Efficient system for predicting and processing storage subsystem failure
US5832199A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1997 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Jun 23, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1088
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Predictive failure analysis of a storage subsystem is efficiently conducted and data quickly recovered from a failed Read operation. This may be implemented in a storage system including a host coupled to a supervising processor that couples to a parity-equipped RAID storage subsystem having multiple HDAs each including an HDA controller and at least one storage medium. In one embodiment, when an HDA experiences an error during a Read attempt, the HDA transmits a recovery alert signal to the supervising processor; then, the processor and HDA begin remote and local recovery processes in parallel. The first process to complete provides the data to the host, and the second process is aborted. In another embodiment, an HDA's PFA operations are restricted to idle times of the HDA. A different embodiment limits HDA performance of PFA to times when the processor is conducting data reconstruction. Another embodiment monitors HDA errors at the supervisory processor level, initiating an HDA's PFA operations when errors at that HDA have a certain characteristic, such as a predetermined frequency of occurrence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.