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公开(公告)号：US20250094392A1
公开(公告)日：2025-03-20
申请号：US18596881
申请日：2024-03-06
Applicant: Hitachi, Ltd.
Inventor： Hiroki FUJII , Takahiro YAMAMOTO , Akira DEGUCHI
Abstract: To migrate a volume while maintaining a pair. A first node includes a primary volume. A second node includes a secondary volume configured to create a remote copy pair with the primary volume and sets the remote copy using identification information on the primary volume and identification information on the secondary volume. A third node includes a migration destination volume to be a migration destination of the secondary volume. The first node receives a new pair creating request in which the identification information on the volume, the primary identification information on the secondary volume, and information specifying the third node are designated, and creates a new pair between the primary volume and the migration destination volume. The second node deletes the pair of the secondary volume and the primary volume and replaces the identification information on the migration destination volume with the identification information on the secondary volume.
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公开(公告)号：US20230244387A1
公开(公告)日：2023-08-03
申请号：US17902767
申请日：2022-09-02
Applicant: Hitachi, Ltd.
Inventor： Ryo HANAFUSA , Tomohiro YOSHIHARA , Ryosuke TATSUMI , Hiroki FUJII
IPC: G06F3/06
CPC classification number: G06F3/0619 , G06F3/0683 , G06F3/0653 , G06F3/0659
Abstract: A storage system comprises nodes and drives, and includes at least one mounting area to install the drives. A node manages a parity group constituted of the plurality of drives; generates, in a case where a target drive that is installed in a first mounting area and that belongs to a first parity group is to be moved from the first mounting area to a second mounting area, difference information regarding a storage area where data was written into the target drive during a period in which the target drive is moved from the first mounting area to the second mounting area; and restore data written into the storage area by using data stored in other drives than the target drive that belongs to the first parity group based on the difference information, and write the data into the target drive that has been moved to the second mounting area.
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公开(公告)号：US20230214134A1
公开(公告)日：2023-07-06
申请号：US17939789
申请日：2022-09-07
Applicant: Hitachi, Ltd.
Inventor： Takashi NAGAO , Tomohiro YOSHIHARA , Hiroki FUJII
IPC: G06F3/06
CPC classification number: G06F3/0622 , G06F3/0619 , G06F3/0631 , G06F3/0665 , G06F3/0683
Abstract: A storage controller manages a logical volume to which a host makes an access and which manages host data, an addition address space which is mapped with the logical volume and to which host data is added, and a physical address space which is mapped with the addition address space. In the addition address space, different address regions are allocated to respective parity groups. The storage controller selects, as an addition area of host data supplied from the host, an unoccupied address region in the addition address space. As the addition area, a region mapped to a normal status parity group in which data recovery is unnecessary is more preferentially selected than a region allocated to an abnormal status parity group in which data recovery is necessary.
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公开(公告)号：US20210181958A1
公开(公告)日：2021-06-17
申请号：US17022810
申请日：2020-09-16
Applicant: HITACHI, LTD.
Inventor： Hiroki FUJII , Yoshinori OHIRA , Takeru CHIBA , Yoshiaki DEGUCHI
IPC: G06F3/06
Abstract: Provided is a storage system and a storage management method, aiming at reducing data movement amount necessary for using an expanded capacity in a distributed RAID. When only A (A is a positive integer) physical storage drives are added, a storage controller selects virtual parcels that are mapped to different physical storage drives among N physical storage drives and are included in different virtual chunks, changes an arrangement of the selected virtual parcels to the added A physical storage drives, and constitutes a new chunk based on unallocated virtual parcels selected from different physical storage drives among the (N+A) physical storage drives.
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公开(公告)号：US20220283938A1
公开(公告)日：2022-09-08
申请号：US17471968
申请日：2021-09-10
Applicant: Hitachi, Ltd.
Inventor： Hiroki FUJII , Yoshinori OHIRA , Takeru CHIBA , Akira DEGUCHI
Abstract: Element data stored in a selected virtual device is moved to another virtual device, a virtual parcel allocated to a specific physical device is allocated to a plurality of unallocated areas located in different physical devices, which are mapped to the virtual parcel in which the data is unstored by moving the element data, and all the specific physical devices are brought into an unallocated state.
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Patent Agency Ranking
公开(公告)号：US20210382788A1
公开(公告)日：2021-12-09
申请号：US17201151
申请日：2021-03-15
Applicant: Hitachi, Ltd.
Inventor： Takeru CHIBA , Hiroki FUJII , Yoshiaki DEGUCHI
Abstract: A storage system including a storage controller and a plurality of storage drives generates parity data from data. Data and parity data configure a stripe. A plurality of stripes configure a parity group allocated with a plurality of storage drives to store the parity group. A first parity group allows the number of storage drives allocated to the parity group to be equal to the number of data pieces configuring each stripe. A second parity group allows the number of storage drives allocated to the parity group to be larger than the number of data pieces configuring each stripe and allows data for each stripe to be distributed and stored in different combinations of storage drives. When the first parity group is converted to the second parity group, a storage drive is added so that it is allocated to the parity group. Data is moved to ensure a free area.
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公开(公告)号：US20240419744A1
公开(公告)日：2024-12-19
申请号：US18597166
申请日：2024-03-06
Applicant: Hitachi, Ltd.
Inventor： Hideyuki KOSEKI , Akira DEGUCHI , Hiroki FUJII
IPC: G06F16/951
Abstract: When data is to be stored in or transferred to a storage system including a controller, the controller causes a selected offload instance to compress or to decompress the data to be stored in or to be transferred to the storage system, the selected offload instance being one or more offload instances that support a specific compression scheme and to which a compression or decompression load is to be offloaded.
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公开(公告)号：US20230393948A1
公开(公告)日：2023-12-07
申请号：US18178977
申请日：2023-03-06
Applicant: Hitachi, Ltd.
Inventor： Hiroki FUJII , Masahiro ARAI , Akira DEGUCHI
IPC: G06F11/14
CPC classification number: G06F11/1464 , G06F11/1469 , G06F2201/84
Abstract: Acquiring a snapshot of a logical volume involves generating snapshot-related catalog information including at least a location for storing actual data in the snapshot and a reference destination for identifying another snapshot in parent-child relation to the snapshot, and storing the actual data in the snapshot to the physical storage device and/or to the cloud service. In a case where at least one of a plurality of snapshots is to be designated and restored, catalog information is referenced to identify the storage location of the actual data and acquire the actual data stored in the physical storage device and the actual data not stored in the physical storage device from the cloud service.
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公开(公告)号：US20220236882A1
公开(公告)日：2022-07-28
申请号：US17477308
申请日：2021-09-16
Applicant: Hitachi, Ltd.
Inventor： Hideyuki KOSEKI , Hiroki FUJII , Akira DEGUCHI , Akira YAMAMOTO
Abstract: The efficiency of the maintenance of a storage apparatus including a plurality of flash drives can be enhanced.
In a storage apparatus including a plurality of SSDs and a CPU, the CPU specifies, based on lifetimes of the SSDs depending on amounts of data written to the SSDs, the SSD to be replaced on a scheduled maintenance date, gives notice of the SSD specified to be replaced, and copies data in the SSD to be replaced to another SSD by the scheduled maintenance date on which the replacement is to be performed.-
公开(公告)号：US20210191828A1
公开(公告)日：2021-06-24
申请号：US17029297
申请日：2020-09-23
Applicant: Hitachi, Ltd.
Inventor： Sho SAWADA , Hidenori SUZUKI , Eiju KATSURAGI , Shintarou INOUE , Hiroki FUJII
Abstract: A storage controller of a storage system performs, when failures occur in at least two drives, priority rebuilding and normal rebuilding in parallel, the priority rebuilding being performed so as to perform rebuilding using a reading drive for reading data for restoration of priority rebuild data to be preferentially rebuilt and a writing drive specified for writing the priority rebuild data restored, the normal rebuilding being performed so as to rebuilt normal rebuild data by using a specified reading drive and a specified writing drive.
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