Patent US6044444A successfully refreshed from Google Patents.
US6044444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote data mirroring having preselection of automatic recovery or intervention required when a disruption is detected
Assignee: EMC Corp
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Filing: 1997-03-17
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Granted: 2000-03-28
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Expires: 2017-03-17
Abstract
Abstract Two data storage systems are interconnected by a data link for remote mirroring of data. Each volume of data is configured as local, primary in a remotely mirrored volume pair, or secondary in a remotely mirrored volume pair. Normally, a host computer directly accesses either a local or a primary volume, and data written to a primary volume is automatically sent over the link to a corresponding secondary volume. Each remotely mirrored volume pair can operate in a selected synchronization mode including synchronous, semi-synchronous, adaptive copy-remote write pending, and adaptive copy-disk. A number of automatic and non-automatic recovery mechanisms are provided on a logical volume basis for a desired level of data integrity and degree of operator or application program involvement. If a "volume domino" mode is enabled for a remotely mirrored volume pair, access to a volume of the pair is denied when the other volume is inaccessible. In a "links domino" mode, access to all remotely mirrored volumes is denied when remote mirroring is disrupted by an all-links failure. The domino modes can be used to initiate application-based recovery, for example, recovering a secondary data file using a secondary log file. In an overwrite cache mode, remote write-pending data in cache can be overwritten. In a "log-in-cache" mode, multiple versions of write data can be stored in cache in order to recover from a "rolling disaster".
Inventors
- 👤 Yuval Ofek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:06
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/20; G06F11/2053; G06F11/2056; G06F11/2071; G06F11/2066; G06F11/2079; G06F11/2082
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
220 words
A data processing system comprising: a first data storage system; a second data storage system; and a data link coupled between said first data storage system and said second data storage system for transmission of remote copy data from said first data storage system to said second data storage system; wherein said first data storage system is operational in a remote copy mode in which data is stored in a primary volume of data storage in said first data storage system and is transmitted over said data link and stored in a respective secondary volume of data storage in said second data storage system; and said first data storage system includes a controller for detecting an occurrence of a disruption in operation of the data processing system preventing an access to said primary volume, and upon detecting said occurrence of said disruption in operation of the data processing system preventing said access to said primary volume, checking whether an automatic recovery mode has been preselected for said primary volume, and when said automatic recovery mode has been preselected for said primary volume, automatically accessing said secondary volume in lieu of said primary volume, and when said automatic recovery mode has not been preselected for said primary volume, not automatically accessing said secondary volume and instead signaling that intervention is required.
Claim 2
Dependent Claim
220 words
A data processing system comprising: a first data storage system; a second data storage system; and a data link coupled between said first data storage system and said second data storage system for transmission of remote copy data from said first data storage system to said second data storage system; wherein said first data storage system is operational in a remote copy mode in which data is stored in a primary volume of data storage in said first data storage system and is transmitted over said data link and stored in a respective secondary volume of data storage in said second data storage system; and said first data storage system includes a controller for detecting an occurrence of a disruption in operation of the data processing system preventing an access to said primary volume, and upon detecting said occurrence of said disruption in operation of the data processing system preventing said access to said primary volume, checking whether an automatic recovery mode has been preselected for said primary volume, and when said automatic recovery mode has been preselected for said primary volume, automatically accessing said secondary volume in lieu of said primary volume, and when said automatic recovery mode has not been preselected for said primary volume, not automatically accessing said secondary volume and instead signaling that intervention is required.
Claim 3
Dependent Claim
94 words
The data processing system as claimed in claim 1, wherein the data storage in the first data storage system and the data storage in the second data storage system are configured to define volume pairs, each volume pair including a primary volume in one of the first data storage system and the second data storage system and a corresponding secondary volume in another of the first data storage system and the second data storage system, said volume pairs including primary volumes each having an attribute for selecting or not selecting said automatic recovery mode.
Claim 4
Dependent Claim
122 words
The data processing system as claimed in claim 1, wherein said controller has control logic for detecting an occurrence of a disruption in operation of the data processing system preventing an access to said secondary volume, and upon detecting said occurrence of said disruption in operation of the data processing system preventing said access to said secondary volume, checking whether said automatic recovery mode has been preselected for said secondary volume, and when said automatic recovery mode has been preselected for said secondary volume, automatically accessing said primary volume in lieu of said secondary volume, and when said automatic recovery mode has not been preselected for said secondary volume, not automatically accessing said primary volume and instead signaling that intervention is required.
Claim 5
Dependent Claim
102 words
The data processing system as claimed in claim 1, wherein the data storage in said first data storage system and in said second data storage system are configured to define volume pairs, each volume pair including a primary volume in one of the first data storage system and the second data storage system and a corresponding secondary volume in another of the first data storage system and the second data storage system, each volume pair having an attribute for selecting or not selecting said automatic recovery mode with respect to the primary volume and the secondary volume in said each volume pair.
Claim 6
Dependent Claim
37 words
The data processing system as claimed in claim 1, wherein the controller includes control logic for sending an "intervention required" message to an operating system of a host computer in order to signal that intervention is required.
Claim 7
Dependent Claim
177 words
A data storage system comprising: primary data storage; and a data storage controller programmed to operate in a remote copy mode in which data is stored in a primary volume of the primary data storage and is transmitted over a data link to remote data storage for storage in a respective secondary volume of the remote data storage; wherein said data storage controller is further programmed to detect an occurrence of a disruption in operation of the data storage system preventing an access to said primary volume, and upon detecting said occurrence of said disruption in operation of the data storage system preventing said access to said primary volume, to check whether an automatic recovery mode has been preselected for said primary volume, and when said automatic recovery mode has been preselected for said primary volume, to automatically access said secondary volume in lieu of said primary volume, and when said automatic recovery mode has not been preselected for said primary volume, to not automatically access said secondary volume and instead to signal that intervention is required.
Claim 8
Dependent Claim
177 words
A data storage system comprising: primary data storage; and a data storage controller programmed to operate in a remote copy mode in which data is stored in a primary volume of the primary data storage and is transmitted over a data link to remote data storage for storage in a respective secondary volume of the remote data storage; wherein said data storage controller is further programmed to detect an occurrence of a disruption in operation of the data storage system preventing an access to said primary volume, and upon detecting said occurrence of said disruption in operation of the data storage system preventing said access to said primary volume, to check whether an automatic recovery mode has been preselected for said primary volume, and when said automatic recovery mode has been preselected for said primary volume, to automatically access said secondary volume in lieu of said primary volume, and when said automatic recovery mode has not been preselected for said primary volume, to not automatically access said secondary volume and instead to signal that intervention is required.
Claim 9
Dependent Claim
125 words
The data storage system of claim 6, wherein said data storage controller is programmed to detect an occurrence of a disruption in operation of the data storage system preventing an access to said secondary volume, and upon detecting said occurrence of said disruption in operation of the data storage system preventing said access to said secondary volume, to check whether said automatic recovery mode has been preselected for said secondary volume, and when said automatic recovery mode has been preselected for said secondary volume, to automatically access said primary volume in lieu of said secondary volume, and when said automatic recovery mode has not been preselected for said secondary volume, to not automatically access said primary volume and instead to signal that intervention is required.
Claim 10
Dependent Claim
199 words
A program storage device readable by a data storage system, said program storage device encoding a program for execution by the data storage system for controlling operation of the data storage system in a remote copy mode in which data is stored in a primary volume of primary data storage of the data storage system and is transmitted over a data link to remote data storage for storage in a respective secondary volume of the remote data storage; wherein said program is executable by the data storage system to detect an occurrence of a disruption in operation of the data storage system preventing an access to said primary volume, and upon detecting said occurrence of said disruption in operation of the data storage system preventing said access to said primary volume, to check whether an automatic recovery mode has been preselected for said primary volume, and when said automatic recovery mode has been preselected for said primary volume, to automatically access said secondary volume in lieu of said primary volume, and when said automatic recovery mode has not been preselected for said primary volume, to not automatically access said secondary volume and instead to signal that intervention is required.
Claim 11
Dependent Claim
199 words
A program storage device readable by a data storage system, said program storage device encoding a program for execution by the data storage system for controlling operation of the data storage system in a remote copy mode in which data is stored in a primary volume of primary data storage of the data storage system and is transmitted over a data link to remote data storage for storage in a respective secondary volume of the remote data storage; wherein said program is executable by the data storage system to detect an occurrence of a disruption in operation of the data storage system preventing an access to said primary volume, and upon detecting said occurrence of said disruption in operation of the data storage system preventing said access to said primary volume, to check whether an automatic recovery mode has been preselected for said primary volume, and when said automatic recovery mode has been preselected for said primary volume, to automatically access said secondary volume in lieu of said primary volume, and when said automatic recovery mode has not been preselected for said primary volume, to not automatically access said secondary volume and instead to signal that intervention is required.
Claim 12
Dependent Claim
130 words
The program storage device as claimed in claim 8, wherein said program is executable by the data storage system to detect an occurrence of a disruption in operation of the data storage system preventing an access to said secondary volume, and upon detecting said occurrence of said disruption in operation of the data storage system preventing said access to said secondary volume, to check whether said automatic recovery mode has been preselected for said secondary volume, and when said automatic recovery mode has been preselected for said secondary volume, to automatically access said primary volume in lieu of said secondary volume, and when said automatic recovery mode has not been preselected for said secondary volume, to not automatically access said primary volume and instead to signal that intervention is required.
Claim 13
Independent Claim
354 words
A method of recovering from disruptions in a data processing system, said data processing system having a first data storage system, a second data storage system, and a data link coupled between said first data storage system and said second data storage system for transmission of remote copy data from said first data storage system to said second data storage system; said method comprising the steps of: (a) configuring the data storage in said first data storage system and in said second data storage system to define volume pairs each including a primary volume in said first data storage system and a corresponding secondary volume in the second data storage system, said volume pairs including primary volumes each having an attribute for selecting or not selecting an automatic recovery mode; (b) operating said data processing system in a remote copy mode in which data is stored in the primary volumes of data storage in said first data storage system and is transmitted over said data link and stored in the corresponding secondary volumes of data storage in said second data storage system; (c) detecting an occurrence of a disruption in operation of the data processing system preventing an access to a primary volume having said attribute selecting said automatic recovery mode, and upon detecting said occurrence of said disruption in operation of the data processing system preventing said access to the primary volume having said attribute selecting said automatic recovery mode, automatically accessing the secondary volume in the volume pair including the primary volume having said attribute selecting said automatic recovery mode; and (d) detecting an occurrence of a disruption in operation of the data processing system preventing an access to a primary volume having said attribute not selecting said automatic recovery mode, and upon detecting said occurrence of said disruption in operation of the data processing system preventing said access to the primary volume having said attribute not selecting said automatic recovery mode, not automatically accessing the secondary volume in the volume pair including the primary volume having said attribute not selecting said automatic recovery mode, and instead signaling that intervention is required.
Claim 14
Independent Claim
354 words
A method of recovering from disruptions in a data processing system, said data processing system having a first data storage system, a second data storage system, and a data link coupled between said first data storage system and said second data storage system for transmission of remote copy data from said first data storage system to said second data storage system; said method comprising the steps of: (a) configuring the data storage in said first data storage system and in said second data storage system to define volume pairs each including a primary volume in said first data storage system and a corresponding secondary volume in the second data storage system, said volume pairs including primary volumes each having an attribute for selecting or not selecting an automatic recovery mode; (b) operating said data processing system in a remote copy mode in which data is stored in the primary volumes of data storage in said first data storage system and is transmitted over said data link and stored in the corresponding secondary volumes of data storage in said second data storage system; (c) detecting an occurrence of a disruption in operation of the data processing system preventing an access to a primary volume having said attribute selecting said automatic recovery mode, and upon detecting said occurrence of said disruption in operation of the data processing system preventing said access to the primary volume having said attribute selecting said automatic recovery mode, automatically accessing the secondary volume in the volume pair including the primary volume having said attribute selecting said automatic recovery mode; and (d) detecting an occurrence of a disruption in operation of the data processing system preventing an access to a primary volume having said attribute not selecting said automatic recovery mode, and upon detecting said occurrence of said disruption in operation of the data processing system preventing said access to the primary volume having said attribute not selecting said automatic recovery mode, not automatically accessing the secondary volume in the volume pair including the primary volume having said attribute not selecting said automatic recovery mode, and instead signaling that intervention is required.
Claim 15
Dependent Claim
208 words
The method as claimed in claim 10, wherein said volume pairs include secondary volumes each having an attribute for selecting or not selecting said automatic recovery mode, and wherein said method further includes the steps of: (e) detecting an occurrence of a disruption in operation of the data processing system preventing an access to a secondary volume having said attribute selecting said automatic recovery mode, and upon detecting said occurrence of said disruption in operation of the data processing system preventing said access to the secondary volume having said attribute selecting said automatic recovery mode, automatically accessing the primary volume in the volume pair including the secondary volume having said attribute selecting said automatic recovery mode; and (f) detecting an occurrence of a disruption in operation of the data processing system preventing an access to a secondary volume having said attribute not selecting said automatic recovery mode, and upon detecting said occurrence of said disruption in operation of the data processing system preventing said access to the secondary volume having said attribute rot selecting said automatic recovery mode, not automatically accessing the primary volume in the volume pair including the secondary volume having said attribute not selecting said automatic recovery mode, and instead signaling that intervention is required.
Claim 16
Dependent Claim
34 words
The method as claimed in claim 10, wherein the first data storage system sends an "intervention required" message to an operating system of a host computer in order to signal that intervention is required.
Claim 17
Dependent Claim
270 words
A data processing system comprising: a first data storage system; a second data storage system; and a data link coupled between said first data storage system and said second data storage system for transmission of data from said first data storage system to said second data storage system; wherein said first data storage system is operational in a remote copy mode in which remote copy data is stored in data storage in said first data storage system and is transmitted over said data link and stored in data storage in said second data storage system; and said first data storage system includes a controller for detecting a failure of said data link preventing the remote copy data from being transmitted to said second data storage system for storage in the data storage in said second data storage system, and upon detecting said failure of said data link preventing the remote copy data from being transmitted to said second data storage system for storage in the data storage in said second data storage system, checking whether an automatic recovery mode has been preselected for use in case of link failure, and when said automatic recovery mode has been preselected for use in case of link failure, permitting continued access to the remote copy data in the data storage in the first data storage system without intervention, and when said automatic recovery mode has not been preselected for use in case of link failure, not permitting continued access to the remote copy data in the data storage of the first data storage system without intervention and instead signaling that intervention is required.
Claim 18
Dependent Claim
270 words
A data processing system comprising: a first data storage system; a second data storage system; and a data link coupled between said first data storage system and said second data storage system for transmission of data from said first data storage system to said second data storage system; wherein said first data storage system is operational in a remote copy mode in which remote copy data is stored in data storage in said first data storage system and is transmitted over said data link and stored in data storage in said second data storage system; and said first data storage system includes a controller for detecting a failure of said data link preventing the remote copy data from being transmitted to said second data storage system for storage in the data storage in said second data storage system, and upon detecting said failure of said data link preventing the remote copy data from being transmitted to said second data storage system for storage in the data storage in said second data storage system, checking whether an automatic recovery mode has been preselected for use in case of link failure, and when said automatic recovery mode has been preselected for use in case of link failure, permitting continued access to the remote copy data in the data storage in the first data storage system without intervention, and when said automatic recovery mode has not been preselected for use in case of link failure, not permitting continued access to the remote copy data in the data storage of the first data storage system without intervention and instead signaling that intervention is required.
Claim 19
Dependent Claim
37 words
The data processing system as claimed in claim 13, wherein the controller includes control logic for sending an "intervention required" message to an operating system of a host computer in order to signal that intervention is required.
Claim 20
Dependent Claim
186 words
A data storage system comprising: primary data storage; and a data storage controller programmed to operate in a remote copy mode in which remote copy data is stored in the primary data storage and is transmitted over a data link to remote data storage; wherein said data storage controller is further programmed to detect a failure of said data link preventing the remote copy data from being transmitted to said remote data storage, and upon detecting said failure of said data link preventing the remote copy data from being transmitted to said remote data storage, to check whether an automatic recovery mode has been preselected for use in case of link failure, and when said automatic recovery mode has been preselected for use in case of link failure, to permit continued access to the remote copy data in the primary data storage without intervention, and when said automatic recovery mode has not been preselected for use in case of link failure, to not permit continued access to the remote copy data in the primary data storage without intervention and instead to signal that intervention is required.
Claim 21
Dependent Claim
186 words
A data storage system comprising: primary data storage; and a data storage controller programmed to operate in a remote copy mode in which remote copy data is stored in the primary data storage and is transmitted over a data link to remote data storage; wherein said data storage controller is further programmed to detect a failure of said data link preventing the remote copy data from being transmitted to said remote data storage, and upon detecting said failure of said data link preventing the remote copy data from being transmitted to said remote data storage, to check whether an automatic recovery mode has been preselected for use in case of link failure, and when said automatic recovery mode has been preselected for use in case of link failure, to permit continued access to the remote copy data in the primary data storage without intervention, and when said automatic recovery mode has not been preselected for use in case of link failure, to not permit continued access to the remote copy data in the primary data storage without intervention and instead to signal that intervention is required.
Claim 22
Dependent Claim
193 words
A program storage device readable by a data storage system, said program storage device encoding a program for execution by the data storage system for controlling operation in a remote copy mode in which remote copy data is stored in primary data storage of the data storage system and is transmitted over a data link to remote data storage, wherein said program s executable by the data storage system to detect a failure of said data link preventing the remote copy data from being transmitted to said remote data storage, and upon detecting said failure of said data link preventing the remote copy data from being transmitted to said remote data storage, to check whether an automatic recovery mode has been preselected for use in case of link failure, and when said automatic recovery mode has been preselected for use in case of link failure, to permit continued access to the remote copy data without intervention, and when said automatic recovery mode has not been preselected for use in case of link failure, to not permit continued access to the remote copy data without intervention and instead to signal that intervention is required.
Claim 23
Dependent Claim
193 words
A program storage device readable by a data storage system, said program storage device encoding a program for execution by the data storage system for controlling operation in a remote copy mode in which remote copy data is stored in primary data storage of the data storage system and is transmitted over a data link to remote data storage, wherein said program s executable by the data storage system to detect a failure of said data link preventing the remote copy data from being transmitted to said remote data storage, and upon detecting said failure of said data link preventing the remote copy data from being transmitted to said remote data storage, to check whether an automatic recovery mode has been preselected for use in case of link failure, and when said automatic recovery mode has been preselected for use in case of link failure, to permit continued access to the remote copy data without intervention, and when said automatic recovery mode has not been preselected for use in case of link failure, to not permit continued access to the remote copy data without intervention and instead to signal that intervention is required.
Claim 24
Independent Claim
341 words
A method of operating a data processing system, said data processing system including a first data storage system, a second data storage system, a data link coupled between said first data storage system and said second data storage system for transmission of remote copy data from said first data storage system to said second data storage system, and a host computer coupled to said first data storage system for access to data storage in said first data storage system; said method comprising the steps of: (a) selecting whether or not an automatic recovery mode should be used in case of link failure; and then (b) operating said data processing system in a remote copy mode in which remote copy data is stored in the data storage in said first data storage system and is transmitted over said data link and stored in data storage in said second data storage system; and (c) detecting a failure of said data link preventing data stored in the data storage in said first data storage system from being transmitted to said second data storage system for storage in the data storage in said second data storage system, and upon detecting said failure of said data link preventing remote copy data stored in the data storage in said first data storage system from being transmitted to said second data storage system for storage in the data storage in said second data storage system, checking whether said automatic recovery mode has been preselected for use in case of link failure, and when said automatic recovery mode has been preselected for use in case of link failure, permitting said host computer to continue to access the remote copy data in the data storage in the first data storage system without intervention, and when said automatic recovery mode has not been preselected for use in case of link failure, not permitting said host computer to access the remote copy data in the data storage in the first data storage system without intervention and instead signaling that intervention is required.
Claim 25
Independent Claim
341 words
A method of operating a data processing system, said data processing system including a first data storage system, a second data storage system, a data link coupled between said first data storage system and said second data storage system for transmission of remote copy data from said first data storage system to said second data storage system, and a host computer coupled to said first data storage system for access to data storage in said first data storage system; said method comprising the steps of: (a) selecting whether or not an automatic recovery mode should be used in case of link failure; and then (b) operating said data processing system in a remote copy mode in which remote copy data is stored in the data storage in said first data storage system and is transmitted over said data link and stored in data storage in said second data storage system; and (c) detecting a failure of said data link preventing data stored in the data storage in said first data storage system from being transmitted to said second data storage system for storage in the data storage in said second data storage system, and upon detecting said failure of said data link preventing remote copy data stored in the data storage in said first data storage system from being transmitted to said second data storage system for storage in the data storage in said second data storage system, checking whether said automatic recovery mode has been preselected for use in case of link failure, and when said automatic recovery mode has been preselected for use in case of link failure, permitting said host computer to continue to access the remote copy data in the data storage in the first data storage system without intervention, and when said automatic recovery mode has not been preselected for use in case of link failure, not permitting said host computer to access the remote copy data in the data storage in the first data storage system without intervention and instead signaling that intervention is required.
Claim 26
Dependent Claim
37 words
The method as claimed in claim 17, wherein the first data storage system includes means for sending an "intervention required" message to an operating system of said host computer in order to signal that intervention is required.
Claim 27
Dependent Claim
92 words
The method as claimed in claim 17, wherein said automatic recovery mode has not been preselected for use in case of link failure, said failure of the data link occurs preventing data stored in the data storage in said first data storage system from being transmitted to said second data storage system for storage in the data storage in said second data storage system, and the host computer is prevented from accessing the remote copy data in the data storage of the first data storage system for read access and write access.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-03-28 | 2003-09-27 | 2004-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-03-28 | 2007-09-27 | 2008-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-03-28 | 2011-09-27 | 2012-03-28 | $7700.00 | Window Closed / Lapsed |