In the engine.log appears following:
2017-11-14 12:04:33,081+03 ERROR [org.ovirt.engine.core.bll.pm.FenceProxyLocator] (default task-184) [32fe1ce0-2e25-4e2e-a6bf-59f39a65b2f1] Can not run fence action on host 'ovirt.prod.env', no suitable proxy host was found.
2017-11-14 12:04:36,534+03 INFO [org.ovirt.engine.core.bll.hostdeploy.UpdateVdsCommand] (default task-186) [d83ce46d-ce89-4804-aba1-761103e93e8c] Running command: UpdateVdsCommand internal: false. Entities affected : ID: a9bb1c6f-b9c9-4dc3-a24e-b83b2004552d Type: VDSAction group EDIT_HOST_CONFIGURATION with role type ADMIN
2017-11-14 12:04:36,704+03 ERROR [org.ovirt.engine.core.bll.pm.FenceProxyLocator] (default task-186) [d83ce46d-ce89-4804-aba1-761103e93e8c] Can not run fence action on host 'ovirt.prod.env', no suitable proxy host was found.
2017-11-14 12:04:36,705+03 INFO [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogableBase] (default task-186) [d83ce46d-ce89-4804-aba1-761103e93e8c] Failed to get vds 'a9bb1c6f-b9c9-4dc3-a24e-b83b2004552d', error: null
2017-11-14 12:04:36,705+03 INFO [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogableBase] (default task-186) [d83ce46d-ce89-4804-aba1-761103e93e8c] Failed to get vds 'a9bb1c6f-b9c9-4dc3-a24e-b83b2004552d', error: null
2017-11-14 12:04:36,705+03 INFO [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogableBase] (default task-186) [d83ce46d-ce89-4804-aba1-761103e93e8c] Failed to get vds 'a9bb1c6f-b9c9-4dc3-a24e-b83b2004552d', error null
2017-11-14 12:04:36,705+03 INFO [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogableBase] (default task-186) [d83ce46d-ce89-4804-aba1-761103e93e8c] Failed to get vds 'a9bb1c6f-b9c9-4dc3-a24e-b83b2004552d', error null
2017-11-14 12:04:36,720+03 WARN [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (default task-186) [d83ce46d-ce89-4804-aba1-761103e93e8c] EVENT_ID: VDS_ALERT_PM_HEALTH_CHECK_START_MIGHT_FAIL(9,010), Correlation ID: null, Call Stack: null, Custom Event ID: -1, Message: Health check on Host <UNKNOWN> indicates that future attempts to Start this host using Power-Management are expected to fail.
2017-11-14 12:04:36,720+03 INFO [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogableBase] (default task-186) [d83ce46d-ce89-4804-aba1-761103e93e8c] Failed to get vds 'a9bb1c6f-b9c9-4dc3-a24e-b83b2004552d', error: null
2017-11-14 12:04:36,720+03 INFO [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogableBase] (default task-186) [d83ce46d-ce89-4804-aba1-761103e93e8c] Failed to get vds 'a9bb1c6f-b9c9-4dc3-a24e-b83b2004552d', error: null
2017-11-14 12:04:36,720+03 INFO [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogableBase] (default task-186) [d83ce46d-ce89-4804-aba1-761103e93e8c] Failed to get vds 'a9bb1c6f-b9c9-4dc3-a24e-b83b2004552d', error null
2017-11-14 12:04:36,720+03 INFO [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogableBase] (default task-186) [d83ce46d-ce89-4804-aba1-761103e93e8c] Failed to get vds 'a9bb1c6f-b9c9-4dc3-a24e-b83b2004552d', error null
2017-11-14 12:04:36,731+03 WARN [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (default task-186) [d83ce46d-ce89-4804-aba1-761103e93e8c] EVENT_ID: VDS_ALERT_PM_HEALTH_CHECK_STOP_MIGHT_FAIL(9,011), Correlation ID: null, Call Stack: null, Custom Event ID: -1, Message: Health check on Host <UNKNOWN> indicates that future attempts to Stop this host using Power-Management are expected to fail.
2017-11-14 12:04:36,765+03 WARN [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (default task-186) [d83ce46d-ce89-4804-aba1-761103e93e8c] EVENT_ID: KDUMP_DETECTION_NOT_CONFIGURED_ON_VDS(617), Correlation ID: null, Call Stack: null, Custom Event ID: -1, Message: Kdump integration is enabled for host ovirt.prod.env, but kdump is not configured properly on host.
2017-11-14 12:04:36,781+03 INFO [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (default task-186) [d83ce46d-ce89-4804-aba1-761103e93e8c] EVENT_ID: USER_UPDATE_VDS(43), Correlation ID: d83ce46d-ce89-4804-aba1-761103e93e8c, Call Stack: null, Custom Event ID: -1, Message: Host ovirt.prod.env configuration was updated by arta00@internal-authz.
Just let me know if more logs are needed.