http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1328
Summary: live migration with DomU's vcpu = 1
Product: Xen
Version: 3.0.1
Platform: x86-64
OS/Version: Linux-2.6
Status: NEW
Severity: normal
Priority: P2
Component: Guest-OS
AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
ReportedBy: ikedaj@xxxxxxxxxxxxxxxxx
I am trying to have DomU migrate with --live option,
and notice the following behavior.
case 1)
Dom0's vcpu = 4, DomU's vcpu = 1
live migration is really unstable...
if xend is restarted, the migration might succeed, but it's still unstable.
/var/log/xen/xend.log (destination node)
[2008-08-19 17:30:03 xend 13275] DEBUG (balloon:127) Balloon: 4202040 KiB free;
need 2097152; done.
[2008-08-19 17:30:03 xend 13275] DEBUG (XendCheckpoint:215) [xc_restore]:
/usr/lib64/xen/bin/xc_restore 4 6 1 2 0 0 0
[2008-08-19 17:30:07 xend 13275] INFO (XendCheckpoint:351) ERROR Internal
error: read: p2m_size
[2008-08-19 17:30:07 xend 13275] INFO (XendCheckpoint:351) Restore exit with
rc=1
[2008-08-19 17:30:07 xend.XendDomainInfo 13275] DEBUG (XendDomainInfo:1560)
XendDomainInfo.destroy: domid=6
[2008-08-19 17:30:07 xend.XendDomainInfo 13275] DEBUG (XendDomainInfo:1568)
XendDomainInfo.destroyDomain(6)
[2008-08-19 17:30:07 xend.XendDomainInfo 13275] ERROR (XendDomainInfo:1575)
XendDomainInfo.destroy: xc.domain_destroy failed.
Traceback (most recent call last):
File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", line
1573, in destroyDomain
xc.domain_destroy(self.domid)
Error: (3, 'No such process')
[2008-08-19 17:30:07 xend 13275] ERROR (XendDomain:278) Restore failed
Traceback (most recent call last):
File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomain.py", line 273,
in domain_restore_fd
return XendCheckpoint.restore(self, fd)
File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py", line
219, in restore
forkHelper(cmd, fd, handler.handler, True)
File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py", line
339, in forkHelper
raise XendError("%s failed" % string.join(cmd))
XendError: /usr/lib64/xen/bin/xc_restore 4 6 1 2 0 0 0 failed
case 2)
Dom0's vcpu = 4, DomU's vcpu = 2
it's seems that the migration is sure to be done well.
case 3)
Dom0's vcpu = 1, DomU's vcpu = 1
I set "nosmp" in /boot/grub/menu.lst on both of Dom0 and DomU.
the migration process also works well.
and I found the following bug entry.
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=134
Is this fix still available ?
There is no suspend/resume functions in Xen 3.0.
# xm info
host : x3650c
release : 2.6.18-92.el5xen
version : #1 SMP Tue Apr 29 13:31:30 EDT 2008
machine : x86_64
nr_cpus : 4
nr_nodes : 1
sockets_per_node : 2
cores_per_socket : 2
threads_per_core : 1
cpu_mhz : 2992
hw_caps :
bfebfbff:20000800:00000000:00000140:0004e3bd:00000000:00000001
total_memory : 16383
free_memory : 10
node_to_cpu : node0:0-3
xen_major : 3
xen_minor : 1
xen_extra : .2-92.el5
xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_pagesize : 4096
platform_params : virt_start=0xffff800000000000
xen_changeset : unavailable
cc_compiler : gcc version 4.1.2 20071124 (Red Hat 4.1.2-41)
cc_compile_by : brewbuilder
cc_compile_domain : build.redhat.com
cc_compile_date : Tue Apr 29 13:12:52 EDT 2008
xend_config_format : 2
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