[libvirt-users] Adjust disk image migration (NBD)

Joaquim Barrera jbarrera at ac.upc.edu
Fri Feb 14 09:40:37 UTC 2014


Hi all,

As I am doing some tests with qemu, I realized that the way it does 
'migrate -i tcp:DEST:444' is not the same as 'libvirt migrate 
--copy-storage-inc'. Basically qemu uses the same stream as RAM 
migration and libvirt takes advantage of NBD transfer.

With virsh migrate-setspeed I observed that one can only control the 
transfer throughput of RAM, but not disk synchronization. At least this 
is what I can see in bmon when doing a migration with incremental copy.

The question is: Am I missing something or it is not implemented?

Thank you guys!
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