Veritas Technologies LLC

Symantec Corporation

Ajay Salpekar

Brad Boyer

Balemurughan Kumaresan

Freddy James

Craig Harmer

Charles Silvers

Bala Kumaresan

Darshan Joshi

Madhav Buddhi

Joseph Michael Maionchi

Sunil Kumar Tekkatte Subramanya

Pramodh Pisupati

Edwin Menze

Anurag Vora

Jonathan Purcell

Ashish Yajnik

Rachit Chadha

The disclosed computer-implemented method for delayed allocation in cluster storage may include (i) delegating, to a node attached to a storage cluster including one or more storage devices that include a group of allocation units, a subset of allocation units on the storage cluster to be held as a delayed allocation pool, (ii) receiving, from the node, a request to allocate allocation units on the storage cluster, (iii) deducting the number of allocation units from available allocation units in the delayed allocation pool, (iv) satisfying the allocation request by allocating allocation units not in the delayed allocation pool before allocating allocation units included in the delayed allocation pool, and (v) recalculating, based on the number of allocation units in the delayed allocation pool used to satisfy the allocation request, the number of available allocation units in the delayed allocation pool. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for delayed allocation in cluster storage

The disclosed computer-implemented method for efficiently moving data within a filesystem may include (1) partitioning, on a storage device, physical address space of a filesystem into a plurality of logical partitions, (2) allocating, on the storage device, at least one container of data block identifiers representing data blocks for each of the logical partitions, (3) maintaining, on the storage device, a partition map of values identifying the container of data block identifiers, the logical partitions, and at least one offset associated with each of the logical partitions, (4) sending, on the storage device, the data blocks from a source logical partition within the logical partitions to a target logical partition within the logical partitions, and (5) updating, on the storage device, the partition map based on the data blocks sent from the source logical partition to the target logical partition. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for efficiently moving data within a filesystem

A computer-implemented method for performing copy-on-write operations may include (1) identifying a write operation addressed to at least a part of a storage area on a storage system, (2) determining that the storage area is configured to be copied before writing to the storage area in order to preserve original data stored within the storage area, (3) identifying an interface for offloading copy-on-write operations to the storage system, and (4) using the interface to instruct the storage system to create a copy of the storage area modified with the write operation. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for performing copy-on-write operations

Systems and methods for extent reference count updates are presented. In one embodiment; a reference count update method includes: receiving an indication of new reference association with an extent of a shared storage component; generating reference count update log information for a reference count update log to indicate the new reference association with an extent of a shared storage component, wherein the altering occurs inline; forwarding a successful data update indicator to initiator of activity triggering the new reference association with the extent of the shared storage component; and updating a reference count table in accordance with the information in the reference count update log, wherein the updating is included in a background process.

Extent reference count update system and method

Techniques for implementing an adaptive data access error handling policy are disclosed. In one particular exemplary embodiment, the technique may be realized as a system comprising a shared storage device communicatively coupled to a network, and a computer cluster communicatively coupled to the network, the computer cluster comprising a plurality of nodes each mounting a shared file system thereon, a first node of the plurality of nodes to send a data access request to the shared storage device, to identify a data access error associated with the data access request, and to determine whether to permit access to the shared file system based on the data access error being a local data access error or a global data access error.

Techniques for implementing an adaptive data access error handling policy

Growing community of inventors

Hayward, CA, United States of America

Ajay Salpekar