Most of traditional mass-storage systems are high-cost,hard to manage,and difficult to upgrade.So a new PB-level cloud-storage system named formicary file system (FFS) was prevailed,which draw on the idea of utility-storage and storage-virtualization.FFS is built from many inexpensive commodity components that often fail,it has parallel expansibility,it can switch failure and renew data automatically,and it can balance work-load and data-load dynamically.Through the technology of virtualization,it can provide the aggregate storage resource to the client in the form of a common disk.The forth the architecture and key-technic of FFS,and at last,a test towards FFS is made.The test results show that at the experiment condition of a 17-PC-built cluster,the maximum aggregate read-rate can reach to 105Mbit/s,as well as the maximum aggregate write-rate can reach to 49.4Mbit/s,and during the test,FFS behaves well at load balance.
