.
Table 4-5. Bandwidth Characteristics of the X-brick
Description | Peak Bandwidth |
|---|---|
Xtown2 Ports A and B | 2 modes, software selectable |
XIO Ports | 800 MB/s full-duplex |
The X-brick supports the XIO cards that are listed in Table 4-6 for First Customer Ship (FCS). Additional XIO cards will be added to this table as they qualify.
Table 4-6. Supported XIO Cards
Description | Bandwidth (Peak) | Max-per Brick | Max-per System |
|---|---|---|---|
Digital video XIO card | TBD | TBD | TBD |
Digital video I/O DVC Onyx2 | TBD | TBD | TBD |
XIO 1-port FDDI Dual Attach Station (DAS) | TBD | 6 | 6 |
GSN adapter single port XIO card copper | 800 MB/s | 2 | 2 |
GSN adapter two port XIO card copper | 1600 MB/s | 2 | 2 |
XIO high definition video I/O | TBD | TBD | TBD |
Single-port serial HIPPI XIO card | 100 MB/s | 4 | 4 |
XIO to VME adapter 6 U | TBD | 4 | 4 |
XIO to VME adapter 9 U | TBD | 4 | 4 |
Four-port ATM OC3 | 19 MB/s | 4 | 16 |
The PCI cards listed in Table 4-7 are supported in the I, P, and X-bricks for initial shipments. Additional PCI cards will be added to this table as they qualify.
Table 4-7. Supported PCI Cards
Description | PCI Bus | Bandwidth (Peak) (per port) |
|---|---|---|
SCSI |
|
|
Two-port Ultra SCSI high voltage differential | 33-MHz / 64-bit | 40 MB/s (wide) |
Two-port Ultra2 SCSI low voltage differential | 33-MHz / 64-bit | 80 MB/s (wide) |
Fibre Channel |
|
|
Single-port 1-Gb Fiber Channel with fibre optic cable | 66-MHz / 64-bit | 100 MB/s |
Single-port 1-Gb Fibre Channel with copper cable | 66-MHz / 64-bit | 100 MB/s |
Networking |
|
|
Single-port gigabit Ethernet Fiber optic | 66-MHz / 64-bit | 125 MB/s |
Single-port gigabit Ethernet card | 66-MHz / 64-bit | 125 MB/s |
Single-port ATM OC3 | 33-MHz/ 64-bit | 19.3 MB/s |
Single-port ATM OC12 | 66-MHz / 64-bit | 78 MB/s |
Miscellaneous |
|
|
8-channel digital audio | 33-MHz / 32-bit | 2.88 MB/s |
Multi-port RS-232 Serial Port Card | 33-MHz / 32-bit | .0143 MB/s |
Table 4-8. PCI Controller brick and System Maximum Quantities
Description | PCI Bus | Maximum Cards per Brick | Maximum Cards per System |
|---|---|---|---|
SCSI |
|
|
|
Two-port Ultra SCSI high voltage differential | 33-MHz / 64-bit | I-brick - 2 per bus (04 total) | 24 |
Two-port Ultra2 SCSI low voltage differential | 33-MHz / 64-bit | I-brick - 2 per bus (04 total) | 12 |
Fibre Channel |
|
|
|
Single-port 1-Gb Fiber Channel with fibre optic cable | 66-MHz / 64-bit | I-brick - 2 per bus (04 total) | 24 |
Single-port 1-Gb Fibre Channel with copper cable | 66-MHz / 64-bit | I-brick - 2 per bus (04 total) | 24 |
Networking |
|
|
|
Single-port gigabit Ethernet Fiber optic | 66-MHz / 64-bit | I-brick - 2 on bus 2 (02 total) | 20 |
Single-port gigabit Ethernet card 10/100/1000BaseT Unshielded Twisted Pair | 66-MHz / 64-bit | I-brick - 2 on bus 2 (02 total) | 20 |
Single-port ATM OC3 | 33-MHz/ 32-bit | I-brick - 2 on bus 2 (02 total) | 8 |
Single-port ATM OC12 | 66-MHz / 64-bit | I-brick - 1 on bus 2 (01 total) | 8 |
Miscellaneous |
|
|
|
8-channel digital audio | 33-MHz / 32-bit | 6 | 6 |
Multi-port Serial Port Card | TBD | TBD | TBD |
The tape drives listed in Table 4-9 are available for SGI Origin 3000 series systems.
Table 4-9. Supported Tape Drive Subsystems
Peripheral Product Designator | Interface Type | Storage Capacity (Mbytes) | Transfer Rate (MBytes) |
|---|---|---|---|
DLT 7000 | SCSI only | 35,000 | 5.0 |
FUJITSU M2483/M2485/M2488 | SCSI only | 24,000 | 3.0 |
IBM 3480/3490/3490E | SCSI only | 800 | 4.5 |
IBM 3590 Magstar | SCSI only | 20,000 | 9.0 |
STK 9840 | SCSI and FC | 20,000 | 9.0 |
STK 4480 (18 track) | SCSI only | 200 | 3.0 |
STK 4490 Silverton (36 track) | SCSI only | 800 | 3.0 |
STK 9490 Timberline (36 track) | SCSI only | 800 | 6.0 |
SONY AIT-2 | SCSI only | 60,000 | 6.0 |