Microsoft Technology Licensing, LLC

Lsi Corporation

Onstor, Inc.

Jonathan Scott Goldick

Luis Felipe Cabrera

Paul Adrian Oltean

Jeffrey Vincent Tofano

Disclosed is a method of reliably operating a RAID storage system. A first block of data is striped across a plurality of drives following a CRUSH algorithm. The first block of data is again striped across a second plurality of drives to a D'+P&#x2032; stripe and placed on free drive space following the CRUSH algorithm. The data is written in an asynchronous fashion and possibly at a time when system utilization is low.

Zero rebuild extensions for raid

A method and system creates and maintains a version-specific attribute or property that is stored as part of a file in a file system, contains specific version information relating to how or when the attribute was created and is automatically invalidated when a predetermined 'update' event occurs. Third party applications generally create and access these versions-specific attributes to thereby eliminate the need for external logs or databases to store persistent state information.

Method and system for creating and maintaining version-specific properties in a file

A filing system for a storage area network with inode based policy identifiers is disclosed. The filing system includes a processor and a storage device configured to store data. The processor receives an operation to perform on an object of the filing system and retrieves a policy identifier from an inode for the object. The processor then determines a policy from the policy identifier and determines whether execution of the operation is in compliance with the policy. The processor also determines an action to perform based on the determination of compliance with the policy.

Inode based policy identifiers in a filing system

Systems and methods transparently move a file service in a clustered environment of storage filers. A first storage filer generates file service data for the file service. The first storage filer associates the file service with an identification. The first storage filer allocates the file service data to at least one memory page in the first storage filer based on the identification. The first storage filer determines an indication to transfer the file service. The first storage filer then transfers at least one memory page using the identification to a second storage filer.

Systems and methods for transparent movement of file services in a clustered environment

A method and system that creates and maintains lock properties for a resource or object in a distributed environment. The method and system creates and/or updates lock objects to relate to multiple locks, i.e., multiple resources. The method and system creates and maintains lock properties for a resource or object in a distributed environment.

Locking multiple resources in a distributed environment

A method and system that creates and maintains lock properties for a resource or object in a distributed environment. The lock properties provide other client computer systems limited availability to the locked resource. Limited availability relates to being able to only read, write or delete the resource, or any combination thereof. Additionally, these lock properties allow other client computer systems to simultaneously hold or share equivalent locks. Other lock properties relate to advisory or mandatory status for the lock. Advisory locks may be honored or ignored by other client computer systems.

Method and system for locking resources in a distributed environment

An application programming interface protocol is provided for making requests to registered applications regarding applications' dependency information so that a table of dependency information relating to a target object can be recursively generated. When all of the applications' dependencies are captured at the same time for given volume(s) or object(s), the entire volume's or object's program and data dependency information may be maintained for the given time. With this dependency information, the computer system advantageously knows not only which files and in which order to freeze or flush files in connection with a backup, such as a snapshot, or restore of given volume(s) or object(s), but also knows which volume(s) or object(s) can be excluded from the freezing process. After a request by a service for application dependency information, the computer system can translate or process dependency information, thereby ordering recovery events over a given set of volumes or objects.

Registering and storing dependencies among applications and objects in a computer system and communicating the dependencies to a recovery or backup service

Method and system for locking multiple resources in a distributed environment

A system and method for managing the allocation of resources and locks to client computer systems. The system and method provides server-side control features related to resource requests for locked resources, such as establishing an expected lifetime property so that the sever may notify requesting clients as to the expected lifetime of a lock to improve client-side polling methods. The system and method relates to blocking a resource or otherwise maintaining subscriptions to lock-related events to effectively allow for asynchronous grants of a lock based on the time of the request to alleviate lock starvation. Another feature relates to a server-side lock function of breaking an existing lock or at least modifying/reducing a lock timeout period to prevent lost resources.

Method and system for managing resources in a distributed environment that has an associated object

A method and system creates and maintains a version-specific property or property that is stored as part of an object in a distributed environment, contains specific version information relating to how or when the property was created and is automatically invalidated when a predetermined &ldquo;update&rdquo; event occurs. Third party applications generally create and access these versions-specific properties to thereby eliminate the need for external logs or databases to store persistent state information.

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San Francisco, CA, United States of America

Jonathan Scott Goldick