This object sets how many buffers are allocated for the write-acceleration feature on this flow, and per the desc the value is only meaningful when ciscoScsiFlowWriteAcc has actually been enabled for that flow. An admin tuning acceleration performance for a specific long-distance link increases this buffer count to allow more outstanding unacknowledged writes in flight, improving throughput on high-latency links at the cost of memory. A flow spanning a high-latency transcontinental FCIP tunnel might need a buffer count in the hundreds to keep the pipe full, whereas a short metro-distance flow might need only a handful.