公开(公告)号：US09983896B1

公开(公告)日：2018-05-29

申请号：US14985960

申请日：2015-12-31

Applicant: EMC IP Holding Company LLC

Inventor： Dilesh Naik ,  Shuyu Lee ,  Jean Schiff ,  David W. Harvey

IPC: G06F9/455 ,  G06F3/06

CPC classification number: G06F9/45558 ,  G06F3/0608 ,  G06F3/0664 ,  G06F3/0683 ,  G06F2009/45583

Abstract: A method includes (a) receiving a setup command directing a computing device to create a protocol endpoint to allow a remote host device to access storage volumes of the computing device presented to the remote host through the protocol endpoint as virtual storage volumes, (b) in response to receiving the setup command, creating a logical storage device object representing the protocol endpoint, the logical storage device object having zero underlying storage capacity, (c) subsequent to creating the logical storage device object, receiving a command directed at the protocol endpoint, and (d) in response to receiving the command, processing the command by a driver stack on the computing device containing the logical storage device object representing the protocol endpoint, the driver stack being shorter than another driver stack on the computing device used to process storage commands directed at another logical storage device object having non-zero underlying storage.

公开(公告)号：US09921912B1

公开(公告)日：2018-03-20

申请号：US14870187

申请日：2015-09-30

Applicant: EMC IP Holding Company LLC

Inventor： Vamsi Vankamamidi ,  Ryan Gadsby ,  Thomas E. Linnell ,  David W. Harvey ,  Daniel Cummins ,  Steven Morley

IPC: G06F11/00 ,  G06F11/10 ,  G06F3/06

CPC classification number: G06F11/1092

Abstract: A technique for managing spare disk drives in a data storage system includes transferring segments of data from disk drives of an operating RAID group to spare regions on a set of spare disk drives to create unused space in the disk drives of the RAID group, thus using the spare regions to overprovision storage in the RAID group. Upon a failure of one of the disk drives in the RAID group, data of the failing disk drive are rebuilt based on the segments of data as well as on data from still-functioning disk drives in the RAID group. Thus, the spare disk drives act not only to overprovision storage for the RAID group prior to disk drive failure, but also to fulfill their role as spares in the event of a disk drive failure.

公开(公告)号：US10303396B1

公开(公告)日：2019-05-28

申请号：US15789127

申请日：2017-10-20

Applicant: EMC IP Holding Company LLC

Inventor： David W. Harvey

IPC: G06F12/00 ,  G06F3/06

Abstract: Described are techniques for processing read and write requests in a system having a NUMA (non-uniform memory access) configuration. Such techniques may include receiving, at a front end adapter of the system, a write request, to write first data to a first storage device, storing a first copy of the first data in first memory local to a first domain, copying, using a first inter-storage processor communication connection, the first data from the first memory to a third memory of a third domain thereby creating a second copy of the first data in the third memory; and determining, in accordance with a first heuristic and first criteria, whether to use the first copy of the first data stored in the first memory or the second copy of the first data stored in the third memory as a source when writing the first data to the first storage device.

公开(公告)号：US09817607B1

公开(公告)日：2017-11-14

申请号：US14310179

申请日：2014-06-20

Applicant: EMC IP Holding Company LLC

Inventor： David W. Harvey

IPC: G06F12/00 ,  G06F3/06

CPC classification number: G06F3/0689 ,  G06F3/061 ,  G06F3/0635 ,  G06F3/0656 ,  G06F12/08

Abstract: Described are techniques for processing read and write requests in a system having a NUMA (non-uniform memory access) configuration. Such techniques may include receiving, at a front end adapter of the system, a write request, to write first data to a first storage device, storing a first copy of the first data in first memory local to a first domain, copying, using a first inter-storage processor communication connection, the first data from the first memory to a third memory of a third domain thereby creating a second copy of the first data in the third memory; and determining, in accordance with a first heuristic and first criteria, whether to use the first copy of the first data stored in the first memory or the second copy of the first data stored in the third memory as a source when writing the first data to the first storage device.

公开(公告)号：US09940280B1

公开(公告)日：2018-04-10

申请号：US14751666

申请日：2015-06-26

Applicant: EMC IP Holding Company LLC

Inventor： Walter O'Brien ,  David W. Harvey ,  Robert W. Beauchamp ,  Steven D. Sardella ,  Antonio L. Fontes

IPC: G06F13/36 ,  G06F13/00 ,  G06F13/40 ,  G06F11/07 ,  G06F11/20 ,  G06F11/10 ,  G06F3/06 ,  G06F13/38

CPC classification number: G06F13/4022 ,  G06F11/0787 ,  G06F11/1088 ,  G06F11/2056 ,  G06F13/382

Abstract: An electronic assembly perform data storage operations on behalf of a set of storage processors (SPs). The electronic assembly includes an enclosure, and a set of peripheral component interconnect express (PCIe) switches which installs within the enclosure. The set of PCIe switches is constructed and arranged to connect to the set of SPs while the set of SPs is external to the enclosure. The electronic assembly further includes a set of data storage devices which installs within the enclosure. The set of data storage devices is constructed and arranged to persistently store data on behalf of the set of SPs via PCIe-based communications through the set of PCIe switches.