[libvirt] strange behavior when using iotune

Vasiliy Tolstov v.tolstov at selfip.ru
Mon Nov 24 12:02:50 UTC 2014

Hi. I'm try to shape disk via total_iops_sec in libvirt
libvirt 1.2.10
qemu 2.0.0

Firstly when i'm run vm with predefined
<total_iops_sec>5000</total_iops_sec> i have around 11000 iops (dd
if=/dev/sda bs=512K of=/dev/null)
After that i'm try to set via virsh --total_iops_sec 10 to want to
minimize io, but nothing changed.
After that i'm reboot vm with <total_iops_sec>10</total_iops_sec> and
get very slow io, but this expected. But libvirt says that i have is
around 600 iops.

My questions is - why i can't change total_iops_sec in run-time, and
why entered values does not equal values getting from libvirt ?

Thanks for any suggestions and any help.

Vasiliy Tolstov,
e-mail: v.tolstov at selfip.ru
jabber: vase at selfip.ru

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