Daniel L Mccarthy

US Patent:

20220391361, Dec 8, 2022

Filed:

Oct 1, 2021

Appl. No.:

17/449760

Inventors:

- San Jose CA, US
Daniel McCarthy - Erie CO, US
Arindam Banerjee - Fremont CA, US

International Classification:

G06F 16/182
G06F 16/188
G06F 16/16

Abstract:

A method for reducing write latency in a distributed file system. A write request that includes a volume identifier is received at a data management subsystem deployed on a node within a distributed storage system. The data management subsystem maps the volume identifier to a file system volume and maps the file system volume to a set of logical block addresses in a logical block device in a storage management subsystem deployed on the node. The storage management subsystem maps the logical block device to a metadata object for the logical block device on the node that is used to process the write request. The mapping of the file system volume to the set of logical block addresses in the logical block device enables co-locating the metadata object with the file system volume on the node, which reduces the write latency associated with processing the write request.

US Patent:

20220278943, Sep 1, 2022

Filed:

Feb 26, 2021

Appl. No.:

17/187336

Inventors:

- Sunnyvale CA, US
Christopher Cason - Boulder CO, US
Daniel McCarthy - Erie CO, US

Assignee:

NetApp, Inc. - Sunnyvale CA

International Classification:

H04L 12/927

Abstract:

Systems and methods for quality of service management are provided. According to one embodiment, a non-transitory computer-readable medium comprises instructions that when executed by the processing resource cause the processing resource to receive, in a normalizing agent, one or more compute load parameters from one or more background compute processes executing on the one or more computer systems and one or more Quality of Service (QoS) parameters for one or more client compute processes executing on the one or more computer systems, convert the one or more compute load parameters to one or more normalized utilization metrics, and execute instructions that cause a processor to adjust a compute resource allocation dedicated to the one or more background compute processes based at least in part on the one or more normalized utilization metrics and the one or more QoS parameters

US Patent:

20230013281, Jan 19, 2023

Filed:

Sep 16, 2022

Appl. No.:

17/932753

Inventors:

- San Jose CA, US
Daniel David McCarthy - Erie CO, US
Sneheet Kumar Mishra - Lafayette CO, US
Austino Nicholas Longo - Superior CO, US

Assignee:

NetApp, Inc. - San Jose CA

International Classification:

G06F 3/06
G06F 9/50
G06F 11/10
G06F 11/14
G06F 11/30

Abstract:

A technique is configured to provide various data protection schemes, such as replication and erasure coding, for data blocks of volumes served by storage nodes of a cluster configured to perform deduplication of the data blocks. Additionally, the technique is configured to ensure that each deduplicated data block complies with data redundancy guarantees of the data protection schemes, while improving storage space of the storage nodes. In order to satisfy the data integrity guarantees while improving available storage space, the storage nodes perform periodic garbage collection for data blocks to optimize storage in accordance with currently applicable data protection schemes.

US Patent:

20210334160, Oct 28, 2021

Filed:

Apr 24, 2020

Appl. No.:

16/858376

Inventors:

- Sunnyvale CA, US
Daniel David McCarthy - Erie CO, US
Christopher Clark Corey - Boulder CO, US
Austino Nicholas Longo - Lafayette CO, US
Christopher Cason - Boulder CO, US

International Classification:

G06F 11/10
H03M 13/15

Abstract:

A technique provides efficient data protection, such as erasure coding, for data blocks of volumes served by storage nodes of a cluster. Data blocks associated with write requests of unpredictable client workload patterns may be compressed. A set of the compressed data blocks may be selected to form a write group and an erasure code may be applied to the group to algorithmically generate one or more encoded blocks in addition to the data blocks. Due to the unpredictability of the data workload patterns, the compressed data blocks may have varying sizes. A pool of the various-sized compressed data blocks may be established and maintained from which the data blocks of the write group are selected. Establishment and maintenance of the pool enables selection of compressed data blocks that are substantially close to the same size and, thus, that require minimal padding.

US Patent:

20210320975, Oct 14, 2021

Filed:

Apr 10, 2020

Appl. No.:

16/845786

Inventors:

- Sannyvale CA, US
Daniel David McCarthy - Erie CO, US

International Classification:

H04L 29/08
H04L 12/861
H04L 12/24

Abstract:

An Updating No Sync (UNS) technique ensures continuous data protection for content driven distribution of data served by storage nodes of a fault tolerant cluster in the event of a degraded cluster state. A storage service implemented in each node includes one or more slice services (SSs) configured to process and store metadata describing the data served by the storage nodes and one or more block services (BSs) configured to process and store the data on storage devices of the node. A bin assignment service may coopt one or more healthy BSs to temporarily store updates of data and metadata received at the SS while the cluster is in the degraded state as an overflow data path (hence the term “Updating No Sync,” which denotes updating without synchronizing, i.e., not distributing the data within the cluster, but only accumulating an overflow of SS information). Once the cluster is no longer degraded, the accumulated overflow SS information at the BSs may be synchronized back to restored BSs, i.e., according to write path determination in the absence of node failure/unavailability.

US Patent:

20210248254, Aug 12, 2021

Filed:

Feb 12, 2020

Appl. No.:

16/788979

Inventors:

- Sunnyvale CA, US
Daniel David McCarthy - Erie CO, US
Christopher Clark Corey - Boulder CO, US
Sneheet Kumar Mishra - Lafayette CO, US

International Classification:

G06F 21/62
G06F 16/27
H04L 9/32

Abstract:

A bin syncing technique ensures continuous data protection, such as replication and erasure coding, for content driven distribution of data served by storage nodes of a cluster in the event of failure to one or more block services configured to process the data. The cluster maintains information about the block services assigned to host a bin with a copy of the data in a bin assignment table associated with a state. The copies of the data are named, e.g., replica 0 (R0), replica 1 (R1) or replica 2 (R2). In response to failure of one or more block services assigned to host a bin with a replica of the data, an alternate or replacement block service may access the assignments maintained in the bin assignment table, which specify names of the replicas associated with the state.

US Patent:

20200117372, Apr 16, 2020

Filed:

Oct 15, 2019

Appl. No.:

16/601978

Inventors:

- Sunnyvale CA, US
Daniel David McCarthy - Erie CO, US
Sneheet Kumar Mishra - Lafayette CO, US
Austino Nicholas Longo - Lafayette CO, US

International Classification:

G06F 3/06
G06F 11/14
G06F 11/10
G06F 11/30
G06F 9/50

Abstract:

A technique is configured to provide various data protection schemes, such as replication and erasure coding, for data blocks of volumes served by storage nodes of a cluster configured to perform deduplication of the data blocks. Additionally, the technique is configured to ensure that each deduplicated data block complies with data redundancy guarantees of the data protection schemes, while improving storage space of the storage nodes. In order to satisfy the data integrity guarantees while improving available storage space, the storage nodes perform periodic garbage collection for data blocks to optimize storage in accordance with currently applicable data protection schemes.

US Patent:

20170364704, Dec 21, 2017

Filed:

Jun 20, 2016

Appl. No.:

15/186787

Inventors:

- SUNNYVALE CA, US
Daniel McCarthy - Erie CO, US

International Classification:

G06F 21/62
G06F 21/60
H04L 9/06

Abstract:

A server node with one or more processors is configured to receive a request to write data to a storage medium and compress the data to yield compressed data. The one or more processors are further configured to encrypt the compressed data according to an encryption key to yield compressed and encrypted data. The one or more processors are further configured to hash the compressed and encrypted data to yield one or more block identifiers that uniquely represent the compressed and encrypted data.