System and method for mirroring memory with restricted access to main physical mirrored memory
US6671786B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2001 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | May 30, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2074
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention includes a method of mirroring memory that reduces the down time for copying information from one physical memory subsystem to a redundant physical memory subsystem by separating the mirroring process into phases. The first phase copies information from the first physical memory subsystem to the redundant physical memory subsystem. During the first phase, applications are not restricted from accessing the first memory subsystem while the first phase of the memory mirroring operation copies the information. The second phase of the memory mirroring operation copies active information to the redundant physical memory subsystem. The active information includes information that was not copied during the first phase and information that changed during the first phase. During the second phase, applications are restricted from accessing the first physical memory subsystem. Because the second phase typically copies a smaller amount of information than the first phase, the down time associated with mirroring the memory is minimal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.