Asymmetric cluster storage systems are becoming a focus due to the high I/O performance
high scalability
easy management
etc.Storage virtualization is one of the key technologies to improve the scalability and manageability of cluster storage systems.From the perspective of building an intelligent storage router
this paper presented a block virtualization method with layered mapping
by which central management and distributed mapping for resource were implemented.This approach supports physical storage resources to be joined in storage system dynamically
and enables good scalability and manageability for the whole storage system.