[ovirt-devel] Reporting vm disk stats "truesize" and "apparentsize"?

Hi all, Vdsm reports apparentsize and truesize disk stats [1] when getting vms stats (every 15 seconds?). These values are update every 60 seconds in vdsm. To collect the values, we run risky storage apis in vdsm virt thread pool, and we want to avoid this [2] since one slow or broken domain can cause the entire virt thread pool to get stuck and cause vms using other (healthy) storage domain to become non responsive. These can also break block storage thin provisioned disks, since they depend also on the virt thread pool. So one bad NFS storage domain can cause vms using only block storage to be paused. If both of these values are not used by anyone, we would like to stop reporting them. If the values are used, we need to find a safer way to report them, probably in storage thread pool, or maybe we can get these values from libvirt using bulk sampling. Please update if these values are used in engine/dwh. [1] https://github.com/oVirt/vdsm/blob/master/lib/vdsm/virt/vmstats.py#L364 [2] https://gerrit.ovirt.org/59801 Nir