Symantec Corporation

Veritas Technologies LLC

Oracle International Corporation

Rubrik, Inc.

Symantec Operating Corporation

Prasanta Ranjan Dash

Chaitanya Yalamanchili

Amarinder Singh Randhawa

Asmita Jagtap

Madhav Buddhi

Kenny C Gross

Craig Harmer

Sanjeev Raghavendrachar Sondur

Hao Wu

Kirubakaran Kaliannan

Satyendra Thakur

Brandon Patrick Byers

Yatin Nayak

Mark Evan Mills

Sathish Nayak

Sean Lobo

Vishal Kher

Samir Desai

Michael Wahl

Sara Abraham

Sudhakar Kasina

A second data source may retrieve metadata for one or more versions of a set of versions of a file stored at the first data source. In some examples, the metadata for the one or more versions of the file may include at least an identifier of the file, a timestamp, and a cryptographic signature. In some examples, generation of the cryptographic signature may be based on the identifier of the file, the timestamp, and a cryptographic key. The second data source may identify a set of versions of the file that were uploaded from a trusted data source to the first data source based on a comparison of the cryptographic signature to a computed cryptographic signature. The second data source may then determine a targeted version of the file and retrieve the targeted version of the file from the first data source.

Techniques for data retrieval using cryptographic signatures

The embodiments disclosed herein relate to intelligent configuration of a cloud-service gateway based on a pattern recognition algorithm. A machine-learning model is trained to learn the patterns of correlation among many configuration parameters affecting the performance of the system when processing an observed or estimated workload. Training the model may be performed off-line with performance data observed during experiments performed with a variety of configurations and workloads. Once trained, the model may be used to recommend: (a) new configuration parameter values based on constraints of the system being configured, (b) an amount of work that can be performed at a certain performance level when the system is configured with certain parameter values, or (c) the expected performance level when running a certain workload on the system configured with certain configuration parameter values.

Method and apparatus for configuring a cloud storage software appliance

Various systems and methods for managing node connectivity in distributed storage systems are disclosed. For example, one method involves detecting a communication fault between two nodes. A first node is configured to communicate input/output (I/O) requests to the second node as in-flight I/O requests. The second node is configured to communicate locally generated I/O requests and the received I/O requests to storage devices. Once the communication fault is detected, a fencing operation is performed. The fencing operation can include processing some of the received I/O requests by the second node, and rejecting any additional in-flight I/O requests received from the first node.

Performing fencing operations in multi-node distributed storage systems

A computer-implemented method for shipping I/O operations to prevent replication failure may include 1) attempting to perform an I/O operation in a system configured to replicate data from a data cluster to another data cluster, 2) detecting a failure in at least part of the attempt to perform the I/O operation that threatens to fail the system's replication of data from the data cluster to the other data cluster, and, in response to detecting the failure, 3) shipping the I/O operation from a node originally responsible for servicing the I/O operation to another node to complete the I/O operation without failing the system's replication of data from the data cluster to the other data cluster. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for shipping an I/O operation to prevent replication failure

Various systems and methods for performing Input/Output (I/O) quiesce and drain operations in multi-node distributed storage systems are disclosed. For example, one method involves receiving a message. The message indicates a request for a operation to be performed by a node, where the node can receive I/O requests from an application, as well as remote I/O requests from another node. The node can issue the I/O requests and the remote I/O requests to the one or more storage devices. In response to receipt of the message, the method performs a first portion of a operation on the node. The first portion of the operation includes the node not processing any additional locally generated I/O requests and processing additional remote I/O requests.

Performing I/O quiesce and drain operations in multi-node distributed systems

Various systems and methods for determining connectivity of various elements of distributed storage systems. For example, one method involves generating first connectivity information for a node, where the node can to access data that is organized using logical objects. The logical objects include first logical objects and second logical objects. Each of the second logical objects includes one or more of the first logical objects. The first connectivity information for the node indicates accessibility of the node to the first logical objects. The method also includes generating second node connectivity information for the node, where the second connectivity information for the node indicates accessibility of the node to the second logical objects. The generating the second node connectivity information is based on the first connectivity information.

Determining connectivity of various elements of distributed storage systems

A system and method for determining a status of a connection path. For example, the method can include receiving a control message at a first node of a number of nodes that are configured to form a cluster, identifying a second node of the nodes as a node from which the control message was received, identifying a storage device to which the second node is coupled; and determining a status of a connection path. The connection path is between the first node and the second node, and the second node and the storage device. The first node includes a first computer system, and the second node includes a second computer system.

Method to discover multiple paths to disk devices cluster wide

Systems and methods for shipping I/O operations to prevent replication failure

A method and system for load balancing. The method includes discovering each of a plurality of hosts in a cluster, wherein the plurality of hosts is configured for accessing a LUN of a storage system through a storage network fabric. Global input/output (I/O) load characteristics are collected for each of the plurality of hosts at the device and/or volume level. A selected host is determined for processing an I/O originating at the local host, wherein the host is selected based on a current set of the global I/O load characteristics.

Method and system for multi-layer differential load balancing in tightly coupled clusters

A list of servers known to a client is compared with lists of servers stored on the servers. An instance of content (e.g., a data file) can be accessed from a server on the list if at least a simple majority of the servers have the same version of the list.

Locating the latest version of replicated data files

A preferred node is selected for a specific functional role in a cluster. Dynamic and static parameters concerning the nodes are measured, including connectivity to shared storage. A user preference value is gleaned for each node, quantifying the user's preference of each corresponding node for the functional role. A preference rating is calculated for each node, based on the measured parameters and the gleaned user preference value. The preference rating indicates the node's suitability for the specific functional role, relative to the other nodes. Connectivity to shared storage in the cluster can be weighted more heavily than other parameters. Examples of specific functional roles in the cluster include becoming the master node, becoming a failover target for a specific application, or remaining in operation with access to shared cluster storage, in response to an occurrence of split brain.

Selecting preferred nodes for specific functional roles in a cluster

A system and method for discovering multiple paths to a disk device are disclosed. For example, the method can include discovering a plurality of paths that exist from a first host computer to a storage device. The plurality of paths includes at least one local path and at least one network path from the first host computer to the storage device. In addition, the first host computer is one of several host computers in a cluster. Once the paths have been discovered, a representation of the paths from the first host computer to the storage device is generated. Such a method can be performed, for example, without user intervention.

Growing community of inventors

San Jose, CA, United States of America

Prasanta Ranjan Dash