On 22.02.2017 16:04, Darac Marjal wrote:
StackExchange (http://serverfault.com/questions/407842/incredibly-slow-kvm-disk-performance-qcow2-disk-files-virtio) suggests that QCOW2 may be a factor, and to use: $ qemu-img create -f qcow2 -o preallocation=metadata,compat=1.1,lazy_refcounts=on imageXYZ but there's a bunch of other cargo-cult options to try, too! :D
I've read that thread. But I don't want to preallocate all space.