HP 489183-B21 - InfiniBand DDR Switch 매뉴얼 사용 - 페이지 9
{카테고리_이름} HP 489183-B21 - InfiniBand DDR Switch에 대한 매뉴얼 사용을 온라인으로 검색하거나 PDF를 다운로드하세요. HP 489183-B21 - InfiniBand DDR Switch 15 페이지. Hp blc 4x ddr infiniband gen 2 switch installation guide
HP 489183-B21 - InfiniBand DDR Switch에 대해서도 마찬가지입니다: 자주 묻는 질문 (4 페이지), 설치 매뉴얼 (22 페이지)
페이지 인쇄
The operating distances of InfiniBand interconnects are contingent upon the type of cabling (copper or
fiber optic), the connector, and the signal rate. The common connectors used in InfiniBand
interconnects today are CX4 and quad small-form-factor pluggable (QSFP) as shown in Figure 6.
Figure 6. InfiniBand connectors
CX4
QSFP
Fiber optic cable with CX4 connectors generally offers the greatest distance capability. The adoption
of 4X DDR products is widespread, and deployment of QDR systems is expected to increase.
Link operation
Each link can be divided (multiplexed) into a set of virtual lanes, similar to highway lanes (Figure 7).
Each virtual lane provides flow control and allows a pair of devices to communicate autonomously.
Typical implementations have each link accommodating eight lanes
1
; one lane is reserved for fabric
management and the other lanes for packet transport. The virtual lane design allows an InfiniBand
link to share bandwidth between various sources and targets simultaneously. For example, if a
10Gb/s link were divided into five virtual lanes, each lane would have a bandwidth of 2Gb/s. The
InfiniBand architecture defines a virtual lane mapping algorithm to ensure inter-operability between
end nodes that support different numbers of virtual lanes.
Figure 7. InfiniBand virtual lane operation
Sources
Targets
The IBTA specification defines a minimum of two and a maximum of 16 virtual lanes per link.
1
9