Data storage and preservation Why to parallelize storage to work around limitations o individual device speed(think disk) .a file is typically stored on a single device ·network cards'speed 1 Gbit network still present network congestion on a node reduces bandwidth per stream o core network throughput o switches/routers are expensive o machines may have less throughput than their card(s)allow(s) ●hot data congestions o and the black hole it can generate as slower tranfers allow to accumulate more transfers strping mapreduce 8/62 S.Ponce-CERNData storage and preservation 8 / 62 S. Ponce - CERN devices // risks consistency safety c/c striping mapreduce Why to parallelize storage ? to work around limitations individual device speed (think disk) a file is typically stored on a single device network cards’ speed 1 Gbit network still present network congestion on a node reduces bandwidth per stream core network throughput switches / routers are expensive machines may have less throughput than their card(s) allow(s) hot data congestions and the black hole it can generate as slower tranfers allow to accumulate more transfers