11888 results about "File system" patented technology

A plurality of data mover computers control access to respective file systems in data storage. A network client serviced by any of the data movers can access each of the file systems. If a data mover receives a client request for access to a file in a file system to which access is controlled by another data mover, then the data mover that received the client request sends a metadata request to the data mover that controls access to the file system. The data mover that controls access to the file system responds by placing a lock on the file and returning metadata of the file. The data mover that received the client request uses the metadata to formulate a data access command that is used to access the file data in the file system over a bypass data path that bypasses the data mover computer that controls access to the file system.

A system and method of manipulating notes linked to Web pages, and of manipulating the Web pages. These Web pages (or portions of Web pages) can be stored at a Web site or in a local file system. The method of linking notes to Web pages operates by enabling a user to select a portion of a Web page, creating a annotation, linking the annotation to the selected portion, receiving a request from a user viewing the annotation to display the selected portion linked to the annotation, and invoking an application, if the application is not already invoked, and for causing the application to load the Web page and present the selected portion.

The disclosed embodiments disclose techniques for managing a global namespace for a distributed filesystem. Two or more cloud controllers collectively manage distributed filesystem data that is stored in a cloud storage system; the cloud controllers ensure data consistency for the stored data, and each cloud controller caches portions of the distributed filesystem. Furthermore, a global namespace for the distributed filesystem is also split across these cloud controllers, with each cloud controller “owning” (e.g., managing write accesses for) a distinct portion of the global namespace and maintaining a set of namespace mappings that indicate which portion of the namespace is assigned to each cloud controller. During operation, an initial cloud controller receives a request from a client system to access a target file in the distributed system. This initial cloud controller uses the namespace mappings for the global namespace to determine a preferred cloud controller that will handle the request.

Methods for operating a network as a clustered file system is disclosed. The methods involve client load rebalancing, distributed Input and Output (I/O) and resource load rebalancing. Client load rebalancing refers to the ability of a client enabled with processes in accordance with the current invention to remap a path through a plurality of nodes to a resource. Distributed I/O refers to the methods on the network which provide concurrent input/output through a plurality of nodes to resources. Resource rebalancing includes remapping of pathways between nodes, e.g. servers, and resources, e.g. volumes/file systems. The network includes client nodes, server nodes and resources. Each of the resources couples to at least two of the server nodes. The method for operating comprising the acts of: redirecting an I/O request for a resource from a first server node coupled to the resource to a second server node coupled to the resource; and splitting the I/O request at the second server node into an access portion and a data transfer portion and passing the access portion to a corresponding administrative server node for the resource, and completing at the second server nodes subsequent to receipt of an access grant from the corresponding administrative server node a data transfer for the resource. In an alternate embodiment of the invention the methods may additionally include the acts of: detecting a change in an availability of the server nodes; and rebalancing the network by applying a load balancing function to the network to re-assign each of the available resources to a corresponding available administrative server node responsive to the detecting act.

For disaster recovery of a file server at an active site, the files that define the user environment of the file server are replicated to a virtual server at a disaster recovery site. To switch over user access from the active site to the disaster recovery site, the disaster recovery system determines whether there are sufficient network interfaces and file system mounts at the disaster recovery site. If so, the required resources are reserved, and user access is switched over. If not, an operator is given a list of missing resources or discrepancies, and a choice of termination or forced failover. Interruptions during the failover can be avoided by maintaining a copy of user mappings and a copy of session information at the disaster recovery site, and keeping alive client-server connections and re-directing client requests from the active site to the disaster recovery site.

In a digital data processing system having an on-line file system component, a method and apparatus for archiving the contents of a selected client volume stored on the file system. The archiving is performed automatically, beginning with an initial duplication of the existing contents of the client volume into an archive volume, then continuing as changes, including additions, deletions and modifications, are made to the files comprising the client volume. Older, previously-archived versions of modified files are gracefully discarded so as to moderate the rate of growth of the archive volume. The archive volume may be used to restore the client volume, either selectively or in whole, in the event of inadvertent damage to, or loss of, files in the client volume.

A system and method for “on-the-fly” de-duplication of data before storing the data in a storage system is provided. A data de-duplication module illustratively cooperates with protocol servers and a file system of a storage operating system executing on the storage system to implement the novel de-duplication technique. The de-duplication module illustratively generates a block store, an index file and a hash table on storage space provided by the storage system. The hash table is utilized for tracking fingerprints and locations of blocks within the block store. The index file is utilized for storing directory information identifying the contents of data containers stored on the storage system, while the block store is utilized to store raw data blocks that comprise the data containers.

A policy configurable file system includes a computer system upon which the policy configurable file system operates, a policy source for providing the configuration policies, and one or more file servers. The computer system includes software for enforcing one or more configuration policies. The policy source is typically either a policy server such that the policy is derived from the policy server, or a policy configurable file system, such that the policy is embedded in the policy configurable file system. The one or more file servers each uses a protocol, wherein the protocols of the one or more file servers are not all the same. In one case, the one or more of the configurable policies are separable from the policy configurable file system. In another case, the one or more configurable policies are downloadable to the computer system.

A distributed network-attached storage network provides content distribution using conventional file transfer protocols such as NFS and CIFS. A filer proxy accepts a client request and translates the client request to a file transfer protocol accepted at the file system having the file requested in the client request. The filer proxy generates a file handle for the file containing redundant filer proxy information to be used for failover to a backup filer proxy in the event of a network error or failure of an original filer proxy. The file handle also contains information for network security purposes such as detection of forged file handles.