File system replication

Abstract

A data backup system for data and metadata is stored in a file storage system. Data in the file system is stored in a remote low priority data storage system, such as a remote tape storage system, power-managed array of secondary storage disks (MAID), or other lower cost secondary data storage system. Metadata for the file system is stored in a remote higher priority system, such as a remote disk storage system. As such, the data and metadata for a file storage system maintained at a primary location is backed-up in different types of storage systems at a remote location. By storing the data and metadata in different types of storage, the data can be backed up at less cost. In case of a disaster at the primary storage location, a user accessing data from a local server may be switched to access the data and the metadata from the remote server.

Dependencies are inferred from the claim text.