Data Layout of Logistic Evolution Storage System
In order to change the status that storage system can not adapt to dynamic workloads,The paper introduced a new concept of logistic evolution storage system and design a data layout which can make transformation among varies RAID levels easy.By analyzing action of RAID1 and RAID5 under synchronous workload, we deducing a approximation analytical expression to predict disk array mean response time and compute threshold of parameters for RAID organization transformation. In order to get the best performance for varies RAID levels,we also introduce a method which adjusts stripe unit size for adapting varies workloads and deduce the optimal stripe unite size. Finally, we carry out a large number of simulations to validate our analytical result.