Hi Yedidyah, Could you check the following read with *vmstat* operation, check the complete image.
On Wed, Jun 13, 2018 at 1:48 PM, Yedidyah Bar David <d...@redhat.com> wrote: > On Wed, Jun 13, 2018 at 10:43 AM, Hari Prasanth Loganathan < > hariprasant...@msystechnologies.com> wrote: > >> Hi Yedidyah, >> >> I tried the read also, same result 0, >> >> >> >> >> > You keep reading virtual devices that read only from the kernel/memory... > Please try reading from your disk. It's likely /dev/sda, or you can check > using e.g. 'df /', 'lsblk', etc. > > And please check with vmstat/iostat that you see the reads. If you don't, > try until you do. Only then check what oVirt has to say. > > Best regards, > > >> On Wed, Jun 13, 2018 at 12:54 PM, Yedidyah Bar David <d...@redhat.com> >> wrote: >> >>> On Wed, Jun 13, 2018 at 9:53 AM, Hari Prasanth Loganathan < >>> hariprasant...@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-0de3d844652e/statistics >>>> <https://172.30.60.42/ovirt-engine/api/disks/f78c8adf-23f9-4f52-a29b-0de3d844652e/statistics> >>>> 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 <d...@redhat.com> >>>> wrote: >>>> >>>>> On Wed, Jun 13, 2018 at 8:45 AM, Hari Prasanth Loganathan >>>>> <hariprasant...@msystechnologies.com> 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 < >>>>> d...@redhat.com> >>>>> > wrote: >>>>> >> >>>>> >> On Tue, Jun 12, 2018 at 1:24 PM, Hari Prasanth Loganathan >>>>> >> <hariprasant...@msystechnologies.com> 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@ovirt.org >>>>> >> > To unsubscribe send an email to users-le...@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 >>> >> >> > > > -- > Didi >
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