The tunneled mode for migration is built on GNU TLS and is rather slow.
Interest moved to NBD (which currently doesn't support any encryption)
which is (quite a bit) faster, and the tunneled migration function gets
no love.
Likely that any encryption added to NBD will have the same performance
degradation.
On 1/9/15 3:59 PM, Yagmur Akbulut wrote:
We are working on nova live-migration using Ceph and trying to work
around the problem where vm migration fails if name resolution is not
enabled in a cluster. See the link,
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Host_Configuration_and_Guest_Installation_Guide/App_Migration_Address.html
We have managed to work around this by setting the flag to include
“VIR_MIGRATE_TUNNELLED”.
However, it is noticebaly slower than non tunnelled.
We were hoping that setting the listen_addr would get libvirt to return
the listen_addr rather than the hostname but virGetHostname in
libvirt/src/util/virutil.c doesn’t have access to the config structure.
I was wondering if libvirt can be patched in a way to return the ip
address of the destination instead of the hostname during migration?
--
Gary R Hook
Senior Kernel Engineer
NIMBOXX, Inc
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