Abstract: An apparatus includes an interface, a capacity engine, a monitoring engine, and a purging engine. The interface receives a request to repair a cache. The capacity engine monitors a cache to determine a first amount of data the cache receives in a first predetermined amount of time. The capacity engine determines a second amount of data indicating an estimated amount of data the cache will receive in a second predetermined amount of time. The capacity engine determines a size of the cache and a maximum size threshold using the second amount of data. The monitoring engine determines an available capacity of the cache and that the available capacity is less than or equal to the maximum size threshold. The purging engine purges data from the cache.

Abstract: A technique is directed to managing a pool of slices provided by data storage equipment. The technique involves monitoring usage of the pool of slices provided by the data storage equipment, and generating an estimate based on the monitored usage of the pool of slices. The estimate identifies when a slice usage level of the pool of slices will reach a predefined usage level (e.g., the number of days remaining before the pool will become completely full, 90% full, 80% full, etc.). The technique further involves, in response to the estimate reaching a predefined threshold (e.g., when the number of days remaining is 5 days, 4 days, 3 days, etc.), performing a remedial activity to prevent full consumption of the pool of slices.

Abstract: The present disclosure includes a non-volatile memory having a boot region, a file allocation table region and a data region; a memory configured to store a program for managing a file recording; and a processor configured to execute the program. Wherein the processor allocates metadata corresponding to a file to be stored in the non-volatile memory to the FAT region as the program is executed, the processor allocates a plurality of clusters to the data region based on information upon a size of the file included in the metadata, the processor writes the file in the plurality of clusters allocated to the data region, if a size of the written file is different from a size of the plurality of allocated clusters, the processor updates the metadata based on the size of the file.

Abstract: A system, method, and program product are disclosed for asynchronous remote copy. One method includes transmitting a write request to a remote primary storage cluster for an asynchronous remote copy operation. The method also includes creating an entry in a write record stored in the local memory, the entry comprising a data consistency value, and removing the entry from the write record in response to receiving an acknowledgement from a remote secondary storage cluster that the asynchronous remote copy operation is completed.

Abstract: A first write data and a second write data destined for a first solid state storage channel and a second solid state storage channel, respectively, is received. The first write data is chopped using a chopping factor in order to obtain (1) a first piece of chopped write data destined for the first solid state storage channel and (2) a second piece of chopped write data destined for the first solid state storage channel. The second write data is chopped using the chopping factor in order to obtain (1) a third piece of chopped write data destined for the second solid state storage channel and (2) a fourth piece of chopped write data destined for the second solid state storage channel.

Abstract: In one aspect, a method includes generating a protection file system in a deduplication storage array, generating a snapshot of a production volume in the deduplication storage array including hashes of data in the snapshot, generating a first file hierarchy for the hashes of the data in the snapshot in the protection file system and adding a retention indicator to each hash in the first file hierarchy.

Abstract: Systems and methods for controlling access to a memory are provided. The system may include a buffer to store output data generated by a processing module, and provide the output data to a real-time module, and a buffer monitoring circuit to output an underflow approaching state indication in response to an amount of available data in the buffer being less than or equal to a threshold. The system may include a memory access module arranged to receive memory requests issued by the processing module, and configured to, while operating in a first mode, respond to memory requests with corresponding data retrieved from the memory, switch to operating in a second mode in response to receiving the underflow approaching state indication, and in response to operating in the second mode, respond to memory requests indicating the memory access module did not attempt to retrieve corresponding data from the memory.

Abstract: In one embodiment a plurality of open channel solid state drives (SSDs) are implemented over a network comprised of a network switch having a plurality of nodes, a remote host connected to a first node of the network switch, a metadata server connected to a second node of the network switch, and an abstracted memory structure comprised of at least part of one of the plurality of open channel SSDs. In one embodiment, the remote host is configured to communicate with the metadata server by issuing a command identifying data related to the abstracted memory structure. In another embodiment, the metadata server is configured to communicate with the remote host by responding to the command and identifying a physical address corresponding to the identified data.

Abstract: A solid state drive (SSD) with pseudo-single-level cell (pSLC) caching and a method of caching data in an SSD is disclosed. In one embodiment, the SSD includes a plurality of multibit NAND media devices arranged in one or more channels communicatively coupled to a memory controller. The SSD further includes one or more volatile memory devices communicatively coupled to the memory controller, where at least one of the one or more volatile memory devices has a read cache area. A first portion of the plurality of multibit NAND media devices is configured to operate as a pSLC write cache and a second portion of the plurality of multibit NAND media devices is configured to operate as a multibit NAND media storage area.

Abstract: Performing data processing for data sets stored in each of a plurality of storage devices includes collecting access data indicating details of accesses to each of the plurality of storage devices and computing predicted changes in access frequency for each of the storage devices on the basis of the access data for each of the plurality of storage devices in response to a request to reserve a storage area for storing a new data set. A storage device in which the storage area for storing the new data set is to be reserved is selected from among the plurality of storage devices on the basis of the predicted changes for each storage device.

Abstract: Methods and apparatus for reliable distributed messaging are described. A computer system includes a system memory coupled to one or more processors. The system memory comprises at least a non-volatile portion. A particular location within the non-volatile portion is designated as a target location to which a sender module participating in a communication protocol is granted write permission. A receiver module participating in the communication protocol, subsequent to a failure event that results in a loss of data stored in a volatile portion of the system memory, reads a data item written by the sender program at the target location prior to the failure event. The receiver module performs an operation based on contents of the data item.

Abstract: Local checkpointing using a multi-level call is described herein. An example method includes storing a first datum in a first level of a multi-level cell. A second datum is stored in a second level of the multi-level cell, the second datum representing a checkpoint of the first datum. The first datum is copied from the first level to the second level of the multi-level cell to create the checkpoint.

Abstract: Masking information may be automatically determined for a host after zoning between the host and data storage system is complete. Processing may include the host sending host registration commands from host initiators. From registration information provided with the host registration commands, an initiator group may be determined for the masking view as including the initiators identified as belonging to the host. A port group may be determined as those target ports at which the host registration commands are received. A default storage group with a default device may be created. A masking view for the host may be created that includes the initiator group, the target port group and the default storage group whereby the masking view indicates that the first device is accessible or exposed, through each target port of the target port group, to each initiator of the initiator group.

Abstract: A method for storing data on a storage device includes receiving data to be stored and a logical address for storing the data. A physical address is determined and the data to be stored is stored at the determined physical address. A table that associates logical addresses with physical addresses is examined to determine a difference relationship between the determined physical address and a corresponding physical address for one of other logical addresses. Information representing the determined physical address is stored in the table, in association with the received logical address, as a function of the determined difference relationship. A data storage device includes controller circuitry and memory for storing a lookup table that associates logical addresses with physical addresses. The controller circuitry operates in accordance with the method.

Abstract: According to one aspect of the present disclosure, a system and technique for capacity forecasting is disclosed. The system includes a host having a processor unit and a memory. Resource data stored associated with an environment is stored in the memory, the resource data comprising inventory information of applications, processing resources and storage resources of the environment. A ledger module is executable by a processor unit to: create a capacity-associated transaction; identify and link at least one of an application, processing resource and storage resource to the transaction from the resource data; determine an initiation time and duration associated with the transaction; and forecast a change in capacity of at least one linked storage resource for the transaction and a time of the change in capacity.

Abstract: Providing snapshots for a logical device includes maintaining a global sequence number for the logical device, providing a snapshot table having a plurality of entries, where each of the entries corresponds to a targetless snapshot and includes a sequence number associated with a particular one of the targetless snapshots, the sequence number corresponding to the global sequence number at a time each of the snapshots is created, and, if a sequence number associated with a specific portion of the logical device is less than the global sequence number, then prior to moving new data to a specific portion of the logical device, copying old data from the specific portion to a location in a pool device, setting a pointer in a replication data pointer table to point to the location in the pool device and setting the sequence number associated with the specific portion to equal the global sequence number.

Abstract: According to one aspect of the present disclosure, a method and technique for capacity forecasting is disclosed. The method includes: storing, in a memory, resource data associated with an environment, the resource data comprising inventory information of applications, processing resources and storage resources of the environment; and providing a ledger module executable by a processor unit to: create a capacity-associated transaction; identify and link at least one of an application, processing resource and storage resource to the transaction from the resource data; determine an initiation time and duration associated with the transaction; and forecast a change in capacity of at least one linked storage resource for the transaction and a time of the change in capacity.

Abstract: The present invention provides a method for constructing an NVRAM-based efficient file system, including the following steps: S1. determining a file operation type of the file system, where the file operation type includes a file read operation, a non-persistent file write operation, and a persistent file write operation; and S2. if the file operation type is a non-persistent file write operation, writing, by the file system, content of the non-persistent file write operation to a dynamic random access memory DRAM, updating a corresponding DRAM cache block index, and flushing, at a preset time point, the content of the non-persistent file write operation back to a non-volatile random access memory NVRAM asynchronously, or otherwise, copying, by the file system, related data directly between the NVRAM/DRAM and the user buffer.

Abstract: A data handling system having a physical storage device and a storage controller responsible for provisioning, managing, and servicing logical unit numbers (LUNs) with self-destruction properties on the physical storage device is disclosed. For a given LUN, the storage controller creates a profile including self-destruction properties, such as a LUN destruction date, and associates the profile with the LUN. The profiles may be independent of file format and content of any associated data and the LUN destruction date may be a function of the last access date of the associated data. The storage controller monitors the LUN destruction date associated with each LUN and determines the last access date of any associated data. The storage controller marks a LUN having a past-due LUN destruction date, notifies a user of an approaching LUN destruction date, and destroys any past-due LUNs.

Abstract: Performing data processing for data sets stored in each of a plurality of storage devices includes collecting access data indicating details of accesses to each of the plurality of storage devices and computing predicted changes in access frequency for each of the storage devices on the basis of the access data for each of the plurality of storage devices in response to a request to reserve a storage area for storing a new data set. A storage device in which the storage area for storing the new data set is to be reserved is selected from among the plurality of storage devices on the basis of the predicted changes for each storage device.