using kolla-ansible and trying to lower nova image-cache cleaning interval.

I setup this value, but seems doing nothing despite the vms are deleted by far more than 600 secs, any help? where is a log of it?

nano /etc/kolla/config/nova.conf
"
[image_cache]
image_cache_manager_interval=600
remove_unused_base_images=true
remove_unused_original_minimum_age_seconds=600
remove_unused_resized_minimum_age_seconds=600
"
kolla-ansible -i multinode reconfigure --tags=nova

thank you.