Description of problem:
We have around 80 VMs for developers and all disks of them have the default disk profile assigned.
On this disk profile, there is special QoS storage rule assigned, named Dev.

When I now change the IO limits from Storage QoS Dev, only some of the disks get the changed values assigned.
Most of the disks still have the old IO limits active.

I have to edit and save each disk and then the new QoS will be applied.

As you can in the logs from one of the hosts in Additional info:
On this hosts are 8 VMs running, but only two of them got the update form the change. I also have seen, that some disks, which haven't been updated, have an unlimited IO limit, althogh they have the same QoS rule.
Updated VMs:
vmId='d2f0922c-97b2-43be-ad96-25595f3ecb87'
vmId='7d441b7e-bca6-41b7-a112-7317cbb27fe3'

All other VMs should also have been updated...

Version-Release number of selected component (if applicable):
4.2.5.2-1.el7

How reproducible:

Steps to Reproduce:
1. Assign default disk profile a IO limit rule
2. A lot of VMs and disks with this default disk profile
3. Edit IO limit

Actual results:
-> only a small subset of disks get the new rule applied


Expected results:
-> all disks should get new limits applied


Additional info:
In engine log, I see the change of the Storage QoS profile and that engine is sending the change to only a small subset of VMs, but it looks like that at least all hosts are mentioned.

engine.log
2018-11-15 09:11:02,688Z INFO  [org.ovirt.engine.core.bll.VmSlaPolicyCommand] (EE-ManagedThreadFactory-engine-Thread-36) [14e135cc] Running command: VmSlaPolicyCommand internal: true. Entities affected :  ID: d2f0922c-97b2-43be-ad96-25595f3ecb87 Type: VMAction group EDIT_VM_PROPERTIES with role type USER
2018-11-15 09:11:02,702Z INFO  [org.ovirt.engine.core.bll.VmSlaPolicyCommand] (EE-ManagedThreadFactory-engine-Thread-40) [5ac61284] Running command: VmSlaPolicyCommand internal: true. Entities affected :  ID: 7d441b7e-bca6-41b7-a112-7317cbb27fe3 Type: VMAction group EDIT_VM_PROPERTIES with role type USER
2018-11-15 09:11:02,689Z INFO  [org.ovirt.engine.core.vdsbroker.UpdateVmPolicyVDSCommand] (EE-ManagedThreadFactory-engine-Thread-36) [14e135cc] START, UpdateVmPolicyVDSCommand(HostName = host-01, UpdateVmPolicyVDSParams:{hostId='713b6bd4-a367-47cb-80b8-da4264966caa', vmId='d2f0922c-97b2-43be-ad96-25595f3ecb87'}), log id: 4173d65f
2018-11-15 09:11:02,704Z INFO  [org.ovirt.engine.core.vdsbroker.UpdateVmPolicyVDSCommand] (EE-ManagedThreadFactory-engine-Thread-40) [5ac61284] START, UpdateVmPolicyVDSCommand(HostName = host-01, UpdateVmPolicyVDSParams:{hostId='713b6bd4-a367-47cb-80b8-da4264966caa', vmId='7d441b7e-bca6-41b7-a112-7317cbb27fe3'}), log id: 3655818b

2018-11-15 09:11:02,747Z INFO  [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-engine-Thread-36) [14e135cc] EVENT_ID: VM_SLA_POLICY_STORAGE(10,551), VM vm-01 SLA Policy was set. Storage policy changed for disks: [tmp, log, root]
2018-11-15 09:11:02,786Z INFO  [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-engine-Thread-40) [5ac61284] EVENT_ID: VM_SLA_POLICY_STORAGE(10,551), VM vm-02 SLA Policy was set. Storage policy changed for disks: [vm-02_home]


vdsm.log
2018-11-15 09:11:01,596+0000 INFO  (jsonrpc/7) [api.host] FINISH getAllVmIoTunePolicies return={'status': {'message': 'Done', 'code': 0}, 'io_tune_policies_dict': {'34a069f6-dae3-4814-ab07-26dc20279f40': {'policy': [{'path': '/rhev/data-center/00000001-0001-0001-0001-000000000089/b2205a91-3cab-4a36-851e-703e6fd2f429/images/d79dd5fd-1c32-4b41-9622-08a3355d03a3/8e723b83-833a-4313-a595-15e7b2f9a96a', 'guaranteed': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 500, 'read_bytes_sec': 0, 'write_iops_sec': 500, 'total_bytes_sec': 0}, 'name': 'sda', 'maximum': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 500, 'read_bytes_sec': 0, 'write_iops_sec': 500, 'total_bytes_sec': 0}}], 'current_values': [{'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 500L, 'read_bytes_sec': 0L, 'write_iops_sec': 500L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/d79dd5fd-1c32-4b41-9622-08a3355d03a3/8e723b83-833a-4313-a595-15e7b2f9a96a', 'name': 'sda'}]}, 
'7d441b7e-bca6-41b7-a112-7317cbb27fe3': {'policy': [{'path': '/rhev/data-center/mnt/nfs-data-dev-01:_oVirt__DC__NFS__DATA__DEV__01/89f400d3-7d53-4116-b945-2fc223db78a9/images/9b39f19e-5e3e-409b-8eec-2adb8c909284/2d980070-ae87-4d55-8168-bd401d639fad', 'guaranteed': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 3000, 'read_bytes_sec': 0, 'write_iops_sec': 2000, 'total_bytes_sec': 0}, 'name': 'sdb', 'maximum': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 3000, 'read_bytes_sec': 0, 'write_iops_sec': 2000, 'total_bytes_sec': 0}}, {'path': '/rhev/data-center/00000001-0001-0001-0001-000000000089/003972f0-def4-44d6-9208-f61fbac1578e/images/e7e89968-f349-457a-b73d-98634324e7d3/2dc5c08c-f61c-4f5b-a2f3-502a96a391e9', 'guaranteed': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 0, 'read_bytes_sec': 0, 'write_iops_sec': 0, 'total_bytes_sec': 0}, 'name': 'sdc', 'maximum': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 0, 'read_bytes_sec': 0, 'write_iops_sec': 0, 'total_bytes_sec': 0}}], 'current_values': [{'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/c589b71b-b796-4615-9267-f3a045e8af4c/4ce0206c-ad80-4f06-954f-321154e55ebc', 'name': 'vda'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/56e6a904-8511-45c8-8eec-42048b46a1e6/a34e115a-b0c4-46ce-a6f9-e026973c9258', 'name': 'sda'}, {'ioTune': {u'write_bytes_sec': 0, u'total_iops_sec': 0, u'read_iops_sec': 3000, u'read_bytes_sec': 0, u'write_iops_sec': 2000, u'total_bytes_sec': 0}, 'path': '/rhev/data-center/mnt/nfs-data-dev-01:_oVirt__DC__NFS__DATA__DEV__01/89f400d3-7d53-4116-b945-2fc223db78a9/images/9b39f19e-5e3e-409b-8eec-2adb8c909284/2d980070-ae87-4d55-8168-bd401d639fad', 'name': 'sdb'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-data-dev-01:_oVirt__DC__NFS__DATA__DEV__01/89f400d3-7d53-4116-b945-2fc223db78a9/images/e7e89968-f349-457a-b73d-98634324e7d3/2dc5c08c-f61c-4f5b-a2f3-502a96a391e9', 'name': 'sdc'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/2373d451-8251-41a0-bacb-b14e5fd0ba96/92f374bc-4126-48df-8355-8cea49bb3563', 'name': 'sdd'}]}, 
'd2f0922c-97b2-43be-ad96-25595f3ecb87': {'policy': [{'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/6d78559d-29fa-47fe-95eb-97eea2c12368/09db6f61-f95f-4d51-a20e-0b9442f31fa1', 'guaranteed': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 3000, 'read_bytes_sec': 0, 'write_iops_sec': 2000, 'total_bytes_sec': 0}, 'name': 'sda', 'maximum': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 3000, 'read_bytes_sec': 0, 'write_iops_sec': 2000, 'total_bytes_sec': 0}}, {'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/85615142-338f-4e24-9e63-71a3acf3dbc2/81b9c06f-da7a-4aff-a06e-205ed61bdaab', 'guaranteed': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 3000, 'read_bytes_sec': 0, 'write_iops_sec': 2000, 'total_bytes_sec': 0}, 'name': 'vda', 'maximum': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 3000, 'read_bytes_sec': 0, 'write_iops_sec': 2000, 'total_bytes_sec': 0}}, {'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/838a4008-e166-4607-81b9-416e34e7a273/e0573c50-ee3b-4d73-bc2c-69fdded6eb20', 'guaranteed': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 3000, 'read_bytes_sec': 0, 'write_iops_sec': 2000, 'total_bytes_sec': 0}, 'name': 'sdb', 'maximum': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 3000, 'read_bytes_sec': 0, 'write_iops_sec': 2000, 'total_bytes_sec': 0}}], 'current_values': [{'ioTune': {u'write_bytes_sec': 0, u'total_iops_sec': 0, u'read_iops_sec': 3000, u'read_bytes_sec': 0, u'write_iops_sec': 2000, u'total_bytes_sec': 0}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/85615142-338f-4e24-9e63-71a3acf3dbc2/81b9c06f-da7a-4aff-a06e-205ed61bdaab', 'name': 'vda'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-data-dev-01:_oVirt__DC__NFS__DATA__DEV__01/89f400d3-7d53-4116-b945-2fc223db78a9/images/d3438f3f-acc7-4b44-82c9-99914f09405b/21efea0d-85da-4bbb-82da-cfdb9aab3b64', 'name': 'vdb'}, {'ioTune': {u'write_bytes_sec': 0, u'total_iops_sec': 0, u'read_iops_sec': 3000, u'read_bytes_sec': 0, u'write_iops_sec': 2000, u'total_bytes_sec': 0}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/6d78559d-29fa-47fe-95eb-97eea2c12368/09db6f61-f95f-4d51-a20e-0b9442f31fa1', 'name': 'sda'}, {'ioTune': {u'write_bytes_sec': 0, u'total_iops_sec': 0, u'read_iops_sec': 3000, u'read_bytes_sec': 0, u'write_iops_sec': 2000, u'total_bytes_sec': 0}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/838a4008-e166-4607-81b9-416e34e7a273/e0573c50-ee3b-4d73-bc2c-69fdded6eb20', 'name': 'sdb'}]}, 
'70297d53-3470-4c0e-81d7-d36be7626bf5': {'policy': [], 'current_values': [{'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/5b91d0f5-6733-4fd1-b555-eefd058185f9/fa907af4-55a2-4aa0-8a2d-50209d9e6d07', 'name': 'vda'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/78967095-428d-4cb1-b0b3-e90c5209bd1a/a8ec5595-6e38-419b-92bf-71bfa704470a', 'name': 'sda'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/5a3691dc-7129-47e6-a2d3-49244a15213a/b98d84b6-cc3b-41b7-b24d-bec36b944514', 'name': 'sdb'}]}, 
'1b93a8e0-7de5-4d0a-8992-0eadeac8168a': {'policy': [], 'current_values': [{'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/0af0c1bc-cc65-4c81-ab81-0e7d8a86f9c1/f13e7271-7716-4a10-9f5b-c4348804f360', 'name': 'vda'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-data-dev-01:_oVirt__DC__NFS__DATA__DEV__01/89f400d3-7d53-4116-b945-2fc223db78a9/images/ccee9d29-8f3b-47c4-9689-48a09b9bf6a2/29566300-f14b-4e20-8ee6-7d3cd264d06a', 'name': 'sda'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/7549b9c9-7676-424f-a48d-11cedc38f86d/b912655d-a4df-41db-80d9-c573a86fafc4', 'name': 'sdb'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/48c77f96-c017-4344-8339-1e3974fa6608/b55662e7-a966-4ee7-b9ed-bee33264e7db', 'name': 'sdc'}]}, 
'a9bdd915-9fe2-451a-b203-fdccb1a30354': {'policy': [], 'current_values': [{'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-data-dev-01:_oVirt__DC__NFS__DATA__DEV__01/89f400d3-7d53-4116-b945-2fc223db78a9/images/5bff3bb6-2bf7-46a9-806b-be2eeda6dc7a/1bda521a-c9c2-4179-8900-39be16535830', 'name': 'sda'}]}, 
'7b9f30c5-29dc-42f8-8726-752e67d0de19': {'policy': [{'path': '/rhev/data-center/00000001-0001-0001-0001-000000000089/003972f0-def4-44d6-9208-f61fbac1578e/images/8c4a9e47-a289-44d3-89cc-3f30d92338e6/36001946-ea85-40d5-b6e1-f7bd4a73a67d', 'guaranteed': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 0, 'read_bytes_sec': 0, 'write_iops_sec': 0, 'total_bytes_sec': 0}, 'name': 'sdb', 'maximum': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 0, 'read_bytes_sec': 0, 'write_iops_sec': 0, 'total_bytes_sec': 0}}], 'current_values': [{'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/81caf48b-7afe-4619-9cd7-cd34d5d00351/92cd02d6-ed1c-477b-9212-82e318731efa', 'name': 'vda'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/bff44c23-5bbd-4b20-b693-b46fabc441c8/6cc9dde8-e225-4233-924f-43772a016e17', 'name': 'sda'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-data-dev-01:_oVirt__DC__NFS__DATA__DEV__01/89f400d3-7d53-4116-b945-2fc223db78a9/images/8c4a9e47-a289-44d3-89cc-3f30d92338e6/36001946-ea85-40d5-b6e1-f7bd4a73a67d', 'name': 'sdb'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/85f6b13b-432c-4f85-9719-0a5f22cbad52/7b4fd720-7f4f-4404-a564-63472b36ffef', 'name': 'sdc'}]}, 
'0eece078-db79-4cdd-9a31-e301fc843fe3': {'policy': [{'path': '/rhev/data-center/00000001-0001-0001-0001-000000000089/003972f0-def4-44d6-9208-f61fbac1578e/images/166c46e9-7800-44b0-b984-4f21fdaab76a/a02d757e-6189-4026-a51a-b47ae398bd84', 'guaranteed': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 0, 'read_bytes_sec': 0, 'write_iops_sec': 0, 'total_bytes_sec': 0}, 'name': 'sdc', 'maximum': {'write_bytes_sec': 0, 'total_iops_sec': 0, 'read_iops_sec': 0, 'read_bytes_sec': 0, 'write_iops_sec': 0, 'total_bytes_sec': 0}}], 'current_values': [{'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/19f33c0e-adb6-4474-93dc-60fafa228bc5/f7beba08-39d9-4779-bdaf-911b60ffd6ec', 'name': 'vda'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/cd52de1c-7249-450d-aa63-0d026e95113d/11c1feef-6368-46e8-b199-5d62ffb82345', 'name': 'sda'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-root-dev-01:_oVirt__DC__NFS__ROOT__DEV__01/e31a33bf-8020-4fa6-96d3-6ea4555f62ad/images/96da530c-7501-4d67-80bf-55769bddebb4/8be53adc-a13d-48b1-8c79-af64eb0e4c12', 'name': 'sdb'}, {'ioTune': {'write_bytes_sec': 0L, 'total_iops_sec': 0L, 'read_iops_sec': 0L, 'read_bytes_sec': 0L, 'write_iops_sec': 0L, 'total_bytes_sec': 0L}, 'path': '/rhev/data-center/mnt/nfs-data-dev-01:_oVirt__DC__NFS__DATA__DEV__01/89f400d3-7d53-4116-b945-2fc223db78a9/images/166c46e9-7800-44b0-b984-4f21fdaab76a/a02d757e-6189-4026-a51a-b47ae398bd84', 'name': 'sdc'}]}}} from=::1,38924 (api:52)

2018-11-15 09:11:02,694+0000 INFO  (jsonrpc/4) [api.virt] START updateVmPolicy(params={u'ioTune': [{u'domainID': u'e31a33bf-8020-4fa6-96d3-6ea4555f62ad', u'guaranteed': {u'write_bytes_sec': 0, u'total_iops_sec': 0, u'read_iops_sec': 2900, u'read_bytes_sec': 0, u'write_iops_sec': 2000, u'total_bytes_sec': 0}, u'volumeID': u'e0573c50-ee3b-4d73-bc2c-69fdded6eb20', u'maximum': {u'write_bytes_sec': 0, u'total_iops_sec': 0, u'read_iops_sec': 2900, u'read_bytes_sec': 0, u'write_iops_sec': 2000, u'total_bytes_sec': 0}, u'poolID': u'00000001-0001-0001-0001-000000000089', u'imageID': u'838a4008-e166-4607-81b9-416e34e7a273'}, {u'domainID': u'e31a33bf-8020-4fa6-96d3-6ea4555f62ad', u'guaranteed': {u'write_bytes_sec': 0, u'total_iops_sec': 0, u'read_iops_sec': 2900, u'read_bytes_sec': 0, u'write_iops_sec': 2000, u'total_bytes_sec': 0}, u'volumeID': u'09db6f61-f95f-4d51-a20e-0b9442f31fa1', u'maximum': {u'write_bytes_sec': 0, u'total_iops_sec': 0, u'read_iops_sec': 2900, u'read_bytes_sec': 0, u'write_iops_sec': 2000, u'total_bytes_sec': 0}, u'poolID': u'00000001-0001-0001-0001-000000000089', u'imageID': u'6d78559d-29fa-47fe-95eb-97eea2c12368'}, {u'domainID': u'e31a33bf-8020-4fa6-96d3-6ea4555f62ad', u'guaranteed': {u'write_bytes_sec': 0, u'total_iops_sec': 0, u'read_iops_sec': 2900, u'read_bytes_sec': 0, u'write_iops_sec': 2000, u'total_bytes_sec': 0}, u'volumeID': u'81b9c06f-da7a-4aff-a06e-205ed61bdaab', u'maximum': {u'write_bytes_sec': 0, u'total_iops_sec': 0, u'read_iops_sec': 2900, u'read_bytes_sec': 0, u'write_iops_sec': 2000, u'total_bytes_sec': 0}, u'poolID': u'00000001-0001-0001-0001-000000000089', u'imageID': u'85615142-338f-4e24-9e63-71a3acf3dbc2'}], u'vmId': u'd2f0922c-97b2-43be-ad96-25595f3ecb87'}) from=::ffff:10.5.16.9,55928, flow_id=14e135cc, vmId=d2f0922c-97b2-43be-ad96-25595f3ecb87 (api:46)
2018-11-15 09:11:02,701+0000 INFO  (jsonrpc/4) [api.virt] FINISH updateVmPolicy return={'status': {'message': 'Done', 'code': 0}} from=::ffff:10.5.16.9,55928, flow_id=14e135cc, vmId=d2f0922c-97b2-43be-ad96-25595f3ecb87 (api:52)

2018-11-15 09:11:02,720+0000 INFO  (jsonrpc/2) [api.virt] START updateVmPolicy(params={u'ioTune': [{u'domainID': u'89f400d3-7d53-4116-b945-2fc223db78a9', u'guaranteed': {u'write_bytes_sec': 0, u'total_iops_sec': 0, u'read_iops_sec': 2900, u'read_bytes_sec': 0, u'write_iops_sec': 2000, u'total_bytes_sec': 0}, u'volumeID': u'2d980070-ae87-4d55-8168-bd401d639fad', u'maximum': {u'write_bytes_sec': 0, u'total_iops_sec': 0, u'read_iops_sec': 2900, u'read_bytes_sec': 0, u'write_iops_sec': 2000, u'total_bytes_sec': 0}, u'poolID': u'00000001-0001-0001-0001-000000000089', u'imageID': u'9b39f19e-5e3e-409b-8eec-2adb8c909284'}], u'vmId': u'7d441b7e-bca6-41b7-a112-7317cbb27fe3'}) from=::ffff:10.5.16.9,55928, flow_id=5ac61284, vmId=7d441b7e-bca6-41b7-a112-7317cbb27fe3 (api:46)
2018-11-15 09:11:02,726+0000 INFO  (jsonrpc/2) [api.virt] FINISH updateVmPolicy return={'status': {'message': 'Done', 'code': 0}} from=::ffff:10.5.16.9,55928, flow_id=5ac61284, vmId=7d441b7e-bca6-41b7-a112-7317cbb27fe3 (api:52)

only Warning in there at this time frame:
2018-11-15 09:11:06,527+0000 WARN  (qgapoller/3) [virt.periodic.VmDispatcher] could not run <function <lambda> at 0x7f349c15ce60> on ['34a069f6-dae3-4814-ab07-26dc20279f40', '7d441b7e-bca6-41b7-a112-7317cbb27fe3', 'd2f0922c-97b2-43be-ad96-25595f3ecb87', '70297d53-3470-4c0e-81d7-d36be7626bf5', 'a9bdd915-9fe2-451a-b203-fdccb1a30354', '7b9f30c5-29dc-42f8-8726-752e67d0de19'] (periodic:323)