Abstract:
A cache and/or storage module may be configured to reduce write amplification in a cache storage. Cache layer write amplification (CLWA) may occur due to an over-permissive admission policy. The cache module may be configured to reduce CLWA by configuring admission policies to avoid unnecessary writes. Admission policies may be predicated on access and/or sequentiality metrics. Flash layer write amplification (FLWA) may arise due to the write-once properties of the storage medium. FLWA may be reduced by delegating cache eviction functionality to the underlying storage layer. The cache and storage layers may be configured to communicate coordination information, which may be leveraged to improve the performance of cache and/or storage operations.
Abstract:
A storage module may be configured to service I/O requests according to different persistence levels. The persistence level of an I/O request may relate to the storage resource(s) used to service the I/O request, the configuration of the storage resource(s), the storage mode of the resources, and so on. In some embodiments, a persistence level may relate to a cache mode of an I/O request. I/O requests pertaining to temporary or disposable data may be serviced using an ephemeral cache mode. An ephemeral cache mode may comprise storing I/O request data in cache storage without writing the data through (or back) to primary storage. Ephemeral cache data may be transferred between hosts in response to virtual machine migration.
Abstract:
Apparatuses, systems, methods, and computer program products are disclosed for hybrid checkpointed memory. A method includes referencing data of a range of virtual memory of a host. The referenced data is already stored by a non-volatile medium. A method includes writing, to a non-volatile medium, data of a range of virtual memory that is not stored by the non-volatile medium. A method includes providing access to data of a range of virtual memory from a non-volatile medium using a persistent identifier associated with referenced data and written data.
Abstract:
An apparatus and system are disclosed for a storage area network (“SAN”). In one embodiment, a computer system includes an internal storage device and an internal storage controller. In this embodiment, the internal storage controller is configured to implement a SAN that includes at least the internal storage device and a storage device external to the computer system. In this embodiment, the internal storage controller is further configured to service a storage request received from a client that involves data stored by the internal storage device. In this embodiment, the internal storage controller is configured to communicate with the external storage device via a network.
Abstract:
Apparatuses, systems, and methods are disclosed for caching data. A method includes directly mapping a logical address of a backing store to a logical address of a non-volatile cache. A method includes mapping, in a logical-to-physical mapping structure, the logical address of the non-volatile cache to a physical location in the non-volatile cache. The physical location may store data associated with the logical address of the backing store. A method includes removing the mapping from the logical-to-physical mapping structure in response to evicting the data from the non-volatile cache so that membership in the logical-to-physical mapping structure denotes storage in the non-volatile cache.
Abstract:
Apparatuses, systems, methods, and computer program products are disclosed for providing access to auto-commit memory. An auto-commit memory module is configured to cause an auto-commit memory to commit stored data to a non-volatile memory medium in response to a failure condition. A mapping module is configured to determine whether to associate a range of data with the auto-commit memory. A bypass module is configured to service a request for the range of data directly from the auto-commit memory in response to the auto-commit mapping module determining to associate the range of data with the auto-commit memory.
Abstract:
Apparatuses, systems, methods, and computer program products are disclosed. A method includes receiving a request to copy data from a first location to a second location. The data may be associated with an identifier known to a client that initiated the request. One of the locations may include an auto-commit buffer of a non-volatile device. An auto-commit buffer may be configured to commit stored data from the auto-commit buffer to a non-volatile medium of a non-volatile device in response to a restart event. A method includes copying the data from the first location to the second location. A method includes preserving the identifier known to the client and an association between the identifier and a location of the data at the second location such that client can retrieve the data based on the identifier known to the client.
Abstract:
An apparatus, system, and method are disclosed for servicing storage requests for a non-volatile memory device. An interface module is configured to receive a storage request for a data set of a non-volatile memory device from a client. The data set is different from a block of the non-volatile memory device, and may have a length different from a block size of the non-volatile memory device. A block load module is configured to load data of at least the block size of the non-volatile memory device. A fulfillment module is configured to service the storage request using at least a portion of the loaded data.
Abstract:
Apparatuses, systems, methods, and computer program products are disclosed for a persistent data structure. A method includes associating a logical identifier with a data structure. A method includes writing data of a data structure to a first region of a volatile memory module. A volatile memory module may be configured to ensure that data is preserved in response to a trigger. A method includes copying data of a data structure from a volatile memory module to a non-volatile storage medium such that the data of the data structure remains associated with a logical identifier.
Abstract:
Apparatuses, systems, methods, and computer program products are disclosed for providing a memory device with volatile and non-volatile media. A volatile memory medium is on a circuit board configured to be installed on a memory bus of a processor. A non-volatile memory medium is on the same circuit board. A mapping module is configured to selectively store data in either the volatile memory medium or the non-volatile memory medium. The data is provided by way of one or more commands from the processor.