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[Computer Architecture] InfiniBandCSE/Computer Architecture 2015. 6. 12. 15:57InfiniBand
인피니밴드(InfiniBand)는 High-Performance Computing과 기업용 데이터 센터에서 사용되는 스위치 방식의 통신 연결 방식이다.
주요 특징으로는 높은 Through-put과 낮은 Latency ,높은 안정성 & 확장성을 들 수 있음
Computing Node와 Storage Device와 같은 고성능 I/O 장비간의 연결에 사용됨
-> processor 와 intelligent I/O Devices 간의 dataflow를 위한 구조
PCI를 대체하기위해 나옴
Capacity, Expandability, Flexibility 를 늘리기 위함
-> Reliability, Availability, Serviceability for Internet infrastructures
Remote storage, networking and connection between servers
- Attach servers, remote storage, network devices to central fabric of switches and links
- Both for PCB and "out of box" interconnect
Greater server density(removing I/O from the server chassis)
- Blade server
I/O distance from server up to(전송매체에 따라 상이함)
- 17m using copper, 300m multimode fibre optic, 10km single mode fibre
Up to 120 Gbps signalling rate (2.5*12*4)
- Data rate 2.5 G * 0.8(data 8B / 10B encoding) * 4(QDR) = 96Gb/sec (신호특성을 바꿔 에러줄임)
- Implementers can aggregate links in units of 4 or 12, called 4X or 12X
- A 12X QDR link therefore carries 120 Gbit/s raw, or 96 Gbit/s of useful data
- As of 2009 most systems use a 4X aggregate, implying a 10Gbit/s(SDR), 20Gbit/s(DDR) or 40Gbit/s(QDR) connection
- Larger systems with 12X links are typically used bfor cluster and supercomputer interconnects and for inter-switch connections
The end-toend latency range
- MPI latency : 1.07 - 1.29 microseconds MPI latency
- Provides RDMA(Remote node R/W via DMA) capabilities for low CPU overhead
InfiniBand Fabric: 연결이 여러가지 형태로 되어있음 => fail-over scalability
참고:
1) http://www.eetimes.com/document.asp?doc_id=1204375
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