For the hot-standby repair, let h be the number of hot-standbynodes, such that h G; hence, the transmissions and writes tothe hot-standby nodes are the bottlenecks. Recall that in eachround, we can repair G chunks of the STF node in parallel,and they trigger a total of G · k chunks transmitted over thenetwork. Thus, each hot-standby node on average receives G·khchunks from the network and writes Ghrepaired chunks. Thus,tr = cbd + G · k · c h · bn + G · c h · bd(for hot-standby repair). (6)