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HP V2500 & V2600 Clustering

Memory

 SDRAM DIMMs (88-bit or 80-bit)

 Two to eight memory boards

 Each memory board has 16 slots: four 4-slot “quadrants”

 Memory is up to 256-way interleaved

 1GB minimum

 32GB maximum

Expansion

 28 PCI 64-bit 33MHz slots on eight PCI 64-bit channels

Drives

 16 internal SCSI drives, exact type depending on installed SCSI adapter, but in any case most like

Wide SCSI (Ultra or Fast)

4.51.3 Clustering

Multiple V-Classes can be connected together to form a single large system resulting in a “SCA” (Scalable

Computing Architecture) system:

 Up two four V2500/V2600s can be clustered together to form a system with up to

– 128 processors

– 128GB of RAM

– 112 PCI slots

– 64 SCSI drives

 Clustered V-Classes are ccNUMA computers; they are not fully conformant to the PA-RISC 2.0

speciﬁcation.

 Multiple systems are connected via two CTI rings: these links attach via the STACs to the eight

memory controllers. A single system attaches to one or two other V2500/V2600 “cabinets” and

their respective crossbars with a node-to-note data rate of 3.8GB/s.

 The two rings are called X-ring and Y-ring.

 The links are implementation of the IEEE SCI standard taken over from Convex — Coherent

Toroidal Interconnect (earlier: Convex Toroidal Interconnect).

 Each node’s main memory is globally accessible from other nodes on the CTI network (that is,

local memory is globally shared).

 32-512MB of each system’s main memory is reserved for cache memory for the CTI network

(conﬁgured statically at boot time).

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HP B160L Manual do Utilizador Página 336