Netapp, Inc.

Network Appliance, Inc.

Todd Mills

Atul Goel

Kyle Diggs Sterling

Suhas Urkude

Rajesh Sundaram

Douglas W Coatney

Mayank Saxena

Reyaz Ahmed

Aleksandr Sergeev Khasymski

The disclosed embodiments relate to systems and methods for coordinating management of a shared disk storage between nodes. Particularly, a messaging protocol may be used to communicate notifications regarding each node's perception of the shared storage's state. The nodes may use the messaging protocol to achieve consensus when recovering from a storage device failure. Some embodiments provide for recovery when localized failures, such as failures at an adapter on a node, occur.

Storage failure processing in a shared storage architecture

Methods and systems for a storage environment are provided. A policy for an input/output (I/O) stream having a plurality of I/O requests for accessing storage at a storage device of the storage sub-system is translated into flow attributes so that the I/O stream can be assigned to one of a plurality of queues maintained for placing I/O requests based on varying priorities defined by set polices. When an I/O request for the associated policy is received by the storage sub-system; the storage sub-system determines a flow attribute associated with the I/O request and the policy; selects a queue for staging the I/O request, such that the selected queue is of either higher priority than what is indicated by the flow attribute or at least of a same priority as indicated by the flow attribute; and allocates storage sub-system resource for processing the received I/O request.

Resource allocation in networked storage systems

A shared storage architecture is described for coordinating management of a shared storage between nodes of a network storage system. In various embodiments, the shared storage is partitioned into and different partitions are assigned to different nodes of the network storage system. The shared storage architecture provides techniques for asserting reservations on the shared storage, managing state of the shared storage, and implementing various configurations of the network storage system using the shared storage.

Shared storage architecture

A storage system with an array of redundant storage devices places bounds on access request servicing. If a storage device is unable to service the access request within the bounds, the storage system temporarily, individually offlines the specific storage device. Access requests pending for the storage device may be serviced by other storage devices of the redundant array while the storage device is offline. The offline storage device can perform error recovery and be brought back online by the system when error recovery has completed.

Growing community of inventors

Union City, CA, United States of America

Todd Mills