I/O system supporting extended functions and method therefor

摘要: A device, system and methods of data management are disclosed, which facilitate the implementation improved mirroring, back-up, volume remapping, extent relocation, prefetching, caching, reformatting, statistic gathering, translation, among others. new, intelligent I/O stream splitter is disclosed that may intercept alter an received by from a communications link. For example, in case write commands associated mainframe target specific storage location on control unit. The then transmit intercepted to targeted unit over one link parallel another altered version unit, responsible for holding mirrored data. could have same as but new frame headers injected at appropriate points stream. Moreover, improve functionality extended functions such mirroring well. alterations include changes information stream, address instead primary But also itself, including formatting, filtering translating. host be connected potentially several splitters implement cooperatively. Among other things, used configure perform (or other) operation physical level addressing, though receive requests expressed logical level. map name addresses accordingly. instruct create send streams independently any passing through splitter. This created correspond entire CCW ESCON contexts.