Method and apparatus for asynchronously updating a mirror of a source device
US6157991A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 1, 1998 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Apr 1, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2066
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a computer system including a CPU, a first storage system coupled to the CPU, a second storage system, and a communication link coupling the second storage system to the first storage system, a method and apparatus for asynchronously mirroring, to the second storage system, a plurality of units of data written by the CPU to the first storage system. In one aspect of the invention, the CPU writes units of data to the first storage system in a first order, and the units of data are asynchronously transmitted over the communication link from the first storage system to the second storage system in a second order that is different than the first order. In another aspect, the units of data are committed in the second storage system in an order that is independent of the order in which the units of data are received at the second storage system. In a further aspect of the invention, a packet of information is transmitted over the communication link to the target storage system to specify a commitment order in which the units of data should be committed in the target storage system. In another aspect of the invention, a single copy of each of the units of data is written into the first…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.