Netapp, Inc.

Manoj V Sundararajan

Yuedong Mu

Ching-Yuk Paul Ngan

Susan M Coatney

Paul Yuedong Mu

Paul Ngan

Synchronization metadata is read from non-volatile storage. The synchronization metadata comprises indications of one or more synchronization targets. A synchronization target is a node of a clustered storage system. A synchronization cache is populated with the synchronization metadata. After populating the synchronization cache with at least a portion of the synchronization metadata, a connection to a network is established. After the connection to the network is established, a connection to a first of the one or more synchronization targets is established.

Synchronization cache seeding

Various embodiments are directed to techniques for coordinating at least partially parallel performance and cancellation of data access commands between nodes of a storage cluster system. An apparatus may include a processor component of a first node coupled to a first storage device storing client device data; an access component to perform replica data access commands of replica command sets on the client device data, each replica command set assigned a set ID; a communications component to analyze a set ID included in a network packet to determine whether a portion of a replica command set in the network packet is redundant, and to reassemble the replica command set from the portion based if the portion is not redundant; and an ordering component to provide the communications component with set IDs of replica command sets of which the access component has fully performed the set of replica data access commands.

Techniques for coordinating parallel performance and cancellation of commands in a storage cluster system

Various embodiments are generally directed an apparatus and method for receiving information to write on a clustered system comprising at least a first cluster and a second cluster, determining that a failure event has occurred on the clustered system creating unsynchronized information, the unsynchronized information comprising at least one of inflight information and dirty region information, and performing a resynchronization operation to synchronize the unsynchronized information on the first cluster and the second cluster based on log information in at least one of an inflight tracker log for the inflight information and a dirty region log for the dirty region information.

Techniques for performing resynchronization on a clustered system

A request to perform a coordinated action is received. The coordinated action comprises a first plurality of operations. In response to reception of the request to perform the coordinated action, a second plurality of operations is performed in preparation for performing the coordinated action. A response to the request to perform the coordinated action is sent. The response to the request to perform the coordinated action comprises an indication that the first device will perform the coordinated action. An indication that the coordinated action is to be performed is received. In response to reception of the indication that the coordinated action is to be performed, the first plurality of operations is performed.

Clustered storage system synchronization

A primary write request that is to modify a primary portion of primary data stored in a primary storage node is received. The primary write request is to be replicated to create a current secondary write request. The current secondary write request is to modify a current secondary portion of secondary data that is stored in a secondary storage node. A current data range of the current secondary portion is determined. A determination is made of whether a previous secondary write request is in process of modifying a previous data range that at least partially overlaps with a current data range of the current secondary portion. Execution of the primary write request is suspended, until the previous secondary write request has completed updating the secondary storage node.

Overlapping write detection and processing for sync replication

A distributed storage system replicates data for a primary logical storage object on a primary node of the storage system to a secondary logical storage object on a secondary node on the distributed storage system. Failures in writing data to the primary logical storage object or failures in the replication of the data to the secondary logical storage object can cause data that should be synchronized to become divergent. In cases where the data may be divergent, reconciliation operations can be performed to resynchronize the data.

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Sunnyvale, CA, United States of America

Manoj V Sundararajan