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 -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list
