公开(公告)号：US10235059B2

公开(公告)日：2019-03-19

申请号：US14955973

申请日：2015-12-01

Applicant: NetApp, Inc.

Inventor： Chaitanya Patel ,  Shailesh Ajay Shiwalkar

IPC: G06F11/00 ,  G06F3/06 ,  G06F11/20 ,  G06F11/36

Abstract: A technique maintains consistent throughput of processing of input/output (I/O) requests by a storage system when changing configuration of one or more Redundant Array of Independent Disks (RAID) groups of storage devices, such as disks, within the storage system. The configuration of a RAID group (i.e., RAID configuration) may be represented by RAID objects (e.g., reference-counted data structures) stored in a memory of the storage system. Illustratively, the RAID objects may be organized as a RAID configuration hierarchy including a top-level RAID object (e.g., RAID group data structure) that is linked (e.g., via one or more pointers) to one or more intermediate-level RAID objects (e.g., disk and segment data structures) which, in turn, are linked to one or more low-level RAID objects (e.g., chunk data structures). According to the technique, a snapshot of a current RAID configuration (i.e., current configuration snapshot) may be created by incrementing a reference count of the current top-level object of the hierarchy and attaching (e.g., via a pointer) the current configuration snapshot to a current I/O request processed by the storage system.

公开(公告)号：US20170153829A1

公开(公告)日：2017-06-01

申请号：US14955973

申请日：2015-12-01

Applicant: NetApp, Inc.

Inventor： Chaitanya Patel ,  Shailesh Ajay Shiwalkar

IPC: G06F3/06 ,  G06F11/20

CPC classification number: G06F3/0619 ,  G06F3/061 ,  G06F3/065 ,  G06F3/0688 ,  G06F3/0689 ,  G06F11/00 ,  G06F11/2094 ,  G06F11/3668 ,  G06F2201/805 ,  G06F2201/84

Abstract: A technique maintains consistent throughput of processing of input/output (I/O) requests by a storage system when changing configuration of one or more Redundant Array of Independent Disks (RAID) groups of storage devices, such as disks, within the storage system. The configuration of a RAID group (i.e., RAID configuration) may be represented by RAID objects (e.g., reference-counted data structures) stored in a memory of the storage system. Illustratively, the RAID objects may be organized as a RAID configuration hierarchy including a top-level RAID object (e.g., RAID group data structure) that is linked (e.g., via one or more pointers) to one or more intermediate-level RAID objects (e.g., disk and segment data structures) which, in turn, are linked to one or more low-level RAID objects (e.g., chunk data structures). According to the technique, a snapshot of a current RAID configuration (i.e., current configuration snapshot) may be created by incrementing a reference count of the current top-level object of the hierarchy and attaching (e.g., via a pointer) the current configuration snapshot to a current I/O request processed by the storage system.