subject:"\[ovirt\-users\] Re\: Useless disk statistics API"

[ovirt-users] Re: Useless disk statistics API

2018-06-13 Thread Yedidyah Bar David

On Wed, Jun 13, 2018 at 12:20 PM, Hari Prasanth Loganathan <
hariprasant...@msystechnologies.com> wrote:

> Hi Yedidyah,
>
> Could you check the following read with *vmstat* operation, check the
> complete image.
>
>
>
>
That's better, but please run them in parallel.
Open two windows, run 'vmstat 1' in one of them, see that you get
close-to-zero
'bi', then run 'dd' in the other, see that 'bi' gets higher, wait a few
minutes,
then check oVirt metrics.

Thanks and good luck,


>
> On Wed, Jun 13, 2018 at 1:48 PM, Yedidyah Bar David 
> 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 
>>> 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
> 
> 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 
> wrote:
>
>> On Wed, Jun 13, 2018 at 8:45 AM, Hari Prasanth Loganathan
>>  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
>> >>  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":

[ovirt-users] Re: Useless disk statistics API

2018-06-13 Thread Hari Prasanth Loganathan

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  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 
>> 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
 
 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 
 wrote:

> On Wed, Jun 13, 2018 at 8:45 AM, Hari Prasanth Loganathan
>  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
> >>  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
>

[ovirt-users] Re: Useless disk statistics API

2018-06-13 Thread Yedidyah Bar David

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 
> 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
>>> 
>>> 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 
>>> wrote:
>>>
 On Wed, Jun 13, 2018 at 8:45 AM, Hari Prasanth Loganathan
  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 >>> >
 > wrote:
 >>
 >> On Tue, Jun 12, 2018 at 1:24 PM, Hari Prasanth Loganathan
 >>  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

[ovirt-users] Re: Useless disk statistics API

2018-06-13 Thread Hari Prasanth Loganathan

Hi Yedidyah,

I tried the read also, same result 0,




On Wed, Jun 13, 2018 at 12:54 PM, Yedidyah Bar David 
wrote:

> On Wed, Jun 13, 2018 at 9:53 AM, Hari Prasanth Loganathan  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 
>> wrote:
>>
>>> On Wed, Jun 13, 2018 at 8:45 AM, Hari Prasanth Loganathan
>>>  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 
>>> > wrote:
>>> >>
>>> >> On Tue, Jun 12, 2018 at 1:24 PM, Hari Prasanth Loganathan
>>> >>  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
>>> >
>>> >

[ovirt-users] Re: Useless disk statistics API

2018-06-13 Thread Yedidyah Bar David

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
> 
> 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 
> wrote:
>
>> On Wed, Jun 13, 2018 at 8:45 AM, Hari Prasanth Loganathan
>>  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 
>> > wrote:
>> >>
>> >> On Tue, Jun 12, 2018 at 1:24 PM, Hari Prasanth Loganathan
>> >>  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/f78c8adf-23f9-4f52-a29b-0de3d844652
>> e",
>> >> > "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/f78c8adf-23f9-4f52-a29b-0de3d844652
>> e",
>> >> > "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
___
Users mailing list -- users@ovirt.org
To unsubscribe send an email to users-le...@ovirt.org
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[ovirt-users] Re: Useless disk statistics API

2018-06-13 Thread Hari Prasanth Loganathan

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?  *

*Thanks,*

*Hari *






On Wed, Jun 13, 2018 at 11:56 AM, Yedidyah Bar David 
wrote:

> On Wed, Jun 13, 2018 at 8:45 AM, Hari Prasanth Loganathan
>  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 
> > wrote:
> >>
> >> On Tue, Jun 12, 2018 at 1:24 PM, Hari Prasanth Loganathan
> >>  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
> >> >
> >> > ___
> >> > 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/message/
> 7TGIUQ2REOMSTJBGD3OPY5RE2KOSSFWM/
> >> >
> >>
> >>
> >>
> >> --
> >> Didi
> >
> >
>
>
>
> --
> Didi
>
___
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/
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[ovirt-users] Re: Useless disk statistics API

2018-06-13 Thread Yedidyah Bar David

On Wed, Jun 13, 2018 at 8:45 AM, Hari Prasanth Loganathan
 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 
> wrote:
>>
>> On Tue, Jun 12, 2018 at 1:24 PM, Hari Prasanth Loganathan
>>  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
>> >
>> > ___
>> > 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/message/7TGIUQ2REOMSTJBGD3OPY5RE2KOSSFWM/
>> >
>>
>>
>>
>> --
>> Didi
>
>



-- 
Didi
___
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/
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[ovirt-users] Re: Useless disk statistics API

2018-06-12 Thread Hari Prasanth Loganathan

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.



On Wed, Jun 13, 2018 at 10:58 AM, Yedidyah Bar David 
wrote:

> On Tue, Jun 12, 2018 at 1:24 PM, Hari Prasanth Loganathan
>  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
> >
> > ___
> > 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/message/
> 7TGIUQ2REOMSTJBGD3OPY5RE2KOSSFWM/
> >
>
>
>
> --
> Didi
>
___
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[ovirt-users] Re: Useless disk statistics API

2018-06-12 Thread Yedidyah Bar David

On Tue, Jun 12, 2018 at 1:24 PM, Hari Prasanth Loganathan
 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
>
> ___
> Users mailing list -- users@ovirt.org
> To unsubscribe send an email to users-le...@ovirt.org
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[ovirt-users] Re: Useless disk statistics API

[ovirt-users] Re: Useless disk statistics API

[ovirt-users] Re: Useless disk statistics API

[ovirt-users] Re: Useless disk statistics API

[ovirt-users] Re: Useless disk statistics API

[ovirt-users] Re: Useless disk statistics API

[ovirt-users] Re: Useless disk statistics API

[ovirt-users] Re: Useless disk statistics API

[ovirt-users] Re: Useless disk statistics API

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