Table data is stored by parsing the table data into columns of values, formatting each column into a data stream, and transferring each data stream to a storage device for storage as a continuous strip of data The strip of data is stored as a file that is not structured as a series of pages The formatting of the data stream may include compressing the column values to minimize the length of the data strip A particular compression procedure may be used that derives a code for each value in the column from a number of occurrences of the value in the column and replaces the value in the data stream with the corresponding code

Storage of row-column data

High endurance non-volatile memory devices (NVMD) are described. A high endurance NVMD includes an I/O interface, a NVM controller, a CPU along with a volatile memory subsystem and at least one non-volatile memory (NVM) module. The volatile memory cache subsystem is configured as a data cache subsystem. The at least one NVM module is configured as a data storage when the NVMD is adapted to a host computer system. The I/O interface is configured to receive incoming data from the host to the data cache subsystem and to send request data from the data cache subsystem to the host. The at least one NVM module may comprise at least first and second types of NVM. The first type comprises SLC flash memory while the second type MLC flash. The first type of NVM is configured as a buffer between the data cache subsystem and the second type of NVM.

High Endurance Non-Volatile Memory Devices

This invention relates to architecture and synchronization of multi-processor computing hardware. It establishes a new method of programming, process synchronization, and of computer construction, named stress-flow by the inventor, allowing benefits of both opposing legacy concepts of programming (namely of both data-flow and control flow) within one cohesive, powerful, object-oriented scheme. This invention also relates to construction of object-oriented, parallel computer languages, script and visual, together with compiler construction and method to write programs to be executed in fully parallel (or multi-processor) architectures, virtually parallel, and single-processor multitasking computer systems.

Object-oriented, parallel language, method of programming and multi-processor computer

A system and method for performing real-time replication of data across a network is provided. A mirroring engine receives a write request from a host application operating on a source computer. The mirroring engine compares data in the write request with corresponding data stored in memory. If data in the write request differs from stored data, the mirroring engine processes the write request. Processing involves computing a data signature across data in the write request and associating the signature with a transaction number and a status byte. The transaction number is used to uniquely identify the data signature and can be used to ensure that the signature is properly handled if it is received, for example, out of order. The status byte contains information used for handling the data signature and transaction number as well as information identifying how the data signature was computed. In an embodiment, the status byte may contain a bit for identifying if the data signature was computed across an entire block of data or if the signature was computed over only a portion of a data block, such as for example, only data bytes that have changed as compared with those in the stored data. Processing may further include compressing and encrypting the data signature, transaction number and status byte prior to transmission over a network. Embodiments may further employ a meta-file for storing data signatures, transaction numbers, status bytes, and other information useful for performing real-time data replication over a network.

System and method for replicating files in a computer network

A method and system for recovering a corrupt virtual disk is discussed A request to recover the disk may be received A recovery snapshot for the last point-in-time the system was stable may be synthesized A difference may be identified between that recovery snapshot and the corrupt disk A virtual machine may communicate with both the difference and the corrupt disk, and the difference may be merged with the corrupt disk

Recovering corrupt virtual machine disks

When a computer system is upgraded, such as by adding a more advanced processor chip and/or a new operating system, a different page size may be employed. The page size is altered for data previously stored in a storage medium such as a hard disk in the computer system, without removing all of the data from the medium and rewriting it. Data is stored in the medium in blocks or sectors which have headers defining the block. Also, tables define memory objects and segments, and locate virtual memory addresses in physical memory. The headers and/or tables can be changed without rewriting all of the data in the sectors or pages in physical memory, so the page size is changed to accommodate the new system components, without excessive burden on system hardware or undue expenditure of time. In an example, in changing from a CISC processor with a 512-byte page size to a RISC system with a 4K-byte page size, the segments are changed to always be of a size of an integral multiple of 4K, and "extents" or subdivisions within a segment are changed to be multiples of 4K. Any excess space generated by these changes is zeroed. After alteration, the media (such as disks) can be accessed by either the CISC system or the new upgraded RISC system.

Changing page size in storage media of computer system

An apparatus and method provides the capability of mirroring storage from a primary system to a mirrored system in a way that uses parallelism in the mirrored system to maximize the efficiency of writing data to the mirrored storage for operations that do not conflict while serializing operations that do conflict. The mirroring of the present invention is “logical mirroring”, which does not require identical disk drives, and which supports mirroring between geographically remote locations to protect against catastrophic site failure. Parallelism is achieved in the mirrored system by dividing the virtual address space into multiple ranges, and by assigning a group of tasks to each range. When an operation is received on the mirrored system, the virtual address range that the operation affects is determined, and the operation is then delegated to the task group that corresponds to the affected virtual address range. By dividing the virtual address space into ranges, tasks in different ranges (i.e., in different task groups) may execute in parallel without any threat of conflict, and even tasks within the same range may execute in parallel if they operate in different portions of the range.

Apparatus and method for writing data to mirrored storage using multiple tasks working in parallel

An apparatus and method provides the capability of mirroring storage between geographically remote locations in an asynchronous manner that does not require all writes on primary storage to be performed in the same order on the mirrored storage. The mirroring of the present invention is “logical mirroring”, which does not require identical disk drives, and which supports mirroring between geographically remote locations to protect against catastrophic site failure. A sequence number is assigned to data written to primary storage before the data is transferred to the mirrored storage. The mirrored storage can write data asynchronously, which may result in some data being written before previous data on the mirrored storage. When a system failure occurs that requires use of the mirrored storage, the mirrored storage is first quiesced to allow all pending writes to occur. If the mirrored storage has no missing data corresponding to a sequence number that is lower than the highest sequence number of data written to the mirrored storage, the mirrored storage may be used. If, however, the mirrored storage has missing data corresponding to a sequence number that is lower than the highest sequence number of data written to the mirrored storage, the mirrored storage cannot be used.

Apparatus and method for asynchronous logical mirroring

An apparatus, program product and method backs up computer data by organizing update requests into groups. All update requests in one group complete concurrently before requests of a subsequent group complete.

Asynchronous hybrid mirroring system

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Changing page size in storage media of computer system

Apparatus and method for writing data to mirrored storage using multiple tasks working in parallel

Apparatus and method for asynchronous logical mirroring

Asynchronous hybrid mirroring system