RAID 1 read mirroring method for host adapters
US6728791B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 2002 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Aug 8, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2087
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A single host adapter hardware I/O control block contains information used to specify a transfer of data from a first target device to a host system and in addition information that specifies whether the data is mirrored, and if so, identifies a second target device on which the data is to be read. After transferring the single hardware I/O control block to the host adapter integrated circuit, the host adapter integrated circuit determines whether the hardware I/O control block specifies a mirrored transaction. If a mirrored transaction is specified, the host adapter integrated circuit generates a second hardware I/O control block for the second target device using the information in the first hardware I/O control block. When the execution of both hardware I/O control blocks is complete, the host adapter integrated circuit provides a single completion notification to the host system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.