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[libvirt] 1. Domain Destroy , 2. Domain boot on a different host and 3. Domain start time



Hello,
 
Firstly, I have some confusion about the libvirt API  "virDomainDestroy" method. here is the link to API: http://libvirt.org/html/libvirt-libvirt.html#virDomainDestroy
Does this method completely removes the domain from the system? I have confusion because the "virsh destroy" tool option performs a forced shutdown and does not destroy/delete/remove the domain.
So,  what does "virDomainDestroy" method do exactly? Also, if it comletely removes the domain, then is there any other method to perform a force shutdown of the domain. I know the "virDomainShutdown" method performs a normal shutdown.
 
Secondly, Is it possible to boot a domain on a completely different physical host with the same Hypervisor configuration?
For. E.g: if I have a domain on a host 192.168.101.1 running Xen with a Domain "test" in shutdown state. If I have to start/boot the domain "test" on a different physical host, running Xen say 192.168.101.2, is it possible using libvirt API? If not, then is there any other method to do it?
 
Thirdly, Is there a method to get the total running time of a domain? I mean, the amount of time since the domain had been booted. Currently, I can fetch the CPU time. But, is this the exact amount of time the domain is ON? i.e. If the domain is in a "IDLE" state, the CPU time does not increase. But what I want is the amount of time the domain was ON(including the idle time). So, If I can get the start time of the domain, I can calculate the duration.
 
Sorry for the long mail and description.
 
Any help would be greatly appreciated.
 
Thanks and Regards
Sagar Barve

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