公开(公告)号：US11086562B2

公开(公告)日：2021-08-10

申请号：US16086292

申请日：2016-09-13

申请人： Hitachi, Ltd.

发明人： Ryosuke Tatsumi ,  Tomohiro Yoshihara

IPC分类号： G06F3/06 ,  G06F12/02

摘要： In a case where updated data using a first logical address as a write destination and existing data using a second logical address as a write destination duplicate with each other, a computer system writes predetermined data instead of updated data to a memory segment associated with a first physical address, and dynamically maps the first logical address to a second physical address. The computer system transmits a write command of the predetermined data or an unmapping command that designates a virtual address that complies with the first physical address, to a storage device that corresponds to the first physical address. The first and second logical addresses are logical addresses that belong to a logical address range which is at least a part of a logical address space. The first physical address is a physical address that belongs to a physical address range which is at least a part of a physical address space, and is a physical address statically mapped to the first logical address.

公开(公告)号：US10884924B2

公开(公告)日：2021-01-05

申请号：US15547984

申请日：2015-03-04

申请人： Hitachi, Ltd.

发明人： Shintaro Ito ,  Akira Yamamoto ,  Ryosuke Tatsumi ,  Takanobu Suzuki

IPC分类号： G06F12/08 ,  G06F3/06 ,  G06F12/0804 ,  G06F13/10 ,  G06F12/109

摘要： A storage system receives a write request which specifies a logical volume address associated with a RAID group, and makes a first determination whether write target data in accordance with the write request exists in a cache memory. When the first determination result is negative, the storage system makes a second determination whether at least one of one or more conditions is met, the condition being that random write throughput performance is expected to increase by asynchronous de-staging processing of storing the write target data in the RAID group asynchronously to write processing performed in response to the write request. When the second determination result is negative, the storage system selects, for the write request, synchronous storage processing, which is processing of storing the write target data in the RAID group in the write processing and for which a load on a processor is lower than the asynchronous de-staging processing.

公开(公告)号：US10739999B2

公开(公告)日：2020-08-11

申请号：US16119589

申请日：2018-08-31

申请人： HITACHI, LTD.

发明人： Ryosuke Tatsumi ,  Yoshihiro Yoshii

IPC分类号： G06F3/06 ,  G06F12/02

摘要： A computer system connected to an external computer issuing a data input/output request and a storage device, includes a logical storage area of a first layer of the storage device and a logical storage area of a second layer of the external computer. The logical storage area of the first layer includes a common area and an individual area. A storage area of the common area is associated with one or more of the second layer's logical storage areas. A storage area of the individual area is associated with one storage area of the second layer's logical storage area. The computer system performs duplication determination on a plurality of data sets and associates a plurality of data sets determined as being duplicated with the common area to associate the storage area of the common area with a plurality of storage areas of the logical storage area of the second layer.

公开(公告)号：US09977813B2

公开(公告)日：2018-05-22

申请号：US14651688

申请日：2013-01-17

申请人： Hitachi, Ltd.

发明人： Ryosuke Tatsumi ,  Tadato Nishina ,  Norio Shimozono

IPC分类号： G06F17/30 ,  G06F3/06

CPC分类号： G06F17/30371 ,  G06F3/0608 ,  G06F3/0647 ,  G06F3/067 ,  G06F17/30368 ,  G06F17/30876

摘要： As a method for migrating data of a volume adopting a snapshot function to a new storage system, in order to perform migration without depending on a method for compressing snapshot data of a migration source storage system, and without stopping transmission and reception of data between the host computer and the storage system, at first, after migrating data of a volume being the source of snapshot (PVOL), migration is performed sequentially from newer generations. At this time, migration target data of each SVOL is all the data within the migration source storage system. The SVOL data copied to a migration destination storage is compared with one-generation-newer SVOL data within the migration destination storage system, and based on the comparison result, a difference management information is created. If there is difference, a VOL allocation management table is updated, and difference data is stored in the area allocated within the pool.