Robert E Foley

US Patent:

8380926, Feb 19, 2013

Filed:

Mar 31, 2010

Appl. No.:

12/751783

Inventors:

Robert P. Foley - Clinton MA, US
Ronald D. Proulx - Boxborough MA, US
Adi Ofer - Sunnyvale CA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 12/00

US Classification:

711114, 711E12078

Abstract:

A method is used in handling sector edges. Input/output (I/O) requests to a storage device are handled. The I/O requests use a different sector size format than that of the storage device. An I/O request is received for a write operation at a logical address of a virtual device. The write operation specifies new data to be written to the virtual device. A logical sector associated with the logical address is determined. The logical sector is mapped to a portion of a physical sector of the storage device. The sector edge of the physical sector is read into a RAID-protected memory. The read sector edge is written together with the new data to the storage device.

US Patent:

20210342071, Nov 4, 2021

Filed:

Jul 14, 2021

Appl. No.:

17/305752

Inventors:

- Shenzhen, CN
Robert Foley - Clinton MA, US

International Classification:

G06F 3/06

Abstract:

A computer-implemented method for remote direct memory access (RDMA) by a distributed storage node includes receiving a request for an input/output (I/O) process associated with data. In response to the request, a memory segment shared between the operating system and a user process is allocated using an operating system driver of the node. The user process includes an I/O stack for processing the request. The shared memory segment includes a context memory portion storing context information associated with the I/O stack, a header memory portion storing header information for the I/O process, and a data memory portion for storing the data. The shared memory segment is registered for RDMA access with a target storage node. An RDMA transfer is performed between the shared memory segment and the target node to complete the I/O process. The shared memory segment is deallocated upon completion of the RDMA transfer.

US Patent:

20190286523, Sep 19, 2019

Filed:

Jun 5, 2019

Appl. No.:

16/432680

Inventors:

- Hopkinton MA, US
Robert Foley - Clinton MA, US
Daniel Cummins - Hudson NJ, US
Socheavy Heng - Framingham MA, US

Assignee:

EMC IP Holding Company LLC - Hopkinton MA

International Classification:

G06F 11/10

Abstract:

Disclosed herein are techniques for use in managing data storage. For example, in one embodiment, the techniques comprise determining a size of the write request. The size of the write request equating to half or more non-parity data portions in a full stripe of data but less than all non-parity data portions in the full stripe. The techniques comprise performing a process based on the size that includes reading a parity and one or more missing non-parity data portions in the full stripe, verifying the coherency of the missing non-parity data portions by comparing a checksum of the parity and a checksum of the missing non-parity data portions, determining a new parity based on the new data and the missing non-parity data portions, and writing, in response to verifying the coherency of the missing non-parity data portions, the new data and the new parity to a RAID group without writing the one or more missing non-parity data portions to the RAID group, wherein the new data and the new parity are written to the RAID group with a checksum.