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公开(公告)号：US20230036075A1
公开(公告)日：2023-02-02
申请号：US17938827
申请日：2022-10-07
IPC分类号： G06F12/0804 , G06F12/123
摘要： Provided are a computer program product, system, and method for indicating extents of tracks in mirroring queues based on information gathered on tracks in extents in cache. Extent information on an extent of tracks in a cache indicated in an active cache list is processed in response to destaging a track from the active cache list to add to a demote list used to determine tracks to remove from the cache. The extent information is related to a number of modified tracks in an extent destaged from the active cache list. The extent information for the extent is used to determine one of a plurality of mirroring queues to indicate the extent including modified tracks. A mirroring queue having a higher priority than another mirroring queue is processed at a higher rate to determine extents of tracks to mirror from the cache to the secondary storage.
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公开(公告)号：US11550732B2
公开(公告)日：2023-01-10
申请号：US16798332
申请日：2020-02-22
IPC分类号： G06F12/122 , G06F12/0802
摘要： A method for maintaining statistics for data elements in a cache is disclosed. The method maintains a heterogeneous cache comprising a higher performance portion and a lower performance portion. The method maintains, within the lower performance portion, a ghost cache containing statistics for data elements that are currently contained in the heterogeneous cache, and data elements that have been demoted from the heterogeneous cache within a specified time interval. The method calculates a size of the ghost cache based on an amount of frequently accessed data that is stored in backend storage volumes behind the heterogeneous cache. The method alters the size of the ghost cache as the amount of frequently accessed data changes. A corresponding system and computer program product are also disclosed.
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公开(公告)号：US11494304B2
公开(公告)日：2022-11-08
申请号：US16819038
申请日：2020-03-13
IPC分类号： G06F12/00 , G06F12/0804 , G06F12/123
摘要： Provided are a computer program product, system, and method for indicating extents of tracks in mirroring queues based on information gathered on tracks in extents in cache. Extent information on an extent of tracks in a cache indicated in an active cache list is processed in response to destaging a track from the active cache list to add to a demote list used to determine tracks to remove from the cache. The extent information is related to a number of modified tracks in an extent destaged from the active cache list. The extent information for the extent is used to determine one of a plurality of mirroring queues to indicate the extent including modified tracks. A mirroring queue having a higher priority than another mirroring queue is processed at a higher rate to determine extents of tracks to mirror from the cache to the secondary storage.
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公开(公告)号：US11372761B1
公开(公告)日：2022-06-28
申请号：US17119470
申请日：2020-12-11
IPC分类号： G06F12/00 , G06F12/0846 , G06F3/06
摘要： A method for dynamically adjusting cache memory partition sizes within a storage system includes computing a read hit ratio for data accessed in each cache partition and an average read hit ratio for all the cache partitions over a time interval. The cache memory includes a higher performance portion (DRAM) and lower performance portion (SCM). The method increases or decreases the partition size for each cache partition by comparing the read hit ratio for the partition to the average read hit ratio for all the partitions. Each cache partition includes maximum and minimum partition sizes, and read hit and read access counters. The SCM portion of the cache memory includes cache partitions reserved for storing data of a specific type, or data used for a specific purpose or with a specific software application. A corresponding storage controller and computer program product are also disclosed.
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公开(公告)号：US20220156166A1
公开(公告)日：2022-05-19
申请号：US17649797
申请日：2022-02-02
IPC分类号： G06F11/20 , G06F12/0871 , G06F12/123 , G06F12/0842
摘要： Provided are a computer program product, system, and method for using a track format code in a cache control block for a track in a cache to process read and write requests to the track in the cache. A track format table associates track format codes with track format metadata. A determination is made as to whether the track format table has track format metadata matching track format metadata of a track staged into the cache. A determination is made as to whether a track format code from the track format table for the track format metadata in the track format table matches the track format metadata of the track staged. A cache control block for the track being added to the cache is generated including the determined track format code when the track format table has the matching track format metadata.
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公开(公告)号：US11321201B2
公开(公告)日：2022-05-03
申请号：US16818521
申请日：2020-03-13
IPC分类号： G06F11/20 , G06F11/07 , G06F12/08 , G06F12/12 , G06F11/30 , G06F12/0891 , G06F12/123 , G06F12/0811
摘要： Provided are a computer program product, system, and method for using a mirroring cache list to mirror modified tracks for a primary storage in a cache to a secondary storage. Indication is made of a modified track for the primary storage stored in the cache in a mirroring cache list. The mirroring cache list is processed to select modified tracks in the cache to transfer to the secondary storage that have not yet been transferred. The selected modified tracks are transferred to the secondary storage. Indication of a modified track is removed from the mirroring cache list in response to demoting the modified track from the cache.
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公开(公告)号：US11281594B2
公开(公告)日：2022-03-22
申请号：US16798330
申请日：2020-02-22
IPC分类号： G06F12/128 , G06F12/123 , G06F12/0804
摘要： A method for maintaining statistics for data elements in a cache is disclosed. The method maintains a heterogeneous cache comprising a higher performance portion and a lower performance portion. The method maintains, within the lower performance portion, a ghost cache containing statistics for data elements that are currently contained in the heterogeneous cache, and data elements that have been demoted from the heterogeneous cache within a specified time interval. The method maintains updates to the statistics in an update area within the higher performance portion. The method determines whether the updates have reached a specified threshold and, in the event the updates have reached the specified threshold, flushes the updates from the update area to the ghost cache to update the statistics. A corresponding system and computer program product are also disclosed.
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公开(公告)号：US11263097B2
公开(公告)日：2022-03-01
申请号：US16836827
申请日：2020-03-31
IPC分类号： G06F11/20 , G06F12/0871 , G06F12/123 , G06F12/0842 , G06F11/07
摘要： Provided are a computer program product, system, and method for using a track format code in a cache control block for a track in a cache to process read and write requests to the track in the cache. A track format table associates track format codes with track format metadata. A determination is made as to whether the track format table has track format metadata matching track format metadata of a track staged into the cache. A determination is made as to whether a track format code from the track format table for the track format metadata in the track format table matches the track format metadata of the track staged. A cache control block for the track being added to the cache is generated including the determined track format code when the track format table has the matching track format metadata.
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公开(公告)号：US11243708B2
公开(公告)日：2022-02-08
申请号：US16737877
申请日：2020-01-08
摘要： Provided are a computer program product, system, and method for providing track format information when mirroring updated tracks from a primary storage system to a secondary storage system. The primary storage system determines a track to mirror to the secondary storage system and determines whether there is track format information for the track to mirror. The track format information indicates a format and layout of data in the track, indicated in track metadata for the track. The primary storage system sends the track format information to the secondary storage system, in response to determining there is the track format information and mirrors the track to mirror to the secondary storage system. The secondary storage system uses the track format information for the track in the secondary cache when processing a read or write request to the mirrored track.
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公开(公告)号：US11210227B2
公开(公告)日：2021-12-28
申请号：US16684291
申请日：2019-11-14
IPC分类号： G06F12/0868 , G06F12/0871 , G06F3/06 , G06F12/0891
摘要： A method for demoting data from a cache comprising heterogeneous memory types is disclosed. The method maintains, for a data element in the cache, a write access count that is incremented each time the data element is updated in the cache. The cache includes a higher performance portion and a lower performance portion. The method removes the data element from the higher performance portion in accordance with a cache demotion algorithm. If the data element also resides in the lower performance portion and the write access count is below a first threshold, the method leaves the data element in the lower performance portion. If the data element also resides in the lower performance portion and the write access count is at or above the first threshold, the method removes the data element from the lower performance portion. A corresponding system and computer program product are also disclosed.
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