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| Number | Title | Issue Date |
| 7240238 | 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 remotely mirrored volume pair. Normally, a host computer directly acces... | 07/03/2007 |
| 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 remotely mirrored volume pair. Normally, a host computer directly acces... | 05/30/2006 |
| 6549921 | Method and apparatus for performing point in time backup operation in a computer system A data network with a remote data facility for providing redundant data storage and for enabling concurrent point-in-time backup operations. A local data processing system with a data facility stores a data base and processes applications. A second system... | 04/15/2003 |
| 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 remotely mirrored volume pair. Normally, a host computer dir... | 12/31/2002 |
| 6347335 | System using a common and local event logs for logging event information generated by plurality of devices for determining problem in storage access operations A distributed computer system includes a plurality of computer nodes, including conventional digital computer systems, mass storage subsystems, servers and the like, and a common event log. The common event log includes a plurality of storage locations fo... | 02/12/2002 |
| 6321308 | Method and apparatus for managing access requests from a plurality of devices using dual level queue locking scheme and a doubly-linked circular queue A method of managing a storage system which includes a local and remote systems is provided. Link services between the two subsystems are provided though the use of a task queue. The task queue resides in a global memory of the local storage system and re... | 11/20/2001 |
| 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 remotely mirrored volume pair. Normally, a host computer dir... | 01/09/2001 |
| 6092066 | Method and apparatus for independent operation of a remote data facility A data network with a remote data facility for providing redundant data storage and for enabling concurrent access to the data for multiple purposes. A local data processing system with a data facility stores a data base and processes transactions or othe... | 07/18/2000 |
| 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 remotely mirrored volume pair. Normally, a host computer dir... | 03/28/2000 |
| 6038605 | Method and apparatus for interfacing two remotely disposed devices coupled via a transmission medium A method and apparatus for interfacing two ESCON compatible devices over a communication channel that is not dedicated solely to ESCON communication, such as a public communication network or links, for example, a T1 or T3 line. The devices may include a ... | 03/14/2000 |
| 5960216 | Method and apparatus for interfacing two remotely disposed devices coupled via a transmission medium A method and apparatus for interfacing two ESCON compatible devices over a communication channel that is not dedicated solely to ESCON communication, such as a public communication network or links, for example, a T1 or T3 line. The devices may include a ... | 09/28/1999 |
| 5933653 | Method and apparatus for mirroring data in a remote data storage system A data processing network including a local system and a geographically remote system. Each of the local and remote systems includes a data storage facility. The remote data storage facility mirrors the local data storage facility. In a normal operating m... | 08/03/1999 |
| 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 remotely mirrored volume pair. Normally, a host computer dir... | 05/04/1999 |
| 5857208 | Method and apparatus for performing point in time backup operation in a computer system A data network with a remote data facility for providing redundant data storage and for enabling concurrent point-in-time backup operations. A local data processing system with a data facility stores a data base and processes applications. A second system... | 01/05/1999 |
| 5829048 | Reset propagation for a multi-port storage controller A mass storage system having a storage controller connnecting a plurality of host computers to an array of disk drives provides a method and apparatus for propagating a reset command from the host computer to other host computers. The storage controller i... | 10/27/1998 |
| 5819310 | Method and apparatus for reading data from mirrored logical volumes on physical disk drives A mirrored memory for a data processing system. The memory system includes two device controllers and related disk drives for storing the mirrored data. Each of the disk drives is divided into logical volumes. Each device controller contains a plurality o... | 10/06/1998 |
| 5787473 | Cache management system using time stamping for replacement queue A shared system memory buffers data transfers between a plurality of host computers and a plurality of data storage devices. The system memory includes a cache memory and a number of queues and structures to facilitate performance. Management of a replace... | 07/28/1998 |
| 5751993 | Cache management system A shared system memory buffers data transfers between a plurality of host computers and a plurality of data storage devices. The system memory includes a cache memory and a number of queues and structures to facilitate performance. Management of a replace... | 05/12/1998 |
| 5706467 | Sequential cache management system utilizing the establishment of a microcache and managing the contents of such according to a threshold comparison A shared system memory buffers data transfers between a plurality of host computers and a plurality of data storage devices. Management of the system memory includes establishing a replacement queue to facilitate performance. When a sequential operation i... | 01/06/1998 |
| 5680640 | System for migrating data by selecting a first or second transfer means based on the status of a data element map initialized to a predetermined state A system and method for providing on-line, real-time, transparent data migration from a first data storage system to a second data storage system. The first data storage system which had previously been coupled to a host, network or other data processing ... | 10/21/1997 |
