TREA

Methods and apparatus for providing hypervisor level data services for server virtualization

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Information

  • Patent Grant
  • 11681543
  • Patent Number
    11,681,543
  • Date Filed
    Thursday, June 24, 2021
    2 years ago
  • Date Issued
    Tuesday, June 20, 2023
    11 months ago
  • Inventors
  • Original Assignees
  • Examiners
    • Abad; Farley
    Agents
    • Foley & Lardner LLP
Information
Abstract
A hypervisor virtual server system, including a plurality of virtual servers, a plurality of virtual disks that are read from and written to by the plurality of virtual servers, a physical disk, an I/O backend coupled with the physical disk and in communication with the plurality of virtual disks, which reads from and writes to the physical disk, a tapping driver in communication with the plurality of virtual servers, which intercepts I/O requests made by any one of said plurality of virtual servers to any one of said plurality of virtual disks, and a virtual data services appliance, in communication with the tapping driver, which receives the intercepted I/O write requests from the tapping driver, and that provides data services based thereon.
Description
FIELD OF THE INVENTION

The present invention relates to virtual server environments and data services.


BACKGROUND OF THE INVENTION

Virtual servers are logical entities that run as software in a server virtualization infrastructure, referred to as a “hypervisor”. Examples of hypervisors are VMWARE® ESX manufactured by VMware, Inc. of Palo Alto, Calif., HyperV manufactured by Microsoft Corporation of Redmond, Wash., XENSERVER® manufactured by Citrix Systems, Inc. of Fort Lauderdale, Fla., Redhat KVM manufactured by Redhat, Inc. of Raleigh, N.C., and Oracle VM manufactured by Oracle Corporation of Redwood Shores, Calif. A hypervisor provides storage device emulation, referred to as “virtual disks”, to virtual servers. Hypervisor implements virtual disks using back-end technologies such as files on a dedicated file system, or raw mapping to physical devices.


As distinct from physical servers that run on hardware, virtual servers run their operating systems within an emulation layer that is provided by a hypervisor. Although virtual servers are software, nevertheless they perform the same tasks as physical servers, including running server applications such as database applications, customer relation management applications and MICROSOFT EXCHANGE SERVER®. Most applications that run on physical servers are portable to run on virtual servers. As distinct from virtual desktops that run client side applications and service individual users, virtual servers run applications that service a large number of clients.


As such, virtual servers depend critically on data services for their availability, security, mobility and compliance requirements, the data services including inter alia continuous data protection, disaster recovery, remote replication, data security, mobility, and data retention and archiving policies


SUMMARY OF THE DESCRIPTION

Aspects of the present invention relate to a dedicated virtual data service appliance (VDSA) within a hypervisor that can provide a variety of data services. Data services provided by a VDSA include inter alia replication, monitoring and quality of service.


In an embodiment of the present invention, a tapping filter driver is installed within the hypervisor kernel. The tapping driver has visibility to I/O requests made by virtual servers running on the hypervisor.


A VDSA runs on each physical hypervisor. The VDSA is a dedicated virtual server that provides data services; however, the VDSA does not necessarily reside in the actual I/O data path. When a data service processes I/O asynchronously, the VDSA receives the data outside the data path.


Whenever a virtual server performs I/O to a virtual disk, the tapping driver identifies the I/O requests to the virtual disk. The tapping driver copies the I/O requests, forwards one copy to the hypervisor's backend, and forwards another copy to the VDSA.


Upon receiving an I/O request, the VDSA performs a set of actions to enable various data services. A first action is data analysis, to analyze the data content of the I/O request and to infer information regarding the virtual server's data state. E.g., the VDSA may infer the operating system level and the status of the virtual server. This information is subsequently used for reporting and policy purposes.


A second action, optionally performed by the VDSA, is to store each I/O write request in a dedicated virtual disk for journaling. Since all I/O write requests are journaled on this virtual disk, the virtual disk enables recovery data services for the virtual server, such as restoring the virtual server to an historical image.


A third action, optionally performed by the VDSA, is to send I/O write requests to different VDSAs, residing on hypervisors located at different locations, thus enabling disaster recovery data services.


There is thus provided in accordance with an embodiment of the present invention a hypervisor virtual server system, including a plurality of virtual servers, a plurality of virtual disks that are read from and written to by the plurality of virtual servers, a physical disk, an I/O backend coupled with the physical disk and in communication with the plurality of virtual disks, which reads from and writes to the physical disk, a tapping driver in communication with the plurality of virtual servers, which intercepts I/O requests made by any one of said plurality of virtual servers to any one of said plurality of virtual disks, and a virtual data services appliance, in communication with the tapping driver, which receives the intercepted I/O write requests from the tapping driver, and which provides data services based thereon.


There is additionally provided in accordance with an embodiment of the present invention a method for providing data services within a hypervisor virtual server system, including intercepting I/O requests from any one of a plurality of virtual servers to one of a plurality of virtual disks, and sending intercepted I/O write requests to a virtual data services appliance that provides hypervisor data services.





BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be more fully understood and appreciated from the following detailed description, taken in conjunction with the drawings in which:



FIG. 1 is a simplified block diagram of a hypervisor architecture that includes a tapping driver and a virtual data services appliance, in accordance with an embodiment of the present invention; and



FIG. 2 is a simplified data flow chart for a virtual data services appliance, in accordance with an embodiment of the present invention.





DETAILED DESCRIPTION

Aspects of the present invention relate to a dedicated virtual data services appliance (VDSA) within a hypervisor, which is used to provide a variety of hypervisor data services. Data services provided by a VDSA include inter alia replication, monitoring and quality of service.


Reference is made to FIG. 1, which is a simplified block diagram of a hypervisor architecture that includes a tapping driver and a VDSA, in accordance with an embodiment of the present invention. Shown in FIG. 1 is a hypervisor 100 with three virtual servers 110, three virtual disks 120, an I/O backend 130 and a physical storage array 140. Hypervisor 100 uses a single physical server, but runs multiple virtual servers 110. Virtual disks 120 are a storage emulation layer that provide storage for virtual servers 110. Virtual disks 120 are implemented by hypervisor 100 via I/O backend 130, which connects to physical disk 140.


Hypervisor 100 also includes a tapping driver 150 installed within the hypervisor kernel. As shown in FIG. 1, tapping driver 150 resides in a software layer between virtual servers 110 and virtual disks 120. As such, tapping driver 150 is able to access I/O requests performed by virtual servers 110 on virtual disks 120. Tapping driver 150 has visibility to I/O requests made by virtual servers 110.


Hypervisor 100 also includes a VDSA 160. In accordance with an embodiment of the present invention, a VDSA 160 runs on a separate virtual server within each physical hypervisor. VDSA 160 is a dedicated virtual server that provides data services via one or more data services engines 170. However, VDSA 160 does not reside in the actual I/O data path between I/O backend 130 and physical disk 140. Instead, VDSA 160 resides in a virtual I/O data path.


Whenever a virtual server 110 performs I/O on a virtual disk 120, tapping driver 150 identifies the I/O requests that the virtual server makes. Tapping driver 150 copies the I/O requests, forwards one copy via the conventional path to I/O backend 130, and forwards another copy to VDSA 160. In turn, VDSA 160 enables the one or more data services engines 170 to provide data services based on these I/O requests.


Reference is made to FIG. 2, which is a simplified data flow chart for a VDSA, in accordance with an embodiment of the present invention. Shown in FIG. 2 are an I/O receiver 210, a hash generator 220, a TCP transmitter 230, a data analyzer and reporter 240, a journal manager 250 and a remote VDSA 260. Remote VDSA 260 resides on different physical hardware, at a possibly different location.


As shown in FIG. 2, I/O receiver 210 receives an intercepted I/O request from tapping driver 150. VDSA 160 makes up to three copies of the received I/O requests, in order to perform a set of actions which enable the one or more data services engines 170 to provide various services.


A first copy is stored in persistent storage, and used to provide continuous data protection. Specifically, VDSA 160 sends the first copy to journal manager 250, for storage in a dedicated virtual disk 270. Since all I/O requests are journaled on virtual disk 270, journal manager 250 provides recovery data services for virtual servers 110, such as restoring virtual servers 110 to an historical image. In order to conserve disk space, hash generator 220 derives a one-way hash from the I/O requests. Use of a hash ensures that only a single copy of any I/O request data is stored on disk.


An optional second copy is used for disaster recovery. It is sent via TCP transmitter 230 to remote VDSA 260. As such, access to all data is ensured even when the production hardware is not available, thus enabling disaster recovery data services.


An optional third copy is sent to data analyzer and reporter 240, which generates a report with information about the content of the data. Data analyzer and reporter 240 analyzes data content of the I/O requests and infers information regarding the data state of virtual servers 110. E.g., data analyzer and reporter 240 may infer the operating system level and the status of a virtual server 110.


In the foregoing specification, the invention has been described with reference to specific exemplary embodiments thereof. It will, however, be evident that various modifications and changes may be made to the specific exemplary embodiments without departing from the broader spirit and scope of the invention as set forth in the appended claims. Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense.

Claims
  • 1. A system, comprising: a tapping driver implemented on a hypervisor that is executed on at least one physical server, the tapping driver to: identify an input/output (I/O) request from a virtual server to a virtual disk via an I/O data path;generate a copy of the I/O request to be forwarded to a virtual data services appliance residing outside the I/O data path, the virtual data services appliance to: (i) provide data services based on the copy of the I/O request asynchronously to processing of the I/O request in the I/O data path and (ii) provide the copy of the I/O request to a data analyzer to determine a state of the virtual server;cause the I/O request to be forwarded along the I/O data path to the virtual disk; andcause the copy of the I/O request to be forwarded, concurrent to the forwarding along the I/O data path, to the virtual data services appliance.
  • 2. The system of claim 1, comprising the tapping driver to cause the I/O request to be forwarded to the virtual data services appliance to cause the virtual data services appliance to perform at least one action of a set of actions based on the I/O request to provide the data services via a data services engine.
  • 3. The system of claim 1, comprising the tapping driver to send the I/O request to a journal manager to cause the journal manager to store the I/O request as a journal entry in the virtual disk.
  • 4. The system of claim 1, comprising the tapping driver to generate the copy of the I/O request, concurrent to forwarding of the I/O request from the virtual server to the virtual disk via the I/O data path, to be forwarded to the virtual data services appliance.
  • 5. The system of claim 1, comprising the tapping driver to intercept the I/O request made by the virtual server to the virtual disk from the I/O data path.
  • 6. The system of claim 1, comprising the tapping driver to send the I/O request via a virtual I/O data path to a data services engine, the virtual I/O data path separate from the I/O data path, the virtual I/O data path including the virtual data services appliance.
  • 7. The system of claim 1, comprising the tapping driver residing on a layer between the virtual server and the virtual disk and having visibility to the I/O data path between the virtual server and the virtual disk.
  • 8. A system, comprising: a virtual data services appliance implemented on a hypervisor that is executed on at least one physical server, the virtual data services appliance to: receive a copy of an input/output (I/O) request forwarded outside of an I/O data path by a tapping driver, separately from the tapping driver causing forwarding of the I/O request from a virtual server to a virtual disk along the I/O data path;process the copy of the I/O request asynchronously to provide data services for the hypervisor based on the I/O request; andprovide the copy of the I/O request to a data analyzer to determine a state of the virtual server.
  • 9. The system of claim 8, comprising the virtual data services appliance to generate a plurality of copies of the I/O request with which to perform at least one of a set of actions to provide the data services.
  • 10. The system of claim 8, comprising the virtual data services appliance to provide the copy of the I/O request to a journal manager to journal the I/O request on a dedicated virtual disk.
  • 11. The system of claim 8, comprising the virtual data services appliance to provide the copy of the I/O request to a remote virtual data services to provide recovery data services.
  • 12. The system of claim 8, comprising the virtual data services appliance to provide, based on the copy of the I/O request received from the tapping driver, the data services including at least one of inter alia replication, monitoring, or quality of service.
  • 13. The system of claim 8, comprising the virtual data services appliance residing on a virtual I/O data path separate from the I/O data path between the virtual server and the virtual disk.
  • 14. A method, comprising: receiving, by a virtual data services appliance implemented on a hypervisor, a copy of an input/output (I/O) request forwarded outside of an I/O data path by a tapping driver, separately from the tapping driver causing forwarding of the I/O request from a virtual server to a virtual disk along the I/O data path;processing, by the virtual data services appliance, the copy of the I/O request asynchronously to provide data services for the hypervisor based on the I/O request; andproviding, by the virtual data services appliance, the copy of the I/O request to a data analyzer to determine a state of the virtual server.
  • 15. The method of claim 14, comprising: generating, by the virtual data services appliance, a plurality of copies of the I/O request with which to perform at least one of a set of actions to provide the data services.
  • 16. The method of claim 14, comprising: providing, by the virtual data services appliance, the copy of the I/O request to a journal manager to journal the I/O request on a dedicated virtual disk.
  • 17. The method of claim 14, comprising: providing, by the virtual data services appliance, the copy of the I/O request to a remote virtual data services to provide recovery data services.
  • 18. The method of claim 14, comprising: providing, by the virtual data services appliance, based on the copy of the I/O request received from the tapping driver, the data services including at least one of inter alia replication, monitoring, or quality of service.
CROSS REFERENCES TO RELATED APPLICATIONS

This application is a continuation of, and claims priority under 35 U.S.C. § 120 and benefit of U.S. patent application Ser. No. 16/654,557, titled METHODS AND APPARATUS FOR PROVIDING HYPERVISOR LEVEL DATA SERVICES FOR SERVER VIRTUALIZATION, filed Oct. 16, 2019 by inventor Ziv Kedem, which is a continuation of, and claims priority under 35 U.S.C. § 120 and benefit of U.S. patent application Ser. No. 15/240,847, titled METHODS AND APPARATUS FOR PROVIDING HYPERVISOR LEVEL DATA SERVICES FOR SERVER VIRTUALIZATION, filed Aug. 18, 2016 by inventor Ziv Kedem, which is a continuation of, and claims priority under 35 U.S.C. § 120 and benefit of U.S. patent application Ser. No. 13/039,446, titled METHODS AND APPARATUS FOR PROVIDING HYPERVISOR LEVEL DATA SERVICES FOR SERVER VIRTUALIZATION, filed Mar. 3, 2011 by inventor Ziv Kedem, which claims priority under 35 U.S.C. § 119 and benefit of U.S. Provisional Application No. 61/314,589, titled METHODS AND APPARATUS FOR PROVIDING HYPERVISOR LEVEL DATA SERVICES FOR SERVER VIRTUALIZATION, filed on Mar. 17, 2010 by inventor Ziv Kedem, each of which is incorporated by reference in its entirety.

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Kedem Exhibit List, Patent Interference No. 106,070, dated Oct. 20, 2017.
Kedem List of Proposed Motions, Patent Interference No. 106,070, dated Mar. 8, 2017.
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Kedem Notice of Change of Lead and Backup Counsel, Patent Interference No. 106,070 (Sep. 12, 2017).
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Kedem Notice of Lead and Backup Counsel, Patent Interference No. 106,070, Jan. 31, 2017.
Kedem Notice of Real Party in Interest, Patent Interference No. 106,070, Jan. 31, 2017.
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Kedem Opposition to Natanzon Motion to Exclude Evidence, dated Feb. 1, 2018.
Kedem Priority Statement, Patent Interference No. 106,070, Filed Jul. 7, 2017.
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Kedem Request for File Copies, Patent Interference No. 106,070, Jan. 31, 2017.
Kedem Request for Oral Argument, dated Jan. 17, 2018.
Kedem Updated Exhibit List, dated Jan. 17, 2018.
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Natanzon Exhibit 2064, Inventions Assignment, Nondisclosure and Noncompetition Agreement between Kashya Ltd. and Shlomo Ahal, dated May 8, 2006.
Natanzon Exhibit 2065, EMC International Key Employee Agreement of Tzach Shechner, dated May 22, 2006.
Natanzon Exhibit 2067, Statement of Facts Submitted with Petition for Application on Behalf of Nonsigning Inventors, dated Aug. 10, 2012.
Natanzon Exhibit 2068, Exhibit A Declaration, Power of Attorney and Assignment signed by Assaf Natanzon on Oct. 6, 2012, and Christos Karamanolis on Jul. 10, 2012.
Natanzon Exhibit 2069, Renewed Petition, dated Sep. 5, 2012.
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Natanzon Exhibit 2075, Declaration of Nathan R. Speed in Support of Motion for Admission Pro Hac Vice, Patent Interference No. 106,070, Sep. 11, 2017.
Natanzon Exhibit 2076, Transcript of Deposition of Matan Gilat, Sep. 14, 2017.
Natanzon Exhibit 2077, Transcript of Deposition of Allan Lipka, Sep. 28, 2017.
Natanzon Exhibit 2078, Transcript of Deposition of Allan Lipka, Sep. 29, 2017.
Natanzon Exhibit 2079, Transcript of Deposition of Christos Karamanolis, Sep. 25, 2017.
Natanzon Exhibit 2080, Transcript of Deposition of Christos Karamanolis, Sep. 26, 2017.
Natanzon Exhibit 2081, Transcript of Deposition of Matthew Amdur, Sep. 26, 2017.
Natanzon Exhibit 2082, Kedem Opposition 1 to Natanzon Motion for Judgment under 35 U.S.C. sec. 102(f), dated Oct. 20, 2017.
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Natanzon Exhibit 2098, US Office Action for U.S. Appl. No. 13/039,446 dated Jan. 2, 2015.
Natanzon Exhibit 2099, Natanzon Objections to the Admissibility of Kedem's Evidence (for exhibits and materials submitted with Kedem Oppositions 1 and 2), dated Oct. 27, 2017.
Natanzon Exhibit List, Patent Interference No. 106,070, dated Jul. 7, 2017.
Natanzon Kedem Opposition 5 (to Natanzon Motion 5, Request for Rehearing) Patent Interference No. 106,070, Mar. 8, 2019.
Natanzon List of Proposed Motions, Patent Interference No. 106,070, dated Mar. 8, 2017.
Natanzon Miscellaneous Motion 5 (Request for Hearing of Decision and Judgement) Patent Interference No. 106,070, Jan. 22, 2019.
Natanzon Motion 1, Patent Interference No. 106, 070, dated Jul. 7, 2017.
Natanzon Motion 2 (to correct inventorship), Patent Interference No. 106,070, dated Jul. 7, 2017.
Natanzon Motion to Exclude, dated Jan. 17, 2018.
Natanzon Notice of Change in Lead and Backup Counsel, Patent Interference No. 106,070, Jun. 6, 2017.
Natanzon Notice of Deposition of Oded Kedem, dated Dec. 1, 2017.
Natanzon Notice of Deposition of Professor Matthew Green, dated Dec. 1, 2017.
Natanzon Notice of Deposition of Ziv Kedem, dated Dec. 1, 2017.
Natanzon Notice of Filing Deposition Transcripts, Patent Interference No. 106,070, dated Oct. 19, 2017.
Natanzon Notice of Lead and Backup Counsel, Patent Interference No. 106,070, Feb. 1, 2017.
Natanzon Notice of Real Party in Interest, Patent Interference No. 106,070, Feb. 1, 2017.
Natanzon Notice of Related Proceedings, Patent Interference No. 106,070, dated Feb. 1, 2017.
Natanzon Notice of Service of Supplemental Evidence, Patent Interference No. 106,070, dated Jul. 28, 2017.
Natanzon Notice of Serving Priority Statement, Patent Interference No. 106,070, Jul. 10, 2017.
Natanzon Objections to the Admissibility of Kedem's Evidence, for exhibits and materials submitted with Kedem Oppositions 1 and 2, dated Oct. 27, 2017.
Natanzon Opposition to Kedem Miscellaneous Motion 1 (to exclude Natanzon's Evidence), dated Feb. 1, 2018.
Natanzon Order-Authorizing Opposition and Reply—Bd. R. 125(c)(4), Patent Interference No. 106,070, Feb. 6, 2019.
Natanzon Priority Statement, Patent Interference No. 106, 070, dated Jul. 7, 2017.
Natanzon Reply 1, dated Jan. 9, 2018.
Natanzon Reply 2, dated Jan. 9, 2018.
Natanzon Reply 5 (to Opposition to Request for Hearing of Decision and Judgement), Patent Interference No. 106,070, Mar. 22, 2019.
Natanzon Request for File Copies, Patent Interference No. 106,070, dated Feb. 1, 2017.
Natanzon Request for Oral Argument, dated Jan. 17, 2018.
Natanzon Unopposed Miscellaneous Motion 1 (Request for pro hac vice admission of Nathan R. Speed), Patent Interference No. 106,070 (Sep. 12, 2017).
Natanzon Updated Exhibit List, Patent Interference No. 106,070, dated Jul. 11, 2017.
Natanzon Updated Exhibit List, Patent Interference No. 106,070, dated Oct. 19, 2017.
Natanzon Updated Exhibit List, Patent Interference No. 106,070, Jul. 28, 2017.
Natanzon Updated Exhibit List, Patent Interference No. 106,070, Sep. 12, 2017.
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Related Publications (1)
Number Date Country
20210326166 A1 Oct 2021 US
Provisional Applications (1)
Number Date Country
61314589 Mar 2010 US
Continuations (3)
Number Date Country
Parent 16654557 Oct 2019 US
Child 17356809 US
Parent 15240847 Aug 2016 US
Child 16654557 US
Parent 13039446 Mar 2011 US
Child 15240847 US