hi all,
currently, if I restore a vm when the vm is running, it will cause two running
vms with the same name/uuid (the second vm is not functional due to disk image
in use).
# xm create OVM_EL5U1_X86_64_PVM_4GB
# xm list
Name ID Mem VCPUs State Time(s)
Domain-0 0 543 2 r----- 400.1
OVM_EL5U1_X86_64_PVM_4GB 3 128 1 -b---- 14.2
# xm save 3 /tmp/s1
# xm create OVM_EL5U1_X86_64_PVM_4GB
# xm restore /tmp/s1
# xm list
Name ID Mem VCPUs State Time(s)
Domain-0 0 543 2 r----- 411.6
OVM_EL5U1_X86_64_PVM_4GB 4 128 1 -b---- 15.3
OVM_EL5U1_X86_64_PVM_4GB 5 128 1 -b---- 0.7
# xm log
--snip--
[2008-01-23 05:13:57 2502] DEBUG (DevController:603) hotplugStatusCallback 5.
[2008-01-23 05:13:57 2502] ERROR (XendCheckpoint:286) Device 768 (vbd) could
not be connected.
File /share/vm/OVM_EL5U1_X86_64_PVM_4GB/system.img is loopback-mounted through
/dev/loop0,
which is mounted in a guest domain,
and so cannot be mounted now.
Traceback (most recent call last):
File "/usr/lib/python2.4/site-packages/xen/xend/XendCheckpoint.py", line 284,
in restore
dominfo.waitForDevices() # Wait for backends to set up
File "/usr/lib/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 565,
in waitForDevices
self.getDeviceController(devclass).waitForDevices()
File "/usr/lib/python2.4/site-packages/xen/xend/server/DevController.py", line
151, in waitForDevices
return map(self.waitForDevice, self.deviceIDs())
File "/usr/lib/python2.4/site-packages/xen/xend/server/DevController.py", line
186, in waitForDevice
raise VmError("Device %s (%s) could not be connected.\n%s" %
VmError: Device 768 (vbd) could not be connected.
File /share/vm/OVM_EL5U1_X86_64_PVM_4GB/system.img is loopback-mounted through
/dev/loop0,
which is mounted in a guest domain,
and so cannot be mounted now.
--snip--
if set the disk emulation mode to 'w!', both vms will be functional, but the
filesystem will crash soon.
local live migration has this issue two.
this patch makes name/uuid uniqueness check when restore. but it will disable
local migration.
please give some advice on resolving this problem while don't break local
migration. if cannot find one, I prefer disable local migration.
thanks,
zhigang
--- xen-3.1.2.orig/tools/python/xen/xend/XendCheckpoint.py 2008-01-15
19:19:14.000000000 +0800
+++ xen-3.1.2/tools/python/xen/xend/XendCheckpoint.py 2008-01-22
13:27:21.000000000 +0800
@@ -170,6 +170,13 @@ def restore(xd, fd, dominfo = None, paus
vmconfig = p.get_val()
+ domconfig = XendConfig(sxp_obj = vmconfig)
+ othervm = xd.domain_lookup_nr(domconfig["name_label"])
+ if othervm is None or othervm.domid is None:
+ othervm = xd.domain_lookup_nr(domconfig["uuid"])
+ if othervm is not None and othervm.domid is not None:
+ raise VmError("Domain '%s' already exists with ID '%d'" %
(domconfig["name_label"], othervm.domid))
+
if dominfo:
dominfo.resume()
else:
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