Quite true. However, in the case of FCoE, given the performance issues with the Fibre Channel SANs I worked on a few years ago, tail latency in the fabric was

Quite true. However, in the case of FCoE, given the performance issues with the Fibre Channel SANs I worked on a few years ago, tail latency in the fabric was the least of the concerns we ran into. Customers would wonder why their persistent messaging rates tanked when the system started pushing messages to disk. Meanwhile their SAN can't even sustain 100MB/s of sequential writes.