[ovirt-users] Re: Useless disk statistics API

On Wed, Jun 13, 2018 at 9:53 AM, Hari Prasanth Loganathan <hariprasanth.l@ msystechnologies.com> wrote: > Hi Yedidyah, > > > *I tried running the 'dd if=/dev/zero of=/root/hari/test' and I received > the following output in VM oVirt console and meanwhile I checked this API > https://172.30.60.42/ovirt-engine/api/disks/f78c8adf-23f9-4f52-a29b-0de3d... > <https://172.30.60.42/ovirt-engine/api/disks/f78c8adf-23f9-4f52-a29b-0de3d... > and the value is received as '0' always * > > > *where, * > * f78c8adf-23f9-4f52-a29b-0de3d844652e - disk ID attached to that VM* > > > > > > *Anything wrong? * > You only wrote 300 MB, are you sure it was enough to cause an actual write (and not cached)? Did you check vmstat/iostat? Perhaps try reading instead of writing. dd if=/dev/somedev of=/dev/null > > *Thanks,* > > *Hari * > > > > > > > On Wed, Jun 13, 2018 at 11:56 AM, Yedidyah Bar David <didi(a)redhat.com&gt; > wrote: > >> On Wed, Jun 13, 2018 at 8:45 AM, Hari Prasanth Loganathan >> <hariprasanth.l(a)msystechnologies.com&gt; wrote: >> > Hi Yedidyah, >> > >> > Thanks for your response. I also tried creating the file, writing some >> > content to the VM guest console. Still, I didn't see any increase in >> the >> > values, It is always 0. >> >> Not sure I understand. "Creating the file" - which one? >> >> Perhaps try something like: >> >> dd if=/dev/zero of=/root/myfile1 >> >> In any case, please test that the OS sees your IO. Use e.g. vmstat, >> iostat >> or something like that. oVirt (and metrics) will only show what the OS >> reports - if you see there '0', that's what you should get in metrics. >> >> Best regards, >> >> > >> > >> > >> > On Wed, Jun 13, 2018 at 10:58 AM, Yedidyah Bar David <didi(a)redhat.com&gt; >> > wrote: >> >> >> >> On Tue, Jun 12, 2018 at 1:24 PM, Hari Prasanth Loganathan >> >> <hariprasanth.l(a)msystechnologies.com&gt; wrote: >> >> > Hi Team, >> >> > >> >> > I use the following API to get the disk statistics as per the oVirt >> rest >> >> > API >> >> > documentation. >> >> > >> >> > >> >> > http://ovirt.github.io/ovirt-engine-api-model/4.2/#types/dis >> k/links/statistics >> >> > >> >> > >> >> > >> >> > https://172.30.X.X/ovirt-engine/api/disks/f78c8adf-23f9-4f52 >> -a29b-0de3d844652e/statistics >> >> > >> >> > >> >> > { >> >> > "statistic": [ >> >> > { >> >> > "kind": "gauge", >> >> > "type": "decimal", >> >> > "unit": "bytes_per_second", >> >> > "values": { >> >> > "value": [ >> >> > { >> >> > "datum": 0 >> >> > } >> >> > ] >> >> > }, >> >> > "disk": { >> >> > "href": "/ovirt-engine/api/disks/f78c8 >> adf-23f9-4f52-a29b-0de3d844652e", >> >> > "id": "f78c8adf-23f9-4f52-a29b-0de3d844652e" >> >> > }, >> >> > "name": "data.current.read", >> >> > "description": "Read data rate", >> >> > "href": >> >> > >> >> > "/ovirt-engine/api/disks/f78c8adf-23f9-4f52-a29b-0de3d844652 >> e/statistics/33b9212b-f9cb-3fd0-b364-248fb61e1272", >> >> > "id": "33b9212b-f9cb-3fd0-b364-248fb61e1272" >> >> > }, >> >> > { >> >> > "kind": "gauge", >> >> > "type": "decimal", >> >> > "unit": "bytes_per_second", >> >> > "values": { >> >> > "value": [ >> >> > { >> >> > "datum": 0 >> >> > } >> >> > ] >> >> > }, >> >> > "disk": { >> >> > "href": "/ovirt-engine/api/disks/f78c8 >> adf-23f9-4f52-a29b-0de3d844652e", >> >> > "id": "f78c8adf-23f9-4f52-a29b-0de3d844652e" >> >> > }, >> >> > "name": "data.current.write", >> >> > "description": "Write data rate", >> >> > "href": >> >> > >> >> > "/ovirt-engine/api/disks/f78c8adf-23f9-4f52-a29b-0de3d844652 >> e/statistics/2f23addd-4ebd-3d82-a449-c28778bc33eb", >> >> > "id": "2f23addd-4ebd-3d82-a449-c28778bc33eb" >> >> > } >> >> > ] >> >> > } >> >> > >> >> > >> >> > Unfortunately, the values are always coming as '0'. >> >> > >> >> > Steps to reproduce : >> >> > >> >> > 1) I logged into the VM console and run the following command to >> copy >> >> > the >> >> > file and I see the write rate is 300mb/sec >> >> > >> >> > dd if=/dev/zero of=/dev/null >> >> >> >> This command does not access the disk. Perhaps try to read or write to >> >> one, then check stats. >> >> >> >> Best regards, >> >> >> >> > >> >> > 2) During this time, I am trying to execute this API and receiving >> as 0 >> >> > always. >> >> > >> >> > Is this API useless? >> >> > >> >> > Thanks, >> >> > Hari >> >> > >> >> > _______________________________________________ >> >> > Users mailing list -- users(a)ovirt.org >> >> > To unsubscribe send an email to users-leave(a)ovirt.org >> >> > Privacy Statement: https://www.ovirt.org/site/privacy-policy/ >> >> > oVirt Code of Conduct: >> >> > https://www.ovirt.org/community/about/community-guidelines/ >> >> > List Archives: >> >> > >> >> > https://lists.ovirt.org/archives/list/users@ovirt.org/messag >> e/7TGIUQ2REOMSTJBGD3OPY5RE2KOSSFWM/ >> >> > >> >> >> >> >> >> >> >> -- >> >> Didi >> > >> > >> >> >> >> -- >> Didi >> > > -- Didi