Hi guys and gals,

I'm able to do live migration via 'nova live-migration', as long as my 
instances are sitting on shared storage. However, when they are not, nova 
live-migrate fails, due to a shared storage check.

To get around this, I attempted to do a live migration via libvirt directly. 
Using the feature "--copy-storage-all" fails. Part of the trouble with this is 
that even though nova is booted from a volume stored on ceph, there are still 
support files (eg console.log, disk.config) that reside in the instances 
directory. The virsh command (I've tried many combinations of many different 
migration approaches) is "virsh migrate --live --copy-storage-all 
instance-0000000c qemu+ssh://target/system". This fails due to libvirt not 
creating the instance dir and copying the support files to the target.

I'm curious if anyone has been able to get something like this to work. I'd 
really love to get ceph-backed live migration going without adding the overhead 
of shared storage for nova too.

Thanks,

Donald Talton
Cloud Systems Development
Cisco Systems


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