公开(公告)号：US20190354286A1

公开(公告)日：2019-11-21

申请号：US16529844

申请日：2019-08-02

Applicant: EMC IP Holding Company LLC

Inventor： Jaeyoo Jung ,  Ramesh Doddaiah ,  Owen Martin ,  Arieh Don

IPC: G06F3/06

Abstract: Techniques for processing I/O operations may include: detecting, at a host, a sequence of I/O operations to be sent from the host to a data storage system, wherein each of the I/O operations of the sequence specifies a target address included in a first logical address subrange of a first logical device; sending, from the host, the sequence of I/O operations to a same target port of the data storage system, wherein each of the I/O operations of the sequence includes an indicator denoting whether resources used by the same target port in connection with processing said each I/O operation are to be released subsequent to completing processing of said each I/O operation; receiving the sequence of I/O operations at the same target port of the data storage system; and processing the sequence of I/O operations.

公开(公告)号：US11687243B2

公开(公告)日：2023-06-27

申请号：US17382447

申请日：2021-07-22

Applicant: EMC IP Holding Company LLC

Inventor： Venkata Ippatapu ,  Ramesh Doddaiah ,  Sweetesh Singh

IPC: G06F3/06 ,  G06F12/06

CPC classification number: G06F3/061 ,  G06F3/067 ,  G06F3/0655 ,  G06F3/0679 ,  G06F12/0692

Abstract: Aspects of the present disclosure relate to reducing the latency of data deduplication. In embodiments, an input/output (IO) workload received by a storage array is monitored. Further, at least one IO write operation in the IO workload is identified. A space-efficient probabilistic data structure is used to determine if a director board is associated with the IO write. Additionally, the IO write operation is processed based on the determination.

公开(公告)号：US11599441B2

公开(公告)日：2023-03-07

申请号：US16838079

申请日：2020-04-02

Applicant: EMC IP Holding Company LLC

Inventor： Ramesh Doddaiah ,  Malak Alshawabkeh ,  Mohammed Asher ,  Rong Yu

IPC: G06F11/00 ,  G06F11/34 ,  G06N20/00 ,  G06F9/50

Abstract: Embodiments of the present disclosure relate to throttling processing threads of a storage device. One or more input/output (I/O) workloads of a storage device can be monitored. One or more resources consumed by each thread of each storage device component to process each operation included in a workload can be analyzed. Based on the analysis, consumption of each resource consumed by each thread can be controlled.

公开(公告)号：US20220236900A1

公开(公告)日：2022-07-28

申请号：US17160526

申请日：2021-01-28

Applicant: EMC IP Holding Company LLC

Inventor： Ramesh Doddaiah ,  Steve Lathrop ,  Anoop Raghunathan ,  Jeremy O'Hare

IPC: G06F3/06

Abstract: Aspects of the present disclosure relate to data deduplication (dedup) techniques for storage arrays. In embodiments, a sequence of input/output (IO) operations in an IO stream received from one or more host devices by a storage array are identified. Additionally, a determination can be made as to whether a set of previously received IO operations match the identified IO sequence based on a time series relationship between the identified IO sequence and the previously received IO operations. Further, one or more data deduplication (dedup) techniques can be performed on the matching IO sequence.

公开(公告)号：US20210173782A1

公开(公告)日：2021-06-10

申请号：US16709013

申请日：2019-12-10

Applicant: EMC IP Holding Company LLC

Inventor： John Krasner ,  Ramesh Doddaiah

IPC: G06F12/0862 ,  G06F12/0893 ,  G06N3/04

Abstract: Embodiments of the present disclosure relate to cache memory management. Based on anticipated input/output (I/O) workloads, at least one or more of: sizes of one or more mirrored and un-mirrored caches of global memory and their respective cache slot pools are dynamically balanced. Each of the mirrored/unmirrored caches can be segmented into one or more cache pools, each having slots of a distinct size. Cache pool can be assigned an amount of the one or more cache slots of the distinct size based on the anticipated I/O workloads. Cache pools can be further assigned the amount of distinctly sized cache slots based on expected service levels (SLs) of a customer. Cache pools can also be assigned the amount of the distinctly sized cache slots based on one or more of predicted I/O request sizes and predicted frequencies of different I/O request sizes of the anticipated I/O workloads.

公开(公告)号：US20200320002A1

公开(公告)日：2020-10-08

申请号：US16375545

申请日：2019-04-04

Applicant: EMC IP Holding Company LLC

Inventor： Ramesh Doddaiah ,  Rong Yu

IPC: G06F12/0804

Abstract: Architectures and techniques are described that can address challenges associated with efficiently managing a cache of a data facility. In that regard, for each block (or other file system structure) of a storage array spanning multiple storage device, relationships can be established between other blocks of the array. The blocks can then be represented as multidimensional vectors, and an aggregation of the vectors can be represented as a weight matrix having values that reflect the corresponding relationships between any two given blocks. In response to any given IO transaction, a corresponding vector can be selected that is representative of a block referenced by the IO transaction and one or more target blocks having a high relationship value to the block can be identified and used in connection with a cache update procedure.

公开(公告)号：US11698744B2

公开(公告)日：2023-07-11

申请号：US17079702

申请日：2020-10-26

Applicant: EMC IP Holding Company LLC

Inventor： Ramesh Doddaiah

IPC: G06F3/06

CPC classification number: G06F3/0652 ,  G06F3/061 ,  G06F3/067

Abstract: Aspects of the present disclosure relate to data deduplication (dedup) techniques for storage arrays. At least one input/output (IO) operations in an IO workload received by a storage array can be identified. Each of the IOs can relate to a data track of the storage array. a probability of the at least one IO being similar to a previous stored IO can be determined. A data deduplication (dedup) operation can be performed on the at least one IO based on the probability. The probability can be less than one hundred percent (100%).

公开(公告)号：US20230027284A1

公开(公告)日：2023-01-26

申请号：US17382447

申请日：2021-07-22

Applicant: EMC IP Holding Company LLC

Inventor： Venkata Ippatapu ,  Ramesh Doddaiah ,  Sweetesh Singh

IPC: G06F3/06

Abstract: Aspects of the present disclosure relate to reducing the latency of data deduplication. In embodiments, an input/output (IO) workload received by a storage array is monitored. Further, at least one IO write operation in the IO workload is identified. A space-efficient probabilistic data structure is used to determine if a director board is associated with the IO write. Additionally, the IO write operation is processed based on the determination.

公开(公告)号：US11513849B2

公开(公告)日：2022-11-29

申请号：US17380164

申请日：2021-07-20

Applicant: EMC IP HOLDING COMPANY LLC

Inventor： Ramesh Doddaiah

IPC: G06F9/46 ,  G06F9/48 ,  G06F9/50 ,  G06F13/10

Abstract: A scheduler for a storage node uses multi-dimensional weighted resource cost matrices to schedule processing of IOs. A separate matrix is created for each computing node of the storage node via machine learning or regression analysis. Each matrix includes distinct dimensions for each emulation of the computing node for which the matrix is created. Each dimension includes modeled costs in terms of amounts of resources of various types required to process an IO of various IO types. An IO received from a host by a computing node is not scheduled for processing by that computing node unless enough resources are available at each emulation of that computing node. If enough resources are unavailable at an emulation, then the IO is forwarded to a different computing node that has enough resources at each of its emulations. A weighted resource cost for processing the IO is calculated and used to determine scheduling priority. The weights or regression coefficients from the model may be used to calculate weighted resource cost.

公开(公告)号：US11494283B2

公开(公告)日：2022-11-08

申请号：US16865458

申请日：2020-05-04

Applicant: EMC IP HOLDING COMPANY LLC

Inventor： Ramesh Doddaiah

IPC: G06F11/34 ,  G06F9/48

Abstract: A storage system has a QOS recommendation engine that monitors storage system operational parameters and generates recommended changes to host QOS metrics (throughput, bandwidth, and response time requirements) based on differences between the host QOS metrics and storage system operational parameters. The recommended host QOS metrics may be automatically implemented to adjust the host QOS metrics. By reducing host QOS metrics during times where the storage system is experiencing high volumes of workload, it is possible to throttle workload at the host computer rather than requiring the storage system to expend processing resources associated with queueing the workload prior to processing. This can enable the overall throughput of the storage system to increase. When the workload on the storage system is reduced, updated recommended host QOS metrics are provided to enable the host QOS metrics to increase. Historical analysis is also used to generate recommended host QOS metrics.