Teachings of this application include a computing network that may include multiple different data centers and/or server grids which are deployed in different geographic locations. In at least one embodiment, at least some of the server grids may be operable to provide on-demand, grid and/or utility
Teachings of this application include a computing network that may include multiple different data centers and/or server grids which are deployed in different geographic locations. In at least one embodiment, at least some of the server grids may be operable to provide on-demand, grid and/or utility computing resources for hosting various types of distributed applications. In at least one embodiment, a distributed application may be characterized as an application made up of distinct components (e.g., virtual appliances, virtual machines, virtual interfaces, virtual volumes, virtual network connections, etc.) in separate runtime environments. In at least one embodiment, different ones of the distinct components of the distributed application may be hosted or deployed on different platforms (e.g., different servers) connected via a network. In some embodiments, a distributed application may be characterized as an application that runs on two or more networked computers.
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1. A method for migrating a virtual appliance from a first server grid to a second server grid via a communication network, the method comprising: running a first instance of the virtual appliance at the first server grid, wherein the first server grid has associated therewith a first portion of vir
1. A method for migrating a virtual appliance from a first server grid to a second server grid via a communication network, the method comprising: running a first instance of the virtual appliance at the first server grid, wherein the first server grid has associated therewith a first portion of virtualized computing resources representing computing resources associated with a first plurality of physical servers, wherein the first instance of the virtual appliance has associated therewith a first instance of a virtual machine and a first instance of a virtual volume;identifying a first portion of updated or modified data relating to a first disk image stored at the first instance of the virtual volume, for use by the first instance of the virtual appliance;establishing a connection over the communication network from the first server grid to the second server grid;transferring, to the second server grid, information relating to the first portion of updated or modified data relating to the first disk image;modifying, using the first portion of updated or modified data, a second disk image for use by a second instance of the virtual appliance at the second server grid; andstarting, using the modified second disk image, the second instance of the virtual appliance at the second server grid;wherein the second instance of the virtual appliance includes a second instance of the virtual machine and a second instance of the virtual volume. 2. The method of claim 1 wherein the first instance of the virtual appliance has associated therewith current virtual appliance state information representing a current state of the first instance of the virtual appliance as of a specific time T, the method further comprising: storing the first disk image at the first instance of the virtual volume; andstarting, using the modified second disk image, the second instance of the virtual appliance at the second server grid at a first state corresponding to the current state of the first instance of the virtual appliance as of the specific time T. 3. The method of claim 1 wherein the first instance of the virtual appliance has associated therewith current virtual appliance state information representing a current state of the first instance of the virtual appliance as of a specific time T, wherein the first instance of the virtual appliance includes a first virtual machine having associated therewith current virtual appliance state information representing a current state of the first instance of the virtual appliance as of a specific time T the method further comprising: starting, using the modified second disk image, the second instance of the virtual appliance at the second server grid at a first state corresponding to the current state of the first instance of the virtual appliance as of the specific time T;wherein the starting of the second instance of the virtual appliance at the second server grid includes starting, at the second server grid, an instance of the first virtual machine at a state corresponding to the current state of the first virtual machine as of the specific time T. 4. A method for migrating a virtual appliance from a first server grid to a second server grid via a communication network, the method comprising: running a first instance of the virtual appliance at the first server grid, wherein the first server grid has associated therewith a first portion of virtualized computing resources representing computing resources associated with a first plurality of physical servers, wherein the first instance of the virtual appliance has associated therewith a first instance of a virtual machine and a first instance of a virtual volume;establishing a connection over the communication network from the first server grid to the second server grid;transferring, to the second server grid, first virtual appliance information relating to the first instance of the virtual appliance, wherein the first virtual appliance information includes virtual appliance descriptor information and virtual appliance configuration information;starting, using the first virtual appliance information, the second instance of the virtual appliance at the second server grid; andwherein the second instance of the virtual appliance includes a second instance of the virtual machine. 5. The method of claim 1: wherein the first instance of the virtual appliance has associated therewith current virtual appliance state information representing a current state of the first instance of the virtual appliance as of a specific time T;wherein said identifying further comprises identifying, while the first instance of the virtual appliance is running on the first server grid, the first portion of updated or modified data relating to the first disk image;wherein said transferring further comprises transferring, to the second server grid while the first instance of the virtual appliance is running at the first server grid, the first disk image;wherein said modifying further comprises modifying, using the first disk image transferred to the second server grid and using the first portion of updated or modified data, the second disk image to thereby generate the modified second disk image; andwherein said starting further comprises starting, using the modified second disk image, the second instance of the virtual appliance at the second server grid at a first state corresponding to the current state of the first instance of the virtual appliance as of the specific time T. 6. The method of claim 1 further comprising: identifying a first geographic location where the first server grid is deployed; andidentifying a second geographic location where the second server grid is deployed;wherein the second geographic location is different than the first geographic location. 7. A system for migrating a virtual appliance from a first server grid of computer network to a second server grid of the computer network, the system comprising: at least one processor;at least one interface operable to provide a communication link to at least one network device; andmemory;the system being operable to:run a first instance of the virtual appliance at the first server grid, wherein the first server grid has associated therewith a first portion of virtualized computing resources representing computing resources associated with a first plurality of physical servers, wherein the first instance of the virtual appliance has associated therewith a first instance of a virtual machine and a first instance of a virtual volume;store, at the first instance of the virtual volume, a first disk image for use by the first instance of the virtual appliance;identify a first portion of updated or modified data relating to the first disk image;establish a connection over the communication network from the first server grid to the second server grid;transfer, to the second server grid, information relating to the first portion of updated or modified data relating to the first disk image;modify, using the first portion of updated or modified data, a second disk image for use by a second instance of the virtual appliance at the second server grid; andstart, using the modified second disk image, the second instance of the virtual appliance at the second server grid; wherein the second instance of the virtual appliance includes a second instance of the virtual machine and a second instance of the virtual volume. 8. The system of claim 7 wherein the first instance of the virtual appliance has associated therewith current virtual appliance state information representing a current state of the first instance of the virtual appliance as of a specific time T, the system being further operable to: start, using the modified second disk image, the second instance of the virtual appliance at the second server grid at a first state corresponding to the current state of the first instance of the virtual appliance as of the specific time T. 9. The system of claim 7 wherein the first instance of the virtual appliance has associated therewith current virtual appliance state information representing a current state of the first instance of the virtual appliance as of a specific time T, wherein the first instance of the virtual appliance includes a first virtual machine having associated therewith current virtual machine state information representing a current state of the first virtual machine as of the specific time T, the system being further operable to: start, using the modified second disk image, the second instance of the virtual appliance at the second server grid at a first state corresponding to the current state of the first instance of the virtual appliance as of the specific time T; andstart, at the second server grid, an instance of the first virtual machine at a state corresponding to the current state of the first virtual machine as of the specific time T. 10. A system for migrating a virtual appliance from a first server grid to a second server grid via a communication network, the system comprising: at least one processor;at least one interface operable to provide a communication link to at least one network device; andmemory;the system being operable to:run a first instance of the virtual appliance at the first server grid, wherein the first server grid has associated therewith a first portion of virtualized computing resources representing computing resources associated with a first plurality of physical servers, wherein the first instance of the virtual appliance has associated therewith a first instance of a virtual machine and a first instance of a virtual volume;store, at the first instance of the virtual volume, a first disk image for use by the first instance of the virtual appliance;establish a connection over the communication network from the first server grid to the second server grid;transfer, to the second server grid, first virtual appliance information relating to the first instance of the virtual appliance, wherein the first virtual appliance information includes virtual appliance descriptor information and virtual appliance configuration information; andstart, using the first virtual appliance information, the second instance of the virtual appliance at the second server grid;wherein the second instance of the virtual appliance includes a second instance of the virtual machine. 11. The system of claim 10: wherein the first instance of the virtual appliance has associated therewith current virtual appliance state information representing a current state of the first instance of the virtual appliance as of a specific time T;wherein said detecting further comprises detecting, while the first instance of the virtual appliance is running on the first server grid, the first portion of updated or modified data relating to the first disk image;wherein said transferring further comprises transferring, to the second server grid while the first instance of the virtual appliance is running at the first server grid, the first disk image;wherein said modifying further comprises modifying, using the first disk image transferred to the second server grid and using the first portion of updated or modified data, the second disk image to thereby generate the modified second disk image; andwherein said starting further comprises starting, using the modified second disk image, the second instance of the virtual appliance at the second server grid at a first state corresponding to the current state of the first instance of the virtual appliance as of the specific time T. 12. The system of claim 10 being further operable to: identify a first geographic location where the first server grid is deployed; andidentify a second geographic location where the second server grid is deployed;wherein the second geographic location is different than the first geographic location. 13. A method for migrating a distributed application from a first server grid to a second server grid via a communication network, the method comprising: running a first instance of the distributed application at the first server grid, wherein the first server grid has associated therewith a first portion of virtualized computing resources representing computing resources associated with a first plurality of physical servers, wherein the first instance of the distributed application has associated therewith a first instance of a virtual machine and a first instance of a virtual volume;storing, at the first instance of the virtual volume, a first disk image for use by the first instance of the distributed application;identifying a first portion of updated or modified data relating to the first disk image;establishing a connection over the communication network from the first server grid to the second server grid;transferring, to the second server grid, information relating to the first portion of updated or modified data relating to the first disk image;modifying, using the first portion of updated or modified data, a second disk image for use by a second instance of the distributed application at the second server grid; andstarting, using the modified second disk image, the second instance of the distributed application at the second server grid;wherein the second instance of the distributed application includes a second instance of the virtual machine and a second instance of the virtual volume. 14. The method of claim 13 wherein the first instance of the distributed application has associated therewith current distributed application state information representing a current state of the first instance of the distributed application as of a specific time T, the method further comprising: starting, using the modified second disk image, the second instance of the distributed application at the second server grid at a first state corresponding to the current state of the first instance of the distributed application as of the specific time T. 15. The method of claim 13 wherein the first instance of the distributed application has associated therewith current distributed application state information representing a current state of the first instance of the distributed application as of a specific time T, wherein the first instance of the distributed application includes a first virtual machine having associated therewith current distributed application state information representing a current state of the first instance of the distributed application as of a specific time T the method further comprising: starting, using the modified second disk image, the second instance of the distributed application at the second server grid at a first state corresponding to the current state of the first instance of the distributed application as of the specific time T;wherein the starting of the second instance of the distributed application at the second server grid includes starting, at the second server grid, an instance of the first virtual machine at a state corresponding to the current state of the first virtual machine as of the specific time T. 16. A method for migrating a distributed application from a first server grid to a second server grid via a communication network, the method comprising: running a first instance of the distributed application at the first server grid, wherein the first server grid has associated therewith a first portion of virtualized computing resources representing computing resources associated with a first plurality of physical servers, wherein the first instance of the distributed application has associated therewith a first instance of a virtual machine and a first instance of a virtual volume;establishing a connection over the communication network from the first server grid to the second server grid;transferring, to the second server grid, first distributed application information relating to the first instance of the distributed application, wherein the first distributed application information includes distributed application descriptor information and distributed application configuration information;starting, using the first distributed application information, the second instance of the distributed application at the second server grid; andwherein the second instance of the distributed application includes a second instance of the virtual machine. 17. The method of claim 16: wherein the first instance of the distributed application has associated therewith current distributed application state information representing a current state of the first instance of the distributed application as of a specific time T;wherein said detecting further comprises detecting, while the first instance of the distributed application is running on the first server grid, the first portion of updated or modified data relating to the first disk image;wherein said transferring further comprises transferring, to the second server grid while the first instance of the distributed application is running at the first server grid, the first disk image;wherein said modifying further comprises modifying, using the first disk image transferred to the second server grid and using the first portion of updated or modified data, the second disk image to thereby generate the modified second disk image; andwherein said starting further comprises starting, using the modified second disk image, the second instance of the distributed application at the second server grid at a first state corresponding to the current state of the first instance of the distributed application as of the specific time T. 18. The method of claim 16 further comprising: identifying a first geographic location where the first server grid is deployed; andidentifying a second geographic location where the second server grid is deployed;wherein the second geographic location is different than the first geographic location. 19. A system for migrating a distributed application from a first server grid of computer network to a second server grid of the computer network, the system comprising: at least one processor;at least one interface operable to provide a communication link to at least one network device; andmemory;the system being operable to:run a first instance of the distributed application at the first server grid, wherein the first server grid has associated therewith a first portion of virtualized computing resources representing computing resources associated with a first plurality of physical servers, wherein the first instance of the distributed application has associated therewith a first instance of a virtual machine and a first instance of a virtual volume;store, at the first instance of the virtual volume, a first disk image for use by the first instance of the distributed application;identify a first portion of updated or modified data relating to the first disk image;establish a connection over the communication network from the first server grid to the second server grid;transfer, to the second server grid, information relating to the first portion of updated or modified data relating to the first disk image;modify, using the first portion of updated or modified data, a second disk image for use by a second instance of the distributed application at the second server grid; andstart, using the modified second disk image, the second instance of the distributed application at the second server grid;wherein the second instance of the distributed application includes a second instance of the virtual machine and a second instance of the virtual volume. 20. The system of claim 19 wherein the first instance of the distributed application has associated therewith current distributed application state information representing a current state of the first instance of the distributed application as of a specific time T, the system being further operable to: start, using the modified second disk image, the second instance of the distributed application at the second server grid at a first state corresponding to the current state of the first instance of the distributed application as of the specific time T. 21. The system of claim 19 wherein the first instance of the distributed application has associated therewith current distributed application state information representing a current state of the first instance of the distributed application as of a specific time T, wherein the first instance of the distributed application includes a first virtual machine having associated therewith current virtual machine state information representing a current state of the first virtual machine as of the specific time T, the system being further operable to: start, using the modified second disk image, the second instance of the distributed application at the second server grid at a first state corresponding to the current state of the first instance of the distributed application as of the specific time T; andstart, at the second server grid, an instance of the first virtual machine at a state corresponding to the current state of the first virtual machine as of the specific time T. 22. A system for migrating a distributed application from a first server grid to a second server grid via a communication network, the system comprising: at least one processor;at least one interface operable to provide a communication link to at least one network device; andmemory;run a first instance of the distributed application at the first server grid, wherein the first server grid has associated therewith a first portion of virtualized computing resources representing computing resources associated with a first plurality of physical servers, wherein the first instance of the distributed application has associated therewith a first instance of a virtual machine and a first instance of a virtual volume;store, at the first instance of the virtual volume, a first disk image for use by the first instance of the distributed application;establish a connection over the communication network from the first server grid to the second server grid;transfer, to the second server grid, first distributed application information relating to the first instance of the distributed application, wherein the first distributed application information includes distributed application descriptor information and distributed application configuration information; andstart, using the first distributed application information, the second instance of the distributed application at the second server grid;wherein the second instance of the distributed application includes a second instance of the virtual machine. 23. The system of claim 22: wherein the first instance of the distributed application has associated therewith current distributed application state information representing a current state of the first instance of the distributed application as of a specific time T;wherein said detecting further comprises detecting, while the first instance of the distributed application is running on the first server grid, the first portion of updated or modified data relating to the first disk image;wherein said transferring further comprises transferring, to the second server grid while the first instance of the distributed application is running at the first server grid, the first disk image;wherein said modifying further comprises modifying, using the first disk image transferred to the second server grid and using the first portion of updated or modified data, the second disk image to thereby generate the modified second disk image; andwherein said starting further comprises starting, using the modified second disk image, the second instance of the distributed application at the second server grid at a first state corresponding to the current state of the first instance of the distributed application as of the specific time T. 24. The system of claim 22 being further operable to: identify a first geographic location where the first server grid is deployed; andidentify a second geographic location where the second server grid is deployed;wherein the second geographic location is different than the first geographic location. 25. A method for migrating a first distributed application from a first server grid to a second server grid via a communication network, the first distributed application comprising a plurality of virtual appliances described in a first distributed application descriptor and a first storage volume, the method comprising: transferring at least a portion of contents of the first distributed application descriptor from the first server grid to the second server grid; andtransferring at least a portion of contents of the first storage volume from the first server grid to the second server grid; andwherein the first distributed application descriptor further includes a plurality of identifiers of virtual appliances that comprise the first distributed application. 26. The method of claim 25 further comprising: identifying a first geographic location where the first server grid is deployed; andidentifying a second geographic location where the second server grid is deployed;wherein the second geographic location is different than the first geographic location. 27. The method of claim 25, wherein the first distributed application descriptor further defines at least one connection between a first virtual appliance and a second virtual appliance. 28. The method of claim 25, wherein the first distributed application descriptor further defines the value for at least one configuration parameter of a first virtual appliance. 29. The method of claim 25, wherein the first distributed application descriptor identifies at least a first class of a virtual appliance to be used to instantiate a first instance of a virtual appliance. 30. The method of claim 25, wherein the first distributed application descriptor further includes a plurality of identifiers of virtual machines that comprise the first distributed application. 31. The method of claim 30, wherein the first distributed application descriptor further defines at least one connection between a first virtual machine and a second virtual machine. 32. The method of claim 30, wherein the first distributed application descriptor further defines the value for at least one configuration parameter of a first virtual machine. 33. The method of claim 30, wherein the first distributed application descriptor identifies at least a first class of a virtual machine to be used to instantiate a first instance of a virtual machine. 34. A system for migrating a first distributed application from a first server grid to a second server grid via a communication network, the first distributed application comprising a plurality of virtual appliances described in a first distributed application descriptor and a first storage volume, the system comprising: at least one processor;at least one interface operable to provide a communication link to at least one network device; andmemory;the system being operable to:transfer at least a portion of contents of the first distributed application descriptor from the first server grid to the second server grid; andtransfer at least a portion of contents of the first storage volume from the first server grid to the second server grid; andwherein the first distributed application descriptor further includes a plurality of identifiers of virtual appliances that comprise the first distributed application. 35. The system of claim 34 being further operable to: identify a first geographic location where the first server grid is deployed; andidentify a second geographic location where the second server grid is deployed;wherein the second geographic location is different than the first geographic location. 36. The system of claim 34, wherein the first distributed application descriptor further defines at least one connection between a first virtual appliance and a second virtual appliance. 37. The system of claim 34, wherein the first distributed application descriptor further defines the value for at least one configuration parameter of a first virtual appliance. 38. The system of claim 34, wherein the first distributed application descriptor identifies at least a first class of a virtual appliance to be used to instantiate a first instance of a virtual appliance. 39. The system of claim 34, wherein the first distributed application descriptor further includes a plurality of identifiers of virtual machines that comprise the first distributed application. 40. The system of claim 39, wherein the first distributed application descriptor further defines at least one connection between a first virtual machine and a second virtual machine. 41. The system of claim 39, wherein the first distributed application descriptor further defines the value for at least one configuration parameter of a first virtual machine. 42. The system of claim 39, wherein the first distributed application descriptor identifies at least a first class of a virtual machine to be used to instantiate a first instance of a virtual machine.
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