vdsmd has been started service vdsmd start vdsm: already running [ OK ] vdsm start [ OK ] I checked /var/log/vdsm/vdsm.log . 7 MB. Most repeated errors VM Channels Listener::DEBUG::2021-05-26 15:01:01,741::vmChannels::128::vds::(_handle_unconnected) Trying to connect fileno 95. GuestMonitor-SFTP-R::DEBUG::2021-05-26 15:01:01,938::vm::645::vm.Vm::(_getDiskStats) vmId=`cc75abe4-94d3-44da-8a9c-f05a5c55f55f`::Disk hdc stats not available GuestMonitor-SFTP-R::DEBUG::2021-05-26 15:01:01,939::vm::645::vm.Vm::(_getDiskStats) vmId=`cc75abe4-94d3-44da-8a9c-f05a5c55f55f`::Disk vda stats not available GuestMonitor-SFTP-R::DEBUG::2021-05-26 15:01:01,939::vm::684::vm.Vm::(_getDiskLatency) vmId=`cc75abe4-94d3-44da-8a9c-f05a5c55f55f`::Disk hdc latency not available GuestMonitor-SFTP-R::DEBUG::2021-05-26 15:01:01,939::vm::684::vm.Vm::(_getDiskLatency) vmId=`cc75abe4-94d3-44da-8a9c-f05a5c55f55f`::Disk vda latency not available VM Channels Listener::DEBUG::2021-05-26 15:01:01,987::vmChannels::128::vds::(_handle_unconnected) Trying to connect fileno 95. VM Channels Listener::DEBUG::2021-05-26 15:01:02,988::vmChannels::128::vds::(_handle_unconnected) Trying to connect fileno 95. BindingXMLRPC::ERROR::2021-05-26 15:01:03,732::BindingXMLRPC::84::vds::(threaded_start) xml-rpc handler exception Traceback (most recent call last): File "/usr/share/vdsm/BindingXMLRPC.py", line 80, in threaded_start self.server.handle_request() File "/usr/lib64/python2.6/SocketServer.py", line 278, in handle_request self._handle_request_noblock() File "/usr/lib64/python2.6/SocketServer.py", line 288, in _handle_request_noblock request, client_address = self.get_request() File "/usr/lib64/python2.6/SocketServer.py", line 456, in get_request return self.socket.accept() File "/usr/lib64/python2.6/site-packages/vdsm/SecureXMLRPCServer.py", line 136, in accept raise SSL.SSLError("%s, client %s" % (e, address[0])) SSLError: sslv3 alert certificate unknown, client 127.0.0.1 VM Channels Listener::DEBUG::2021-05-26 15:01:03,742::vmChannels::91::vds::(_handle_timeouts) Timeout on fileno 91. VM Channels Listener::DEBUG::2021-05-26 15:01:03,743::vmChannels::128::vds::(_handle_unconnected) Trying to connect fileno 95. VM Channels Listener::DEBUG::2021-05-26 15:01:04,744::vmChannels::128::vds::(_handle_unconnected) Trying to connect fileno 95. So I checked disks df -h df: `/rhev/data-center/mnt/10.10.0.56:_vm': Input/output error Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_hv3-lv_root 50G 21G 27G 44% / tmpfs 7.8G 20K 7.8G 1% /dev/shm /dev/sda1 485M 68M 393M 15% /boot /dev/mapper/vg_hv3-lv_home 49G 12G 35G 25% /home /dev/mapper/vg_hv3-LogVol03 445G 355G 68G 85% /vm hv3.RCV-wmc.local:/ISO 50G 21G 27G 44% /rhev/data-center/mnt/hv3.RCV-wmc.local:_ISO hv3.RCV-wmc.local:/vm 445G 355G 68G 85% /rhev/data-center/mnt/hv3.RCV-wmc.local:_vm 10.10.0.60:/vm 489G 51G 438G 11% /rhev/data-center/mnt/10.10.0.60:_vm 10.10.0.28:/bacula 457G 379G 79G 83% /rhev/data-center/mnt/10.10.0.28:_bacula 10.10.0.28:/BACKUP_oVirt 457G 379G 79G 83% /rhev/data-center/mnt/10.10.0.28:_BACKUP__oVirt I guess that below is a real problem /rhev/data-center/mnt/10.10.0.56:_vm': Input/output error I still digging :)