Anyways, I will try to upgrade KVM to 1.7 first (many backup related
changes).
We can then test again and try to optimize further.
Cesar, from my testing KVM 1.7 fixed the backup related performance issues.
See archive:
http://pve.proxmox.com/pipermail/pve-devel/2013-December/009296.html
The buffers related to Live backup are for the data sent to the backup,
not the data sent to the VMs disk.
The data sent to the disk will still use whatever cache policy you have
set for that disk.
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