公开(公告)号：US11614879B2

公开(公告)日：2023-03-28

申请号：US17218465

申请日：2021-03-31

Applicant: Nutanix, Inc.

Inventor： Alok Nemchand Kataria ,  Niranjan Sanjiv Pendharkar ,  Pete Wyckoff ,  Rishi Bhardwaj ,  Rohit Jain ,  Shubham Shukla ,  Tabrez Parvez Memon

IPC: G06F3/06 ,  H04L67/1097

Abstract: A technique replicates an index of an operations log (oplog) from a primary node to a secondary node of a cluster in the event of failure. The oplog functions as a staging area to coalesce random write operations directed to a virtual disk (vdisk) stored on a backend storage tier. The oplog temporarily caches write data as well as metadata describing the write data. The metadata includes descriptors to the write data corresponding to offset ranges of the vdisk and are used to identify ranges of write data for the vdisk that are cached in the oplog. To facilitate fast lookup operations of whether write data is cached in the oplog, an oplog index provides a state of the latest data for offset ranges of the vdisk that enables fast failover of metadata used to construct the oplog index in memory without downtime or significant metadata replay.

公开(公告)号：US10802749B2

公开(公告)日：2020-10-13

申请号：US16425022

申请日：2019-05-29

Applicant: Nutanix, Inc.

Inventor： Mohammad Mahmood ,  Anoop Menon ,  Ashwin Thennaram Vakkayil ,  Sandeep Kumar Madanala ,  Shubham Shukla ,  Chern Yih Cheah

IPC: G06F3/06

Abstract: A method commences upon accessing a set of data items that describe computing nodes to be organized into failure-tolerant configuration. The failure-tolerant configuration is characterized by system availability characteristics such as a replication factor and such as a hierarchical distribution of computing nodes. Characteristics of the topology include boundaries that define two or more hierarchically-related availability domain levels. Computing nodes are situated within these boundaries. Instances of a target hierarchical availability domain level are sorted, and instances of a hierarchically lower availability domain level are also sorted to form a multi-level sort order of computing nodes. Computing entities are mapped onto the computing nodes by observing the multi-level sort order.

公开(公告)号：US20220253243A1

公开(公告)日：2022-08-11

申请号：US17218766

申请日：2021-03-31

Applicant: Nutanix, Inc.

Inventor： Alok Nemchand Kataria ,  Niranjan Sanjiv Pendharkar ,  Pete Wyckoff ,  Shubham Shukla ,  Tabrez Parvez Memon

IPC: G06F3/06

Abstract: A technique improves implementation of an index for an operations log (oplog) that coalesces random write operations directed to a virtual disk (vdisk) stored on an extent store. The oplog temporarily caches data associated with the random write operations (i.e., write data) as well as metadata describing the write data. The metadata includes descriptors to the write data stored on virtual address regions, i.e., offset ranges, of the vdisk and are used to identify the offset ranges of write data for the vdisk that are cached in the oplog. To facilitate fast lookup operations of the offset ranges when determining whether write data is cached in the oplog, an oplog index provides a state of the latest data for offset ranges of the vdisk. The technique improves implementation of the oplog index by storing the oplog index in storage class memory, such as persistent memory, to obviate failure and subsequent recovery of the oplog index.

公开(公告)号：US20220244856A1

公开(公告)日：2022-08-04

申请号：US17218465

申请日：2021-03-31

Applicant: Nutanix, Inc.

Inventor： Alok Nemchand Kataria ,  Niranjan Sanjiv Pendharkar ,  Pete Wyckoff ,  Rishi Bhardwaj ,  Rohit Jain ,  Shubham Shukla ,  Tabrez Parvez Memon

IPC: G06F3/06 ,  H04L29/08

Abstract: A technique replicates an index of an operations log (oplog) from a primary node to a secondary node of a cluster in the event of a failure of the primary node. The oplog functions as a staging area to coalesce random write operations directed to a virtual disk (vdisk) stored on a backend storage tier organized as an extent store. The oplog temporarily caches data associated with the random write operations (i.e., write data) as well as metadata describing the write data. The metadata includes descriptors to the write data corresponding to virtual address regions, i.e., offset ranges, of the vdisk and are used to identify the offset ranges of write data for the vdisk that are cached in the oplog. To facilitate fast lookup operations of the offset ranges when determining whether write data io is cached in the oplog, an oplog index provides a state of the latest data for offset ranges of the vdisk. The technique enables fast failover of metadata used to construct the oplog index in memory of a node, such as the secondary node, without downtime or significant metadata replay.

公开(公告)号：US11983438B2

公开(公告)日：2024-05-14

申请号：US17218766

申请日：2021-03-31

Applicant: Nutanix, Inc.

Inventor： Alok Nemchand Kataria ,  Niranjan Sanjiv Pendharkar ,  Pete Wyckoff ,  Shubham Shukla ,  Tabrez Parvez Memon

IPC: G06F12/00 ,  G06F3/06

CPC classification number: G06F3/0659 ,  G06F3/0611 ,  G06F3/0619 ,  G06F3/0664 ,  G06F3/067

Abstract: A technique improves implementation of an index for an operations log (oplog) that coalesces random write operations directed to a virtual disk (vdisk) stored on an extent store. The oplog temporarily caches data associated with the random write operations (i.e., write data) as well as metadata describing the write data. The metadata includes descriptors to the write data stored on virtual address regions, i.e., offset ranges, of the vdisk and are used to identify the offset ranges of write data for the vdisk that are cached in the oplog. To facilitate fast lookup operations of the offset ranges when determining whether write data is cached in the oplog, an oplog index provides a state of the latest data for offset ranges of the vdisk. The technique improves implementation of the oplog index by storing the oplog index in storage class memory, such as persistent memory, to obviate failure and subsequent recovery of the oplog index.