A distributed processing method based on a consistency protocol is provided. The method includes: transmitting a decree prepare request including a first decree number, the decree prepare request requesting other nodes to promise to no longer accept a fast write operation initiated by a leader node whose leader number is less than the first decree number, the first decree number representing a leader number of a current node, and the leader number representing a number of a decree at which the current node that becomes a leader node is located; and in response to receiving decree promises from at least a preset quantity of nodes among the other nodes, enabling the fast write operation from a subsequent decree number of a second decree number determined based on the decree promises, each of the decree promises including the first decree number.

During operation, a key-value storage system can receive a request to write data to a data region in a first non-volatile memory. The system can determine a key associated with the data and the key can correspond to an entry in a data structure maintained by a volatile memory the storage system. In response to determining the key, the system can write the data to the data region in the first non-volatile memory. The system can update in the volatile memory the data structure entry corresponding to the key with a physical location in the data region of the first non-volatile memory to which the data is written. The system can write the data structure update to a second non-volatile memory. The system can then store a snapshot of the data structure in a metadata region associated with the first non-volatile memory, thereby allowing persistent storage of the data structure.

A method includes performing a copyback operation comprising transferring, using an internal processing device, user data and header data corresponding to the user data from a first block of memory in a memory device to a register in the memory device, decoupling the user data from the header data, performing an error correction code (ECC) operation on updated header data using an external processing device, transferring, via the external processing device, the updated header data to the register, and transferring the user data and the updated header data from the register to a second block of memory in the memory device.

Techniques for using erasure coding in a single region to reduce the likelihood of losing objects in a cloud object storage platform are provided. In one set of embodiments, a computer system can upload a plurality of data objects to a region of a cloud object storage platform, where the plurality of data objects including modifications to a data set. The computer system can further compute a parity object based on the plurality of data objects, where the parity object encodes parity information for the plurality of data objects. The computer system can then upload the parity object to the same region where the plurality of data objects was uploaded.

The present disclosure provides methods, systems, and non-transitory computer readable media for performing data transfers with improved error encoding. The methods include receiving a request for data transfer from a source medium in the data storage system to a destination medium in the data storage system, wherein the data storage system comprises a computer cluster and a storage cluster; determining whether the source medium and the destination medium are within the storage cluster; based on the determination of whether the source medium and the destination medium are within the storage cluster, transferring the data from the source medium to the destination medium, wherein: the data is transferred without performing error correcting code check when the data is transferred within the storage cluster, and the data is transferred with an error correcting code check when the data is transferred between the computer cluster and the storage cluster.

In one embodiment, a system for managing communication connections in a virtualization environment includes a plurality of host machines implementing a virtualization environment, wherein each of the host machines includes a hypervisor, at least one user virtual machine (user VM), and a distributed file server that includes file server virtual machines (FSVMs) and associated local storage devices. Each FSVM and associated local storage device are local to a corresponding one of the host machines, and the FSVMs conduct I/O transactions with their associated local storage devices based on I/O requests received from the user VMs. Each of the user VMs on each host machine sends each of its respective I/O requests to an FSVM that is selected by one or more of the FSVMs for each I/O request based on a lookup table that maps a storage item referenced by the I/O request to the selected one of the FSVMs.

Provided are a computer program product for managing tracks in a storage in a cache. An active track data structure indicates tracks in the cache that have an active status. An active bit in a cache control block for a track is set to indicate active for the track indicated as active in the active track data structure. In response to processing the cache control block, a determination is made, from the cache control block for the track, whether the track is active or inactive to determine processing for the cache control block.

Responsive to a power-on of a memory device, an elapsed power-off time is identified based on a difference between a time at which the power-on occurred and a time at which a previous power-off of the memory device occurred. Responsive to a determination that the elapsed power-off time satisfies the elapsed time threshold criterion, a request to perform a first write operation on a memory unit of the memory device since power on is received, a performance parameter associated with the memory unit of the memory device is changed to a first parameter value that corresponds to a reduced performance level, and the write operation is performed on the memory unit of the memory device in accordance with the first parameter value that corresponds to the reduced performance level. Responsive to completion of the write operation, the performance parameter is changed to a value that corresponds to a normal performance level.

Systems, apparatuses and methods may provide for technology that detects a request to program a NAND memory containing a plurality of dies and programs the NAND memory on a stripe-by-stripe basis, wherein each stripe spans the plurality of dies and includes multiple types of pages. The multiple types of pages may reduce program time variability across the stripes and reduce the error susceptibility of the NAND memory.

Various implementations described herein relate to systems and methods for managing metadata using an in-memory journal, including determining metadata for data, storing the metadata in an in-memory journal, detecting an imminent interruption to operations of the storage device, in response to detecting the imminent interruption, program the in-memory journal to a non-volatile memory device of the storage device, detect that the operations of the storage device are being restored, and in response to detecting that the operations of the storage device are being restored, performing metadata update. The first data is read from first original areas of a non-volatile memory. The first metadata includes a first physical address for each of first new areas of the non-volatile memory. The metadata is programmed in a metadata area of the non-volatile memory device.