Infiniband 10G gigabit Base-CX4 cables Form Factor Xenpak SFF-8470

InfiniBand is a switched fabric communications link used in high-performance computing and enterprise data centers. Its features include high throughput, low latency, quality of service and failover, and it is designed to be scalable. The InfiniBand architecture specification defines a connection between processor nodes and high performance I/O nodes such as storage devices. InfiniBand forms a superset of the Virtual Interface Architecture. Like Fibre Channel, PCI Express, Serial ATA, and many other modern interconnects, InfiniBand offers point-to-point bidirectional serial links intended for the connection of processors with high-speed peripherals such as disks. On top of the point to point capabilities, InfiniBand also offers multicast operations as well. It supports several signalling rates and, as with PCI Express, links can be bonded together for additional throughput. Signaling rate The SDR serial connection's signalling rate is 2.5 gigabit per second (Gbit/s) in each direction per connection. DDR is 5 Gbit/s and QDR is 10 Gbit/s. FDR is 14.0625 Gbit/s and EDR is 25.78125Gbit/s per lane. For SDR, DDR and QDR, links use 8B/10B encoding — every 10 bits sent carry 8bits of data — making the useful data transmission rate four-fifths the raw rate. Thus single, double, and quad data rates carry 2, 4, or 8 Gbit/s useful data, respectively. For FDR and EDR, links use 64B/66B encoding — every 66 bits sent carry 64bits of data. (Neither of these calculations take into account the additional physical layer overhead requirements for comma characters or protocol requirements such as StartOfFrame and EndOfFrame). 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 10 Gbit/s (SDR), 20 Gbit/s (DDR) or 40 Gbit/s (QDR) connection. Larger systems with 12X links are typically used for cluster and supercomputer interconnects and for inter-switch connections. Latency The single data rate switch chips have a latency of 200 nanoseconds, DDR switch chips have a latency of 140 nanoseconds and QDR switch chips have a latency of 100 nanoseconds. The end-to-end latency range ranges from 1.07 microseconds MPI latency (Mellanox ConnectX QDR HCAs) to 1.29 microseconds MPI latency (Qlogic InfiniPath HCAs) to 2.6 microseconds (Mellanox InfiniHost DDR III HCAs).[citation needed] As of 2009 various InfiniBand host channel adapters (HCA) exist in the market, each with different latency and bandwidth characteristics. InfiniBand also provides RDMA capabilities for low CPU overhead. The latency for RDMA operations is less than 1 microsecond (Mellanox ConnectX HCAs). Topology InfiniBand uses a switched fabric topology, as opposed to a hierarchical switched network like Ethernet. Most of the network topologies are Fat-Tree (Clos), mesh or 3D-Torus. Recent papers (ISCA'10) demonstrated butterfly topologies as well. As in the channel model used in most mainframe computers, all transmissions begin or end at a channel adapter. Each processor contains a host channel adapter (HCA) and each peripheral has a target channel adapter (TCA). These adapters can also exchange information for security or quality of service. [edit] Messages This Article is Referenced From Wikipedia, the free encyclopedia

Infiniband Cables on Sale!

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CX44EE8D-0.5M Infiniband 10G base-CX4 28 AWG Cable with ejector latches. Same Form Factor as the Xenpak SFF-8470 Length: 0.5 Meter CX44EE8D-0.5M	$89.99	Add to Cart
CX44EE8D-1M Infiniband 10G base-CX4 28 AWG Cable with ejector latches. Same Form Factor as the Xenpak SFF-8470 Length: 1 Meter CX44EE8D-1M	$99.99	Add to Cart
CX44EE8D-3M Infiniband 10G base-CX4 28 AWG Cable with ejector latches. Same Form Factor as the Xenpak SFF-8470 Length: 3 Meter CX44EE8D-3M	$129.99	Add to Cart
CX44EE8D-5M Infiniband 10G base-CX4 28 AWG Cable with ejector latches. Same Form Factor as the Xenpak SFF-8470 Length: 5 Meter CX44EE8D-5M	$149.99	Add to Cart
CX44EE6D-10M Infiniband 10G base-CX4 26 AWG Cable with ejector latches. Same Form Factor as the Xenpak SFF-8470 Length: 10 Meter CX44EE6D-10M	$205.00	Add to Cart
CX44EE4G-15M Infiniband 10G base-CX4 24 AWG Cable with ejector latches. Same Form Factor as the Xenpak SFF-8470 Length: 15 Meter CX44EE4G-15M	$399.99	Add to Cart