Enhanced I/O subsystem recovery and availability on the IBM System z9.
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| Title: | Enhanced I/O subsystem recovery and availability on the IBM System z9. |
|---|---|
| Authors: | Oakes, K. J.1 oakes@us.ibm.com, Helmich, U.2 helmich@de.ibm.com, Kohler, A.2 akohler@de.ibm.com, Piechowski, A. W.1 fireman@us.ibm.com, Taubert, M.2 taubert@de.ibm.com, Trotter, J. S.1 trotterj@us.ibm.com, Von Buttlar, J.2 Joachim_von_buttlar@de.ibm.com, Whalen Jr., R. M.1 rmwhalen@us.ibm.com |
| Source: | IBM Journal of Research & Development. Jan/Mar2007, Vol. 51 Issue 1/2, p131-144. 14p. |
| Subjects: | Systems design, IBM computer peripherals, Error messages (Computer science), Data recovery, Client/server computing |
| Abstract: | Although part of the IBM System z™ strategy is to improve design and development processes to prevent errors from escaping to the field, improving recovery is another element in the strategy to keep a machine up and running should an error occur. The z9™ continues on an evolutionary path of enhancing I/O subsystem (IOSS) recovery to further advance the reliability, availability, and serviceability (RAS) of System z platforms. This paper presents an overview of recovery and how it interacts with other RAS functions--such as error-detection mechanisms in hardware, including automatic identification and recovery of failing elements--up to the point in time prior to the advent of the z9. It then presents the innovations to IOSS recovery and error detection in the z9 that further improve machine availability. The recovery infrastructure, which significantly reduces recovery time and makes recovery much less dependent on machine scaling for this and future generations of System z servers, is described. Also described are such innovative uses of this new infrastructure as improvements in error detection related to elusive firmware problems seen in prior machines, the ability to detect and recover from firmware hangs or lockups related to inadvertently leaving control blocks locked, and the capability to perform recovery in parallel by multiple system-assist processors. [ABSTRACT FROM AUTHOR] |
| Copyright of IBM Journal of Research & Development is the property of IBM Corporation/IBM Journals and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 24672740 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Enhanced I/O subsystem recovery and availability on the IBM System z9. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Oakes%2C+K%2E+J%2E%22">Oakes, K. J.</searchLink><relatesTo>1</relatesTo><i> oakes@us.ibm.com</i><br /><searchLink fieldCode="AR" term="%22Helmich%2C+U%2E%22">Helmich, U.</searchLink><relatesTo>2</relatesTo><i> helmich@de.ibm.com</i><br /><searchLink fieldCode="AR" term="%22Kohler%2C+A%2E%22">Kohler, A.</searchLink><relatesTo>2</relatesTo><i> akohler@de.ibm.com</i><br /><searchLink fieldCode="AR" term="%22Piechowski%2C+A%2E+W%2E%22">Piechowski, A. W.</searchLink><relatesTo>1</relatesTo><i> fireman@us.ibm.com</i><br /><searchLink fieldCode="AR" term="%22Taubert%2C+M%2E%22">Taubert, M.</searchLink><relatesTo>2</relatesTo><i> taubert@de.ibm.com</i><br /><searchLink fieldCode="AR" term="%22Trotter%2C+J%2E+S%2E%22">Trotter, J. S.</searchLink><relatesTo>1</relatesTo><i> trotterj@us.ibm.com</i><br /><searchLink fieldCode="AR" term="%22Von+Buttlar%2C+J%2E%22">Von Buttlar, J.</searchLink><relatesTo>2</relatesTo><i> Joachim_von_buttlar@de.ibm.com</i><br /><searchLink fieldCode="AR" term="%22Whalen+Jr%2E%2C+R%2E+M%2E%22">Whalen Jr., R. M.</searchLink><relatesTo>1</relatesTo><i> rmwhalen@us.ibm.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22IBM+Journal+of+Research+%26+Development%22">IBM Journal of Research & Development</searchLink>. Jan/Mar2007, Vol. 51 Issue 1/2, p131-144. 14p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Systems+design%22">Systems design</searchLink><br /><searchLink fieldCode="DE" term="%22IBM+computer+peripherals%22">IBM computer peripherals</searchLink><br /><searchLink fieldCode="DE" term="%22Error+messages+%28Computer+science%29%22">Error messages (Computer science)</searchLink><br /><searchLink fieldCode="DE" term="%22Data+recovery%22">Data recovery</searchLink><br /><searchLink fieldCode="DE" term="%22Client%2Fserver+computing%22">Client/server computing</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Although part of the IBM System z™ strategy is to improve design and development processes to prevent errors from escaping to the field, improving recovery is another element in the strategy to keep a machine up and running should an error occur. The z9™ continues on an evolutionary path of enhancing I/O subsystem (IOSS) recovery to further advance the reliability, availability, and serviceability (RAS) of System z platforms. This paper presents an overview of recovery and how it interacts with other RAS functions--such as error-detection mechanisms in hardware, including automatic identification and recovery of failing elements--up to the point in time prior to the advent of the z9. It then presents the innovations to IOSS recovery and error detection in the z9 that further improve machine availability. The recovery infrastructure, which significantly reduces recovery time and makes recovery much less dependent on machine scaling for this and future generations of System z servers, is described. Also described are such innovative uses of this new infrastructure as improvements in error detection related to elusive firmware problems seen in prior machines, the ability to detect and recover from firmware hangs or lockups related to inadvertently leaving control blocks locked, and the capability to perform recovery in parallel by multiple system-assist processors. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of IBM Journal of Research & Development is the property of IBM Corporation/IBM Journals and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1147/rd.511.0131 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 14 StartPage: 131 Subjects: – SubjectFull: Systems design Type: general – SubjectFull: IBM computer peripherals Type: general – SubjectFull: Error messages (Computer science) Type: general – SubjectFull: Data recovery Type: general – SubjectFull: Client/server computing Type: general Titles: – TitleFull: Enhanced I/O subsystem recovery and availability on the IBM System z9. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Oakes, K. J. – PersonEntity: Name: NameFull: Helmich, U. – PersonEntity: Name: NameFull: Kohler, A. – PersonEntity: Name: NameFull: Piechowski, A. W. – PersonEntity: Name: NameFull: Taubert, M. – PersonEntity: Name: NameFull: Trotter, J. S. – PersonEntity: Name: NameFull: Von Buttlar, J. – PersonEntity: Name: NameFull: Whalen Jr., R. M. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: Jan/Mar2007 Type: published Y: 2007 Identifiers: – Type: issn-print Value: 00188646 Numbering: – Type: volume Value: 51 – Type: issue Value: 1/2 Titles: – TitleFull: IBM Journal of Research & Development Type: main |
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