Chapter 2
Understanding Congestion in Fibre Channel Fabrics
Fibre Channel is the most common type of network for transporting SCSI and NVMe protocols for accessing remote block storage. It uses B2B flow control between directly connected devices to build a lossless network. When congestion occurs, it spreads to the traffic source, affecting many other devices that share the same network paths. In the Fibre Channel community, congestion spreading is commonly known as slow drain. However, in this book, we specifically use the term slow drain for a type of congestion that is caused by an end device with a processing rate slower than the rate at which frames are being delivered to it. Congestion may be caused by other reasons as well, such as overutilization ...
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