Matches 1 - 33 out of 33
Match Document Document Title
7434079 Microcomputer, method of controlling cache memory, and method of controlling clock  
A microcomputer that can increase the usage efficiency of a cache memory and increase the process speed is provided. In this microcomputer, a group of registers hold cache usage information that...
7073090 Remote data mirroring system having a remote link adapter  
A primary data storage system is linked to a geographically remote secondary data storage system for automatically maintaining a remote copy of the data in the primary storage. The primary data...
7055059 Remote data mirroring  
Two data storage systems are interconnected by a data link for remote mirroring of data. Each volume of data is configured as local, primary in a remotely mirrored volume pair, or secondary in a...
6792484 Method and apparatus for storing data using a plurality of queues  
An apparatus for storing data of transactions includes a memory having a plurality of queues having locations where the data is stored, and shared memory. Each queue of the plurality of queues has...
6748486 Method, system, and data structures for superimposing data records in a first data format to memory in a second data format  
Provided is a method, system, and program for superimposing a data record in a first data format onto a storage space in a second data format. A plurality of control blocks are built in memory...
6704837 Method and apparatus for increasing RAID write performance by maintaining a full track write counter  
A method and apparatus for improving write performance in a disk array, wherein unnecessary track grouping is avoided during writes, by using a full track write counter. When a write request is...
6647474 Remote data mirroring system using local and remote write pending indicators  
A primary data storage system is linked to a geographically remote secondary data storage system for automatically maintaining a remote copy of the data in the primary storage. The primary data...
6625705 Remote data mirroring system having a service processor  
A primary data storage system is linked to a geographically remote secondary data storage system for automatically maintaining a remote copy of the data in the primary storage. Each of the data...
6502205 Asynchronous remote data mirroring system  
Two data storage systems are interconnected by a data link for remote mirroring of data. Each volume of data is configured as local, primary in a remotely mirrored volume pair, or secondary in a...
6173377 Remote data mirroring  
Two data storage systems are interconnected by a data link for remote mirroring of data. Each volume of data is configured as local, primary in a remotely mirrored volume pair, or secondary in a...
6052797 Remotely mirrored data storage system with a count indicative of data consistency  
Two data storage systems are interconnected by a data link for remote mirroring of data. Each volume of data is configured as local, primary in a remotely mirrored volume pair, or secondary in a...
6044444 Remote data mirroring having preselection of automatic recovery or intervention required when a disruption is detected  
Two data storage systems are interconnected by a data link for remote mirroring of data. Each volume of data is configured as local, primary in a remotely mirrored volume pair, or secondary in a...
5991775 Method and system for dynamic cache allocation between record and track entries  
A data storage system provides generalized record caching through a control unit adapted to support track caching in the upper level store of a two level memory. Dynamic reallocation of space...
5901327 Bundling of write data from channel commands in a command chain for transmission over a data link between data storage systems for remote data mirroring  
Two data storage systems are interconnected by a data link for remote mirroring of data. Each volume of data is configured as local, primary in a remotely mirrored volume pair, or secondary in a...
5892633 Dynamic control of magnetic tape drive  
A magnetic tape drive dynamically adjusts a transport rate of tape (32) in accordance with a host data rate. The host data rate is assessed in relation to a data fill level of a buffer (116). A...
5889935 Disaster control features for remote data mirroring  
Two data storage systems are interconnected by a data link for remote mirroring of data. Each volume of data is configured as local, primary in a remotely mirrored volume pair, or secondary in a...
5860087 Data search method wherein the court-key-data (CKD) storage subsystem disconnects from the central processing unit when searching  
For a computer system having a central processing unit, an external storage unit which records data in a count-key-data (CKD) format, and a storage control unit with a cache memory for controlling...
5794056 System for automatic buffering of commands for DASD units  
A direct access storage device may handle various disk drive management functions without contemporaneous host computer involvement by buffering commands for the management functions in controller...
5761716 Rate based memory replacement mechanism for replacing cache entries when the cache is full  
A rate based mechanism for determining which data to replace in a cache when the cache is full. The computer system processes data, which are associated with multiple channels or processes. These...
EP0839355A1 DISK DRIVE DATA PROTECTION SYSTEM  
Abstract not available for EP0839355 Abstract of corresponding document: US5710943 The present invention provides a method and apparatus for assuring that the desired data is transferred between a...
5742792 Remote data mirroring  
Two data storage systems are interconnected by a data link for remote mirroring of data. Each volume of data is configured as local, primary in a remotely mirrored volume pair, or secondary in a...
5717888 Accessing cached data in a peripheral disk data storage system using a directory having track and cylinder directory entries  
In a data storage system having a direct access storage device (DASD) and a cache, a cache directory has two types of directory entries. A track directory entry TDE identifies up to one DASD track...
5710943 Time based data retention in a variable data rate disk drive  
The present invention provides a method and apparatus for assuring that the desired data is transferred between a variable rate disk drive and a host system during read and write operations. The...
5568628 Storage control method and apparatus for highly reliable storage controller with multiple cache memories  
A storage control unit is connected between a central processing unit having an interface for accessing a first disk unit into which data constructed of a plurality of variable length data records...
5555390 Data storage method and subsystem including a device controller for respecifying an amended start address  
A data storage subsystem and method for transferring data from a storage subsystem to a connected host data processing system are described. The subsystem comprises a device controller connected to...
5551003 System for managing log structured array (LSA) of DASDS by managing segment space availability and reclaiming regions of segments using garbage collection procedure  
Seek affinity is preserved in a segment oriented, cached, log structured array (LSA) of DASDs responsive to accesses dominated by sequential read and random writes of logical tracks stored in the...
EP0727749A2 Data search method  
For a computer system having a central processing unit (1), an external storage unit (3) which records data in a count-key-data (CKD) format, and a storage control unit (2) with a cache memory (6)...
5544347 Data storage system controlled remote data mirroring with respectively maintained data indices  
A data storage system which automatically provides and maintains identical secondary data on a preferably geographically remote secondary data storage device. The system includes a primary host...
5535372 Method and apparatus for efficient updating of CKD data stored on fixed block architecture devices  
A method and apparatus for updating CKD data stored on fixed block media, and more particularly to creating Track Format Descriptors which are data structures loaded into electronic memory to...
5530829 Track and record mode caching scheme for a storage system employing a scatter index table with pointer and a track directory  
A system and technique for storing data in a cache memory in record format and in track format. Space is allocated in cache memory for the storage of data in track format. Additional space is...
5522054 Dynamic control of outstanding hard disk read requests for sequential and random operations  
Computer system which varies the number of read requests outstanding to hard disk drives based on the mix of sequential and random requests. If a sequential request is received, a limited number of...
5446872 Method for error recovery in a non-synchronous control unit  
An error recovery process for a non-synchronous DASD control unit. A channel process within the control unit is able to operate on different fields from a device process within the control unit....
5426758 Method and system for accessing data from a multi-head data processing system utilizing a transducer head switching table  
A method and system for enhancing the efficiency of data accessing within a storage subsystem which is coupled to a host system via a storage subsystem controller and a data channel. The storage...
Matches 1 - 33 out of 33