[ovirt-users] Re: owner of vm paused/unpaused operation

On Tue, Oct 8, 2019 at 4:06 PM Gianluca Cecchi <gianluca.cecchi(a)gmail.com&gt; wrote: I have noticed that when virtual disk is virtio, the VM is not able to be unpaused in storage unreachable for many seconds, while if I have virtio-scsi and set high virtual disk timeout (like vSphere does on VMs when vmware tools have been installed), then VM is able to be resumed. The udev rule I have put into a CentOS 7 VM inside /etc/udev/rules.d/99-ovirt.rules is this one # Set timeout of virtio-SCSI disks to 180 secons like vSphere vmware tools # ACTION=="add", SUBSYSTEMS=="scsi", ATTRS{vendor}=="QEMU*", ATTRS{model}=="QEMU HARDDISK*", ENV{DEVTYPE}=="disk", RUN+="/bin/sh -c 'echo 180 > /sys$DEVPATH/device/timeout'" What I have not understood is if it is possible to prevent at all vdsm (is it the responsible?) to suddenly put the VM in paused state. Eg for experiment I have iSCSI based storage domains and put this in multipath.conf devices { device { all_devs yes # Set timeout of queuing of 5*28 = 140 seconds # similar to vSphere APD timeout # no_path_retry fail no_path_retry 28 polling_interval 5 } Then I create an iptables rule that for 100 seconds prevents host to reach storage and a dd task that writes on disk inside VM The effect is that vm is paused and after about 100 seconds VM mydbsrv has recovered from paused back to up. 10/9/19 1:59:02 PM VM mydbsrv has been paused due to storage I/O problem. 10/9/19 1:57:32 PM VM mydbsrv has been paused. 10/9/19 1:57:32 PM Any hint on how to prevent action of pausing the VM? Thanks, Gianluca