XAPI VM Migration: Difference between revisions
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Note: this description has been out of date for a while. To see how migration works, it is best to read the code starting from here: https://github.com/xapi-project/xen-api/blob/a232a3db5e51bf21eed2680386e4de79dcf4c70e/ocaml/xapi/message_forwarding.ml#L1638 |
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<!-- WikiMedia name: XAPI VM Migration --> |
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<!-- Original date: Wed Jul 13 13:05:57 2011 (1310562357000000) --> |
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__NOTOC__ |
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== XAPI VM Migration == |
== XAPI VM Migration == |
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Here's an overview of how xapi does migration of VMs. The code can be found in '''api.hg/ocaml/xapi/xapi_vm_migrate.ml'''. |
Here's an overview of how xapi does migration of VMs. The code can be found in '''api.hg/ocaml/xapi/xapi_vm_migrate.ml'''. |
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! '''Receiver''' |
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| attach the VDIs |
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| create the domain |
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| restore the devices (unless we must delay until after VDI activation) |
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| send handshake to transmitter |
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| '''''Synchronisation point 1''''' |
| '''''Synchronisation point 1''''' |
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| restore the domain, deserialising it from the transmitter |
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| '''''Synchronisation point 2''''' |
| '''''Synchronisation point 2''''' |
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| receive handshake from transmitter |
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| '''''Synchronisation point 3''''' |
| '''''Synchronisation point 3''''' |
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| activate VDIs (unless it's a localhost migrate) |
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| restore the devices (unless done already) |
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| unpause the domain |
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| plug PCI devices |
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| send handshake to transmitter |
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| '''''Synchronisation point 4''''' |
| '''''Synchronisation point 4''''' |
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[[Category:XAPI Devel]] |
[[Category:XAPI Devel]] |
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[[Category:Design Document]] |
[[Category:Design Document]] |
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[[Category:Developers]] |
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Latest revision as of 21:21, 20 January 2015
Note: this description has been out of date for a while. To see how migration works, it is best to read the code starting from here: https://github.com/xapi-project/xen-api/blob/a232a3db5e51bf21eed2680386e4de79dcf4c70e/ocaml/xapi/message_forwarding.ml#L1638
XAPI VM Migration
Here's an overview of how xapi does migration of VMs. The code can be found in api.hg/ocaml/xapi/xapi_vm_migrate.ml.
| Receiver |
|---|
| attach the VDIs |
| create the domain |
| restore the devices (unless we must delay until after VDI activation) |
| send handshake to transmitter |
| Synchronisation point 1 |
| restore the domain, deserialising it from the transmitter |
| Synchronisation point 2 |
| receive handshake from transmitter |
| Synchronisation point 3 |
| activate VDIs (unless it's a localhost migrate) |
| restore the devices (unless done already) |
| unpause the domain |
| plug PCI devices |
| send handshake to transmitter |
| Synchronisation point 4 |
You may be interested in a proposal for CrossPoolMigration
