Abstract: The present disclosure provides a method and a system for migrating a virtual file server. In an example of a method, a virtual file server is migrated from a first storage to a second storage, wherein the virtual file server comprises a server layer and a data layer. Identity information is retrieved from the server layer from the server layer for the second storage. The identity information is updated so instantiation of the virtual file server on the second storage appears the same as on the first storage.

Abstract: An system for quota arbitration of a distributed file system (DFS) may obtain a current amount of storage used by a given quota entity on storage segments of the DFS, the given quota entity having a global quota for the DFS and each of the storage segments being assigned a respective first quota limit for the given quota entity. The system may determine a global available quota amount for the given quota entity across all the storage segments based on the obtained current amounts of storage used by the given quota entity and the global quota, and provision of a respective second quota limit for the given quota entity to each of the plurality of storage segments, based on a division of all or less than all of the global available quota amount.

Abstract: The present disclosure provides a method and a system for migrating a virtual file server. In an example of a method, a virtual file server is migrated from a first storage to a second storage, wherein the virtual file server comprises a server layer and a data layer. Identity information is retrieved from the server layer from the server layer for the second storage. The identity information is updated so instantiation of the virtual file server on the second storage appears the same as on the first storage.

Abstract: Examples include quota arbitration of a distributed file system (DFS). Some examples obtain a current amount of storage used by a given quota entity on storage segments of the DFS, the given quota entity having a global quota for the DFS and each of the storage segments being assigned a respective first quota limit for the given quota entity. Some examples include determination of a global available quota amount for the given quota entity across all the storage segments based on the obtained current amounts of storage used by the given quota entity and the global quota, and provision of a respective second quota limit for the given quota entity to each of the plurality of storage segments, based on a division of all or less than all of the global available quota amount.

Abstract: A request to create a domain is received. The request is associated with a configuration parameter. The domain is indicative of a storage device comprising at least one volume for storing data pertaining to a file system (FS). Further, based on the configuration parameter, a configuration file set is created within the domain. The configuration file set is activated to load data structures corresponding to the configuration file set in a memory. The activation is based on a command received from an upper layer to perform an action on the configuration file set. Furthermore, configuration data is stored within the configuration file set when the action is performed on the configuration file set.

Abstract: The present disclosure provides a method and a system for migrating a virtual file server. In an example of a method, a virtual file server is migrated from a first storage to a second storage, wherein the virtual file server comprises a server layer and a data layer. Identity information is retrieved from the server layer from the server layer for the second storage. The identity information is updated so instantiation of the virtual file server on the second storage appears the same as on the first storage.

Abstract: A system and method for flexible device driver resource allocation is disclosed. In one embodiment, a method for allocating device driver resources in a data processing system includes statically allocating hardware resource pools to device drivers on a rigid basis during initialization of the data processing system, and dynamically altering the allocated hardware resource pools to the device drivers based on parameters associated with utilization of the allocated hardware resource pools during run-time.

Abstract: A method and system for optimizing network I/O throughput is disclosed. In one embodiment, a method for optimizing an input/output (I/O) throughput for a storage network comprises measuring a service time for a storage device of the storage network in completing an I/O request serviced by a storage driver. The method also comprises determining a status of an I/O performance between the storage driver and the storage device by comparing the service time with an expected service time for the storage device in completing the I/O request, where the expected service time is calculated based on a type of the storage device and a size of the I/O request. The method further comprises adjusting a maximum queue depth associated with the storage device based on the status of the I/O performance.

Abstract: A method generates input/output (IO) commands by plural different applications that execute on a host. The method prioritizes the applications by inserting different classifiers into the IO commands at a host bus adapter (HBA) located in the host. A storage device receives the IO commands and processes the IO commands according to priorities based on the classifiers for the applications.

Abstract: A method and system of a host device hosting multiple workloads for controlling flows of I/O requests directed to a storage device is disclosed. In one embodiment, a type of a response from the storage device reacting to an I/O request issued by an I/O stack layer of the host device is determined. Then, a workload associated with the I/O request is identified among the multiple workloads based on the response to the I/O request. Further, a maximum queue depth assigned to the workload is adjusted based on the type of the response, where the maximum queue depth is a maximum number of I/O requests from the workload which are concurrently issuable by the I/O stack layer.

Abstract: A method and system for an improved input/output (I/O) request quality of service (QoS) across multiple host I/O ports are disclosed. In one example, an I/O request associated with a classification parameter is received. The I/O request is generated by one of a plurality of host servers. Further, a classification value is determined based on the classification parameter by a host tagging agent residing one of the plurality of host servers. Furthermore, the classification value is associated with the I/O request by the host tagging agent. In addition, the I/O request is prioritized based on the classification value by a host port queuing manager and a host QoS controller. Based on the priority, the I/O request is sent to one of a plurality of target devices by the host port queuing manager and the host QoS controller.

Abstract: Systems and methods for path selection for application commands are described. To this end, information associated with at least one application command that were processed at least one port of a target device is received. For a subsequent application command, a set of ports of the target device is determined. In one implementation, the set of ports is determined based on information associated with the subsequent application command. Once the set of ports is determined, the subsequent application command is directed to a port selected from the set of ports.

Abstract: A method and system for processing an input/output request on a multiprocessor computer system comprises pinning a process down to a processor issuing the input/output request. An identity of the processor is passed to a device driver which selects a device adapter request queue whose interrupt is bound to the identified processor and issues the request on that queue. The device accepts the request from the device adapter, processes the request and raises a completion interrupt to the identified processor. On completion of the input/output request the process is un-pinned from the processor. In an embodiment the device driver associates a vector of the identified processor with the request and the device, on completion of the request, interrupts the processor indicated by the vector.

Abstract: The host interface module is configured to receive a plurality of I/O request which includes an associated priority; create an I/O request queue for each associated priority; define a threshold value for the queue length for each of the plurality of I/O request queues; and determine if the queue length for one of the plurality of the I/O request queue corresponding to the associated priority is less than the defined threshold value for the queue length for the one of the plurality of the I/O request queues. If the queue length of the one of the plurality of I/O request queues is more than the defined threshold value for the queue then the host interface module is further configured to rejecting the I/O request and sending a queue full message; wherein the threshold value for the queue length is based on the processing rate of the I/O requests in the plurality of the I/O request queues.

Abstract: The present invention relates to managing I/O requests in a storage system. By dynamically changing the scheduling parameters to achieve optimal turn around time for I/O requests pending for processing at a component in the storage system. The scheduling parameters are changed based on a feedback mechanism. The turn around time of the I/O request are calculated as the ratio of I/O request processing rate and the average number of I/O requests in the component.

Abstract: The method, apparatus and system of an I/O forwarding technique for multi-interrupt capable I/O devices are disclosed. In one embodiment, a method of transferring an I/O request in a cache-coherent non-uniform memory access (ccNUMA) computer system including multiple cells (e.g., each cell may include multiple processors) that are connected via a system interconnect, includes receiving an I/O request from one of the multiple processors associated with one of the multiple cells in the ccNUMA computer system, associating a processor, corresponding to a multi-interrupt capable I/O interface that is servicing the I/O request, located in the one of the multiple cells as a lead processor, and executing an I/O initiation path and a completion path associated with the received I/O request on the lead processor upon associating the lead processor corresponding to the multi-interrupt capable I/O interface.

Abstract: A method generates input/output (IO) commands by plural different applications that execute on a host. The method prioritizes the applications by inserting different classifiers into the IO commands at a host bus adapter (HBA) located in the host. A storage device receives the IO commands and processes the IO commands according to priorities based on the classifiers for the applications.

Abstract: Method(s) for providing Quality of Service (QoS) control in a plurality of sections of a network environment are described herein. Each of the plurality of sections includes at least one device to provide QoS control in the respective section. Further, in each of the plurality of sections of the network environment, one or more fields of a WIT are identified. An application command, generated at a section of the network environment, is provided quality of service in the plurality of sections, based on the one or more fields identified from the WIT.

Abstract: Systems and methods for path selection for application commands are described. To this end, information associated with at least one application command that were processed at least one port of a target device is received. For a subsequent application command, a set of ports of the target device is determined. In one implementation, the set of ports is determined based on information associated with the subsequent application command. Once the set of ports is determined, the subsequent application command is directed to a port selected from the set of ports.

Abstract: Methods for classification of application commands are described. An application command associated with a classification parameter is generated by an application in a first device. A classification value is determined for the application command based on the classification parameter. The classification value is associated with the application command and is sent to a second device for processing.