International Business Machines Corporation

Carsten Brixius

Wayne A Sawdon

Gregory John Tevis

David Gregory Van Hise

Christian Mueller

Wayne Curtis Hineman

Christian Bolik

Douglas Stephen Noddings

Dietmar Fischer

An apparatus, system, and method are disclosed for analyzing a file system. A record module records file parameters comprising a file size, a file age, a time of last access, a file type, a recovery time objective, and an initial access time service level objective for each file in the file system. A file score module calculates a file score for each file using the file parameters. A system score module calculates the file system score as the sum of the normalized file scores. A process module processes the file system if the file system score exceeds a specified threshold.

Apparatus, system, and method for analyzing a file system

One aspect of the present invention provides an operation for recovering lost space and maintaining data consistency in a storage environment by providing a two-way orphan reconciliation method for extremely large file systems, such as a Hierarchical Storage Management (HSM) system which manages billions of files. This highly scalable and parallelizable orphan identification process may be used in a HSM controlled environment to enable the execution of a two-way file orphan check. In one embodiment, this orphan check identifies file system client orphans and server object orphans in a single pass by comparing a queue containing a list of migrated files on a storage repository server with a queue containing a list of stub files on a file system. If the queue elements do not match, a file system orphan or server object orphan can appropriately be identified.

HSM two-way orphan reconciliation for extremely large file systems

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Niedermoschel, Germany

Carsten Brixius