SAN Fibre Channel over Ethernet FCoE

[Uinyer]

I am eager to know how communication takes place in FCoE network. I am knowing that for modern and flexible data centers turned out Fibre Channel over Ethernet (FCoE) more and more as a key technology. So provide some information about SAN Fibre Channel over Ethernet FCoE in details. I am expecting some help from your side as soon as possible (like you always do.. ). It would be helpful for me if you provide Fibre Channel and its requirements.

[Shutdown]

In simple terms, with FCoE a more homogeneous and thus more favorable network structure in to: Physically and technically separate storage and Local Area Networks (SANs and LANs) can be transported on common infrastructure to be a Sun The consequences are not only low-cost or better administration, but extend into the area of data center virtualization. With the help of the Protocol is in the SAN widespread Fibre Channel (FC) problem via a custom Ethernet -run structure. The goal is an input-output (I / O) consolidation. For this purpose, had the best for many years, Ethernet will be further developed to be used as a transport medium for the parameters with respect to certain highly sophisticated Fibre Channel. It was the Converged Enhanced Ethernet (CEE).

[Quattro]

To understand why the existing Ethernet must be further developed, it is helpful to know to get closer to Fibre Channel. FC was developed in the 1990s to the parallel transmission standard Small Computer System Interface (SCSI) to make network-capable. SCSI is a ubiquitous interface for peripheral components of all kind of high demands on the quality of data transmission. Go here lost data, they are typically not resent again, as is the case with TCP applications. Should it come in a SCSI cable but a loss of data, so all communication is terminated and all resent. Furthermore, it comes in a SCSI cable from hard to believe that individual frames can overtake each other, the extradition in the wrong order (out-of-order delivery) such as the Internet is not an issue. Similarly, SCSI was not suffering from the problem of delay, the delay, because the cable lengths were always rather short (eg three meters for Ultra SCSI, 1992). And variable delay or jitter did not occur.

[T0tal L0$$]

All of these properties, virtually no data loss, ultra-low delay, no jitter, in-order delivery, presented at the time - even today, by the way - high demands on the network. Ethernet and TCP / IP at that time were not suitable for this role, so a separate storage network protocol was developed. Since that time, FC SANs in the claims, and forms the backbone of the most demanding storage networks worldwide. FC but requires extra hardware, and that was never cheap. The network card does not mean network interface cards (NICs), but host bus adapters (HBAs). Relatively expensive FC switches connecting the HBAs to the server with the storage controller interfaces referred to the media, be it disk / RAID systems (Virtual) tapes or JBODs (Just a Bunch of Disks). The dedicated hardware, specialized applications and the high standards of safety and high availability data centers to make complex and expensive - to buy and to maintain. Specialized manufacturer with its own support structures as well as expensive specialists do the rest, that users think more than ever on standardization in this important IT sector.

[spuff]

CEE is an advanced, Ethernet -based (currently) 10-Gigabit Ethernet. It can be regarded as the standard of the future. Its new features have advantages that are essential not only for the transport of FC, but provide Ethernet to a higher stage of development, the benefit of all applications and protocols. In addition, CEE is built backwards compatible. But not all CEE components are standardized. CEE is often referred to as "lossless Ethernet". This designation is intended to illustrate a feature of the "better" grip Ethernet - its ability to prevent the loss of suitable flow control frames. Well, if you want to be accurate, then the losses can be in transit through a line of this world never be complete. The bottom line is that set out in the CEE, a number of measures leading to the fact that mechanisms must be built to guarantee a certain Quality of Service (QoS). This CEE is able to transport even the most demanding applications such as FC appropriate.