1246 results about "Disk storage" patented technology

A write interface in a file server provides permission management for concurrent access to data blocks of a file, ensures correct use and update of indirect blocks in a tree of the file, preallocates file blocks when the file is extended, solves access conflicts for concurrent reads and writes to the same block, and permits the use of pipelined processors. For example, a write operation includes obtaining a per file allocation mutex (mutually exclusive lock), preallocating a metadata block, releasing the allocation mutex, issuing an asynchronous write request for writing to the file, waiting for the asynchronous write request to complete, obtaining the allocation mutex, committing the preallocated metadata block, and releasing the allocation mutex. Since no locks are held during the writing of data to the on-disk storage and this data write takes the majority of the time, the method enhances concurrency while maintaining data integrity.

A media player and a method for operating a media player are disclosed. A media program is able to substantially immediately begin playing after a media play selection has been made. Through intelligent operation, the media program is able to start playing even before the media program has been substantially or completely loaded from disk storage into semiconductor memory (i.e., cache memory). Additionally, the media program can be loaded into semiconductor memory through use of a background process without disturbing the playing of the media program. Further, if desired, the disk storage is able to be aggressively “powered off” when not being accessed, thereby enhancing battery life when being battery-powered.

A disk drive system and method capable of dynamically allocating data is provided. The disk drive system may include a RAID subsystem having a pool of storage, for example a page pool of storage that maintains a free list of RAIDs, or a matrix of disk storage blocks that maintain a null list of RAIDs, and a disk manager having at least one disk storage system controller. The RAID subsystem and disk manager dynamically allocate data across the pool of storage and a plurality of disk drives based on RAID-to-disk mapping. The RAID subsystem and disk manager determine whether additional disk drives are required, and a notification is sent if the additional disk drives are required. Dynamic data allocation and data progression allow a user to acquire a disk drive later in time when it is needed. Dynamic data allocation also allows efficient data storage of snapshots/point-in-time copies of virtual volume pool of storage, instant data replay and data instant fusion for data backup, recovery etc., remote data storage, and data progression, etc.

A portion of a storage controller's cache memory is used as a virtual solid state disk storage device to improve overall storage subsystem performance. In a first embodiment, the virtual solid state disk storage device is a single virtual disk drive for storing controller based information. In the first embodiment, the virtual solid state disk is reserved for use by the controller. In a second embodiment, a hybrid virtual LUN is configured as one or more virtual solid state disks in conjunction with one or more physical disks and managed using RAID levels 1-6. Since the hybrid virtual LUN is in the cache memory of the controller, data access times are reduced and throughput is increased by reduction of the RAID write penalty. The hybrid virtual LUN provides write performance that is typical of RAID 0. In a third embodiment, a high-speed virtual LUN is configured as a plurality of virtual solid state disks and managed as an entire virtual RAID LUN. Standard battery backup and redundant controller features of RAID controller technology ensure virtual solid state disk storage device non-volatility and redundancy in the event of controller failures.

A cached disk array includes a disk storage array, a global cache memory, disk directors coupling the cache memory to the disk storage array, and front-end directors for linking host computers to the cache memory. The front-end directors service storage access requests from the host computers, and the disk directors stage requested data from the disk storage array to the cache memory and write new data to the disk storage. At least one of the front-end directors or disk directors is programmed for block resolution of virtual logical units of the disk storage, and for obtaining, from a storage allocation server, space allocation and mapping information for pre-allocated blocks of the disk storage, and for returning to the storage allocation server requests to commit the pre-allocated blocks of storage once data is first written to the pre-allocated blocks of storage.

Access to movies ranging from very popular movies to unpopular movies is managed by configuring sets of data movers for associated movie rankings, reserving data mover local cache resources for the most popular movies, reserving a certain number of streams for popular movies, negotiating with a client for selection of available movie titles during peak demand when resources are not available to start any freely-selected movie in disk storage, and managing disk bandwidth and primary and local cache memory and bandwidth resources for popular and unpopular movies. The assignment of resources to movie rankings may remain the same while the rankings of the movies are adjusted, for example, during off-peak hours. A movie locked in primary cache and providing a source for servicing a number of video streams may be demoted from primary cache to disk in favor of servicing one or more streams of a higher-ranking movie.

Allocation process that allows erasure coded data to be stored on any of a plurality of disk drives, in a pool of drives, so that the allocation is not tied to a fixed group of drives. Still further, the encoded data can be generated by any of multiple different erasure coding algorithms, where again storage of the encoded data is not restricted to a single group of drives based on the erasure algorithm being utilized to encode the data. In another embodiment, the encoded data can be “stacked” (aligned) on select drives to reduce the number of head seeks required to access the data. As a result of these improvements, the system can dynamically determine which one of multiple erasure coding algorithms to utilize for a given incoming data block, without being tied to one particular algorithm and one particular group of storage devices as in the prior art.

A network switch is disclosed for resolving requests from a plurality of host initiators by scheduling access to a plurality of disk storage devices. The network switch comprises a switched fabric comprising a plurality of switching elements. Each switching element comprises a plurality of bi-directional switched fabric ports, and a control input connected to receive switch control data for selectively configuring the switching element in order to interconnect the bi-directional switched fabric ports. The network switch further comprises a memory for storing a routing and scheduling program, and a microprocessor, responsive to the requests, for executing the steps of the routing and scheduling program to generate the switch control data to transmit scheduled requests through the bi-directional switched fabric ports. At least one of the plurality of switching elements comprises a disk storage interface for connecting to a selected one of the disk storage devices. The microprocessor schedules access to the plurality of disk storage devices through the disk storage interface. The disk storage interface receives scheduling data from the selected one of the storage devices, and the memory stores the scheduling data received via the bi-directional switched fabric ports of a selected number of the switching elements. The scheduling data is processed according to a priority such that the selected switching elements transfer the scheduling data through the bi-directional switched fabric ports before transferring data associated with the scheduled requests.

A system and method for efficiently and quickly handling content and transaction requests from various users at respective end terminals. According to embodiments of the invention, plural servers are provided at the web site to randomly receive requests from users over a communications network, such as the Internet. Each server contains a memory, such as a cache or disk storage process, that contains a copy of all data contained on every other server. When a request comes in to one of the servers, in addition to processing the request, that server broadcasts data corresponding to the request to the other servers, which are programmed to store the same request data in their respective local memories. Such broadcasts may be preferably carried out over a back-end, private network.

A system and method for recovering from a computer system crashing as a result of the storage disk suffering physical damage and/or the corruption of an application, operating system, and/or data. The computer system may be standalone or a part of a communication network. The computer includes a hard disk storage divided into a primary partition containing a unique operating system for executing application programs and a recovery partition containing a unique operating system for executing application programs and for backup data storage. A boot track storing a boot manager, a backup status information file for establishing communication between the operating systems of the primary and recovery partitions, and a status validation file verifying the integrity of the backup status information file.

A disk drive box 10 accommodates a plurality of disk drives 20 within a case 11. A side face of each of the drives 20 is provided with a heat-absorbing part 40 including a heat pipe, corresponding to heat producing area HP. The heat taken away by the heat-absorbing part 40 is transmitted to a heat sink 50 of the rear of a backboard 30 via a heat connector 60. The heat sink 50 is cooled by cooling air flowing through an air duct 7. By cooling the drive 20 with the heat pipe, clearances between the drives 20 can be substantially eliminated, and it is made unnecessary to form an opening for air cooling in the backboard 30. Thus, size reduction is possible, and it is possible to increase the degree of freedom for a wiring pattern formed on the backboard 30.

A disk drive is disclosed that is configured to be accessible in fail-over via buses associated with plural host interfaces. In accordance with exemplary embodiments of the present invention, the disk drive comprises a disk storage medium, a first bus connection, and a second bus connection. The disk drive comprises a switch for selectively connecting the disk storage medium to at least one of the first and second bus connections. The disk drive also comprises an interface controller for detecting whether at least one of the first and second bus connections is active and for controlling the switch in response.

A first virtual machine executing in a first computer server is replicated to a second virtual machine executing in a second computer server, where the first computer server and the second computer server are connected over a network and are each connected to one or more disk storage units capable of storing files in a file system. Virtual disks of the first virtual machine on the first server are transmitted to the second server, where each transmitted virtual disk is stored as a file in a storage unit connected to the second server and corresponds to one of a plurality of virtual disks of the second virtual machine running in the second server, and where the virtual disks of the first virtual machine have a first format and the virtual disks of the second virtual machine have a second format that is different from the first format. A plurality of updates to the virtual disks of the first virtual machine is captured, and contiguous data blocks from the virtual disks of the first virtual machine that are subject to the captured updates are identified. The identified contiguous data blocks are then transmitted to the second server for storage in the virtual disks of the second virtual machine.

An epileptiform activity patient-specific template creation system permits a user to efficiently develop an optimized set of patient-specific parameters for epileptiform activity detection algorithms. The epileptiform activity patient template creation system is primarily directed for use with an implantable neurostimulator system having EEG storage capability, in conjunction with a computer software program operating within a computer workstation having a processor, disk storage and input/output facilities for storing, processing and displaying patient EEG signals. The implantable neurostimulator is operative to store records of EEG data when neurological events are detected, when it receives external commands to record, or at preset or random times. The computer workstation operates on stored and uploaded records of EEG data to derive the patient-specific templates.

Apparatus and systems, as well as methods and articles, may operate to receive an indication that a housing having an integrated auxiliary display and a memory forming a portion of a redundant array disk storage has been inserted into a recessed housing compartment of a portable computer having an integrated primary display, and to execute a storage operation using the redundant array disk storage.

A method for data deduplication includes the following steps. First, segmenting an original data set into a plurality of data segments. Next, transforming the data in each data segment into a transformed data representation that has a band-type structure for each data segment. The band-type structure includes a plurality of bands. Next, selecting a first set of bands, grouping them together and storing them with the original data set. The first set of bands includes non-identical transformed data for each data segment. Next, selecting a second set of bands and grouping them together. The second set of bands includes identical transformed data for each data segment. Next, applying a hash function onto the transformed data of the second set of bands and thereby generating transformed data segments indexed by hash function indices. Finally, storing the hash function indices and the transformed data representation of one representative data segment in a deduplication database.

A method and mechanism is disclosed for implementing storage and retrieval of data in a computing system. Data compression is performed on stored data by reducing or eliminating duplicate values in a database block. Duplicated values are eliminated within the set of data that is to be stored within a particular data storage unit. Rather than writing the duplicated data values to the data storage unit, the on-disk data is configured to reference a symbol table a single copy of each duplicated data value. Column reordering may be performed in an embodiment to further improve compression efficiency. The column reordering may be performed to allow efficient removal of trailing NULL values from on-disk storage.

A system and method for enabling parallel replay of a backup memory log of client transaction request entries to a network storage appliance file system is provided. The backup memory is typically implemented as a non-volatile random access memory (NVRAM). An initiator establishes a swarm of messages with a plurality of transaction blocks pointing to logged request entries and related states associated therewith. The states represent the various phases of file system recovery and disk storage including a retrieval of disk information (data and meta-data), typically in the form of a LOAD, and a subsequent modify phase. The swarm is transferred to the file system for parallel disk information-retrieval in an interleaved process. Any transactions that cannot be performed due to a required prerequisite action (e.g. a prior file-create) are returned to the initiator for reloading once the prerequisite action has occurred.

A method is disclosed for installing a mailbox file associated with a disk storage medium of a disk drive. In accordance with exemplary embodiments of the present invention, a computer system includes a host computer, a disk drive host interface and a disk drive having a disk storage medium with a first range of disk drive host interface addressable locations. A disk drive access key is obtained from an access key server, the access key being generated by the access key server as a function of an identifying characteristic of the disk drive. A mailbox file is created in the first range of addressable locations using the access key obtained from the access key server. The disk drive is notified of a location of the mailbox file in the first range of addressable locations such that the disk drive can perform a function characterized by contents of the mailbox file.

A tape storage emulator provides response data corresponding to a tape storage device and receives a non-media command from a server. The response data is sent to the server in response to the non-media command. A media command is received from the server. The media command is applied to a virtual tape volume configured on a disk storage device.

An arrangement sanitizes a digital data storage unit, such as a disk data storage unit, by encrypting the information that is stored thereon. When the previously-stored information is retrieved from the digital data storage system storage unit, the information is decrypted prior to being provided to the device that requested retrieval of the data. If the digital data storage unit is to be sanitized, the key or keys that used to at least decrypt the data stored on the digital data storage unit are discarded or made unavailable for use in decrypting the encrypted digital data, thereby making the unencrypted data unavailable. Any of a number of types of encryption/decryption methodologies can be used, including a symmetric key methodology, an asymmetric key methodology such as a public key/private key methodology, or any of a number of other encryption/decryption methodologies.

Methods, apparatus, and systems for sharing resources across a plurality of computing platforms. Firmware provided on each platform is loaded for operating system runtime availability. Shared resources are presented to operating systems running on the platforms as local resources, while in reality they are generally hosted by other platforms. An operating system resource access request is received by a requesting platform and rerouted to another platform that actually hosts a target resource used to service the resource access request. Global resource maps are employed to determine the appropriate host platforms. Communications between the platforms is enabled via an out-of-band (OOB) communication channel or network. A hidden execution mode is implemented to effectuate data rerouting via the OOB channel such that the method is performed in a manner that is transparent to operating systems running on the platforms. The shared resources include storage, input, and video devices. The method can be used to support shared KVM resources, and shared disk storage.