公开(公告)号：US20220342542A1

公开(公告)日：2022-10-27

申请号：US17238613

申请日：2021-04-23

Applicant: EMC IP Holding Company LLC

Inventor： Amitai Alkalay ,  Lior Kamran ,  Steven Morley

IPC: G06F3/06 ,  G06F12/02

Abstract: A method is provided for use in a storage processor, the method comprising: receiving a write request, the write request including a request to store user data in an array that includes a plurality of solid-state drives (SSD); executing the write request by: identifying metadata that is associated with the write request, and writing the user data and the metadata to different data streams that are opened on the plurality of SSDs; wherein writing the user data and the metadata to different data streams causes: (i) the user data to be stored in one or more first erase units of any of the plurality of SSDs, and (ii) the metadata to be stored in one or more second erase units of any of the plurality of SSDs, such that no part of the metadata is stored on any of the one or more first erase units, and no part of the user data is stored on any of the one or more second erase units.

公开(公告)号：US11954346B2

公开(公告)日：2024-04-09

申请号：US17238613

申请日：2021-04-23

Applicant: EMC IP Holding Company LLC

Inventor： Amitai Alkalay ,  Lior Kamran ,  Steven Morley

IPC: G06F3/00 ,  G06F3/06 ,  G06F12/02

CPC classification number: G06F3/064 ,  G06F3/0604 ,  G06F3/0652 ,  G06F3/0689 ,  G06F12/0253 ,  G06F2212/7205

Abstract: A method is provided for use in a storage processor, the method comprising: receiving a write request, the write request including a request to store user data in an array that includes a plurality of solid-state drives (SSD); executing the write request by: identifying metadata that is associated with the write request, and writing the user data and the metadata to different data streams that are opened on the plurality of SSDs; wherein writing the user data and the metadata to different data streams causes: (i) the user data to be stored in one or more first erase units of any of the plurality of SSDs, and (ii) the metadata to be stored in one or more second erase units of any of the plurality of SSDs, such that no part of the metadata is stored on any of the one or more first erase units, and no part of the user data is stored on any of the one or more second erase units.

公开(公告)号：US09959054B1

公开(公告)日：2018-05-01

申请号：US14984060

申请日：2015-12-30

Applicant: EMC IP Holding Company LLC

Inventor： Vamsi Vankamamidi ,  Richard P. Ruef ,  Steven Morley ,  Ryan Gadsby

IPC: G06F3/06 ,  G06F12/0868

CPC classification number: G06F12/0868 ,  G06F3/0616 ,  G06F3/0649 ,  G06F3/0652 ,  G06F3/0685

Abstract: A technique is directed to cleaning a log structure. The technique involves identifying extents (e.g., a contiguous segment of 8 MB) to reclaim from a first storage tier of a set of storage tiers containing the log structure. The technique further involves performing a tier selection operation to select a target storage tier from the set of storage tiers based on a utilization measure of the log structure. The technique further involves, after identifying the extents to reclaim and performing the tier selection operation, storing data from the identified extents into a new extent of the target storage tier and freeing the identified extents. Such a technique combines log cleaning and tiering into a single operation thus placing less stress on storage devices (e.g., less wear on flash memory, etc.), consuming fewer system resources, and providing better performance.

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.