Centralized fine-grained enhancements for distributed table driven I/O mapping
US7720928B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2001 |
| Grant date | May 18, 2010 |
| Priority date | — |
| Expiry date | Aug 15, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1451
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A virtual storage system comprises an agent to store a first table to map virtual storage segments to storage locations, and a controller to store a second table and to intermittently cause contents of the first table to be replaced by contents of the second table. During an I/O operation, one of the entries in the first table can be accessed by a host to determine one of the storage locations. Also, a method for performing an I/O operation on a virtual storage segment, defined by first table that maps a storage segment to a first storage location, comprises turning off I/O operations at the first storage location, identifying portions of the virtual storage segment to be effected during a write operation, storing a record of identified portions at a second table not the first table, and writing to portions of the second storage location associated with the identified portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.