Restoration detecting method, restoration detecting apparatus, and restoration detecting program

• US 9,983,949 B2
• Filed: 06/08/2015
• Issued: 05/29/2018
• Est. Priority Date: 06/12/2014
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Maekawa, Takahiro
• Primary Examiner(s): Bonzo, Bryce
• Assistant Examiner(s): Lin, Katherine
• Application Number:
  US14/733,545
• Publication Number:
  US 20150363279A1
• Time in Patent Office: 1,086 Days
• CPC Class Codes: G06F 11/1451 by selection of backup contents
• CPC Class Codes: G06F 11/1469 Backup restoration techniques
• CPC Class Codes: G06F 11/3003 Monitoring arrangements specially adapted to the computing system or computing system component being monitored
• CPC Class Codes: G06F 11/302 where the computing system component is a software system
• CPC Class Codes: G06F 11/3055 Monitoring arrangements for monitoring the status of the computing system or of the computing system component, e.g. monitoring if the computing system is on, off, available, not available error or fault processing without redundancy G06F11/0703; error detection or correction by redundancy in data representation G06F11/08; error detection or correction by redundancy in operation G06F11/14; error detection or correction by redundancy in hardware G06F11/16
• CPC Class Codes: G06F 11/3093 Configuration details thereof, e.g. installation, enabling, spatial arrangement of the probes
• CPC Class Codes: G06F 11/3096 wherein the means or processing minimize the use of computing system or of computing system component resources, e.g. non-intrusive monitoring which minimizes the probe effect: sniffing, intercepting, indirectly deriving the monitored data from other directly available data
• CPC Class Codes: G06F 11/3476 Data logging G06F11/14, G06F11/2205 take precedence
• CPC Class Codes: G06F 2009/45591 Monitoring or debugging support
• CPC Class Codes: G06F 2201/815 Virtual
• CPC Class Codes: G06F 2201/835 Timestamp
• CPC Class Codes: G06F 2201/84 Using snapshots, i.e. a logical point-in-time copy of the data
• CPC Class Codes: G06F 2201/865 Monitoring of software
• CPC Class Codes: G06F 9/45533 Hypervisors; Virtual machine monitors
• CPC Class Codes: G06F 9/45558 Hypervisor-specific management and integration aspects

Abstract

A restoration detecting method includes receiving, by a processor, from a monitoring target virtual machine, file size information indicating a file size of a specific file, the file size of which cumulatively increases as the virtual machine runs, and detecting, by a processor, restoration of the virtual machine on a basis of the received file size information.

Claims

1. A restoration detecting method comprising:

receiving, by a processor, from a monitoring target virtual machine, first file size information indicating a file size of a specific file, the file size of which cumulatively increases as the monitoring target virtual machine runs, at first time and second file size information indicating a file size of the specific file at second time later than the first time; and

when the file size indicated by the second file size information is smaller than the file size indicated by the first file size information, detecting, by a processor, restoration of the virtual machine between the first time and the second time.

2. The restoration detecting method according to claim 1, wherein

the specific file is a file, the file size of which increases at a fixed rate according to elapse of time,

the file size information includes third file size information indicating a file size of the specific file at third time later than the second time is received, and

the detecting the restoration of the virtual machine includes:

when a second increase ratio of the file size between the second time and the third time based on the second and third file size information is smaller than a first increase ratio of the file size between the first time and the second time based on the first and second file size information, determining, by a processor, that the restoration has occurred.

3. The restoration detecting method according to claim 1, wherein

the second time is time after the first time and before the file size of the specific file increases, and

the detecting the restoration of the virtual machine includes:

when the first file size information and the second file size information do not coincide with each other, determining, by a processor, that the restoration has occurred.

4. The restoration detecting method according to claim 1, wherein

the specific file is a file that stores a time stamp at every predetermined time, and

the detecting the restoration of the virtual machine includes:

when the restoration has occurred, calculating, by a processor, time differences between times indicated by first time stamps stored in the specific file and times indicated by second time stamps stored in the specific file just after the first time stamps and,

when a time difference larger than the predetermined time is present among the time differences, determining, by a processor, that time at a restoration destination of the virtual machine is included between the time indicated by the first time stamp and time when the predetermined time elapses.

5. The restoration detecting method according to claim 1, wherein the specific file is a log file that accumulates logs output in the virtual machine.

6. The restoration detecting method according to claim 1, wherein

the specific file is a file in which the number of files configuring the specific file increase under a predetermined condition, and

the file size information includes the number of files.

7. The restoration detecting method according to claim 1, wherein the detecting the restoration of the virtual machine is performed on the basis of third file size information indicating a file size of the specific file at third time and fourth file size information indicating a file size at fourth time different from the third time.

8. A restoration detecting apparatus comprising:

a receiving circuitry configured to receive, from the monitoring target virtual machine, first file size information indicating a file size of a specific file, the file size of which cumulatively increases as the monitoring target virtual machine runs, at first time and second file size information indicating a file size of the specific file at second time later than the first time; and

when the file size indicated by the second file size information is smaller than the file size indicated by the first file size information, a detecting circuitry configured to detect restoration of the virtual machine between the first time and the second time.

9. A non-transitory computer-readable storage medium storing a restoration detecting program that causes a computer to execute a process comprising:

receiving, from a monitoring target virtual machine, first file size information indicating a file size of a specific file, the file size of which cumulatively increases as the monitoring target virtual machine runs, at first time and second file size information indicating a file size of the specific file at second time later than the first time; and

when the file size indicated by the second file size information is smaller than the file size indicated by the first file size information, detecting restoration of the virtual machine between the first time and the second time.