WO2017107900A1 - 一种虚拟机恢复的方法及虚拟机管理设备 - Google Patents

一种虚拟机恢复的方法及虚拟机管理设备 Download PDF

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Publication number
WO2017107900A1
WO2017107900A1 PCT/CN2016/111080 CN2016111080W WO2017107900A1 WO 2017107900 A1 WO2017107900 A1 WO 2017107900A1 CN 2016111080 W CN2016111080 W CN 2016111080W WO 2017107900 A1 WO2017107900 A1 WO 2017107900A1
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Prior art keywords
virtual machine
data
cloud server
management device
recovery
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PCT/CN2016/111080
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English (en)
French (fr)
Inventor
邬肖元
黄恒
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2017107900A1 publication Critical patent/WO2017107900A1/zh
Priority to US16/002,715 priority Critical patent/US10817386B2/en
Priority to US17/033,103 priority patent/US11397648B2/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/14—Error detection or correction of the data by redundancy in operation
    • G06F11/1402—Saving, restoring, recovering or retrying
    • G06F11/1446—Point-in-time backing up or restoration of persistent data
    • G06F11/1458—Management of the backup or restore process
    • G06F11/1469—Backup restoration techniques
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/14—Error detection or correction of the data by redundancy in operation
    • G06F11/1479—Generic software techniques for error detection or fault masking
    • G06F11/1482—Generic software techniques for error detection or fault masking by means of middleware or OS functionality
    • G06F11/1484—Generic software techniques for error detection or fault masking by means of middleware or OS functionality involving virtual machines
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2201/00—Indexing scheme relating to error detection, to error correction, and to monitoring
    • G06F2201/815—Virtual
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2201/00—Indexing scheme relating to error detection, to error correction, and to monitoring
    • G06F2201/82—Solving problems relating to consistency

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a virtual machine recovery method and a virtual machine management device.
  • the data of the virtual machine is often backed up or copied to the backup storage space of the remote location, for example, the local data of the virtual machine is backed up or copied to the cloud server.
  • the virtual machine data can be downloaded from the backup storage space such as the cloud server to recover the virtual machine.
  • the existing virtual machine recovery technology is limited by the network bandwidth and the data backup format. If the data backup of the virtual machine is on the cloud server, all the backup data needs to be downloaded to the virtual machine first, and then the virtual machine is started. Due to the large amount of data of the virtual machine, it takes a few hours to several days to restore all the backup data of the virtual machine to the virtual machine, which takes a long time and the virtual machine recovery efficiency is low.
  • the present application provides a virtual machine recovery method and a virtual machine management device, which can improve the efficiency of virtual machine recovery.
  • the first aspect provides a method for virtual machine recovery, which is applied to a virtual machine management device, where the virtual machine management device backs up data in the restored virtual machine to the cloud server, which may include:
  • Receiving an IO request determining whether data related to the IO request is stored in the local storage unit, and if not, downloading data related to the IO request from the cloud server to the local storage unit, and Returns the data requested by the IO request.
  • the present application can obtain the configuration information of the restored virtual machine from the cloud server when receiving the virtual machine recovery command, and create the recovery virtual machine and its local storage unit according to the configuration information of the restored virtual machine.
  • the basic system data is downloaded from the cloud server, and the recovery virtual machine is started according to the basic system data, thereby improving the startup efficiency of the virtual machine.
  • the corresponding data can be downloaded from the cloud server to respond to the IO request when the IO request is received, which ensures the realization of more functions of the recovery virtual machine and improves the recovery efficiency of the virtual machine.
  • the method further includes:
  • the obtaining and downloading basic system data from the cloud server includes:
  • bitmap information of the basic system data from the cloud server, acquiring the basic system data in an operating system of the restored virtual machine backed up in the cloud server according to the bitmap information, and downloading The basic system data.
  • the bitmap information of the basic system data required for the normal operation of the restored virtual machine is recorded and stored in the cloud server, so that the virtual system can be restored according to the bit of the basic system data.
  • the figure information downloads the basic system data from the cloud server, is used to resume the startup of the virtual machine, improves the downloading efficiency of the basic system data of the restored virtual machine, and further improves the startup efficiency of the virtual machine.
  • the recovered virtual machine The data in the data is divided into data blocks of a preset size and stored in the divided data blocks when being backed up to the cloud server.
  • the data of the restored virtual machine is backed up and stored in the manner of data block storage to the cloud server, which improves the convenience of searching and downloading data when downloading the data of the restored virtual machine from the cloud server, and enhances the remote backup data.
  • the method further includes:
  • the data block is downloaded from the cloud server according to the counted number of times each of the data blocks is backed up, wherein the more the backup times, the higher the priority of the data block downloading. .
  • the present application can download other data blocks except the basic system data in the data of the restored virtual machine from the cloud server in response to the idle fragmentation time of the access operation of the virtual machine, and can fully utilize the time after the virtual machine is started to download data, shortening The time when the virtual machine is started increases the efficiency of virtual machine recovery.
  • the configuration information of the recovered virtual machine may include: a central processing unit CPU, a memory At least one of size, number of disks, and size of each of the disks.
  • the application can create a recovery virtual machine having the same configuration information as the restored virtual machine according to the configuration information of the restored virtual machine, and restore the local storage unit corresponding to the virtual machine, thereby improving the recovery accuracy of the restored virtual machine.
  • the second aspect provides a virtual machine management device, where the virtual machine management device backs up data in the restored virtual machine to the cloud server, which may include:
  • a receiving module configured to receive a virtual machine recovery command
  • a creating module configured to acquire configuration information of the restored virtual machine from the cloud server when the receiving module receives the virtual machine recovery command, according to the configuration information Establishing a recovery virtual machine and a local storage unit corresponding to the recovery virtual machine;
  • the receiving module is further configured to receive a virtual machine startup command
  • a downloading module configured to acquire and download basic system data from the cloud server when the receiving module receives the startup command
  • a startup module configured to start the recovery virtual machine according to the basic system data downloaded by the downloading module, where the basic system data is data in an operating system that enables the recovery virtual machine to operate normally;
  • the receiving module is further configured to receive an IO request
  • the downloading module is further configured to determine whether data related to the IO request received by the receiving module is stored in the local storage unit, and if not, downloading, related to the IO request from the cloud server Data to the local storage unit and return the data requested by the IO request.
  • the virtual machine management device further includes:
  • a backup module configured to record, when the restored virtual machine is started, bitmap information of the basic system data required to start from the restored virtual machine to the normal operation of the restored virtual machine, where the bitmap information includes a starting position and a length of the sub-data in the basic system data, and storing the bitmap information in the cloud server;
  • the download module is specifically configured to:
  • bitmap information of the basic system data from the cloud server, acquiring the basic system data in an operating system of the restored virtual machine backed up in the cloud server according to the bitmap information, and downloading The basic system data.
  • the backup module is further configured to:
  • the backup module is further configured to:
  • the downloading module is further configured to download, according to the number of times that each of the data blocks is backed up, the data block is downloaded from the cloud server according to the idle time of the virtual machine management device, where the backup is performed. The higher the number of data blocks downloaded, the higher the priority.
  • the configuration information of the restored virtual machine may include: a central processing unit CPU, a memory At least one of size, number of disks, and size of each of the disks.
  • a third aspect provides a virtual machine management device, which can include: a processor, a memory, a bus, and a communication interface;
  • the memory is configured to store a computer execution instruction, and the processor is connected to the memory through the bus;
  • the processor executes the computer execution instructions stored in the memory to cause the virtual machine management device to perform the method of virtual machine recovery described above when the virtual machine management device is running.
  • FIG. 1 is a schematic structural diagram of a virtual machine management device according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of a method for recovering a virtual machine according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of statistics of the number of incremental backups of data blocks according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a virtual machine management device according to another embodiment of the present invention.
  • remote backup data cannot be directly used for virtual machine recovery.
  • virtual machine recovery technology cannot support remote backup data.
  • One is: when the virtual machine is restored, the data access needs to reach 30MB/s ( The bandwidth requirement of 240 Mbps), and the access bandwidth of the existing remote data often cannot meet this requirement, so that the remote backup data cannot be directly used for the recovery of the virtual machine.
  • the second is that remote backup data is often saved and read in a sequential manner, which cannot meet the random access needs of the backup data during virtual machine recovery.
  • S3 protocol requires data to be uploaded in an object-based format, and the data is sequentially uploaded and saved. Backup data cannot be used directly for virtual machine recovery.
  • the embodiment of the present invention solves two technical problems that the remote backup data cannot be directly used for virtual machine recovery by combining the backup data pre-reading and the block storage of the backup data.
  • the method and device for recovering a virtual machine according to an embodiment of the present invention will be described below with reference to FIG. 1 to FIG.
  • FIG. 1 is a schematic structural diagram of an embodiment of a virtual machine management device according to an embodiment of the present invention.
  • the virtual machine management device described in the embodiment of the present invention includes: a processor 1001, a memory 1002, a system bus 1004, and a communication interface 1005.
  • the processor 1001, the memory 1002, and the communication interface 1005 are connected by the system bus 1004 and complete communication with each other.
  • Processor 1001 may be a single core or multi-core central processing unit, or a particular integrated circuit, or one or more integrated circuits configured to implement embodiments of the present invention.
  • the memory 1002 may be a high speed RAM memory or a non-volatile memory such as at least one disk memory.
  • the memory 1002 is for storing computer execution instructions.
  • the processor 1001 runs the computer to execute the instruction 1, and the method shown in FIG. 2 can be performed.
  • FIG. 2 is a schematic flowchart diagram of a method for recovering a virtual machine according to an embodiment of the present invention.
  • the method for recovering a virtual machine in the embodiment of the present invention is applied to a virtual machine management device, wherein the virtual machine management device backs up data in the restored virtual machine to the cloud server.
  • the method for recovering a virtual machine described in the embodiment of the present invention includes the following steps:
  • S101 Receive a virtual machine recovery command, obtain configuration information of the restored virtual machine from the cloud server, and create a recovery virtual machine and a local storage unit corresponding to the recovery virtual machine according to the configuration information.
  • the user when the user performs the virtual machine recovery operation, the user may first send a virtualization recovery command to the virtual machine management device by using a user operation indication on the virtual machine management device, and trigger the virtual machine management device to restore the restored virtual machine.
  • the virtual machine to be recovered is a virtual machine that needs data recovery because of a data failure or loss due to a disaster or the like.
  • the configuration information of the restored virtual machine may be obtained from the cloud server, and the local storage unit corresponding to the recovery virtual machine and the recovery virtual machine may be created according to the configuration information of the restored virtual machine.
  • the recovery virtual machine is a virtual machine newly created by the virtual machine management device, and is used to replace the restored virtual machine, so that the data of the restored virtual machine can be restored to the recovery virtual machine.
  • the configuration information of the restored virtual machine may include: a central processing unit (CPU) of the virtual machine, a memory size, a number of disks, and a size of each disk. No restrictions.
  • the recovery virtual machine having the same configuration information as the restored virtual machine may be created according to the configuration information, and the virtual machine corresponding to the restored virtual machine may be restored.
  • the local storage unit corresponding to the recovery virtual machine may specifically be a local disk of the recovery virtual machine.
  • the storage space corresponding to the cloud server may be an S3 cloud storage space, which is not limited herein.
  • the virtual machine management device creates a recovery virtual machine and its corresponding local
  • the notification information of the completion of the creation may be output to the user operation interface of the virtual machine management device for the user to consult.
  • the virtual machine management device may be sent to the virtual machine management device to trigger the virtual machine management device to recover the virtual machine by using a related operation instruction on the virtual machine management device. start up.
  • the virtual machine management device may acquire and download the basic system data of the restored virtual machine from the cloud server, and then start the recovery virtual machine according to the basic system data.
  • the basic system data is data in the operating system that enables the recovery virtual machine to operate normally.
  • the restored virtual machine backup operating system stored in the cloud server includes two parts of data, one part is the basic system data of the operating system, that is, data for making the virtual machine run normally, such as a driver, etc.;
  • An application that comes with or is provided by the operating system wherein the application that comes with the operating system may include a drawing, an calculator, a tablet, and the like in the accessory. Further, the application attached to the operating system may be set by the user. The application in the quick launch bar, etc.
  • the virtual machine management device performs the process of backing up the data in the virtual machine to the cloud server, and the virtual machine is in a normal working state, that is, before the virtual machine is restored
  • the virtual machine management device may record bitmap information of basic system data required to start from the resumed virtual machine to the normal operation of the restored virtual machine during the normal startup of the restored virtual machine, and record the bitmap information.
  • the bitmap information of the basic system data includes: a starting position and a length of the sub data in the basic system data.
  • the bitmap information of the basic system data may be obtained from the cloud server, and then may be based on the starting position and length of the sub-data of the basic system data in the bitmap information.
  • the basic system data is searched for in the operating system of the restored virtual machine backed up in the cloud server, and the basic system data is downloaded to the recovery virtual machine to start the recovery virtual machine according to the basic system data.
  • the data in the restored virtual machine may be divided into data blocks of a preset size, and then the data may be backed up to the cloud server. At the time, the data block obtained by the division is stored.
  • the virtual machine management device saves the data of the restored virtual machine in blocks, and downloads the data in the manner of the data block when the virtual machine is restored, so that the virtual machine management device can first acquire and download the basic system data from the cloud server, and Starting the recovery virtual machine based on the basic system data improves the efficiency of virtual machine recovery.
  • S103 Receive an IO request, determine whether data related to the IO request is stored in the local storage unit, and if not, download data related to the IO request from the cloud server to the local storage unit. And return the data requested by the IO request.
  • the user can perform data read and write operations on the restored virtual machine.
  • the user can perform an operation by using a user operation instruction on the virtual machine management device to send an input/output (English: Input/Output, IO) request to the virtual machine management device.
  • the IO request may include a read operation corresponding to the data and a request instruction corresponding to the write operation, and is not limited herein.
  • the virtual machine management device may first determine whether data related to the IO request is stored in the local storage unit. For example, after the virtual machine management device receives the request instruction of the read operation, it may first determine whether the data requested by the request instruction of the read operation is stored in the local storage unit.
  • the data requested by the IO request may be directly returned. If the data requested by the IO request does not exist in the local storage unit, the virtual machine management device may download the data requested by the IO request from the cloud server to the local storage unit, and return the data requested by the IO request.
  • the data in the restored virtual machine may also be backed up by using an incremental backup.
  • the incremental backup refers to backing up data that has been modified during the time interval from the previous backup to the current backup, and the unmodified data is not used as a backup backup mode. That is, only the changed data is backed up, and the unchanged data is not backed up. Thus, whether a certain data block is active data can be determined by the number of occurrences in the incremental backup.
  • the virtual machine management device performs incremental backup on the data in the restored virtual machine, the number of times each data block is backed up may be counted, and then each data of the virtual machine management device may be idle according to the statistics.
  • FIG. 3 is a statistical diagram of the number of incremental backups of data blocks.
  • backup English: backup
  • B0, B1, B2, ..., and B15 represent data block 0, data block 1, data block 2, ..., and data block 15, frequency (English: Frequency) indicates the number of incremental backups of each data block, wherein the more the number of incremental backups, the higher the probability of using the data block.
  • the number of incremental backups of B13 is four, and the number of incremental backups of B13 is greater than the number of incremental backups of other data blocks. This shows that B13 has the highest probability of use.
  • the number of incremental backups of B2 is 3 times.
  • the number of incremental backups of B2 is less than the number of incremental backups of B13, which is greater than the number of incremental backups of other data blocks. It can be seen that the probability of using B2 is lower than that of B13.
  • the probability of use is higher than the probability of use of other data blocks.
  • the virtual machine management device may determine, according to the order of the number of times each data block is backed up, the priority of each data block to be downloaded from high to low, and then download the respective high to low according to the priority. Data blocks, which use higher-priority block-first downloads to ensure that the recovery virtual machine recovers the recovered virtual machine more quickly.
  • the virtual machine management device can back up and store the data of the restored virtual machine according to the data block storage manner to the cloud server, and further can be based on the location and length of the basic system data required for the virtual machine to be started.
  • the map information downloads the basic system data of the virtual machine from the cloud server, and starts the recovery virtual machine according to the basic system data. After starting the recovery virtual machine, the IO request can be responded to the access operation of the virtual machine. If the access operation needs to download data from the S3 cloud storage space, the corresponding data is downloaded from the S3 cloud storage space and written into the local storage unit in response to the virtual Machine access operation.
  • the virtual machine management device may download other data blocks other than the basic system data in the data of the restored virtual machine from the cloud server in response to the idle fragmentation time of the access operation of the virtual machine, and fully utilize the virtual machine after startup. Time to download data, shorten the startup time of the virtual machine, and improve the efficiency of virtual machine recovery.
  • FIG. 4 is a schematic structural diagram of a virtual machine management device according to another embodiment of the present invention.
  • the virtual machine management device described in the embodiment of the present invention includes:
  • the receiving module 10 is configured to receive a virtual machine recovery command.
  • a creating module 20 configured to: when the receiving module receives the virtual machine recovery command, acquire configuration information of the restored virtual machine from the cloud server, and create a recovery virtual machine and the recovery virtual machine according to the configuration information. Corresponding local storage unit.
  • the receiving module 10 is further configured to receive a virtual machine startup command.
  • the downloading module 30 is configured to acquire and download basic system data from the cloud server when the receiving module receives the startup command.
  • the startup module 40 is configured to start the recovery virtual machine according to the basic system data downloaded by the download module, where the basic system data is data in the operating system that enables the recovery virtual machine to operate normally.
  • the receiving module 10 is further configured to receive an IO request.
  • the downloading module 30 is further configured to determine whether data related to the IO request received by the receiving module is stored in the local storage unit, and if not, download and the IO request from the cloud server. Correlated data is sent to the local storage unit and the data requested by the IO request is returned.
  • the virtual machine management device described in the embodiment of the present invention further includes:
  • the backup module 50 is configured to record, when the restored virtual machine is started, bitmap information of the basic system data required to start from the restored virtual machine to the normal operation of the restored virtual machine, the bitmap information Include a starting position and a length of the sub-data in the basic system data, and store the bitmap information in the cloud server;
  • the download module 30 is specifically configured to:
  • bitmap information of the basic system data from the cloud server, acquiring the basic system data in an operating system of the restored virtual machine backed up in the cloud server according to the bitmap information, and downloading The basic system data.
  • the backup module 50 is further configured to:
  • the backup module 50 is further configured to: when incrementally backing up data in the recovered virtual machine, count the number of times each of the data blocks is backed up;
  • the downloading module 30 is further configured to use, according to the idle time of the virtual machine management device, the number of times each of the data blocks is backed up according to the backup module from the cloud service
  • the server side downloads the data block, wherein the more the number of backups, the higher the priority of the data block download.
  • the virtual machine management device may be used to perform the implementation manner described in the embodiment of the method for restoring the virtual machine provided by the embodiment of the present invention.
  • the virtual machine management device may be used to perform the implementation manner described in the embodiment of the method for restoring the virtual machine provided by the embodiment of the present invention.
  • the virtual machine management device can back up and store the data of the restored virtual machine according to the data block storage manner to the cloud server, and further can be based on the location and length of the basic system data required for the virtual machine to be started.
  • the map information downloads the basic system data of the virtual machine from the cloud server, and starts the recovery virtual machine according to the basic system data. After starting the recovery virtual machine, the IO request can be responded to the access operation of the virtual machine. If the access operation needs to download data from the S3 cloud storage space, the corresponding data is downloaded from the S3 cloud storage space and written into the local storage unit in response to the virtual Machine access operation.
  • the virtual machine management device may download other data blocks other than the basic system data in the data of the restored virtual machine from the cloud server in response to the idle fragmentation time of the access operation of the virtual machine, and fully utilize the virtual machine after startup. Time download data to shorten the startup time of the virtual machine.
  • the download order of the related data can be determined according to the number of backups of the data block, and the data block with higher probability is preferentially downloaded to ensure the normal use of the restored virtual machine, and the normal use is improved. The efficiency of virtual machine recovery.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

一种虚拟机恢复的方法，应用于虚拟机管理设备，包括：接收虚拟机恢复命令，从云服务器获取被恢复虚拟机的配置信息，根据所述配置信息创建恢复虚拟机及恢复虚拟机对应的本地存储单元(S101)；接收虚拟机启动命令，从云服务器获取并下载基本系统数据，并根据所述基本系统数据启动恢复虚拟机(S102)；接收IO请求，确定与所述IO请求相关的数据是否存储在本地存储单元中，若不存在，则从云服务器下载与所述IO请求相关的数据至本地存储单元，并返回所述IO请求所请求的数据(S103)。还公开了一种虚拟机管理设备。采用本方法，具有可提高虚拟机恢复的效率的优点。

Description

一种虚拟机恢复的方法及虚拟机管理设备 技术领域
本发明涉及通信技术领域，尤其涉及一种虚拟机恢复的方法及虚拟机管理设备。
背景技术
随着企业服务器越来越往虚拟化平台转移，物理的服务器变成了虚拟机，现代备份软件也增强了对虚拟机的保护能力。为了防止火灾、水灾、地震等灾难导致虚拟机的数据的损坏或者丢失，虚拟机的数据往往会被备份或者复制到异地的备份存储空间，例如，将虚拟机的本地数据备份或复制到云服务器。灾难发生时，可从云服务器等备份存储空间中下载虚拟机的数据进而恢复虚拟机。
现有的虚拟机恢复技术，由于受网络带宽和数据备份格式的限制，如果虚拟机的数据备份在云服务器，需要先将备份数据全部下载到虚拟机，然后再启动虚拟机。由于虚拟机的数据量较大，将虚拟机的备份数据全部恢复到虚拟机需要耗时几个小时到几天不等，耗时长，虚拟机恢复效率低。
发明内容
本申请提供一种虚拟机恢复的方法及虚拟机管理设备，可提高虚拟机恢复的效率。
第一方面提供了一种虚拟机恢复的方法，应用于虚拟机管理设备，所述虚拟机管理设备将被恢复虚拟机中的数据备份至云服务器，其可包括：
接收虚拟机恢复命令，从所述云服务器获取被恢复虚拟机的配置信息，根据所述配置信息创建恢复虚拟机及所述恢复虚拟机对应的本 地存储单元；
接收虚拟机启动命令，从所述云服务器获取并下载基本系统数据，并根据所述基本系统数据启动所述恢复虚拟机，所述基本系统数据为操作系统中使所述恢复虚拟机能够正常运行的数据；
接收IO请求，确定与所述IO请求相关的数据是否存储在所述本地存储单元中，若不存在，则从所述云服务器下载与所述IO请求相关的数据至所述本地存储单元，并返回所述IO请求所请求的数据。
本申请可在接收到虚拟机恢复命令时，从云服务器中获取被恢复虚拟机的配置信息，根据被恢复虚拟机的配置信息创建恢复虚拟机及其本地存储单元。进而可在接收到虚拟机启动命令时，从云服务器中下载基本系统数据，根据基本系统数据启动恢复虚拟机，提高了虚拟机的启动效率。启动恢复虚拟机之后可在接收到IO请求时从云服务器中下载相应的数据来响应IO请求，保障了恢复虚拟机的更多功能的实现，提高了虚拟机的恢复效率。
结合第一方面，在第一种可能的实现方式中，所述方法还包括：
在被恢复虚拟机启动时，记录从所述被恢复虚拟机开始启动到所述被恢复虚拟机能够正常运行所需要的基本系统数据的位图信息，所述位图信息包括所述基本系统数据中的子数据的起始位置及长度，并将所述位图信息存储至所述云服务器中；
所述从云服务器获取并下载基本系统数据包括：
从所述云服务器中获取所述基本系统数据的位图信息，根据所述位图信息在所述云服务器中所备份的所述被恢复虚拟机的操作系统中获取所述基本系统数据，下载所述基本系统数据。
本申请可在被虚拟机正常启动的过程中，记录被恢复虚拟机正常运行所需的基本系统数据的位图信息并存储至云服务器，进而可在虚拟机恢复时，根据基本系统数据的位图信息从云服务器中下载基本系统数据，用于恢复虚拟机的启动，提高了被恢复虚拟机的基本系统数据的下载效率，进而可提高虚拟机的启动效率。
结合第一方面，在第二种可能的实现方式中，所述被恢复虚拟机 中的数据被划分成预设大小的数据块，并在被备份至所述云服务器时，以所划分的数据块进行存储。
本申请将被恢复虚拟机的数据按照数据块存储的方式备份并存储至云服务器，可提高从云服务器中下载被恢复虚拟机的数据时数据的查找和下载的便捷性，增强了远程备份数据直接用于虚拟机的恢复的可选性。
结合第一方面第二种可能的实现方式，在第三种可能的实现方式中，所述方法还包括：
在对所述被恢复虚拟机中的数据进行增量备份时，统计每个所述数据块被备份的次数；
在所述虚拟机管理设备的空闲时间，根据所统计的每个所述数据块被备份的次数从所述云服务器端下载数据块，其中，备份次数越多的数据块下载的优先级越高。
本申请可在响应虚拟机的访问操作的空闲碎片时间从云服务器中下载被恢复虚拟机的数据中除了基本系统数据之外的其他数据块，可充分利用虚拟机启动之后的时间下载数据，缩短虚拟机启动的时间，提高了虚拟机恢复的效率。
结合第一方面至第一方面第三种可能的实现方式中任一种，在第四种可能的实现方式中，所述被恢复虚拟机的配置信息可包括：中央处理器CPU个数、内存大小、磁盘个数以及每个所述磁盘的大小中的至少一种。
本申请可根据被恢复虚拟机的配置信息创建一个与所述被恢复虚拟机具有相同配置信息的恢复虚拟机，以及恢复虚拟机对应的本地存储单元，提高了被恢复虚拟机的恢复的准确性。
第二方面提供了一种虚拟机管理设备，所述虚拟机管理设备将被恢复虚拟机中的数据备份至云服务器，其可包括：
接收模块，用于接收虚拟机恢复命令；
创建模块，用于在所述接收模块接收到所述虚拟机恢复命令时，从所述云服务器获取被恢复虚拟机的配置信息，根据所述配置信息创 建恢复虚拟机及所述恢复虚拟机对应的本地存储单元；
所述接收模块，还用于接收虚拟机启动命令；
下载模块，用于在所述接收模块接收到所述启动命令时，从所述云服务器获取并下载基本系统数据；
启动模块，用于根据所述下载模块下载得到的所述基本系统数据启动所述恢复虚拟机，所述基本系统数据为操作系统中使所述恢复虚拟机能够正常运行的数据；
所述接收模块，还用于接收IO请求；
所述下载模块，还用于确定与所述接收模块接收的所述IO请求相关的数据是否存储在所述本地存储单元中，若不存在，则从所述云服务器下载与所述IO请求相关的数据至所述本地存储单元，并返回所述IO请求所请求的数据。
结合第二方面，在第一种可能的实现方式中，所述虚拟机管理设备还包括：
备份模块，用于在被恢复虚拟机启动时，记录从所述被恢复虚拟机开始启动到所述被恢复虚拟机能够正常运行所需要的基本系统数据的位图信息，所述位图信息包括所述基本系统数据中的子数据的起始位置及长度，并将所述位图信息存储至所述云服务器中；
所述下载模块具体用于：
从所述云服务器中获取所述基本系统数据的位图信息，根据所述位图信息在所述云服务器中所备份的所述被恢复虚拟机的操作系统中获取所述基本系统数据，下载所述基本系统数据。
结合第二方面，在第二种可能的实现方式中，所述备份模块还用于：
将所述被恢复虚拟机中的数据划分成预设大小的数据块，并在将所述被恢复虚拟机中的数据备份至所述云服务器时，将所述数据以划分得到的数据块进行存储。
结合第二方面第二种可能的实现方式，在第三种可能的实现方式中，所述备份模块还用于：
在对所述被恢复虚拟机中的数据进行增量备份时，统计每个所述数据块被备份的次数；
所述下载模块，还用于在所述虚拟机管理设备的空闲时间，根据所述备份模块所统计的每个所述数据块被备份的次数从所述云服务器端下载数据块，其中，备份次数越多的数据块下载的优先级越高。
结合第二方面至第二方面第三种可能的实现方式中任一种，在第四种可能的实现方式中，所述被恢复虚拟机的配置信息可包括：中央处理器CPU个数、内存大小、磁盘个数以及每个所述磁盘的大小中的至少一种。
第三方面提供了一种虚拟机管理设备，其可包括：处理器、存储器、总线和通信接口；
所述存储器用于存储计算机执行指令，所述处理器与所述存储器通过所述总线连接；
当所述虚拟机管理设备运行时，所述处理器执行所述存储器中存储的所述计算机执行指令，以使所述虚拟机管理设备执行上述虚拟机恢复的方法。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明一实施例提供的虚拟机管理设备的结构示意图；
图2是本发明实施例提供的虚拟机恢复的方法的流程示意图；
图3是本发明实施例提供的数据块的增量备份的次数的统计示意图；
图4是本发明另一实施例提供的虚拟机管理设备的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
目前，远程备份数据无法直接用于虚拟机的恢复，虚拟机的恢复技术不能支持远程备份数据的核心技术难题有两个，其一为：一般虚拟机恢复时，数据访问需要达到30MB/s(240Mbps)的带宽要求，而现有的远程数据的访问带宽往往达不到这个要求，使得远程备份数据无法直接用于虚拟机的恢复。其二为：远程备份数据往往以顺序方式保存和读取，无法满足虚拟机恢复时对备份数据的随机访问需要。比如，远程数据备份到云存服务器最常见的方式是以简单存储服务(Simple Storage Service，S3)协议操作的，而S3协议要求数据以对象为单位，数据顺序上传保存，顺序下载获取，使得远程备份数据无法直接用于虚拟机的恢复。
本发明实施例通过备份数据预读取和备份数据的分块保存相组合的方式来解决所述远程备份数据不可直接用于虚拟机恢复的两大技术难题。下面将结合图1至图4对本发明实施例提供的虚拟机恢复的方法及设备进行描述。
参见图1，图1是本发明一实施例提供的虚拟机管理设备的实施例结构示意图。本发明实施例中所描述的虚拟机管理设备包括：处理器1001、存储器1002、系统总线1004和通信接口1005。处理器1001、存储器1002和通信接口1005之间通过系统总线1004连接并完成相互间的通信。
处理器1001可能为单核或多核中央处理单元，或者为特定集成电路，或者为被配置成实施本发明实施例的一个或多个集成电路。
存储器1002可以为高速RAM存储器，也可以为非易失性存储器(non-volatile memory)，例如至少一个磁盘存储器。
存储器1002用于存储计算机执行指令。处理器1001运行所述计算机执行指令1，可以执行图2所示的方法。
参见图2，图2是本发明实施例提供的虚拟机恢复的方法的流程示意图。本发明实施例中所描述的虚拟机恢复的方法，应用于虚拟机管理设备，其中，所述虚拟机管理设备将被恢复虚拟机中的数据备份至云服务器。本发明实施例中所描述的虚拟机恢复的方法，包括步骤：
S101，接收虚拟机恢复命令，从所述云服务器获取被恢复虚拟机的配置信息，根据所述配置信息创建恢复虚拟机及所述恢复虚拟机对应的本地存储单元。
具体实现中，用户进行虚拟机恢复操作时，可首先通过虚拟机管理设备上的用户操作指示向虚拟机管理设备发送虚拟化恢复命令，触发虚拟机管理设备进行被恢复虚拟机的恢复。其中，所述被恢复虚拟机为因为灾难等原因出现数据损坏或者丢失等故障，需要进行数据恢复的虚拟机。
虚拟机管理设备接收到虚拟机恢复命令之后，可从云服务器获取被恢复虚拟机的配置信息，进而可根据所述被恢复虚拟机的配置信息创建恢复虚拟机和恢复虚拟机对应的本地存储单元。其中，所述恢复虚拟机为虚拟机管理设备新建的一个虚拟机，用于替代被恢复虚拟机，进而可将被恢复虚拟机的数据恢复至所述恢复虚拟机中。具体实现中，所述被恢复虚拟机的配置信息可包括：虚拟机的中央处理器(英文：Central Processing Unit，CPU)个数、内存大小、磁盘个数以及每个磁盘的大小等，在此不做限制。虚拟机管理设备从云服务器获取得到所述被恢复虚拟机的配置信息之后，则可根据所述配置信息创建一个与所述被恢复虚拟机具有相同配置信息的恢复虚拟机，以及恢复虚拟机对应的本地存储单元。其中，所述恢复虚拟机对应的本地存储单元具体可为恢复虚拟机的本地磁盘。具体实现中，所述云服务器对应的存储空间具体可为S3云存储空间，在此不做限制。
S102，接收虚拟机启动命令，从所述云服务器获取并下载基本系统数据，并根据所述基本系统数据启动所述恢复虚拟机。
具体实现中，虚拟机管理设备创建了恢复虚拟机及其对应的本地 存储单元之后，可输出创建完成的通知信息至虚拟机管理设备的用户操作界面，以供用户查阅。用户确定恢复虚拟机及其对应的本地存储单元创建完成之后，则可通过虚拟机管理设备上的相关操作指示向虚拟机管理设备发送虚拟机启动命令，以触发虚拟机管理设备进行恢复虚拟机的启动。
虚拟机管理设备接收到虚拟机启动命令之后，可从云服务器获取并下载被恢复虚拟机的基本系统数据，进而可根据所述基本系统数据启动恢复虚拟机。其中，所述基本系统数据为操作系统中使恢复虚拟机能够正常运行的数据。具体实现中，被恢复虚拟机备份存储在云服务器中的操作系统包含两部分数据，一部分为操作系统的基本系统数据，即用以使虚拟机正常运行的数据，如驱动程序等；另外一部分为操作系统自带或者附带的应用程序，其中所述操作系统自带的应用程序可包括附件中的画图、计算器以及写字板等，进一步的，所述操作系统附带的应用程序可为用户设置的快速启动栏中的应用程序等。
具体实现中，虚拟机管理设备将被恢复虚拟机中的数据备份至云服务器的过程中，可在被恢复虚拟机处于正常工作状态下进行，即被恢复虚拟机出现故障之前进行，具体的，虚拟机管理设备可在被恢复虚拟机正常启动的过程中，记录从被恢复虚拟机开始启动到被恢复虚拟机能够正常运行所需要的基本系统数据的位图信息，并将所述位图信息存储至云服务器中，以完成被恢复虚拟机的基本系统数据的备份。其中，所述基本系统数据的位图信息包括：基本系统数据中的子数据的起始位置和长度。
虚拟机管理设备创建了恢复虚拟机之后，可从云服务器中获取所述基本系统数据的位图信息，进而可根据所述位图信息中的基本系统数据的子数据的起始位置和长度从云服务器中所备份的被恢复虚拟机的操作系统中查找得到所述基本系统数据，将所述基本系统数据下载到恢复虚拟机中，以根据所述基本系统数据启动恢复虚拟机。
具体实现中，虚拟机管理设备将被恢复虚拟机中的数据备份至云服务器的时，可将被恢复虚拟机中的数据划分成预设大小的数据块，进而可再将数据备份至云服务器时，以划分得到的数据块进行存储。 虚拟机管理设备将被恢复虚拟机的数据进行分块保存，在虚拟机恢复时可按照数据块的方式进行数据下载，使得虚拟机管理设备可从云服务器中首先获取并下载基本系统数据，并根据基本系统数据启动恢复虚拟机，提高了虚拟机恢复的效率。
S103，接收IO请求，确定与所述IO请求相关的数据是否存储在所述本地存储单元中，若不存在，则从所述云服务器下载与所述IO请求相关的数据至所述本地存储单元，并返回所述IO请求所请求的数据。
具体实现中，虚拟机管理设备启动了恢复虚拟机之后，用户则可对恢复虚拟机进行数据的读写操作。用户可通过虚拟机管理设备上的用户操作指示进行操作，向虚拟机管理设备发送输入/输出(英文：Input/Output，IO)请求。其中，所述IO请求可包括数据的读操作和写操作对应的请求指令，在此不做限制。虚拟机管理设备接收到IO请求之后，可首先确定与所述IO请求相关的数据是否存储所述本地存储单元中。例如，虚拟机管理设备接收到读操作的请求指令之后，可首先确定所述读操作的请求指令所请求读取的数据是否存储本地存储单元中。若所述IO请求所请求的数据存储在本地存储单元中，则可直接返回所述IO请求所请求的数据。若所述IO请求所请求的数据不存在本地存储单元中，虚拟机管理设备则可从云服务器下载所述IO请求所请求的数据至本地存储单元，在返回所述IO请求所请求的数据。
进一步的，虚拟机管理设备对被恢复虚拟机中的数据进行备份时，还可使用增量备份的方式对被恢复虚拟机中的数据进行备份。其中，所述增量备份是指把在前一次备份到本次备份这段时间间隔中进行过修改的数据进行备份，没有修改的数据不做备份的备份方式。即只备份变化了的数据，没有变化的数据不备份。由此，某个数据块是否是活跃数据，可以通过增量备份中出现的次数来确定。虚拟机管理设备在对被恢复虚拟机中的数据进行增量备份时，可统计每个数据块被备份的次数，进而可在虚拟机管理设备的空闲时间，根据所述所统计的每个数据块被备份的次数从云服务器端下载数据块。其中，备份次数越多的数据块下载的优先级越高。如图3，图3是数据块的增量备份的次数的统计示意图。其中，备份(英文：backup)1至backup4表 示第一次增量备份至第四次增量备份，其中，B0、B1、B2、…和B15，表示数据块0、数据块1、数据块2、…和数据块15，频率(英文：frequency)表示各个数据块的增量备份的次数，其中增量备份的次数越多的数据块的使用概率越高。如图3所示，B13的增量备份的次数为4次，B13的增量备份的次数大于其他数据块的增量备份的次数，由此可知B13的使用概率最高。B2的增量备份的次数为3次，B2的增量备份的次数少于B13的增量备份的次数，大于其他数据块的增量备份的次数，由此可知B2的使用概率低于B13的使用概率，高于其他数据块的使用概率。虚拟机管理设备可按照各个数据块被备份的次数从多到少的顺序，确定各个数据块被下载的优先级为从高到低，进而可按照所述优先级从高到低下载所述各个数据块，使用概率更高的数据块优先下载以保障恢复虚拟机更快地恢复被恢复虚拟机的功能。
在本发明实施例中，虚拟机管理设备可将被恢复虚拟机的数据按照数据块存储的方式备份并存储至云服务器，进而可根据虚拟机启动所需的基本系统数据的位置和长度等位图信息从云服务器中下载虚拟机所述基本系统数据，并根据所述基本系统数据启动恢复虚拟机。启动恢复虚拟机之后可响应虚拟机的访问操作的IO请求，若访问操作需要从S3云存储空间中下载数据，则从S3云存储空间中下载相应的数据并写入本地存储单元，以响应虚拟机的访问操作。进一步的，虚拟机管理设备可在响应虚拟机的访问操作的空闲碎片时间从云服务器中下载被恢复虚拟机的数据中除了基本系统数据之外的其他数据块，可充分利用虚拟机启动之后的时间下载数据，缩短虚拟机启动的时间，提高了虚拟机恢复的效率。
参见图4，是本发明另一实施例提供的虚拟机管理设备的结构示意图。本发明实施例中所描述的虚拟机管理设备，包括：
接收模块10，用于接收虚拟机恢复命令。
创建模块20，用于在所述接收模块接收到所述虚拟机恢复命令时，从所述云服务器获取被恢复虚拟机的配置信息，根据所述配置信息创建恢复虚拟机及所述恢复虚拟机对应的本地存储单元。
所述接收模块10，还用于接收虚拟机启动命令。
下载模块30，用于在所述接收模块接收到所述启动命令时，从所述云服务器获取并下载基本系统数据。
启动模块40，用于根据所述下载模块下载得到的所述基本系统数据启动所述恢复虚拟机，所述基本系统数据为操作系统中使所述恢复虚拟机能够正常运行的数据。
所述接收模块10，还用于接收IO请求。
所述下载模块30，还用于确定与所述接收模块接收的所述IO请求相关的数据是否存储在所述本地存储单元中，若不存在，则从所述云服务器下载与所述IO请求相关的数据至所述本地存储单元，并返回所述IO请求所请求的数据。
在一些可行的实施方式中，本发明实施例中所描述的虚拟机管理设备还包括：
备份模块50，用于在被恢复虚拟机启动时，记录从所述被恢复虚拟机开始启动到所述被恢复虚拟机能够正常运行所需要的基本系统数据的位图信息，所述位图信息包括所述基本系统数据中的子数据的起始位置及长度，并将所述位图信息存储至所述云服务器中；
所述下载模块30具体用于：
从所述云服务器中获取所述基本系统数据的位图信息，根据所述位图信息在所述云服务器中所备份的所述被恢复虚拟机的操作系统中获取所述基本系统数据，下载所述基本系统数据。
在一些可行的实施方式中，所述备份模块50还用于：
将所述被恢复虚拟机中的数据划分成预设大小的数据块，并在将所述被恢复虚拟机中的数据备份至所述云服务器时，将所述数据以划分得到的数据块进行存储。
在一些可行的实施方式中，所述备份模块50还用于：在对所述被恢复虚拟机中的数据进行增量备份时，统计每个所述数据块被备份的次数；
所述下载模块30，还用于在所述虚拟机管理设备的空闲时间，根据所述备份模块所统计的每个所述数据块被备份的次数从所述云服 务器端下载数据块，其中，备份次数越多的数据块下载的优先级越高。
具体实现中，所述虚拟机管理设备可用于执行本发明实施例提供的虚拟机恢复的方法的实施例中所描述的实现方式，具体可参见所述实施例中各个步骤所描述的实现方式，在此不再赘述。
在本发明实施例中，虚拟机管理设备可将被恢复虚拟机的数据按照数据块存储的方式备份并存储至云服务器，进而可根据虚拟机启动所需的基本系统数据的位置和长度等位图信息从云服务器中下载虚拟机所述基本系统数据，并根据所述基本系统数据启动恢复虚拟机。启动恢复虚拟机之后可响应虚拟机的访问操作的IO请求，若访问操作需要从S3云存储空间中下载数据，则从S3云存储空间中下载相应的数据并写入本地存储单元，以响应虚拟机的访问操作。进一步的，虚拟机管理设备可在响应虚拟机的访问操作的空闲碎片时间从云服务器中下载被恢复虚拟机的数据中除了基本系统数据之外的其他数据块，可充分利用虚拟机启动之后的时间下载数据，缩短虚拟机启动的时间，下载数据块时还可根据数据块的备份次数确定相关数据的下载顺序，使用概率更高的数据块优先下载以保障恢复虚拟机的正常使用，提高了虚拟机恢复的效率。
本领域普通技术人员可以理解实现所述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如所述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
以上所揭露的仅为本发明较佳实施例而已，当然不能以此来限定本发明之权利范围，因此依本发明权利要求所作的等同变化，仍属本发明所涵盖的范围。

Claims (9)

  1. 一种虚拟机恢复的方法，应用于虚拟机管理设备，所述虚拟机管理设备将被恢复虚拟机中的数据备份至云服务器，其特征在于，包括：
    接收虚拟机恢复命令，从所述云服务器获取被恢复虚拟机的配置信息，根据所述配置信息创建恢复虚拟机及所述恢复虚拟机对应的本地存储单元；
    接收虚拟机启动命令，从所述云服务器获取并下载基本系统数据，并根据所述基本系统数据启动所述恢复虚拟机，所述基本系统数据为操作系统中使所述恢复虚拟机能够正常运行的数据；
    接收IO请求，确定与所述IO请求相关的数据是否存储在所述本地存储单元中，若不存在，则从所述云服务器下载与所述IO请求相关的数据至所述本地存储单元，并返回所述IO请求所请求的数据。
  2. 如权利要求1所述的方法，其特征在于，所述方法还包括：
    在被恢复虚拟机启动时，记录从所述被恢复虚拟机开始启动到所述被恢复虚拟机能够正常运行所需要的基本系统数据的位图信息，所述位图信息包括所述基本系统数据中的子数据的起始位置及长度，并将所述位图信息存储至所述云服务器中；
    所述从云服务器获取并下载基本系统数据包括：
    从所述云服务器中获取所述基本系统数据的位图信息，根据所述位图信息在所述云服务器中所备份的所述被恢复虚拟机的操作系统中获取所述基本系统数据，下载所述基本系统数据。
  3. 如权利要求1所述的方法，其特征在于，所述被恢复虚拟机中的数据被划分成预设大小的数据块，并在被备份至所述云服务器时，以所划分的数据块进行存储。
  4. 如权利要求3所述的方法，其特征在于，所述方法还包括：
    在对所述被恢复虚拟机中的数据进行增量备份时，统计每个所述数据块被备份的次数；
    在所述虚拟机管理设备的空闲时间，根据所统计的每个所述数据块被备份的次数从所述云服务器端下载数据块，其中，备份次数越多的数据块下载的优先级越高。
  5. 一种虚拟机管理设备，所述虚拟机管理设备将被恢复虚拟机中的数据备份至云服务器，其特征在于，包括：
    接收模块，用于接收虚拟机恢复命令；
    创建模块，用于在所述接收模块接收到所述虚拟机恢复命令时，从所述云服务器获取被恢复虚拟机的配置信息，根据所述配置信息创建恢复虚拟机及所述恢复虚拟机对应的本地存储单元；
    所述接收模块，还用于接收虚拟机启动命令；
    下载模块，用于在所述接收模块接收到所述启动命令时，从所述云服务器获取并下载基本系统数据；
    启动模块，用于根据所述下载模块下载得到的所述基本系统数据启动所述恢复虚拟机，所述基本系统数据为操作系统中使所述恢复虚拟机能够正常运行的数据；
    所述接收模块，还用于接收IO请求；
    所述下载模块，还用于确定与所述接收模块接收的所述IO请求相关的数据是否存储在所述本地存储单元中，若不存在，则从所述云服务器下载与所述IO请求相关的数据至所述本地存储单元，并返回所述IO请求所请求的数据。
  6. 如权利要求5所述的虚拟机管理设备，其特征在于，所述虚拟机管理设备还包括：
    备份模块，用于在被恢复虚拟机启动时，记录从所述被恢复虚拟机开始启动到所述被恢复虚拟机能够正常运行所需要的基本系统数据的位图信息，所述位图信息包括所述基本系统数据中的子数据的起始位置及长度，并将所述位图信息存储至所述云服务器中；
    所述下载模块具体用于：
    从所述云服务器中获取所述基本系统数据的位图信息，根据所述位图信息在所述云服务器中所备份的所述被恢复虚拟机的操作系统中获取所述基本系统数据，下载所述基本系统数据。
  7. 如权利要求5所述的虚拟机管理设备，其特征在于，所述备份模块还用于：
    将所述被恢复虚拟机中的数据划分成预设大小的数据块，并在将所述被恢复虚拟机中的数据备份至所述云服务器时，将所述数据以划分得到的数据块进行存储。
  8. 如权利要求7所述的虚拟机管理设备，其特征在于，所述备份模块还用于：
    在对所述被恢复虚拟机中的数据进行增量备份时，统计每个所述数据块被备份的次数；
    所述下载模块，还用于在所述虚拟机管理设备的空闲时间，根据所述备份模块所统计的每个所述数据块被备份的次数从所述云服务器端下载数据块，其中，备份次数越多的数据块下载的优先级越高。
  9. 一种虚拟机管理设备，其特征在于，包括：处理器、存储器、总线和通信接口；
    所述存储器用于存储计算机执行指令，所述处理器、所述存储器和所述通信接口通过所述总线连接；
    当所述虚拟机管理设备运行时，所述处理器执行所述存储器中存储的所述计算机执行指令，以使所述虚拟机管理设备执行如权利要求1-4任一项所述的方法。
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