公开(公告)号：US10191674B2

公开(公告)日：2019-01-29

申请号：US15130087

申请日：2016-04-15

Applicant: NetApp, Inc.

Inventor： Prahlad Purohit ,  Vidhyalakshmi Venkitakrishnan ,  Anthony J. Li

IPC: G06F3/06 ,  G06F11/30

Abstract: A consistency checker is configured to perform repairs to one or more multi-level dense tree metadata structures shared between volumes managed by a volume layer of a storage input/output (I/O) stack executing on one or more nodes of a cluster. The volumes include a parent volume and a snapshot and/or clone, wherein the snapshot/clone may be represented as an independent volume, and embodied as a respective read-only copy (snapshot) or read-write copy (clone) of the parent volume. Illustratively, the consistency checker verifies and/or fixes (i.e., repairs) on-disk structures of the volume layer, e.g., the shared dense tree, according to a distributed repair procedure that maintains consistency properties across all volumes in a volume family and avoid cyclic repairs made in the context of different volumes sharing the dense tree.

公开(公告)号：US20170300248A1

公开(公告)日：2017-10-19

申请号：US15130087

申请日：2016-04-15

Applicant: NetApp, Inc.

Inventor： Prahlad Purohit ,  Vidhyalakshmi Venkitakrishnan ,  Anthony J. Li

IPC: G06F3/06 ,  G06F17/30

CPC classification number: G06F3/0619 ,  G06F3/0623 ,  G06F3/0659 ,  G06F3/067 ,  G06F11/30

Abstract: A consistency checker is configured to perform repairs to one or more multi-level dense tree metadata structures shared between volumes managed by a volume layer of a storage input/output (I/O) stack executing on one or more nodes of a cluster. The volumes include a parent volume and a snapshot and/or clone, wherein the snapshot/clone may be represented as an independent volume, and embodied as a respective read-only copy (snapshot) or read-write copy (clone) of the parent volume. Illustratively, the consistency checker verifies and/or fixes (i.e., repairs) on-disk structures of the volume layer, e.g., the shared dense tree, according to a distributed repair procedure that maintains consistency properties across all volumes in a volume family and avoid cyclic repairs made in the context of different volumes sharing the dense tree.