Hello Rock, Can you turn on debug logs in nova.conf and post it on, e.g., http://paste.openstack.org/ ? Also, please attach logs from libvirt, usually /var/log/libvirt/libvirtd.log (from source host and destination host). Kind Regards, Pawel Koniszewski From: libvirt-users-bounces(a)redhat.com [mailto:libvirt-users-bounces@redhat.com] On Behalf Of RockCui(a)zhaoxin.com Sent: Tuesday, May 12, 2015 12:20 PM To: libvirt-users(a)redhat.com Subject: [libvirt-users] Live Migration failure: An error occurred, but the cause is unknown Hi everyone, I’m testing the new Openstack Kilo on Ubuntu-15.04 and hypervisor is KVM. I can creat instance successfully , but live migration is always failed. Error report like this (from nova-compute.log on a compute node): 2015-05-12 18:11:12.753 3641 INFO nova.virt.libvirt.driver [-] [instance: cee4965c-b298-4b5b-8669-bee9ac72c720] Migration running for 0 secs, memory 0% remaining; (bytes processed=0, remaining=0, total=0) 2015-05-12 18:11:16.342 3641 ERROR nova.virt.libvirt.driver [-] [instance: cee4965c-b298-4b5b-8669-bee9ac72c720] Live Migration failure: An error occurred, but the cause is unknown 2015-05-12 18:11:16.777 3641 ERROR nova.virt.libvirt.driver [-] [instance: cee4965c-b298-4b5b-8669-bee9ac72c720] Migration operation has aborted If someone has a clue what may cause this, pls help. Thanks. Rock Cui 本邮件仅针对指定的收件人发送并可能含有保密或专有内容。任何非指定收件人所为之查阅、转发或使用本信息是不被允许的。 如果您误收到本邮件，请立即告知发件人并删除本邮件及所有附件。谢谢！ The information transmitted in this e-mail is intended only for the addressee and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of this information by persons or entities other than the intended recipient is prohibited. If you received this e-mail in error, please notify the sender immediately, and delete this e-mail and any attachments. Thank you.