公开(公告)号：US11573738B2

公开(公告)日：2023-02-07

申请号：US17151794

申请日：2021-01-19

Applicant: EMC IP HOLDING COMPANY LLC

Inventor： Lixin Pang ,  Rong Yu ,  Peng Wu ,  Shao Hu ,  Mohammed Asher Vt

IPC: G06F3/06

Abstract: A synchronous destage process is used to move data from shared global memory to back-end storage resources. The synchronous destage process is implemented using a client-server model between a data service layer (client) and back-end disk array of a storage system (server). The data service layer initiates a synchronous destage operation by requesting that the back-end disk array move data from one or more slots of global memory to back-end storage resources. The back-end disk array services the request and notifies the data service layer of the status of the destage operation, e.g. a destage success or destage failure. If the destage operation is a success, the data service layer updates metadata to identify the location of the data on back-end storage resources. If the destage operation is not successful, the data service layer re-initiates the destage process by issuing a subsequent destage request to the back-end disk array.

公开(公告)号：US11526447B1

公开(公告)日：2022-12-13

申请号：US17363167

申请日：2021-06-30

Applicant: EMC IP HOLDING COMPANY LLC

Inventor： Peng Wu ,  Rong Yu ,  Jiahui Wang ,  Lixin Pang

IPC: G06F12/0844 ,  G06F3/06

Abstract: A data service layer running on a storage director node generates a request to destage host data from a plurality of cache slots in a single back-end track. The destage request includes pointers to addresses of the cache slots and indicates an order in which the host application data in the cache slots is to be included in the back-end track. A back-end redundant array of independent drives (RAID) subsystem running on a drive adapter is responsive to the request to calculate parity information using the host application data in the cache slots. The back-end RAID subsystem assembles the single back-end track comprising the host application data from the plurality of cache slots of the request, and destages the single back-end track to a non-volatile drive in a single back-end input-output (IO) operation.

公开(公告)号：US20220229589A1

公开(公告)日：2022-07-21

申请号：US17151794

申请日：2021-01-19

Applicant: EMC IP HOLDING COMPANY LLC

Inventor： Lixin Pang ,  Rong Yu ,  Peng Wu ,  Shao Hu ,  Mohammed Asher VT

IPC: G06F3/06

Abstract: A synchronous destage process is used to move data from shared global memory to back-end storage resources. The synchronous destage process is implemented using a client-server model between a data service layer (client) and back-end disk array of a storage system (server). The data service layer initiates a synchronous destage operation by requesting that the back-end disk array move data from one or more slots of global memory to back-end storage resources. The back-end disk array services the request and notifies the data service layer of the status of the destage operation, e.g. a destage success or destage failure. If the destage operation is a success, the data service layer updates metadata to identify the location of the data on back-end storage resources. If the destage operation is not successful, the data service layer re-initiates the destage process by issuing a subsequent destage request to the back-end disk array.

公开(公告)号：US11372562B1

公开(公告)日：2022-06-28

申请号：US17225170

申请日：2021-04-08

Applicant: EMC IP HOLDING COMPANY LLC

Inventor： Peng Wu ,  Rong Yu ,  Jiahui Wang ,  Lixin Pang

IPC: G06F3/06

Abstract: A storage system that supports multiple RAID levels presents storage objects with front-end tracks corresponding to back-end tracks on non-volatile drives and accesses the drives using a single type of back-end allocation unit that is larger than a back-end track. When the number of members of a protection group of a RAID level does not align with the back-end allocation unit, multiple back-end tracks are grouped and accessed using a single IO. The number of back-end tracks in a group is selected to align with the back-end allocation unit size. If the front-end tracks are variable size, then front-end tracks may be destaged into a smaller number of grouped back-end tracks in a single IO.

公开(公告)号：US11321178B1

公开(公告)日：2022-05-03

申请号：US17361401

申请日：2021-06-29

Applicant: EMC IP HOLDING COMPANY LLC

Inventor： Rong Yu ,  Peng Wu ,  Shao Hu ,  Lixin Pang

IPC: G06F11/10 ,  G06F11/07 ,  G06F11/14

Abstract: Occurrence of a RAID double failure in a slice of a RAID protection group (failed slice) renders data stored in the back-end tracks of the failed slice vulnerable to loss. When a RAID double failure is detected, a new slice is added to the RAID protection group. Front-end tracks that map to the good back-end tracks of the failed slice are moved from the back-end tracks of the failed slice to the back-end tracks of the newly added slice. Any front-end tracks that mapped to the bad back-end tracks of the failed slice are made to be write pending and written to corresponding back-end tracks of the newly added slice. Front-end tracks that map to the bad back-end tracks may be made to be write-pending in connection with a host write operation, by reading the front-end tracks from a local backup, or from a remote backup location.

公开(公告)号：US11256447B1

公开(公告)日：2022-02-22

申请号：US17065558

申请日：2020-10-08

Applicant: EMC IP HOLDING COMPANY LLC

Inventor： Lixin Pang ,  Jiahui Wang ,  Peng Wu ,  Rong Yu

IPC: G06F11/10 ,  G06F11/20 ,  G06F3/06 ,  H04L67/1097

Abstract: A storage array that presents a logical storage device to hosts that is accessed using front-end tracks and access tangible managed drive using back-end tracks locates multiple front-end tracks in individual back-end tracks. Error-correcting codes are used to identify different front-end tracks in a back-end track when the back-end track is copied from the managed drives into storage array memory. CKD front-end tracks can be split into multiple partial CKD front-end tracks that are located at contiguous address space in different back-end tracks. The front-end tracks that are located in a particular back-end track may be selected to reduce or minimize unused space. The front-end tracks in a back-end track may be logically stored on different production volumes.