iSCSI - 1Gb/s in 2003, 10Gb/s in 2007 (basic 10GbE first appeared in.(FC-BB-5 was approved in June 2009, INCITS 462-2010 was approved in Spring 2010).In 2011 (FC is generally backward compatible with the previous two generations) Newer interface speeds are often available in switches and adapters long before they are available in storage devices and storage systems. Products became available with the interface speeds listed during these See the Connector Types section below for more details on the connector types. QSFP and QSFP+ connectors are used for 4x connections, and CXP connectors are typically used for 12x connections. InfiniBand connections can be aggregated into 4x (4 lanes) and 12x (12 lanes), depending on the applicationĪnd connector. Host Adapter requirements (dual-port cards) USB 3.1 (10 Gbps, see Roadmaps section below) See Roadmaps section below.ġGbE, FC (up to 8Gb), IB (SDR, DDR & QDR), PCIe (1.0 & 2.0) SAS, SATA, USB (up to 3.0)ġ0GbE, 100GbE, FC (10Gb & 16Gb), FCoE, IB (FDR & EDR) Information is provided in the PCI Express sectionbelow. PCIe version 3 uses 128b/130b encoding, resulting in a 1.5 percent overhead on the raw bit rate. PCIe versions 1.x and 2.x use 8b/10b encoding. The throughput of 8Gb Fibre Channel, which uses a line rate of 8.5 Gbps with the 8b/10b encoding scheme.Ħ4b/66b encoding results in a 3 percent overhead (66-64)/66 on the raw bit rate. 16Gb Fibre Channel uses a line rate of 14.025 Gbps, but with the 64b/66b encoding scheme results in a doubling of Implement it will be built so that they can work with the older encoding scheme. 64b/66b encoding is not directly compatible with 8b/10b, but the technologies that 64b/66b is the encoding scheme for 16Gb FC and is planned for higher data rates for IB. 8b/10b encoding results in a 20 percent overhead (10-8)/10 on the raw bit rate.īeginning with 10GbE and 10GbFC (for ISL’s), some of the newer speeds emerging in 2010 and beyond, a newer “64b/66b” encoding scheme is being used to improve data When converting from bits to bytes on the interface, dividing by ten (10) is exactly correct.
Many of these interfaces use “8b/10b” encoding which maps 8 bit bytes into 10 bit symbols for transmission on the wire, with the extra bits used for command and control Bytes and Encoding Schemes Transfer rates for storage interfaces and devices are generally listed as MB/sec or MBps (MegaBytes per second), which is generally calculated as Megabits per second The transfer rates listed are across a single port at half duplex.īits vs. Some interface adapters provide hardware offload to improve performance, manageability and/or reliability of the data transmission across the respective interface. Some interfaces may not be able to transfer data at the maximum possible transfer rate due to processing overhead Transfer rate of individual devices that may be connected to this interface. Transfer rate, sometimes known as transfer speed, is the maximum rate at which data can be transferred across the interface. PCIe data rates are provided in the PCI Express section below. Storage Networking Interface Comparison Table Storage throughput rates are generally measured in bytes per second. Network throughput rates are generally measured in bits per second. NIC - Network Interface Controller or Network Interface Card (used with FCoE,.HCA - Host Channel Adapter (used with IB).HBA - Host Bus Adapter (used with FC, iSCSI, SAS, SATA).CNA - Converged Network Adapter (used with FCoE).iSCSI - Internet Small Computer System Interface.Storage Networking Interface Comparison Table.