Emc IP Holding Company LLC

Netapp, Inc.

Michael J Noeth

Alan Lee Taylor

Peter John McCann

Steven A Morley

Michael C Brundage

Joseph Brown

Michael Paul Wagner

Brian Naylor

Manish Bhuwania

Sally Wahba

Snehal Kamble

Satish Cherbrolu

Techniques are presented for implementing a scalable approach to keeping track of the metadata validity of persistently-stored metadata for storage objects. In contrast with prior approaches, improved techniques only store a list of the invalid (or quarantined) objects rather than all objects regardless of validity of their metadata. Under normal circumstances, only a small number of storage objects are invalid at any given time, as the system generally takes steps to repair the invalid objects in the normal course of operation. Thus, the number of invalid objects tends to be small, barring some catastrophic system failure. Only a small amount of expensive privileged persistent storage is therefore needed. A health level may also be used to indicate many failures, indicative of catastrophic system failure.

Quarantining storage objects using a quarantine list

A method, device, and non-transitory computer readable medium for mirroring data, comprising, selecting, based on a plurality of data attributes, a portion of local data in a local storage device for mirroring to a remote storage device and copying the selected portion of the local data to at least one cache memory of the remote storage device. Next a determination of when a failover event has occurred in the local storage device is made, wherein the failover event comprises an event in which the local data in the local storage device is inaccessible to a client computing device when the client computing device attempts to access the local data from the local storage device. A copy of the local data from the cache memory in the remote storage device is retrieved when the failover event is determined to have occurred.

Methods for flexible data-mirroring to improve storage performance during mobility events and devices thereof

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Cary, NC, United States of America

Michael J Noeth