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Re: [libvirt] 答复: 答复: Help:Can libvi rt restore several xen snapshots more faster at same time?



On 11/15/2017 02:36 AM, Chenjia (C) wrote:
Dear libvirt expert:
	Thanks for your reply.
	if  we use ' virsh restore file --bypass-cache', we got the error message: 'unsupported flags (0x1) in function libxlDomainRestoreFlags'.

--bypass-cache is not yet supported in the Xen driver. Should be easy to add, patches welcome :-).

	By the way , May be our goal is not  make it clear to you, add argument:'--bypass-cache'  means ' avoid file system cache when restoring', it means if we restore one state file for the second time , it will be more slower than normal , because IO is slower than cache, am I  right?

But you don't restore from the *same* file right? You restore VM1 from state- file1, VM2 from state-file2, etc., correct? Restoring from the same state file twice would result in 2 instances of the same VM. Actually, the libvirt Xen driver does not even allow this

# virsh start test-hvm
Domain test-hvm started
# virsh save test-hvm /tmp/test-save.img

Domain test-hvm saved to /tmp/test-save.img
# virsh restore /tmp/test-save.img
Domain restored from /tmp/test-save.img
xen81:~ # virsh restore /tmp/test-save.img
error: Failed to restore domain from /tmp/test-save.img
error: Requested operation is not valid: domain 'test-hvm' is already active

Regards,
Jim


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