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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0654511 (1996-05-28) |
| 발명자 / 주소 |
|
| 출원인 / 주소 |
|
| 대리인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 841 인용 특허 : 0 |
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 accesses either a local or a primary vo
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 accesses either a local or a primary volume, and data written to a primary volume is automatically sent over the link to a corresponding secondary volume. Each remotely mirrored volume pair can operate in a selected synchronization mode including synchronous, semi-synchronous, adaptive copy - remote write pending, and adaptive copy - disk. Direct write access to a secondary volume is denied if a "sync required" attribute is set for the volume and the volume is not synchronized. If a "volume domino" mode is enabled for a remotely mirrored volume pair, access to a volume of the pair is denied when the other volume is inaccessible. In a "links domino" mode, access to all remotely mirrored volumes is denied when remote mirroring is disrupted by an all-links failure. The domino modes can be used to initiate application-based recovery, for example, recovering a secondary data file using a secondary log file. In an active migration mode, host processing of a primary volume is concurrent with migration to a secondary volume. In an overwrite cache mode, remote write-pending data in cache can be overwritten. Write data for an entire host channel command word chain is bundled in one link transmission.
[ What is claimed is:] [1.] A system for automatically providing remote copy data storage, said system comprising:a host computer;a first data storage system including at least a first data storage system controller and at least one data storage device, said first data storage system being coupled t
[ What is claimed is:] [1.] A system for automatically providing remote copy data storage, said system comprising:a host computer;a first data storage system including at least a first data storage system controller and at least one data storage device, said first data storage system being coupled to said host computer for storing data to be accessed by at least said host computer;a second data storage system including at least a second data storage system controller and at least one data storage device, said second data storage system being remotely coupled to said first data storage system for copying of said data to said second data storage system controller; andsaid first data storage system controller coordinating and controlling the copying of said data to said second data storage system controller wherein said first data storage system maintains an index, said index including at least a first indicator providing an indication of whether a predetermined data element stored on said first data storage system is valid, a second indicator providing an indication of whether said predetermined data element stored on said second data storage system is valid, a third indicator providing an indication of whether a write is pending to said predetermined data element stored on said first data storage system, and at least a fourth indicator providing an indication of whether a write is pending to said predetermined data element stored in said second data storage system.
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