Abstract: Techniques for file system recovery are disclosed. In one particular exemplary embodiment, the techniques may be realized as a method for file system recovery comprising starting a recovery process for a failed node, utilizing the recovery process to read one or more committed but un-applied transactions from storage associated with the failed node, and recreating the one or more committed but un-applied transactions in memory associated with the recovery process.

Abstract: Techniques for file system recovery are disclosed. In one particular exemplary embodiment, the techniques may be realized as a method for file system recovery comprising starting a recovery process for a failed node, utilizing the recovery process to read one or more committed but un-applied transactions from storage associated with the failed node, and recreating the one or more committed but un-applied transactions in memory associated with the recovery process.

Abstract: Method, system, and apparatus for maintaining consistent images of metadata and data in a file system or other data journaling software stored on a temporal volume are presented. An intent log is maintained of all data and metadata modifying transactions, which is then relayed either asynchronously or form a last known consistent checkpoint to a requested checkpoint thereby rendering the requested checkpoint data and metadata consistent.

Abstract: Techniques for file system recovery are disclosed. In one particular exemplary embodiment, the techniques may be realized as a method for file system recovery comprising starting a recovery process for a failed node, utilizing the recovery process to read one or more committed but un-applied transactions from storage associated with the failed node, and recreating the one or more committed but un-applied transactions in memory associated with the recovery process.

Abstract: A method, system, and apparatus to encapsulate one or more file systems in a union of file systems without modifying or copying information in each file directory entry in each file system are presented. In one embodiment, this is accomplished in part by linking an inode list file from the file system to be encapsulated with an inode list file of the union of file systems, and merging a free extent map of the to-be-encapsulated file system with the free extent map file of the union file system.

Abstract: System and method for partial file migration in file systems by Hierarchical Storage Management (HSM) applications. Embodiments may provide an automated mechanism for HSM applications to partially migrate files by migrating the inactive parts of the files to offline storage while leaving the active parts of the files on disk and active in the file system. In embodiments, access information including timestamps may be recorded and maintained at the subfile level to enable detection of inactivity at the subfile level and hence partial file migration by migrating only the inactive parts of files. The parts of files may be extents, blocks, or ranges. The access information may be recorded and maintained in-memory only, in a separate file on disk, or in extent descriptors for the files.

Abstract: A method may involve assigning each of a plurality of freelists and a plurality of hashlists used to implement a cache to one of a plurality of lock groups and acquiring one of a plurality of locks. Objects on each freelist and hashlist that are assigned to the same lock group are allocated from the same one of a plurality of memory allocation pools. Each lock group is associated with a respective one of the plurality of locks. Acquiring the lock locks a freelist and several hashlists included in an associated lock group of the plurality of lock groups.

Abstract: A method may involve assigning each of a plurality of freelists and a plurality of hashlists used to implement a cache to one of a plurality of lock groups and acquiring one of a plurality of locks. Objects on each freelist and hashlist that are assigned to the same lock group are allocated from the same one of a plurality of memory allocation pools. Each lock group is associated with a respective one of the plurality of locks. Acquiring the lock locks a freelist and several hashlists included in an associated lock group of the plurality of lock groups.