System and method for enabling pair-pair remote copy storage volumes to mirror data in another storage volume
US6237008A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 1998 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Jul 20, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99955
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data storage system includes at least first, second and third virtual storage volumes, the second and third virtual storage volumes being remotely coupled as a PPRC pair to enable a mirroring of data therebetween. The storage system is responsive to a snapshot command from a host processor, to cause transfer of the directory of the first virtual storage volume to the second virtual storage volume. The storage system then invokes a PPRC mirroring procedure which (i) detects an unsynchronized condition between the second and third virtual storage volumes (upon transfer of the directory from the first virtual storage volume to the second virtual storage volume), and (ii) causes a transfer of data, pointed to by the transferred directory, to the third virtual storage volume, until the second and third virtual storage volumes are again in synchronism. This action achieves a synchronization of the first and third virtual storage volumes, while the first virtual storage volume is relieved from certain processing overhead incident to transfer of data to the remotely located third virtual storage volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.