[one-users] slow live migration of VM's

[Gary S. Cuozzo]

Hi all, 
I was just moving some VM's around as a prep for some server maintenance, via live migration. I moved 3 VM's which were all fairly small in size of 1GB - 3GB RAM and 20GB - 60GB disk. I did the migrations 1 at a time. I was surprised at how long the migrations took and also that each VM was pretty much unusable during the migration. SSH sessions timed out and websites were not able to be accessed. A VM with 3GB RAM allocation took around 10 minutes to migrate. 

Is this typical? Or do I maybe have some sort of issue on my network or config? We run a dedicated 1000Mbps management network for this type of thing, and all data storage access is via separate 4x 1000Mbps bonded channels. I would have expected 3GB of RAM data to be pretty quick. Probably < 1 min. 

Are there any settings in ONE that should be tuned? I don't seem to recall having an issue with migrations when I was just running virt-manager/libvirt directly. 

The last VM I have to move is a pretty important one and it has 24GB RAM allocated. So I think it would be easier/quicker to just shut the VM down, disable the host for maintenance, and redeploy it. I'm hoping to avoid that. 

Thanks for any advice, 
gary 


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