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1.发明公开公开(公告)号：US20240168677A1
公开(公告)日：2024-05-23
申请号：US17992152
申请日：2022-11-22
申请人： Dell Products L.P.
IPC分类号： G06F3/06
CPC分类号： G06F3/0656 , G06F3/0604 , G06F3/0679
摘要： A data storage system non-disruptively transitions from using a ring-based write log to using a pool-based write log for buffering data being written to persistent secondary storage. The system initially creates the pool-based write log based on contents of the ring-based write log, and begins to mirror updates of the ring-based write log to the pool-based write log to establish synchronism. Subsequently, and based on an update flag indicating that an update process for the system has not yet completed, the system continues to mirror updates of the ring-based write log to the pool-based write log to maintain synchronism therebetween. Subsequently, and based on the update flag indicating that the update process for the system has completed, the system commences exclusive use of the pool-based write log and making the ring-based write log available for eventual removal.
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公开(公告)号：US11989447B1
公开(公告)日：2024-05-21
申请号：US17992152
申请日：2022-11-22
申请人： Dell Products L.P.
IPC分类号： G06F3/06
CPC分类号： G06F3/0656 , G06F3/0604 , G06F3/0679
摘要： A data storage system non-disruptively transitions from using a ring-based write log to using a pool-based write log for buffering data being written to persistent secondary storage. The system initially creates the pool-based write log based on contents of the ring-based write log, and begins to mirror updates of the ring-based write log to the pool-based write log to establish synchronism. Subsequently, and based on an update flag indicating that an update process for the system has not yet completed, the system continues to mirror updates of the ring-based write log to the pool-based write log to maintain synchronism therebetween. Subsequently, and based on the update flag indicating that the update process for the system has completed, the system commences exclusive use of the pool-based write log and making the ring-based write log available for eventual removal.
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公开(公告)号：US20240319925A1
公开(公告)日：2024-09-26
申请号：US18731828
申请日：2024-06-03
申请人： Dell Products L.P.
IPC分类号： G06F3/06
CPC分类号： G06F3/0683 , G06F3/061 , G06F3/0665
摘要： Techniques of the present disclosure can include: identifying blocks of storage available for allocation; generating a list denoting an allocation order of storage chunks of the blocks; receiving a write I/O operation that writes data to a first logical address; allocating a storage chunk in accordance with the allocation order of the list, wherein a first block includes the storage chunk and a second storage chunk; storing the first data in the storage chunk of the first block; removing the second storage chunk from the list; and creating a mapping between the first logical address and the first block indicating the second storage chunk is reserved for storing content written to a logical address included in a volume logical address range comprising the first logical address. The allocation order can spread allocation distance between blocks and chunks of the same block to avoid contention during flushes.
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公开(公告)号：US11782842B1
公开(公告)日：2023-10-10
申请号：US17722696
申请日：2022-04-18
申请人： Dell Products L.P.
发明人： Ami Sabo , Oran Baruch , Vamsi K. Vankamamidi
IPC分类号： G06F12/0891 , G06F12/02
CPC分类号： G06F12/0891 , G06F12/0246 , G06F2212/2022
摘要： In a log based system, a reclamation list of cache pages containing dirty data can be maintained and used. The cached dirty data pages identified by the reclamation list can be candidates for eviction from the cache. A cached dirty data page on the reclamation list can be persistently logged in a transaction log extension having storage allocated from a non-volatile solid state drive (SSD). The reclamation list can include descriptors of the cached dirty data pages prioritized for eviction in accordance with a least recently used (LRU) policy so that the LRU cached dirty data page can be selected for eviction. When a dirty data page which was evicted from the cache is reloaded into cache, the dirty data page can be added to the reclamation list by adding its page descriptor to the reclamation list. A dirty data page can be removed from the reclamation list once flushed.
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公开(公告)号：US12045517B1
公开(公告)日：2024-07-23
申请号：US18094116
申请日：2023-01-06
申请人： Dell Products L.P.
IPC分类号： G06F3/06
CPC分类号： G06F3/0683 , G06F3/061 , G06F3/0665
摘要： Techniques of the present disclosure can include: identifying blocks of storage available for allocation; generating a list denoting an allocation order of storage chunks of the blocks; receiving a write I/O operation that writes data to a first logical address; allocating a storage chunk in accordance with the allocation order of the list, wherein a first block includes the storage chunk and a second storage chunk; storing the first data in the storage chunk of the first block; removing the second storage chunk from the list; and creating a mapping between the first logical address and the first block indicating the second storage chunk is reserved for storing content written to a logical address included in a volume logical address range comprising the first logical address. The allocation order can spread allocation distance between blocks and chunks of the same block to avoid contention during flushes.
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公开(公告)号：US11994999B2
公开(公告)日：2024-05-28
申请号：US17869892
申请日：2022-07-21
申请人： Dell Products L.P.
IPC分类号： G06F12/08 , G06F12/0891
CPC分类号： G06F12/0891 , G06F2212/1024
摘要： A method, computer program product, and computing system for generating a page buffer pool within a data journal of a storage node. A plurality of IO operations may be processed on a storage array using the storage node. A plurality of pages may be persisted in a plurality of page buffers within the page buffer pool based upon, at least in part, the processing of the plurality of IO operations. For each page buffer in the page buffer pool, a hash of the page buffer may be generated, thus defining a page buffer hash. The page buffer hash may be stored in a page descriptor associated with the page buffer.
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7.发明授权公开(公告)号：US11663080B1
公开(公告)日：2023-05-30
申请号：US17579866
申请日：2022-01-20
申请人： Dell Products L.P.
CPC分类号： G06F11/1084 , G06F3/064 , G06F3/0619 , G06F3/0659 , G06F3/0689 , G06F11/0772 , G06F11/1092 , G06F11/1435
摘要： Techniques for rebuilding data in a data storage system are provided. A method includes: (a) identifying (i) a first set of degraded Ubers that contain no portions reserved for direct writing and (ii) a second set of degraded Ubers that contain at least one portion reserved for direct writing. Direct writing is a process that writes blocks to long-term storage prior to mapping those blocks in a metadata mapping structure. An Uber is a set of adjacent stripes across a respective Redundant Array of Independent Disks (RAID) array of the data storage system, and a degraded Uber is an Uber that includes at least one failed drive within its RAID array. The method further includes (b) initiating a rebuild of the first set of degraded Ubers; and (c) delaying a rebuild of each degraded Uber of the second set until all pending direct writes to blocks of that degraded Uber have been mapped by the metadata mapping structure.
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8.发明公开公开(公告)号：US20240241675A1
公开(公告)日：2024-07-18
申请号：US18094116
申请日：2023-01-06
申请人： Dell Products L.P.
IPC分类号： G06F12/1009
CPC分类号： G06F12/1009 , G06F2212/1024
摘要： Techniques of the present disclosure can include: identifying blocks of storage available for allocation; generating a list denoting an allocation order of storage chunks of the blocks; receiving a write I/O operation that writes data to a first logical address; allocating a storage chunk in accordance with the allocation order of the list, wherein a first block includes the storage chunk and a second storage chunk; storing the first data in the storage chunk of the first block; removing the second storage chunk from the list; and creating a mapping between the first logical address and the first block indicating the second storage chunk is reserved for storing content written to a logical address included in a volume logical address range comprising the first logical address. The allocation order can spread allocation distance between blocks and chunks of the same block to avoid contention during flushes.
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公开(公告)号：US20240028520A1
公开(公告)日：2024-01-25
申请号：US17869892
申请日：2022-07-21
申请人： Dell Products L.P.
IPC分类号： G06F12/0891
CPC分类号： G06F12/0891 , G06F2212/1024
摘要： A method, computer program product, and computing system for generating a page buffer pool within a data journal of a storage node. A plurality of TO operations may be processed on a storage array using the storage node. A plurality of pages may be persisted in a plurality of page buffers within the page buffer pool based upon, at least in part, the processing of the plurality of TO operations. For each page buffer in the page buffer pool, a hash of the page buffer may be generated, thus defining a page buffer hash. The page buffer hash may be stored in a page descriptor associated with the page buffer.
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公开(公告)号：US20230333986A1
公开(公告)日：2023-10-19
申请号：US17722696
申请日：2022-04-18
申请人： Dell Products L.P.
发明人： Ami Sabo , Oran Baruch , Vamsi K. Vankamamidi
IPC分类号： G06F12/0891 , G06F12/02
CPC分类号： G06F12/0891 , G06F12/0246 , G06F2212/2022
摘要： In a log based system, a reclamation list of cache pages containing dirty data can be maintained and used. The cached dirty data pages identified by the reclamation list can be candidates for eviction from the cache. A cached dirty data page on the reclamation list can be persistently logged in a transaction log extension having storage allocated from a non-volatile solid state drive (SSD). The reclamation list can include descriptors of the cached dirty data pages prioritized for eviction in accordance with a least recently used (LRU) policy so that the LRU cached dirty data page can be selected for eviction. When a dirty data page which was evicted from the cache is reloaded into cache, the dirty data page can be added to the reclamation list by adding its page descriptor to the reclamation list. A dirty data page can be removed from the reclamation list once flushed.
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