US5832204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Efficient system for predicting and processing storage subsystem failure
Assignee: International Business Machines Corp
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Filing: 1997-06-23
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Granted: 1998-11-03
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Expires: 2017-06-23
Abstract
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.
Inventors
- 👤 Norman Apperley
- 👤 James Thomas Brady
- 👤 Steven Gerdt
- 👤 Alden B. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:15
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/20; G06F11/2053; G06F11/2094; G06F11/008; G06F11/08; G06F11/10; G06F11/1076; G06F11/1088
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
205 words
A method for data recovery in a storage system including a host coupled to a supervising processor coupled to a parity-equipped RAID storage subsystem having multiple head disk assemblies ("HDA") each HDA including an HDA controller and at least one storage medium, said method comprising the steps of: the supervising processor receiving from said host a Read request for reading target data; the supervising processor directing a first HDA to read the target data; the first HDA attempting to read the target data and detecting a data error during the attempt; the supervising processor executing a recovery process to reconstruct the target data by combining supplementary data and stored parity, said supplementary data comprising data corresponding to the target data and stored elsewhere in the RAID storage system than the first HDA, and said stored parity comprising parity corresponding to the target data and supplementary data and stored in the RAID storage subsystem; concurrently with the supervising processor executing the recovery process, the first HDA performing a selected predictive failure analysis ("PFA") to predict future failure of the at least one storage medium of the first HDA; and after completion of the recovery process, providing reconstructed target data from the supervising processor to the host.
Claim 2
Independent Claim
205 words
A method for data recovery in a storage system including a host coupled to a supervising processor coupled to a parity-equipped RAID storage subsystem having multiple head disk assemblies ("HDA") each HDA including an HDA controller and at least one storage medium, said method comprising the steps of: the supervising processor receiving from said host a Read request for reading target data; the supervising processor directing a first HDA to read the target data; the first HDA attempting to read the target data and detecting a data error during the attempt; the supervising processor executing a recovery process to reconstruct the target data by combining supplementary data and stored parity, said supplementary data comprising data corresponding to the target data and stored elsewhere in the RAID storage system than the first HDA, and said stored parity comprising parity corresponding to the target data and supplementary data and stored in the RAID storage subsystem; concurrently with the supervising processor executing the recovery process, the first HDA performing a selected predictive failure analysis ("PFA") to predict future failure of the at least one storage medium of the first HDA; and after completion of the recovery process, providing reconstructed target data from the supervising processor to the host.
Claim 3
Dependent Claim
16 words
The method of claim 1, the at least one storage medium being a single storage medium.
Claim 4
Dependent Claim
15 words
The method of claim 1, the at least one storage medium comprising multiple storage media.
Claim 5
Dependent Claim
31 words
The method of claim 1, further comprising the steps of: determining whether the recovery process or PFA completes first; and aborting the PFA in the event the recovery process completes first.
Claim 6
Dependent Claim
28 words
The method of claim 1, the step of the first HDA performing a selected PFA further including the steps of identifying potential causes of the predicted future failure.
Claim 7
Dependent Claim
234 words
A data storage medium tangibly embodying a computer-processor-readable program of instructions for causing a supervising processor and a first one of a multiple of head disk assemblies to perform method steps for data recovery in a storage system, which storage system including a parity-equipped RAID storage subsystem coupled to said supervising processor and having said multiple of head disk assemblies ("HDA"), each HDA including an HDA controller and at least one storage medium, said method steps comprising: the supervising processor receiving from said host a Read request for reading target data; the supervising processor directing a first HDA to read the target data; the first HDA attempting to read the target data and detecting a data error during the attempt; the supervising processor executing a recovery process to reconstruct the target data by combining supplementary data and stored parity, said supplementary data comprising data corresponding to the target data and stored elsewhere in the RAID storage system than the first HDA, and said stored parity comprising parity corresponding to the target data and supplementary data and stored in the RAID storage subsystem; concurrently with the supervising processor executing the recovery process, the first HDA performing a selected predictive failure analysis ("PFA") to predict future failure of the at least one storage medium of the first HDA; and after completion of the recovery process, providing reconstructed target data from the supervising processor to the host.
Claim 8
Dependent Claim
234 words
A data storage medium tangibly embodying a computer-processor-readable program of instructions for causing a supervising processor and a first one of a multiple of head disk assemblies to perform method steps for data recovery in a storage system, which storage system including a parity-equipped RAID storage subsystem coupled to said supervising processor and having said multiple of head disk assemblies ("HDA"), each HDA including an HDA controller and at least one storage medium, said method steps comprising: the supervising processor receiving from said host a Read request for reading target data; the supervising processor directing a first HDA to read the target data; the first HDA attempting to read the target data and detecting a data error during the attempt; the supervising processor executing a recovery process to reconstruct the target data by combining supplementary data and stored parity, said supplementary data comprising data corresponding to the target data and stored elsewhere in the RAID storage system than the first HDA, and said stored parity comprising parity corresponding to the target data and supplementary data and stored in the RAID storage subsystem; concurrently with the supervising processor executing the recovery process, the first HDA performing a selected predictive failure analysis ("PFA") to predict future failure of the at least one storage medium of the first HDA; and after completion of the recovery process, providing reconstructed target data from the supervising processor to the host.
Claim 9
Dependent Claim
18 words
The data storage medium of claim 6, the at least one storage medium being a single storage medium.
Claim 10
Dependent Claim
17 words
The data storage medium of claim 6, the at least one storage medium comprising multiple storage media.
Claim 11
Dependent Claim
33 words
The data storage device of claim 6, further comprising the steps of: determining whether the recovery process or PFA completes first; and aborting the PFA in the event the recovery process completes first.
Claim 12
Dependent Claim
30 words
The data storage medium of claim 6, the step of the first HDA performing a selected PFA further including the steps of identifying potential causes of the predicted future failure.
References Cited (Backward Citations)
US4048481A
Cited
US5333314A
Cited
US4989206A
Cited
US5148432A
Cited
US5088081A
Cited
US5124987A
Cited
US5263145A
Cited
US5220569A
Cited
US5347647A
Cited
US5357607A
Cited
US5261083A
Cited
US5239659A
Cited
US5257391A
Cited
US5313626A
Cited
US5371882A
Cited
US5550975A
Cited
US5359728A
Cited
US5270880A
Cited
US5410439A
Cited
US5608891A
Cited
US5386549A
Cited
US5623595A
Cited
US5539592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-11-02 | 2002-05-04 | 2002-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-02 | 2006-05-04 | 2006-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-02 | 2010-05-04 | 2010-11-03 | $7700.00 | Window Closed / Lapsed |