Method for enabling overlapped input/output requests to a logical device using assigned and parallel access unit control blocks
US6665739B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2000 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Dec 30, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0689
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for enabling overlapped input/output requests to a logical device using assigned and parallel access unit control blocks. Each I/O request interrupts an operating system to assign a base and related unit control block to the input/output requests. In addition a parallel access control block is associated with each unit control block for a logical volume and a parallel access main control block is established with a logical volume through which each of the base and related unit control block can be identified. An input/output request to a logical device interrupts the operating system to assign one of the base and one of the assigned unit control blocks to the input/output requests after which control transfers back to the operating system. At a disk storage facility, the input/output request is located in a table with other input/output requests and corresponding parameters. The disk array storage facility tests the parameters for each new input/output request to determine which of a plurality of control functions will be performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.