公开(公告)号：US20170315740A1

公开(公告)日：2017-11-02

申请号：US15143324

申请日：2016-04-29

Applicant: NetApp, Inc.

Inventor： Christopher Joseph Corsi ,  Anshul Pundir ,  Michael L. Federwisch ,  Zhen Zeng

IPC: G06F3/06 ,  G06F13/42

CPC classification number: G06F13/4282 ,  G06F3/061 ,  G06F3/0641 ,  G06F3/0644 ,  G06F3/0688

Abstract: A technique paces and balances a flow of messages related to processing of input/output (I/O) requests between subsystems, such as layers of a storage input/output (I/O) stack, of one or more nodes of a cluster. The I/O requests may be directed to externally-generated user data, e.g., write requests generated by a host coupled to the cluster, and internally-generated metadata, e.g., write and delete requests generated by a volume layer of the storage I/O stack. The user data (and metadata) may be organized as an arbitrary number of variable-length extents of one or more host-visible logical units (LUNs) served by the nodes. The metadata may include mappings from host-visible logical block address ranges (i.e., offset ranges) of a LUN to extent keys, which reference locations of the extents stored on storage devices, such as solid state drivers (SSDs), of a storage array coupled to the nodes. The I/O requests are received at a pacer of the volume layer configured to control delivery of the requests to an extent store layer of the storage I/O stack in a policy-dictated manner to enable processing and sequential storage of the user data and metadata on the SSDs of the storage array.