CN101594387A - The virtual cluster deployment method and system - Google Patents
The virtual cluster deployment method and system Download PDFInfo
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- CN101594387A CN101594387A CNA2009100880176A CN200910088017A CN101594387A CN 101594387 A CN101594387 A CN 101594387A CN A2009100880176 A CNA2009100880176 A CN A2009100880176A CN 200910088017 A CN200910088017 A CN 200910088017A CN 101594387 A CN101594387 A CN 101594387A
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Abstract
The invention provides a kind of virtual cluster deployment method and system, this method comprises: according to deployment request that receives and default allocation strategy, specify the mapping relations between dummy node to be created and the physical node; Physical node multicast transmission in described mapping relations and described dummy node corresponding virtual machine image file to be created; Utilization is transferred to the virtual machine image file of the physical node in the described mapping relations, creates dummy node, and disposes described dummy node.The embodiment of the invention is carried out the transmission of virtual machine image file by using the multicast transmission mode, make mirror image server can at one time virtual machine image file be transferred to a plurality of physical nodes, saved the use of transmission network bandwidth, reduced the traffic load of mirror image server, promptly shorten the virtual cluster deployment time, reduced the transfer of data burden of mirror image server in the virtual cluster deployment process.
Description
Technical field
The embodiment of the invention relates to the virtual machine technique field, relates in particular to a kind of virtual cluster deployment method and system.
Background technology
Virtual machine technique be a kind of be effectively management and the important technical of fully sharing physical resource, can between soft, the hardware of computer system, introduce level of abstraction, for upper layer application provides independently running environment, dynamic, the isomerism of shielding lower floor hardware are realized the shared multiplexing of hardware resource.Virtual Cluster is meant with the physical resource pond as run time infrastructure, the Virtual Cluster computing environment of utilizing virtual machine technique to provide for the user desirably, and wherein, the physical resource pond is physical computing resources such as physical cluster, multiple-workstation or many PCs.
The virtual cluster deployment process is meant that system creates the process of Virtual Cluster desirably for the user, promptly contain the Virtual Cluster descriptor (the Virtual Cluster descriptor comprises: after request information such as software/hardware configuration requirement, dummy node (being virtual machine) number and Software Edition), system is the process of user's establishment Virtual Cluster in dynamic on-demand ground in the physical resource pond receiving.
Existing virtual cluster deployment process is: go up the request according to the user at physical machine (being physical node), create the dummy node of appointment; Virtual machine image file is prepared; According to the configuration requirement in user's request, each dummy node is done corresponding configuration, for example network connects configuration, application profiles modification etc.; Start dummy node; Wherein, virtual machine image file is the disk file that has encapsulated the whole operation system.In this virtual cluster deployment process, the time overhead that virtual machine image file prepares to be spent has occupied the major part of whole virtual cluster deployment time, wherein, virtual machine image file time of preparing to be spent is subjected to the restriction of the physical node number of transmission network bandwidth, dummy node number, download.Existing virtual machine image file stand-by mode has pre-stored, incremental transmission and complete transmission; Pre-stored is to store all virtual machine image file on each physical node in advance; Incremental transmission is the minimum virtual machine image file (only comprising operating system) of storing all dummy nodes on each physical node in advance, adds file (related software for example is installed) in the virtual cluster deployment process again in minimum virtual machine image file; Complete transmission is a not pre-stored virtual machine image file of physical node, the complete virtual machine image file of transmission in the virtual cluster deployment process.
And in the existing virtual machine image file set-up procedure, the virtual machine image file circulation way is " point-to-point " unicast transmission mode, promptly initiate response by each physical node (virtual machine image file reciever) to mirror image server (virtual machine image file is stored in the mirror image server), mirror image server and each physical node connect and begin the transmission of virtual machine image file; In the process of virtual machine image file transmission, mirror image server need be safeguarded a plurality of connections, causes the transfer of data burden of mirror image server big; In addition, the virtual machine image file transmission of repetition is carried out in a plurality of connections, the bandwidth of having wasted transmission network, and the time that causes the virtual machine image file preparation to be spent is longer, causes the virtual cluster deployment time longer thus.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of virtual cluster deployment method and system, in order to shorten the virtual cluster deployment time, reduces the transfer of data burden in the virtual cluster deployment process.
To achieve these goals, the embodiment of the invention provides a kind of virtual cluster deployment method, comprising:
According to deployment request that receives and default allocation strategy, specify the mapping relations between dummy node to be created and the physical node;
Physical node multicast transmission in described mapping relations and described dummy node corresponding virtual machine image file to be created;
Utilization is transferred to the virtual machine image file of the physical node in the described mapping relations, creates dummy node, and disposes described dummy node.
The embodiment of the invention provides a kind of virtual cluster deployment system, comprising:
Resource distribution module is used for specifying the mapping relations between dummy node to be created and the physical node according to deployment request that receives and default allocation strategy;
The mirror image transport module is used for physical node multicast transmission and described dummy node corresponding virtual machine image file to be created to described mapping relations;
Dispose Executive Module, be used for utilizing the virtual machine image file of the physical node that is transferred to described mapping relations, create dummy node, and dispose described dummy node.
The virtual cluster deployment method and system that the embodiment of the invention provides, carry out the transmission of virtual machine image file by using the multicast transmission mode, make mirror image server can at one time virtual machine image file be transferred to a plurality of physical nodes, saved the use of transmission network bandwidth, reduced the traffic load of mirror image server, promptly shorten the virtual cluster deployment time, reduced the transfer of data burden of mirror image server in the virtual cluster deployment process.
Description of drawings
Fig. 1 is the structural representation of existing virtual cluster system;
Fig. 2 is the schematic flow sheet of virtual cluster deployment method embodiment one of the present invention;
Fig. 3 is the schematic flow sheet of virtual cluster deployment method embodiment two of the present invention;
Fig. 4 is the structural representation of virtual cluster deployment system embodiment one of the present invention;
Fig. 5 is the structural representation of virtual cluster deployment system embodiment two of the present invention.
Embodiment
Further specify the technical scheme of the embodiment of the invention below in conjunction with the drawings and specific embodiments.
Virtual machine technique is the computer system that has the complete hardware system function by the software engineering simulation, make and to move polytype operating system independently simultaneously on the physical computer, and fail safe, isolation, the transparency and portable of operating system are provided.In addition, virtual machine technique by with software encapsulation in virtual machine image file (disk file that has encapsulated the whole operation system is called virtual machine image file), utilize the function such as deployment, migration of software virtual machine, can under network environment, realize the distribution and the deployment of software flexibly.
Fig. 1 is the structural representation of existing virtual cluster system.As shown in Figure 1, Virtual Cluster comprises a plurality of dummy nodes (each dummy node is a virtual machine), dummy node in the Virtual Cluster interconnects by physics or virtual network, physical node in the physical resource pond (each physical node is a physical computer) is gone up operation, all virtual machine image file of storage in the mirror image server, mode by pre-stored, incremental transmission or complete transmission, mirror image server is transferred to specific physical node with virtual machine image file, to generate dummy node, further form Virtual Cluster.The virtual computation environmental that Virtual Cluster is made up of a plurality of dummy nodes is similar to physical cluster on function and network topology.The virtual computation environmental that the Virtual Cluster technology can provide dynamically for the multi-user, accurately customize certainly by the effective of physical resource shared and efficiently management, significantly improves the utilance of resource simultaneously.
Fig. 2 is the schematic flow sheet of virtual cluster deployment method embodiment one of the present invention, and as shown in Figure 2, this method embodiment specifically can comprise:
After receiving the request of deployment, preserve this deployment request, and add this deployment request to the request management formation; From the request management formation, read this deployment request, and according to this allocation strategy of disposing request and presetting, specify the mapping relations between dummy node to be created and the physical node, promptly specify the number of physical node and the dummy node that each appointed physical node will be created that will create dummy node, each physical node can be created a plurality of dummy nodes; Wherein, this deployment request can comprise: the descriptor of dummy node to be created and with the descriptor of dummy node corresponding virtual machine image file to be created.
According to the mapping relations of having set up, adopt the physical node transfer of virtual machine image file of multicast transmission mode in mapping relations, wherein this virtual machine image file is corresponding with dummy node to be created; Multicast (ip multicast) is a kind of data source by using a multicast address that data are sent to the communication mode of a plurality of recipients on the network at one time in mode efficiently, and promptly single-point is to multiple spot, or multiple spot is to the data communication mode of multiple spot.
According to the deployment request that receives, the virtual machine image file of using the physical node in the mapping relations to receive is created dummy node on this physical node; And dispose request according to this, be configured, thus, finished virtual cluster deployment creating the dummy node of finishing.
The virtual cluster deployment method that the inventive method embodiment one provides, carry out the transmission of virtual machine image file by using the multicast transmission mode, make the mirror image transport module can at one time virtual machine image file be transferred to a plurality of physical nodes, saved the use of transmission network bandwidth, reduced the traffic load of mirror image server, promptly shorten the virtual cluster deployment time, reduced the transfer of data burden of mirror image server in the virtual cluster deployment process.
Fig. 3 is the schematic flow sheet of virtual cluster deployment method embodiment two of the present invention, and as shown in Figure 3, this method embodiment specifically can comprise:
After receiving the request of deployment, preserve this deployment request, and add this deployment request to the request management formation; From the request management formation, read this deployment request, and dispose request and default allocation strategy, specify the mapping relations between dummy node to be created and the physical node according to this; Wherein, this deployment request can comprise: the descriptor of dummy node to be created and with the descriptor of dummy node corresponding virtual machine image file to be created.
Wherein, default allocation strategy can be preassigned, and the existing multiple allocation strategy that is used to specify dummy node and physical node mapping relations can be used in embodiments of the present invention.For example: default allocation strategy can be according to the operating position of physical node resource and the virtual machine image file memory space storage condition of physical node, specifies the mapping relations between dummy node to be created and the physical node; Concrete, the operating position of physical node resource can be the physical node number of corresponding virtual node, and whether the virtual machine image file memory space storage condition of physical node can for having stored virtual machine image file in the virtual machine image file memory space of physical node; Default allocation strategy can comprise: when physical node when the number of corresponding virtual node has reached the maximum that this physical node can corresponding dummy node number, this physical node just can not corresponding again dummy node; When having stored virtual machine image file in the virtual machine image file memory space of a physical node, this physical node preferentially be considered with dummy node do the mapping corresponding.By real-time inquiry physical node, obtain the operating position of physical node resource and the virtual machine image file storage condition of physical node, wherein, the operating position of resource service recorder table storage physical node resource, the virtual machine image file storage condition of caching record table storage physical node.
When default allocation strategy is when specifying mapping relations according to the virtual machine image file memory space storage condition of the operating position of physical node resource and physical node, after receiving the default allocation strategy in the request of deployment, from resource service recorder table and buffer memory record sheet, obtain the operating position of physical node resource and the virtual machine image file memory space storage condition of physical node, specify mapping relations between dummy node to be created and the physical node according to default allocation strategy, and preserve the mapping relations that this appointment is finished.Above-mentioned default allocation strategy only as a specific embodiment, does not limit allocation strategy at this, and existing allocation strategy all may be used among the present invention.
According to the mapping relations of having preserved, will there be a plurality of physical nodes of mapping relations to add the multicast group with dummy node to be created.
Store mode the physical node transfer of virtual machine image file to the multicast group set up in of the mirror image server of all virtual machine image file with multicast transmission, this virtual machine image file is corresponding with dummy node to be created.Be included in a plurality of dummy nodes in the Virtual Cluster, its corresponding virtual machine image file is identical, and thus, mirror image server adopts the mode of multicast, and the same time is transferred to a plurality of physical nodes with a virtual machine image file.
Wherein, this virtual machine image file memory space can be a spatial cache.
Physical node is after the virtual machine image file that receives the mirror image server multicast transmission, and whether the virtual machine image file memory space of inquiring about this physical node is full; If the virtual machine image file memory space is filled with, then adopt least recently used (Least Recently Used, hereinafter to be referred as LRU) update mechanism, promptly search least-recently-used virtual machine image file in the virtual machine image file memory space, and should least-recently-used virtual machine image file delete, the virtual machine image file that will newly receive stores in the virtual machine image file memory space then; If the virtual machine image file memory space is not filled with, then the virtual machine image file that directly will newly receive stores in the virtual machine image file memory space.Further, before whether the virtual machine image file memory space of this physical node of inquiry has expired, can inquire about the identical file of virtual machine image file that whether has stored and newly received in the virtual machine image file memory space of this physical node earlier, if identical file is arranged, then do not need to preserve the virtual machine image file of new reception, promptly do not need to carry out the operation of above-mentioned steps 304 to step 306, if there is not identical file, then carry out the operation of above-mentioned steps 304 to step 306.
According to the content in the deployment request that receives, use the virtual machine image file in the physical node that has been transferred in the mapping relations, on this physical node, create dummy node, and dispose request according to this, be configured creating the dummy node of finishing; Wherein, when creating dummy node, be specially and create dummy node with Copy on write function; Wherein this dummy node with Copy on write function can adopt Copy on write mechanism to reuse virtual machine image file in the virtual machine image file memory space.
After dummy node is created and is finished, in to the layoutprocedure of dummy node and in the running of Virtual Cluster, a virtual machine image file on this dummy node corresponding physical node can be used by a plurality of dummy node, and promptly each dummy node can carry out read-write operation to virtual machine image file.In the prior art, when virtual machine image file is reused by a plurality of dummy nodes, adopt directly to copy and reuse or directly shared mode of reusing; Wherein directly copy is reused and is meant the disposable copy of just carrying out when dummy node starts at every turn virtual machine image file, dummy node carries out read-write operation to the copied files of virtual machine image file, this kind mode has increased the time overhead of Virtual Cluster operation because each dummy node that starts will copy; Directly share to reuse and be meant that dummy node directly carries out read-write operation to virtual machine image file, virtual machine image file constantly is modified in this kind mode, and dummy node to the read-write operation of virtual machine image file all be at original virtual machine image file (virtual machine image file that is not modified) carry out, the result that can cause dummy node that virtual machine image file is carried out read-write operation is inaccurate thus, causes Virtual Cluster operation failure.
And the dummy node of creating in the virtual cluster deployment method that the embodiment of the invention provides with Copy on write function when reusing virtual machine image file, adopts Copy on write mechanism.This Copy on write function is specially: when a plurality of dummy nodes carry out write operation to a virtual machine image file, only will carry out buffer memory to the modification that this virtual machine image file is carried out, dummy node obtains the read-write result to virtual machine image file according to the modification part in former virtual machine image file and the buffer memory.The embodiment of the invention is created the dummy node with Copy on write function, when having guaranteed that virtual machine image file is reused, and the normal operation of Virtual Cluster, and reduced the time overhead that Virtual Cluster moves.
All create and after configuration finishes, start each dummy node at each dummy node, make that disposing the Virtual Cluster of finishing can normally move.
The virtual cluster deployment method that the embodiment of the invention two provides, carry out the transmission of virtual machine image file by using the multicast transmission mode, make the mirror image transport module can at one time virtual machine image file be transferred to a plurality of physical nodes, saved the use of transmission network bandwidth, reduced the traffic load of mirror image server, promptly shorten the virtual cluster deployment time, reduced the transfer of data burden of mirror image server in the virtual cluster deployment process; This method adopts the LRU update mechanism to carry out the preservation of virtual machine image file, has guaranteed the normal preservation of virtual machine image file; And this method adopts the dummy node with Copy on write function, in the normal operation that guarantees Virtual Cluster, has reduced the time overhead of Virtual Cluster operation.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Fig. 4 is the structural representation of virtual cluster deployment system embodiment one of the present invention, and as shown in Figure 4, this system embodiment specifically can comprise:
After resource distribution module 41 receives the request of deployment, preserve this deployment request, and add this deployment request to the request management formation; Resource distribution module 41 reads this deployment request from the request management formation then, and disposes request and default allocation strategy according to this, specifies the mapping relations between dummy node to be created and the physical node; Wherein, this deployment request can comprise: the descriptor of dummy node to be created and with the descriptor of dummy node corresponding virtual machine image file to be created; Should can be kept in the resource distribution module by default allocation strategy, and should can specify in advance by the virtual cluster deployment system by default allocation strategy.
Mirror image transport module 43 is used for physical node multicast transmission and dummy node corresponding virtual machine image file to be created to mapping relations.
Mirror image transport module 43 adopts the physical node transfer of virtual machine image file of multicast transmission mode in mapping relations according to the mapping relations of having set up, and wherein this virtual machine image file is corresponding with dummy node to be created.
Dispose Executive Module 45, be used for utilizing the virtual machine image file of the physical node that is transferred to mapping relations, create dummy node, and dispose this dummy node.
Dispose Executive Module 45 according to the deployment request that receives, the virtual machine image file of using the physical node in the mapping relations to receive is created dummy node on this physical node; And dispose Executive Module 45 and dispose request, be configured, thus, finished virtual cluster deployment creating the dummy node of finishing according to this.
The virtual cluster deployment system that system embodiment one of the present invention provides, carry out the transmission of virtual machine image file by using the multicast transmission mode, make the mirror image transport module can at one time virtual machine image file be transferred to a plurality of physical nodes, saved the use of transmission network bandwidth, reduced the traffic load of mirror image server, promptly shorten the virtual cluster deployment time, reduced the transfer of data burden of mirror image server in the virtual cluster deployment process.
Fig. 5 is the structural representation of virtual cluster deployment system embodiment two of the present invention, and as shown in Figure 5, this system embodiment specifically can comprise:
Mirror image transport module 53 is used for physical node multicast transmission and dummy node corresponding virtual machine image file to be created to mapping relations.
Wherein, mirror image transport module 53 comprises: mirror image transmission control unit 531 and mirror image server 533; Mirror image transmission control unit 531 is used for and will has the physical node of mapping relations to add the multicast group with dummy node to be created; Mirror image server 533 is used for to the physical node multicast transmission of multicast group and dummy node corresponding virtual machine image file to be created.
Dispose Executive Module 55, be used for utilizing the virtual machine image file of the physical node that is transferred to mapping relations, establishment has the dummy node of Copy on write function, and disposes this dummy node.
This system embodiment can also comprise the judgement Executive Module, be used to judge whether the virtual machine image file memory space of physical node is full, if the virtual machine image file memory space of physical node is full, then delete least-recently-used file in the virtual machine image file memory space, and this virtual machine image file that will receive stores in the virtual machine image file memory space, if the virtual machine image file memory space of physical node less than, this virtual machine image file that then will receive stores in the virtual machine image file memory space.Need to prove, judge that Executive Module can be arranged on physical resource pond or the physical node, be used for after physical node receives virtual machine image file, the storage to this virtual machine image file is carried out in interpretation.
Referring to Fig. 5, the flow process that the virtual cluster deployment system that specifically describing system embodiment two of the present invention provides disposes Virtual Cluster.
After resource distribution module 51 receives the request disposed by request interface, preserve this deployments request and this deployment is asked to add in the request management formation; Resource distribution module 51 reads this deployment request from the request management formation then, and obtain the operating position of physical node resource and the virtual machine image file memory space storage condition of physical node in resource service recorder table from the monitoring resource module and the buffer memory record sheet, wherein, the monitoring resource module is obtained the operating position of physical node resource and the virtual machine image file storage condition of physical node by real-time inquiry physical node; The default allocation strategy of resource distribution module 51 bases is specified the mapping relations between dummy node to be created and the physical node then, and preserves the mapping relations that this appointment is finished; Mirror image transmission control unit 531 is according to the mapping relations of preserving in the resource distribution module 51, to have a plurality of physical nodes of mapping relations to add the multicast group with dummy node to be created, mirror image transmission control unit 531 indication mirror image servers 533 begin by network the physical node in the multicast group to be carried out multicast transmission then; Receive the virtual machine image file of mirror image server 533 multicast transmission when physical node after, judge whether Executive Module is inquired about the virtual machine image file memory space of this physical node full; If the virtual machine image file memory space is filled with, then adopt the LRU update mechanism, with least-recently-used virtual machine image file deletion in the virtual machine image file memory space, the virtual machine image file that will newly receive stores in the virtual machine image file memory space then; If the virtual machine image file memory space is not filled with, then the virtual machine image file that directly will newly receive stores in the virtual machine image file memory space; Dispose Executive Module 55 according to the content in the deployment request that receives, use the virtual machine image file in the physical node that has been transferred in the mapping relations, on this physical node, create dummy node with Copy on write function, and, be configured creating the dummy node of finishing according to this deployment request; At last, all create and after configuration finishes, start each dummy node, finish the deployment of Virtual Cluster at each dummy node.
The virtual cluster deployment system that the embodiment of the invention two provides, carry out the transmission of virtual machine image file by using the multicast transmission mode, make the mirror image transport module can at one time virtual machine image file be transferred to a plurality of physical nodes, saved the use of transmission network bandwidth, reduced the traffic load of mirror image server, promptly shorten the virtual cluster deployment time, reduced the transfer of data burden of mirror image server in the virtual cluster deployment process; This method adopts the LRU update mechanism to carry out the preservation of virtual machine image file, has guaranteed the normal preservation of virtual machine image file; And this method adopts the dummy node with Copy on write function, in the normal operation that guarantees Virtual Cluster, has reduced the time overhead of Virtual Cluster operation.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1, a kind of virtual cluster deployment method is characterized in that, comprising:
According to deployment request that receives and default allocation strategy, specify the mapping relations between dummy node to be created and the physical node;
Physical node multicast transmission in described mapping relations and described dummy node corresponding virtual machine image file to be created;
Utilization is transferred to the virtual machine image file of the physical node in the described mapping relations, creates dummy node, and disposes described dummy node.
2, method according to claim 1 is characterized in that, described physical node multicast transmission and described dummy node corresponding virtual machine image file to be created in described mapping relations comprises:
To there be the physical node of mapping relations to add the multicast group with described dummy node to be created;
Physical node multicast transmission in described multicast group and described dummy node corresponding virtual machine image file to be created.
3, method according to claim 2 is characterized in that, described physical node multicast transmission and described dummy node corresponding virtual machine image file to be created in described mapping relations also comprises afterwards:
If the virtual machine image file memory space of described physical node is full, then delete least-recently-used file in the described virtual machine image file memory space, and the described virtual machine image file that will receive stores in the described virtual machine image file memory space into;
If the virtual machine image file memory space of described physical node less than, the described virtual machine image file that then will receive stores in the described virtual machine image file memory space.
4, method according to claim 3 is characterized in that, described establishment dummy node comprises: create the dummy node with Copy on write function; Described dummy node with Copy on write function is reused the dummy node of the virtual machine image file in the described virtual machine image file memory space for adopting Copy on write mechanism.
5, according to the arbitrary described method of claim 1-4, it is characterized in that, also comprise after the described dummy node of described configuration: start each dummy node.
6, method according to claim 5, it is characterized in that, described default allocation strategy is: according to the operating position of physical node resource and the virtual machine image file memory space storage condition of physical node, specify the mapping relations between dummy node to be created and the physical node.
7, a kind of virtual cluster deployment system is characterized in that, comprising:
Resource distribution module is used for specifying the mapping relations between dummy node to be created and the physical node according to deployment request that receives and default allocation strategy;
The mirror image transport module is used for physical node multicast transmission and described dummy node corresponding virtual machine image file to be created to described mapping relations;
Dispose Executive Module, be used for utilizing the virtual machine image file of the physical node that is transferred to described mapping relations, create dummy node, and dispose described dummy node.
8, system according to claim 7 is characterized in that, described mirror image transport module comprises:
The mirror image transmission control unit is used for and will has the physical node of mapping relations to add the multicast group with described dummy node to be created;
Mirror image server is used for physical node multicast transmission and described dummy node corresponding virtual machine image file to be created to described multicast group.
9, system according to claim 8 is characterized in that, also comprises:
Judge Executive Module, be used to judge whether the virtual machine image file memory space of described physical node is full; If the virtual machine image file memory space of described physical node is full, then delete least-recently-used file in the described virtual machine image file memory space, and the described virtual machine image file that will receive stores in the described virtual machine image file memory space into; If the virtual machine image file memory space of described physical node less than, the described virtual machine image file that then will receive stores in the described virtual machine image file memory space.
10, system according to claim 9 is characterized in that, described establishment dummy node comprises: create the dummy node with Copy on write function; Described dummy node with Copy on write function is reused the dummy node of the virtual machine image file in the described virtual machine image file memory space for adopting Copy on write mechanism.
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