Hi Team,

Steps to reproduce :

1) Attach the disk to any VM

2) Perform some read and write operation in the VM which will increase the disk level - 'Read data rate / Write data rate / disk.read.latency / disk.write.latency'

3) Now when I bring down the VM, all the disk statistics needs to be zero But it is still retaining with last known value when the VM was in UP state.

Expected : All values should go to Zero

Actual : All values retains the last known values when the VM was in UP state.

Thanks,

Hari

On Tue, Jul 17, 2018 at 3:39 PM, Hari Prasanth Loganathan <hariprasanth.l@msystechnologies.com> wrote:

Hi Guys,

I think it is a serious issue, please let us know your thoughts?

On Tue, Jul 17, 2018 at 3:27 PM, Hari Prasanth Loganathan <hariprasanth.l@msystechnologies.com> wrote:

Hi Team,

We are using the following API to collect the disk statistics,

https://X.X.X.2/ovirt-engine/api/disks/2331bad7-71ec-4fad-95bb-2b3449f3dbda/statistics

I found one issue in the disk statistics. In case If the Virtual Machine has this disk (2331bad7-71ec-4fad-95bb-2b3449f3dbda) attached to it and I perform some read / write operation in the VM and it increases the corresponding disk level Read data rate / Write data rate / disk.read.latency / disk.write.latency.

Example, I received the following values for this disk, But the problem is even when I bring down the VM still the last known value is received continuously. Is it a known issue Or any workaround is available?

Expected : All values should go to Zero

Actual : All values retains the last known values when the VM was in UP state.

{
    "statistic": [
        {
            "kind": "gauge",
            "type": "decimal",
            "unit": "bytes_per_second",
            "values": {
                "value": [
                    {
                        "datum": 2184
                    }
                ]
            },
            "disk": {
                "href": "/ovirt-engine/api/disks/2331bad7-71ec-4fad-95bb-2b3449f3dbda",
                "id": "2331bad7-71ec-4fad-95bb-2b3449f3dbda"
            },
            "name": "data.current.read",
            "description": "Read data rate",
            "href": "/ovirt-engine/api/disks/2331bad7-71ec-4fad-95bb-2b3449f3dbda/statistics/33b9212b-f9cb-3fd0-b364-248fb61e1272",
            "id": "33b9212b-f9cb-3fd0-b364-248fb61e1272"
        },
        {
            "kind": "gauge",
            "type": "decimal",
            "unit": "bytes_per_second",
            "values": {
                "value": [
                    {
                        "datum": 41202005
                    }
                ]
            },
            "disk": {
                "href": "/ovirt-engine/api/disks/2331bad7-71ec-4fad-95bb-2b3449f3dbda",
                "id": "2331bad7-71ec-4fad-95bb-2b3449f3dbda"
            },
            "name": "data.current.write",
            "description": "Write data rate",
            "href": "/ovirt-engine/api/disks/2331bad7-71ec-4fad-95bb-2b3449f3dbda/statistics/2f23addd-4ebd-3d82-a449-c28778bc33eb",
            "id": "2f23addd-4ebd-3d82-a449-c28778bc33eb"
        },
        {
            "kind": "gauge",
            "type": "decimal",
            "unit": "seconds",
            "values": {
                "value": [
                    {
                        "datum": 0.12
                    }
                ]
            },
            "disk": {
                "href": "/ovirt-engine/api/disks/2331bad7-71ec-4fad-95bb-2b3449f3dbda",
                "id": "2331bad7-71ec-4fad-95bb-2b3449f3dbda"
            },
            "name": "disk.read.latency",
            "description": "Read latency",
            "href": "/ovirt-engine/api/disks/2331bad7-71ec-4fad-95bb-2b3449f3dbda/statistics/3a7b3f72-d035-3bb9-b196-e86a4eb34993",
            "id": "3a7b3f72-d035-3bb9-b196-e86a4eb34993"
        },
        {
            "kind": "gauge",
            "type": "decimal",
            "unit": "seconds",
            "values": {
                "value": [
                    {
                        "datum": 1.4
                    }
                ]
            },
            "disk": {
                "href": "/ovirt-engine/api/disks/2331bad7-71ec-4fad-95bb-2b3449f3dbda",
                "id": "2331bad7-71ec-4fad-95bb-2b3449f3dbda"
            },
            "name": "disk.write.latency",
            "description": "Write latency",
            "href": "/ovirt-engine/api/disks/2331bad7-71ec-4fad-95bb-2b3449f3dbda/statistics/b1e75c7b-cea4-37d2-8459-f7d68efc69a3",
            "id": "b1e75c7b-cea4-37d2-8459-f7d68efc69a3"
        },
        {
            "kind": "gauge",
            "type": "decimal",
            "unit": "seconds",
            "values": {
                "value": [
                    {
                        "datum": 0
                    }
                ]
            },
            "disk": {
                "href": "/ovirt-engine/api/disks/2331bad7-71ec-4fad-95bb-2b3449f3dbda",
                "id": "2331bad7-71ec-4fad-95bb-2b3449f3dbda"
            },
            "name": "disk.flush.latency",
            "description": "Flush latency",
            "href": "/ovirt-engine/api/disks/2331bad7-71ec-4fad-95bb-2b3449f3dbda/statistics/9c17ad7b-9ef1-3e8d-ad0a-ff8bee3925f0",
            "id": "9c17ad7b-9ef1-3e8d-ad0a-ff8bee3925f0"
        }
    ]
}

Thanks,

Hari