Re: [libvirt-users] virsh dump

On 08/10/2012 05:31 PM, Harish Patil wrote: > Hi > I have both host and KVM/QEMU guest VM running linux. > > Questions: > What are the constituents of the virsh dump? > - What all areas does it dumps? By default, it dumps in the same format needed to migrate a VM from one host to another. As of 0.9.13 and new enough qemu (basically, a feature in qemu.git but not released until the upcoming qemu 1.2), you can also use 'virsh dump --memory-only' to force a dump to an ELF image instead. > - Is it same as taking guest VM's core dump via kexec/kdump? If you use the --memory-only option, then it is very similar (although the dump is performed without guest involvement). If you want an actual kexec/kdump from the guest, then you'll have to have the guest create that; it may be worth requesting a qemu-ga guest agent command to trigger a guest to dump itself.

> - Does it include QEMU's info to debug qemu-level issues? No, it is not a core dump of the qemu process itself. -- Eric Blake eblake(a)redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org