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/statisti...

https://172.30.X.X/ovirt-engine/api/disks/f78c8adf-23f9-4f52-a29b-0de3d84465...

{ "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-leave@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/7TGIUQ2REOMSTJ...

-- Didi

-- Didi

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-0de3d844... <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/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-leave@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

On Wed, Jun 13, 2018 at 10:43 AM, Hari Prasanth Loganathan < hariprasanth.l@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@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-0de3d844... <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:

...

...

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

On Wed, Jun 13, 2018 at 8:45 AM, Hari Prasanth Loganathan <hariprasanth.l@msystechnologies.com> wrote: 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/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-leave@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

On Wed, Jun 13, 2018 at 12:20 PM, Hari Prasanth Loganathan < hariprasanth.l@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 <didi@redhat.com> wrote:

...

On Wed, Jun 13, 2018 at 10:43 AM, Hari Prasanth Loganathan < hariprasanth.l@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@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-0de3d844... <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/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-leave@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

-- Didi