On 08/24/2017 01:04 AM, [email protected] wrote:
Hello:
I am using openstack + libvirt + qemu-kvm. The speed of copying files
between virtual machines exceeds 300M Byte per second but the speed of dd
command:
"watch dd oflag=direct,nonblock if=/dev/zero of=/opt/iotest1 bs=4M count=10"
is around 20M byte per second. Every guest is the same, and there is no io
tuning in libvirt. What can I do to unleash the speed of disk io speed inside
the guest?
Thanks!
It looks like you're using ceph for your root disk. What sort of performance do
you get accessing the ceph volumes from the host?
Chris
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