CN101739287A - Device, system and method for managing virtual machines - Google Patents
Device, system and method for managing virtual machines Download PDFInfo
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- CN101739287A CN101739287A CN200810181449A CN200810181449A CN101739287A CN 101739287 A CN101739287 A CN 101739287A CN 200810181449 A CN200810181449 A CN 200810181449A CN 200810181449 A CN200810181449 A CN 200810181449A CN 101739287 A CN101739287 A CN 101739287A
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Abstract
The invention discloses a device, system and method for managing virtual machines. The device is connected to at least two physical machines through special physical electrical connection, wherein a virtual machine on at least one physical machine needs to be transferred to at least one destination physical machine. The device comprises an input module, an operation module and a transferring module, wherein the input module is used for receiving external input; the operation module is configured for determining a source physical machine according to the field external input passing through the input module and further determining a destination physical machine to control the operation of the transferring module; and the transferring module is configured for transferring virtual machines to the destination physical machine from the source physical machine. According to the technical scheme of the embodiment of the invention, a hardware engineer in a complex information management system can independently transfer the virtual machines on the source physical machine to the destination physical machine without participation of a system administrator, thereby maintaining the hardware of the source physical machine. Thus, the invention can reduce the labor cost of maintaining the system hardware and can more quickly respond to the hardware faults of the system.
Description
Technical field
The present invention relates to computer realm, more particularly, relate to the device, the system and method that are used for managing virtual machines.
Background technology
Under virtualized environment, on each physical machine, provide a plurality of virtual machines by virtual level.Typical virtualization architecture as shown in Figure 1.Virtual level directly runs on the Physical layer.Provide 4 virtual machines by virtual level, on each virtual machine, moved different application respectively.Virtual machine is sightless for using.That is to say,, operate on the virtual machine and run directly on the physical machine just the same from application point of view.Virtual level manages physical resource, and the physical resource interface of " simulation " is provided to application.Because using " the physical resource interface " faced all is that virtual level simulates out, therefore when application deployment, need not considers actual physical resource details, thereby increase the dirigibility of application deployment greatly.
If desired the physical machine of carrying virtual machine is carried out hardware maintenance,, increase internal memory etc., just must stop the running of physical machine such as changing hard disk; Can not be out of service if require to use, just the virtual machine (vm) migration on the source physical machine that needs will be to be stopped is the target physical machine to another physical machine.The migration virtual machine belongs to system level operation, and hardware maintenance belongs to the hardware level operation.In large-scale information management system, system level operation is finished at system console by the system manager, and the hardware level operation is finished at machine room by the Hardware Engineer.System console and machine room may be in the physical location quite far away than the distance of large time difference.Perhaps can not enter machine room for the security consideration system manager can only enter system console, the Hardware Engineer can only enter machine room and can not enter system console.In these cases, the hardware maintenance flow process may comprise: the system manager carries out system level operation, and virtual machine is moved to the target physical machine from the source physical machine; The system manager notifies the Hardware Engineer can begin the source physical machine is safeguarded; The Hardware Engineer disconnects the power supply of source physical machine, carries out hardware maintenance; Hardware Engineer's reporting system slip-stick artist safeguards and finishes; The system engineer moves back the source physical machine with virtual machine from the target physical machine.This shows, must the system manager and the Hardware Engineer cooperate and just can finish once complete hardware maintenance flow process.This makes the human cost of hardware maintenance become big.In addition, especially, if between the residing physical location of control desk and machine room there is the bigger time difference, this hardware maintenance flow process may be with the time of sky note, and this has weakened the ability of system's solution of emergent event.
Summary of the invention
In view of this, the invention provides device, the system and method for managing virtual machines, thereby simplify the flow process of carrying out hardware maintenance under the virtualized environment.
The system that is used for managing virtual machines according to the embodiment of the invention comprises a field management device, this field management device is connected at least two physical machine by special-purpose physical electrical, wherein the virtual machine at least one physical machine need be moved at least one target physical machine, this device comprises: load module is used to receive outside input; Operational module is configured to determine the source physical machine according to the field external input by described load module, and further target physical machine, so that the work of control transferring module; And transferring module, be configured to virtual machine is moved to the target physical machine from the source physical machine.
According to the system of the another kind of managing virtual machines of the embodiment of the invention any one in blade server system and the rack-mount server system in particular, this system comprises at least two physical machine, and wherein the virtual machine at least one physical machine need be moved at least one target physical machine; With the device that is used for managing virtual machines that is connected at least two physical machine.This device comprises: load module is used to receive outside input; Operational module is configured to determine the source physical machine according to the field external input by described load module, and further determines the target physical machine, so that the work of control transferring module; And transferring module, be configured to virtual machine is moved to the target physical machine from the source physical machine.
According to the method for managing virtual machines in blade server system of the embodiment of the invention, described blade server system comprises at least two physical machine, and this method comprises: determine source physical machine and target physical machine; Be connected control described source physical machine by special-purpose physical electrical on and described target physical machine, thereby with the virtual machine (vm) migration on the physical machine of described source to described target physical machine.
Technical scheme according to the embodiment of the invention, in the information management system of complexity, the Hardware Engineer can be in machine room Zi the virtual machine (vm) migration on the source physical machine of being about to carry out hardware maintenance to the target physical machine, then to source physical machine outage that service externally is not provided so that carry out hardware maintenance.Whole process need not the system manager and participates in.Like this, can reduce the human cost of maintenance system hardware, can also be quickly the hardware problem of system be responded.Simultaneously,, and can not visit any data in the physical machine, more can not visit, thereby can not reduce the security of information management system by the packaged data of the virtual machine in the physical machine because the Hardware Engineer can only carry out virtual machine (vm) migration to physical machine.
Description of drawings
Fig. 1 is the synoptic diagram of typical virtualization architecture.
Fig. 2 (A) is the synoptic diagram of the device that is used for managing virtual machines according to the embodiment of the invention when being used for blade server system.
Fig. 2 (B) shows the outside drawing that comprises according to the blade server system of the field management device of the embodiment of the invention.
Fig. 2 (C) is the block diagram according to the device that is used for managing virtual machines of the embodiment of the invention.
Fig. 3 is the process flow diagram according to the method that is used for managing virtual machines of the embodiment of the invention.
Embodiment
Following with reference to the device of description of drawings managing virtual machines provided by the invention, the embodiment of system and method.In the following description, a physical machine is represented an independently computer system, such as each the blade main frame in the blade server system or each main frame in the rack-mount server system.The physical machine of some is installed in a blade chassis (chassis) or the frame (rack).It is emphasized that first element not only can directly link to each other with second element, but also can link to each other with second element indirectly by three element when first element is described to link to each other with second element.Further, for clear, omitted understanding some unnecessary elements of the present invention fully.
Can be positioned at the frame of the cabinet or the rack-mount server of blade server system according to the field management device that is used for managing virtual machines of the embodiment of the invention, management is installed on the virtual machine in each physical machine in this cabinet or on this frame.If some frames are formed a cluster, so described field management device also can be used as an independent device in the machine room, and it is connected to each physical machine in the cluster, manages the virtual machine in each physical machine in this cluster.
Described connection can be that special-purpose physical electrical connects.Described physical electrical connects can be independent of backboard and individualism.For example, can connect as physical electrical with serial communication line, USB (universal serial bus) or parallel communications circuit etc. each physical machine is connected to described field management device.Correspondingly, described interface can be serial transmission line interface, USB (universal serial bus) or parallel line interface.Especially, if this field management device is positioned on the cabinet of blade server system, physical electrical also can be set on the backboard of blade server system connects, and on backboard and blade main frame, the special purpose interface that matches each other is set.Like this, when each physical machine is installed in the cabinet, just can connect by this physical electrical that this interface is connected on the backboard.The field management device also is connected to this physical electrical by similar interface and connects, and each physical machine just is connected by this physical electrical with the field management device and couples together like this.Described physical electrical on the backboard connects any one the electrical standard that can adopt in serial communication line, USB (universal serial bus) and the parallel communications circuit and is provided with, and also can adopt any other electrical standard to be provided with.In this case, described field management device can be integrated on the backboard of blade server system, is for example realized by integrated circuit (IC) chip and peripheral module.Can adopt the electrical standard that is suitable for short haul connection that described special-purpose physical electrical is set connects, this be because the special-purpose physical electrical of realizing like this connect with and on institute's data carried by data connect fairly simple usually, be easy to realize, and be enough to satisfy the needs that the Hardware Engineer operates at the machine room scene.
As an alternative, also can each physical machine be connected to the field management device by general network line.This moment, physical machine and field management device only need comprise that general network interface card gets final product.Again, for blade server system, described universal network circuit is preferably located in the cabinet inside of blade server system, for example is positioned on the backboard of this blade server system.For the rack-mount server system, described universal network circuit also is preferably located in the frame inside of this rack-mount server device system.
Obviously, described field management device must be connected at least two physical machine.It will be understood by those skilled in the art that and describedly be connected at least two physical machine and do not represent to be connected to simultaneously at least two physical machine.
Synoptic diagram when Fig. 2 (A) shows field management device according to the embodiment of the invention and is used for blade server system.
Fig. 2 (B) shows the outside drawing that comprises according to the blade server system of the field management device of the embodiment of the invention.
Fig. 2 (C) shows the block scheme according to the field management device 200 of the embodiment of the invention, and this device comprises acquisition module 201, operational module 202, indicating module 203, transferring module 204 and load module 205.
Acquisition module 201 is used to obtain state parameter relevant with virtual machine on the physical machine that is connected.What virtual machines described state parameter for example has on this physical machine, and how many current load factors of this physical machine is, each virtual machine has distributed how many physical resources or the like.
As mentioned above, described field management device 200 is connected to each physical machine, and that ways of connecting has is multiple, thus acquisition module 201 can by multiple means from physical machine obtain with this physical machine on virtual machine relevant state parameter.Those skilled in the art are after definite physical electrical that above any one connected mode is arrived as described field management device between described each physical machine connects, can design the communication protocol that satisfies different needs at an easy rate, realize that the data between field management device and the physical machine connect.
In general, the virtual level on the physical machine provides application service to call so that set up data with physical machine and be connected for external device (ED).After having set up the data connection, the field management device is equivalent to terminal, and is equivalent to server on the physical machine.A kind of the most frequently used application service be exactly by the universal network circuit of forming by network interface card and netting twine etc. provide with external device (ED) between data be connected., the IP address of each physical machine of being connected can be left in this device in advance by under netting twine and the situation that physical machine links to each other at this device.Corresponding to each IP address,, can further deposit user name corresponding, password and port numbers etc. promptly corresponding to every physical machine.Like this, thus this field management device just can call this application service by IP address, user name, password and port numbers to be set up data and connects.The field management device utilizes these data to connect via netting twine and sends the order of inquiring about described state parameter to physical machine, and the virtual level on the physical machine receives this order by network interface card, then via netting twine described state parameter is sent to field management device 200 once more.
Again for example, the circuit of this device by special use is connected to the special purpose interface on the physical machine, connect the order that sends the described state parameter of inquiry to physical machine via special-purpose physical electrical, virtual level on the physical machine receives this order by this special purpose interface, then connects via this special use physical electrical once more described state parameter is sent to field management device 200.Especially, under the situation that adopts serial communication line to connect, can set up data by Telnet (telnet) between described field management device and the physical machine and connect as physical electrical.This be because, the general physical machine all disposes control card, this control card comprises serial ports.Correspondingly, the virtual level on the physical machine provides the application service of Telnet by the serial ports on this control card.The field management device is equivalent to the local operation physical machine in this physical machine after signing in on this physical machine by Telnet, and nature can obtain the described state parameter on this physical machine.Because the communication distance of serial communication line is restricted, therefore under the situation that adopts serial communication line to connect as physical electrical, described field management device preferably only is connected to each physical machine of blade server system inside or each physical machine of rack-mount server internal system.
For connecting with other physical electricals, for example the special physical electrical that is provided with connects on USB (universal serial bus), parallel communications circuit or the blade server system backboard, the situation that physical machine and described field management device are coupled together, virtual level need in the virtual level of physical machine, add the corresponding driving program, so that can respond and handle order or the data of receiving by the interface of correspondence.Those skilled in the art can design described driver at an easy rate, therefore do not repeat them here.
Acquisition module 201 can obtain the state parameter of physical machine termly, also can be according to the described state parameter that physical machine is obtained in instruction that obtains that receives from operational module 202.In general, can obtain the state parameter of all physical machine that field management device 200 connected; Specify under the situation of physical machine in described order format support of obtaining instruction, also can obtain the state parameter that a part of physical machine is obtained in instruction according to described.
The state parameter that described acquisition module 201 is obtained sends to operational module 202.
Operational module 202 is used for the work according to described state parameter control indicating module, and definite source physical machine and target physical machine are with the work of control transferring module.
Operational module 202 is determined the source physical machine based on scene input, described field external input be the Hardware Engineer in machine room by being positioned at the input of the load module 205 on this field management crust of the device.The input interface that any type can be provided is as described load module 205, and for example mouse, keyboard, touch-screen etc. are so that receive Hardware Engineer's input.As an alternative, if described field management device is implemented as chip and peripheral module on the blade server system backboard, then described shell refers to the cabinet of blade server system, and load module is positioned on the cabinet of blade server system as one of peripheral module.
In one embodiment, receive the appointment of Hardware Engineer to source physical machine and target physical machine by operational module 202, then operational module 202 control indicating modules 203 show described state parameter so that the Hardware Engineer can be according to described state parameter decision target physical machine; Operational module 202 further receives the appointment to the target physical machine.After having determined source physical machine and target physical machine, operational module 202 sends the migration instruction to transferring module 204, and described migration instruction comprises source physical machine sign, virtual machine sign and the target physical machine sign corresponding with this virtual machine.Need to prove, can be at all virtual machines on the physical machine of source to the appointment of target physical machine, and this in particular cases described migration instruction can only comprise that source physical machine sign and target physical machine identify.
In another embodiment, the Hardware Engineer is the assigned source physical machine only, and field management device 200 is decided the target physical machine in its sole discretion.Operational module 202 determines the target physical machine according to described state parameter, and sends the migration instruction that comprises that source physical machine sign, virtual machine sign and the target physical machine corresponding with this virtual machine identify to transferring module 204.Equally, the target physical machine that operational module 202 is determined may be all identical to all virtual machines on the physical machine of source, and this in particular cases described migration instruction can only comprise source physical machine sign and target physical machine sign.
Need to prove that no matter described field management device is set up data by which kind of mode and physical machine is connected, the Hardware Engineer only can carry out assigned source physical machine and/or target physical machine by operational module, and can not carry out other operations.This is because consider that from the angle of data security the Hardware Engineer should be able to be by the data on the described field management device visit physical machine.This can only accept appointment to source physical machine and/or target physical machine by operational module 204 by adopting the order filtering technique, does not realize and do not accept other any orders.
Indicating module 203, whether the virtual machine that is used on indication source physical machine under the control of operational module 202 all moves.
Specified by the Hardware Engineer among the embodiment of target physical machine, described indicating module 203 shows the state parameter that acquisition module 201 is obtained.As mentioned above, state parameter comprises for what virtual machines on the physical machine of source, therefore just can indicate the virtual machine on the physical machine of source whether all to move to other physical machine naturally by the show state parameter.In the present embodiment, indicating module 203 can comprise the display screen of fritter, how be used for showing each physical machine state parameter relevant that is connected, so that the Hardware Engineer can arrive the target physical machine with the virtual machine (vm) migration on the physical machine of source according to these state parameter decisions with virtual machine.This display screen is controlled according to described state parameter by operational module 202.
Certainly, for further for simplicity, can not provide indicating module.The Hardware Engineer is rule of thumb waiting for that long enough after the time cuts off the power supply this physical machine so that carry out hardware maintenance.At this moment, if by Hardware Engineer's assigned source physical machine and target physical machine, can further omit acquisition module so.As to the substituting of described indicating module, can increase automatic power-off modular, the mode of operational module 202 these automatic power-off modulars of control is similar with the mode of the above-mentioned indicator of control.
Indicating module is positioned on the shell of described field management device.As an alternative, if described field management device is implemented as chip and peripheral module on the blade server system backboard, then described shell refers to the cabinet of blade server system, and indicating module is positioned on the cabinet of blade server system as one of peripheral module.
Transferring module 204 is used under the control of operational module 202 virtual machine being moved to the target physical machine from the source physical machine.
As mentioned above, field management device 200 is connected to each physical machine by universal network circuit or special-purpose physical electrical, transferring module 204 connects by this universal network circuit or special-purpose physical electrical, communicate by letter with the virtual level on the target physical machine with the source physical machine respectively, thereby finish the migration of virtual machine.When migration is finished thereby the advantage of this implementation method is the transition process grasp on top of of field management device; Shortcoming is to need the field management device that more intense processing power is arranged.
In one embodiment, can communicate with one another between the virtual level on the physical machine and finish virtual machine (vm) migration voluntarily.In this case, transferring module 204 is instructed according to described migration, and the sign of target physical machine is sent to the source physical machine, by the virtual level of the source physical machine beginning virtual machine (vm) migration of directly communicating by letter with the target physical machine.The advantage of this implementation method is that the field management device only is responsible for starting migration, and is lower to the requirement of processing power; Shortcoming be the field management device need by to described state parameter obtain determine whether migration is finished.
No matter be above which kind of situation, because this migration only relates to virtual level, so the application on each virtual machine can not find to have carried out virtual machine (vm) migration, thereby keeps continuous operation.Exchanges data between source physical machine and the target physical machine can be undertaken by above-mentioned special-purpose physical electrical connection or universal network circuit.
Except with the upper module, described field management device 200 can also possess authentication module, and this module is configured to verify the current operator virtual machine (vm) migration of whether having the right to carry out.As mentioned above, because field management device 200 is positioned at machine room, and machine room itself has often had corresponding demo plant, so field management device 200 can verify once more, thereby omits described authentication module.
Fig. 3 is the process flow diagram according to the method that is used for managing virtual machines of the embodiment of the invention.
Before step 301, may further include the current operator of checking and whether have the right to carry out the step of virtual machine (vm) migration, only in the checking result when being, just carry out step 301.
Can determine target physical machine sign to the appointment of target physical machine by receiving, also can be to determine the target physical machine according to described state parameter.Below describe the process of determining the target physical machine according to described state parameter in detail.
At first from all physical machine that the field management device is managed, select a part of physical machine as candidate's target physical machine in other physical machine except the physical machine of source.For example, management devices is positioned under the situation on the frame at the scene, selects a part as candidate's target physical machine in other physical machine from frame except the physical machine of source.Why to carry out the selection of candidate's target physical machine earlier, be because the target physical machine needs bigger calculating of consumption rate and storage resources when sink virtual machine, if the present load rate of a physical machine is too high, then be not suitable as the target physical machine on the principle.Can judge whether the present load rate of certain physical machine is lower than first threshold according to the state parameter that is obtained in the step 302.If the present load rate of certain physical machine is lower than first threshold, then with this physical machine as candidate's target physical machine.But because the physical machine load factor changes along with the time, so the present load rate is not to select the determinative of target physical machine.Under the less situation of the management devices physical machine of managing, can consider current physical machine load factor at the scene, other physical machine except that the physical machine of source are candidate's target physical machine in other words, and promptly this step is omissible.
After having determined candidate's target physical machine,, judge whether any candidate's target physical machine can provide abundant resource by any one virtual machine on the physical machine of source according to the state parameter that is obtained in the step 302.As mentioned above, state parameter comprises to virtual machine having distributed how many hardware resources.The field management device can determine to have distributed how many hardware resources for each virtual machine to be migrated on the physical machine of source by the state parameter from the source physical machine; The field management device can also determine how many hardware resources the virtual machine that has existed on current candidate's target physical machine has taken by the state parameter of certain candidate's target physical machine, thereby determines whether have abundant residue hardware resource to distribute to current virtual machine to be migrated on this candidate's target physical machine.If this candidate's target physical machine can provide enough hardware resources to this virtual machine, then with this candidate's target physical machine as the actual purpose physical machine, with this virtual machine (vm) migration to this target physical machine.
Under the bigger situation of candidate physical machine quantity, the field management device can take different strategies to optimize the migration of virtual machine.Such as, take all factors into consideration each virtual machine to be migrated and require occupied resource on the resource that takies and each candidate's target physical machine, allow migration finish equilibrium of resource occupation ratio on each target physical machine of back.Again such as, at first select candidate's target physical machine of occupied resource ratio minimum as the actual purpose physical machine, and migration virtual machine as much as possible is not enough distributed on the physical machine of source till any one remaining virtual machine up to remaining hardware resource on this target physical machine.
Though illustrated and described some exemplary embodiments of the present invention, but it will be understood by those skilled in the art that, under the prerequisite that does not depart from principle of the present invention and spirit, can change these embodiments, scope of the present invention is limited by claims and equivalence transformation thereof.
Claims (20)
1. a device that is used for managing virtual machines is connected at least two physical machine by special-purpose physical electrical, and wherein the virtual machine at least one physical machine need be moved at least one target physical machine, and this device comprises:
Load module is used to receive outside input;
Operational module is configured to determine the source physical machine according to the field external input by described load module, and further determines the target physical machine, so that the work of control transferring module; With
Transferring module is configured to virtual machine is moved to the target physical machine from the source physical machine.
2. device according to claim 1, wherein said operational module are configured to determine the target physical machine according to the field external input by described load module.
3. device according to claim 1 further comprises:
Acquisition module is configured to obtain state parameter relevant with virtual machine on the physical machine that is connected;
Wherein said operational module is configured to determine the target physical machine according to described state parameter.
4. device according to claim 3 further comprises:
Be positioned at the indicating module on the described crust of the device, be configured to indicate the virtual machine on the physical machine of source whether all to move.
5. device according to claim 4, wherein:
Described indicating module further is configured to show described state parameter.
6. device according to claim 3 further comprises:
Automatically power-off modular is configured to all under the situation of migration the source physical machine be cut off the power supply at virtual machine.
7. device according to claim 1, wherein said special-purpose physical electrical are connected to the connection of adopting the electrical standard setting that is suitable for short haul connection.
8. according to claim 1 or 7 described devices, wherein said special-purpose physical electrical is connected to serial communication line.
9. the system of a managing virtual machines comprises:
At least two physical machine;
As any described device that is used for managing virtual machines in the claim 1 to 8.
10. system according to claim 9, wherein this system is a blade server system, the described device that is used for managing virtual machines is chip and the peripheral module that is positioned on the backboard of described blade server system.
11. system according to claim 10, wherein said special-purpose physical electrical is connected on the described backboard.
12. the system of a managing virtual machines, this system are in blade server system and the rack-mount server system any one, this system comprises:
At least two physical machine, wherein the virtual machine at least one physical machine need be moved at least one target physical machine; With
Be connected to the device that is used for managing virtual machines of at least two physical machine, this device comprises:
Load module is used to receive outside input;
Operational module is configured to determine the source physical machine according to the field external input by described load module, and further determines the target physical machine, so that the work of control transferring module; With
Transferring module is configured to virtual machine is moved to the target physical machine from the source physical machine.
13. the method for a managing virtual machines in comprising the system of at least two physical machine, this method comprises:
Determine source physical machine and target physical machine;
Connect control described source physical machine and described target physical machine by special-purpose physical electrical, thus with the virtual machine (vm) migration on the physical machine of described source to described target physical machine.
14. method according to claim 13 determines that wherein the step of source physical machine and target physical machine comprises:
By receiving source physical machine and target physical machine are determined in the appointment of target physical machine.
15. method according to claim 13 determines that wherein the step of source physical machine and target physical machine comprises:
By receiving the source physical machine is determined in the appointment of source physical machine; With
Obtain state parameter relevant on each physical machine by described special-purpose physical electrical connection, and determine the target physical machine according to described state parameter with virtual machine.
16. method according to claim 15 wherein determines that according to described state parameter the step of target physical machine comprises:
According to described state parameter, judge whether any candidate's target physical machine can provide abundant resource by any one virtual machine on the physical machine of source; With
In response to described judged result for being, with this candidate's target physical machine as the target physical machine.
17. method according to claim 16 wherein before described determining step, further comprises:
Select the present load rate to be lower than the physical machine of first threshold as candidate's target physical machine.
18. method according to claim 13, wherein said system is a blade server system, and the described step that connects control described source physical machine and described target physical machine by described special-purpose physical electrical comprises:
Connect control described source physical machine and described target physical machine by the special-purpose physical electrical on the blade server backboard.
19. according to claim 13 or 18 described methods, wherein the step that connects control described source physical machine and described target physical machine by described special-purpose physical electrical comprises:
The special-purpose physical electrical that is suitable for the electrical standard setting of short haul connection by employing connects control described source physical machine and described target physical machine.
20. according to claim 13 or 18 described methods, wherein the step that connects control described source physical machine and described target physical machine by described special-purpose physical electrical comprises:
Control described source physical machine and described target physical machine by serial communication line.
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| CN103077079A (en) * | 2012-12-28 | 2013-05-01 | 华为技术有限公司 | Method and device for controlling migration of virtual machine |
| CN103917966A (en) * | 2011-12-23 | 2014-07-09 | 英派尔科技开发有限公司 | Optimization of resource utilization in a collection of devices |
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