Omneon Video Networks

Tektronix, Inc.

Harmonic, Inc.

Alexandru Mitaru

Richard Wissler Stallkamp

Douglas C Stevens

Michael Powell

Laurence J Morandi

Errol C Crary

Use and generation of an identifier. An indication of a value to be used to generate system-unique identifiers is received. The indication and an associated count value are stored in a metadata server interconnected with one or more remote metadata servers. A modified value to be used to generate system-unique identifiers generated based, at least in part, on the indication and the associated count value is transmitted to a remote metadata server.

Techniques for use of a system-unique identifier in an architecture having a file system utilizing distributed metadata servers

Use and maintenance of an idempotent journal in a system having multiple metadata servers. A data modification operation is performed by a metadata server. A journal entry corresponding to the data modification operation is generated. The journal entry includes a file identifier and a journal sequence number corresponding to a data modification operation that created the file.

Idempotent journal mechanism for file system

A system is disclosed having shared storage nodes and a number of processing nodes coupled to the shared storage nodes. The storage nodes are to store user data and file system meta-data (FSMD) and can be accessed by the processing nodes. Each respective processing node stores a copy of the FSMD, and can update its copy of the FSMD based upon content of a token received from one of the processing nodes. The processing node adds information to the token that describes a change that node makes to the copy of the FSMD, and then sends the token to another one of the processing nodes. Such a scheme may prove to be a more scalable solution for a shared file system as the number of processing nodes are increased, because the overhead associated with managing the meta-data does not significantly diminish the performance of the storage system as a whole.

Shared file system having a token-ring style protocol for managing meta-data

A fault tolerant, secondary storage engine (such as a RAID engine) is closely coupled with a file system to achieve greater overall throughput in storage/database applications having a mix of large, sequential access transactions and small, random access transactions. In addition, disk rebuild time may be greatly reduced using such an embodiment. A logical storage space representing a storage area in a set of non-volatile storage devices is divided into nonoverlapping storage allocation units (SAUs) such as stripes, each SAU to overlay all of the devices in the set. Different fault tolerant storage methodologies (FTSMs) are assigned to access (i.e. read/write) data in the different SAUs, respectively. An access is made to an SAU in the set responsive to an input storage request of a first or second type, respectively.

Tightly coupled secondary storage system and file system

An application programming interface for a digital disk recorder uses a port to link resources together to form a multimedia recorder that emulates a tape recorder while retaining the flexibility of the digital disk recorder. The port is a matrix of timelines for each resource, with each track in the port representing a media stream associated with a different one of the resources. A dynamic subsystem controls recording and playing back multimedia between the resources and a disk file system of the digital disk recorder using the port. A static subsystem maintains on the disk file system a database of movies recorded by the digital disk recorder from the resources according to the port, with each movie being a collection of media files for each resource that are independently accessible.

Growing community of inventors

Beaverton, OR, United States of America

Alexandru Mitaru