Journaling ordered changes in a storage volume
US6189016A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1998 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Jun 12, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99954
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A change journal for recording changes to files in a storage volume of a computer system keeps a record for each notable change to a file. Each record is given a unique update sequence number, which is a serial number of ever-increasing value assigned to each record. Each record includes one or more change reasons specifying what type of action occurred with respect to the associated file. The presence of a close file change reason in a record connotes that the record includes all the notable changes made to the file in a preceding file session, which is defined as the time occurring after the last time a close file change reason was entered in a change record, up to the time of the next succeeding close file change reason. For each file, an entry is made in the storage volume's master file table referencing the change record that currently includes the most up-to-date information on the status of the change reasons for the file.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.