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HP/Convex SPP2000 (S-Class/X-Class) Internals

2. Eight Data Mover/Agents attach to the crossbar and provide access for the processors (Runway

buses) and I/O controllers (I/O channels) to the memory via the crossbar over a 1.9GB/s dat-

apath (four 32-bit, unidirectional buses from two ports on the Agent connect to two crossbar

ports). The I/O channels on the agent have a maximum bandwidth of 240MB/s. Each Agent has

two Runway processors buses (64-bit, bidirectional) which have an aggregate raw bandwidth of

960MB/s.

3. Eight PCI controller connect the 240MB/s I/O channels/PCI buses to the Agents.

4. Eight Memory controllers attach each one four-way interleaved memory board to the Hyperplane

crossbar. Each Memory controller has a bandwidth of 1.9GB/s. The memory controllers probably

also interface with the CTI interconnection.

Buses

 Total crossbar bandwidth 15.3GB/s (intra-crossbar)

 CPU bandwidth 7.5GB/s (CPU-to-Agent, eight Runway 960MB/s buses)

 Memory bandwidth 15GB/s (memory-to-crossbar, sixteen 960MB/s links)

 I/O bandwidth 1.9GB/s (eight 240MB/s channels, I/O channel-to-Agent)

 Eight PCI-32 I/O buses for expansion slots (each 240MB/s)

 Attachments to SCI rings/CTI ( “Coherent Toroidal Interconnect” ) via two rings (X-ring and Y-

ring), Node-to-Node bandwidth of 3.84GB/s, the rings operate at a clock of 120MHz with a

width of 32 bit

 SCSI-2 Ultra main storage I/O bus

Memory

 SDRAM DIMMs

 Two to eight memory boards per node

 Memory is up to four-way interleaved per memory board and up to 32-way interleaved per node

 SPP2000 Node/S-Class: 1GB minimum, 16GB maximum

 SPP2000 Wall/X-Class: 512GB maximum (with 32 nodes)

Expansion

 24 PCI 32-bit slots on eight PCI 32-bit channels

Drives

 20 internal Ultra SCSI drives

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