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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