Hi Yedidyah,

I tried the read also, same result 0,

On Wed, Jun 13, 2018 at 12:54 PM, Yedidyah Bar David <didi@redhat.com> wrote:

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-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 <didi@redhat.com> wrote:

On Wed, Jun 13, 2018 at 8:45 AM, Hari Prasanth Loganathan
<hariprasanth.l@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 <didi@redhat.com>
> wrote:
>>
>> On Tue, Jun 12, 2018 at 1:24 PM, Hari Prasanth Loganathan
>> <hariprasanth.l@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/disk/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/f78c8adf-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-0de3d844652e/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/f78c8adf-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-0de3d844652e/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
>> >
>> > _______________________________________________
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>> > Privacy Statement: https://www.ovirt.org/site/privacy-policy/
>> > oVirt Code of Conduct:
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>> > List Archives:
>> >
>> > https://lists.ovirt.org/archives/list/users@ovirt.org/message/7TGIUQ2REOMSTJBGD3OPY5RE2KOSSFWM/
>> >
>>
>>
>>
>> --
>> Didi
>
>

--
Didi

--

Didi