131 results about "Disk buffer" patented technology

High availability (HA) protection is provided for an executing virtual machine. A standby server provides a disk buffer that stores disk writes associated with a virtual machine executing on an active server. At a checkpoint in the HA process, the active server suspends the virtual machine; the standby server creates a checkpoint barrier at the last disk write received in the disk buffer; and the active server copies dirty memory pages to a buffer. After the completion of these steps, the active server resumes execution of the virtual machine; the buffered dirty memory pages are sent to and stored by the standby server. Then, the standby server flushes the disk writes up to the checkpoint barrier into disk storage and writes newly received disk writes into the disk buffer after the checkpoint barrier.

A solid hard disk controller belongs to the technical field of the hard disk storage. The hard disk controller comprises a command queue module and a flash memory parallel storage module. The command queue optimizing module acquires a command address queue and divides into a write address queue and a read address queue, extracts data from a hard disk buffer based on the address queue, and writes in the flash memory parallel storage module, reads data from the flash memory parallel storage module based on the read address queue and outputs to the hard disk buffer. The flash memory parallel storage module comprises more than one flash memory passages. A flash memory chip in the flash memory passage adopts the bite extending method. This invention separately processes the write operation and the read operation, and realizes the data parallel transmission via the flash memory parallel structure, thereby effectively improving the write/read efficiency of the solid hard disk.

In the invention, each node executes the following steps: 1) initializing the disc space; 2) formatting the disc space; 3) making check to decide if there is data to be buffered; 4) dividing the data to be buffered into normal data blocks; 5) selecting a proper sub-disc; 6) inserting the data to be buffered into the disc buffer queue; 7) deleting the buffer data already existing in the disc; 8) checking the buffer queue for writing into the disc to decide it is full; 11) deciding if the user quits the system.

The invention relates to the technical field of disk caching, in particularly to an object caching method based on a disk. The object caching method includes the steps that file storage space is divided to construct a file storage structure of secondary indexes, and the processes of adding objects to a disk cache and acquiring and deleting cached objects from the disk cache, a cache failure mechanism and the cache optimization arrangement process are achieved according to the file storage structure of the secondary indexes. Data of the objects are stored through chunks with the fixed sizes, the multiple small objects are merged and stored in one chunk, large objects are divided into a plurality of object blocks, the object blocks are stored in the multiple chunks respectively, the objects of any size and any type can be cached, and caching efficiency is higher.

The invention discloses a data storage method and device, terminal equipment and a storage medium. The method comprises the steps that according to detected to-be-stored data, writting the to-be-stored data into a data caching area in a memory; Synchronously writing the to-be-stored data as cache data into a disk cache file according to a memory mapping relation between the data cache area and thedisk cache file in the disk; And when it is determined that the data size of the disk cache file meets the capacity threshold condition, writing the cache data currently stored in the disk cache fileinto a disk storage file in a disk, and correspondingly deleting the cache data currently stored in the disk cache file. The embodiment of the invention can avoid the condition of data loss caused byusing a memory caching technology in the prior art, and can effectively reduce the frequency of input/output operation, reduce the system power consumption and improve the system performance while ensuring the integrity of the data.

The invention provides a method, a device, and a system for proceeding IO input and output operation on multiple cache devices. The method comprises the steps that a cache management module reads cache block information which comprises at least two addresses, wherein the at least two addresses point to least two different SSD cache devices; and the cache management module initiates data-reading operation on the at least two SSD cache devices according to the at least two addresses in the cache block information. The invention embodiments realize multiple-device parallel processing required by IO by configuring buffer block stripes in cache devices, and reading performance of cache blocks is improved; and data reliability is improved by adding mirror image copies to a dirty cache block.

The invention provides a disk cache method and device in parallel computer system. The method comprises pre-assigning the respective occupied rate of record data and information data in a data processing memory area; caching part of the record data in disk space with a Hash bucket as the unit when the capacity of the record data in the data processing memory area is about to exceed the pre-assigned rate during data loading; during calculating of task traversal access of the recorded data, caching the accessed Hash buckets in the data processing memory area in the disk space one by one till the released space can load the Hash buckets required to be accessed if the Hash buckets to be accessed is in the disk space and the surplus record data space in the data processing memory area is insufficient to load the Hash buckets to be accessed. By means of the method and the device, automatic caching of data to the disk can be achieved in a BSP model based parallel iterative computation system.

The present invention is aimed at providing a buffer method for video-on-demand program. The method is characterized in that the method comprises a step of obtaining the quantity of the demander demanding the program, wherein, the step is used for obtaining the quantity of the nodes on demand of the program on demand; a step of judging whether the program on demand is a hot program, wherein, the step is used for judging whether the program on demand is a hot program according to the quantity of the demanders demanding the program; a step of writing non hot programs into a hard disk, wherein, the step is used for writing data used least and buffered earliest into the hard disk. Because the present invention adopts the proposal of combining the internal memory and the hard disk buffer memory of non hot programs, the read write frequency of the hard disk can be greatly reduced, and better user satisfaction degree can be obtained; for hot programs, the present invention directly adopts the internal memory to buffer the rare resources in the network, therefore the buffer memory efficiency is enhanced on one hand, the hard disk buffer memory does not exist on the other hand, and thus the hard disk is not required to be read frequently.

Using high performance journal magnetic disk in small capacity as disk buffer raises disk synchronous writing operation in three-layered storage structure-memory, journal disk and data disk. When operating system executes synchronous writing operation, the method converts it to synchronous writing operation of journal disk and asynchronous writing operation of system buffer. Correspondingly, synchronous writing operation is raised. Features are: overhead of rotational delay is eliminated basically by predicting position of magnetic head so that command of writing operation is executed near place right ahead moving magnetic head. The method parks magnetic head at free magnetic track in advance; thus, in most cases, overhead of seeking track is also eliminated. Journal disk is through SCSI so as to improve performance of writing operation.

In accordance with one aspect of the invention, a method of receiving content over a content delivery system is provided. The method includes receiving a user request to initiate a rewind operation on content locally available in a live-off-disk (LOD) buffer. The content is associated with an event received over a content delivery system. If all of the event is not available in the LOD buffer, a message is communicated over the content delivery system to a headend requesting remaining content associated with an unreceived portion of the event. In response to the message, the remaining content is received from the headend over the content delivery system.

An I/O decoupling system comprising an I/O accelerator coupled between a host interface and a channel interface, wherein the I/O accelerator comprises a host manager, a buffer manager a function manager, and a disk buffer. The host manager is coupled to the host interface to receive a request from a connected host computer. The function manager in response to receiving the request allocates the disk buffer and determines a threshold offset for the buffer while coordinating the movement of data to the disk buffer through the channel interface coupled to the disk buffer.

The invention discloses an explosive type data caching and processing system for a SCADA system and a method of the explosive type data caching and processing system for the SCADA system. The system comprises a data receiving module, a file caching module, a data pre-reading module, an queue caching module, a data optimization module and a tread pool module, wherein the data receiving module receives a data storage request message sent by an application program and enables the data storage request message to be placed into a disk caching file or a caching queue of the file caching module according to a caching queue state, the data pre-reading module inserts a data storage request stored in the file caching module into the caching queue, the data optimization module reads the data storage request, optimizes the data storage request and then calls an idle thread in a thread pool to execute the data storage operation. The system and method can well solve the safety problem of data and the SCADA system when the massive data storage requests are submitted.

The invention discloses a data caching method and a date caching device. The method includes steps: ensuring data required disc caching; writing the data into disc according with pre-set writing rule; establishing index for data wrote into disc, and realizing data caching by using disc. Because disc has characteristics of large capacity, nonvolatility also likes, node in P2P on-demand system can provide more sharing resource, is not limited to media resource being on-demand, consequently, whole property of P2P on-demand system is increased.

A method (2) of controlling memory usage in a portable streaming device (100), a portable streaming device (100) and a computer readable medium (110). The portable streaming device (100) comprises at least one memory (102), at least one processing unit (101), and at least one storage device (103) being operatively connected with said memory (102) under control of said processing unit (101). The size of a disk scheduler buffer memory within said memory in said portable streaming device is adaptively maximised by said method (2) at all times. Free memory available within the portable streaming device is continuously allocated (50) and at least a portion of said allocated free memory is designated as disk scheduler buffer memory (60). Thus results improved solid state memory utilisation of the portable streaming device, and due to larger available disk buffer memory size, less start-stop-cycles of the storage device are initiated, which leads to a longer life-cycle of said portable streaming device.

The invention relates to a disk cache method of an embedded browser. The browser operates a first thread and a second thread, the first thread is used for initiating a network downloading request, and the second thread is used for storing and processing a disk cache. The method comprises the following steps of: operating the first thread, starting the second thread by the third thread, setting the second thread in a blockage state; obtaining network resource information by the first thread according to the network downloading request and then generating disk cache events and inserting into a disk cache event queue; and when the first thread is downloaded completely, setting the second thread in an operation state by the first thread, starting processing the disk cache events in the disk cache event queue by the second thread, and storing the network resource information to a disk. According to the invention, access speed of resources can be increased, user net play experiences are enhanced, and performance of the embedded browser is further improved.

The present invention provides a method of magnetic disc cache replacement in P2P video on demand system, includes following steps: 1) each client node sends the latest data cache information of the current node to neighbor nodes of the client node; 2) for each data block in magnetic disc cache of client nodes that needs replacing magnetic disc cache data, according to each neighbor node of the client node provided data cache information to obtain number of neighbor nodes needing the data block urgently and number of neighbor nodes needing the data block commonly; 3) according to number of neighbor nodes needing the data block urgently and number of neighbor nodes needing the data block commonly to obtain priority value of each the data block, further according to the priority value to obtain data blocks will be replaced; using data in the memory cache of the client nodes to cover the data blocks to be replaced. The invention can improve collaboration of nodes in system network and reduce pressure of media source server.

The invention provides a magnetic-optical-electric hybrid optical-disk library and a management method and a management system thereof. The optical-disk library includes an optical-disk library controller, a solid-state disk, a magnetic disk, multiple optical-disk drivers and multiple optical disks. The solid-state disk is used as a metadata area. The magnetic disk is used as a data cache area. The optical disks are used as a long-acting storage area. The optical-disk controller is connected with all the solid-state disk, the magnetic disk and the optical-disk drivers through high-speed data channels. The optical-disk library controller is used for virtualizing the whole optical-disk library into file volumes and controlling writing and reading of data, and is also used for providing external standard network storage interfaces. According to the optical-disk library, the characteristics of fast accessing speeds of the solid-state disk and the magnetic disk and long-acting data storageof the optical disks are combined to build a hierarchical storage system, a global file view and online data accessing of a user are provided, file data written by the user are stored in a magnetic-disk cache, metadata needing to be frequently read and written are stored in the metadata area formed by the solid-state disk, and an accessing speed of the data is increased.