Thought a lot of normal and DDOS attack experiment found I/O traffic change,protocol statistics,packet data statistic and port statistic and so on,shese features have badly changes,made research of DDOS detection method based on I/O traffic and features likeness.

For store-and-forward, network storage I/O pipelining has some new characteristic and restricted factors.

In this paper,the authors carefully investigate the basic I /O stream sharing techniques including batching,adaptive piggybacking,bridging and chaining and also introduce some recent development.

consulting the analogue simulate examples of switch quantity sequence control process,emphasize explain base on logic evolving chart to arrange I/O condition flow chart analogue simulate method.