4:18 a.m.
On Wed, Jun 13, 2018 at 10:43 AM, Hari Prasanth Loganathan <
hariprasanth.l(a)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
<didi(a)redhat.com>
wrote:
> On Wed, Jun 13, 2018 at 9:53 AM, Hari Prasanth Loganathan <
> hariprasanth.l(a)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>
>> wrote:
>>
>>> On Wed, Jun 13, 2018 at 8:45 AM, Hari Prasanth Loganathan
>>> <hariprasanth.l(a)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(a)redhat.com
>>> >
>>> > wrote:
>>> >>
>>> >> On Tue, Jun 12, 2018 at 1:24 PM, Hari Prasanth Loganathan
>>> >> <hariprasanth.l(a)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
>>> >> >
>>> >> > _______________________________________________
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>>> >> > 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
