Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

get_io_stats fails to display IO statistics. #601

Open
sunilkumarn417 opened this issue Apr 18, 2024 · 3 comments
Open

get_io_stats fails to display IO statistics. #601

sunilkumarn417 opened this issue Apr 18, 2024 · 3 comments

Comments

@sunilkumarn417
Copy link

Get IO stats displays the IO metrics correctly when quried with active connected Gateway IP, else many metrics are "0" like bytes_written from other gateways.

Steps-to-follow:

  • Deploy service with gateways (GW1 : LB-grp-id: 1, GW2: LB-grp-id: 2)
  • Configure 2 subsystems
  • Add both gateway listeners on each subsystem.
  • Setup host, Add namespaces like below
    • Subsystem-1 Namespaces tagged with LB-grp-id-1
    • Subsystem-2 Namespaces tagged with LB-grp-id-2
  • Start IO.
  • Get IO stats for subsystem-1 namespaces from from GW2, then we can observe "bytes_written" will be "0"
root@ceph-sunilkumar-00-7v6gmf-node6 ~]# podman run --quiet --rm quay.io/barakda1/nvmeof-cli:1.2.1  --format json --server-address 10.0.208.84 --server-port 5500 get_subsystems
Get subsystems:
{
    "subsystems": [
        {
            "nqn": "nqn.2016-06.io.spdk:cnode1",
            "subtype": "NVMe",
            "listen_addresses": [
                {
                    "trtype": "TCP",
                    "adrfam": "IPv4",
                    "traddr": "10.0.208.84",
                    "trsvcid": "4420",
                    "transport": "TCP"
                }
            ],
            "allow_any_host": true,
            "serial_number": "Ceph67140833472324",
            "model_number": "Ceph bdev Controller",
            "max_namespaces": 32,
            "min_cntlid": 2041,
            "max_cntlid": 4080,
            "namespaces": [
                {
                    "nsid": 1,
                    "name": "bdev_e42aafab-8f9b-4911-b326-4308cc962112",
                    "bdev_name": "bdev_e42aafab-8f9b-4911-b326-4308cc962112",
                    "nguid": "E42AAFAB8F9B4911B3264308CC962112",
                    "uuid": "e42aafab-8f9b-4911-b326-4308cc962112",
                    "anagrpid": 2,
                    "nonce": "10.0.208.84:0/3145406409"
                },
                {
                    "nsid": 2,
                    "name": "bdev_b0f9bf47-925a-4bcb-8e93-3749a98d6e2f",
                    "bdev_name": "bdev_b0f9bf47-925a-4bcb-8e93-3749a98d6e2f",
                    "nguid": "B0F9BF47925A4BCB8E933749A98D6E2F",
                    "uuid": "b0f9bf47-925a-4bcb-8e93-3749a98d6e2f",
                    "anagrpid": 2,
                    "nonce": "10.0.208.84:0/3145406409"
                }
            ],
            "hosts": []
        },
        {
            "nqn": "nqn.2016-06.io.spdk:cnode2",
            "subtype": "NVMe",
            "listen_addresses": [
                {
                    "trtype": "TCP",
                    "adrfam": "IPv4",
                    "traddr": "10.0.208.84",
                    "trsvcid": "4420",
                    "transport": "TCP"
                }
            ],
            "allow_any_host": true,
            "serial_number": "Ceph5822363922143",
            "model_number": "Ceph bdev Controller",
            "max_namespaces": 32,
            "min_cntlid": 2041,
            "max_cntlid": 4080,
            "namespaces": [
                {
                    "nsid": 1,
                    "name": "bdev_e7721ff0-5d0e-4c9c-b703-6553aafc945a",
                    "bdev_name": "bdev_e7721ff0-5d0e-4c9c-b703-6553aafc945a",
                    "nguid": "E7721FF05D0E4C9CB7036553AAFC945A",
                    "uuid": "e7721ff0-5d0e-4c9c-b703-6553aafc945a",
                    "anagrpid": 1,
                    "nonce": "10.0.208.84:0/3359539278"
                },
                {
                    "nsid": 2,
                    "name": "bdev_35c56671-2204-42a9-9913-f51f77b65f60",
                    "bdev_name": "bdev_35c56671-2204-42a9-9913-f51f77b65f60",
                    "nguid": "35C56671220442A99913F51F77B65F60",
                    "uuid": "35c56671-2204-42a9-9913-f51f77b65f60",
                    "anagrpid": 1,
                    "nonce": "10.0.208.84:0/3359539278"
                }
            ],
            "hosts": []
        }
    ]
}

Listeners are added

[root@ceph-sunilkumar-00-7v6gmf-node6 ~]# podman run --quiet --rm quay.io/barakda1/nvmeof-cli:1.2.1  --format json --server-address 10.0.208.84 --server-port 5500 listener list -n nqn.2016-06.io.spdk:cnode2
{
    "error_message": "Success",
    "listeners": [
        {
            "host_name": "ceph-sunilkumar-00-7v6gmf-node6",
            "trtype": "TCP",
            "traddr": "10.0.208.84",
            "trsvcid": 4420,
            "adrfam": "ipv4"
        },
        {
            "host_name": "ceph-sunilkumar-00-7v6gmf-node7",
            "trtype": "TCP",
            "traddr": "10.0.209.23",
            "trsvcid": 4420,
            "adrfam": "ipv4"
        }
    ],
    "status": 0
}
[root@ceph-sunilkumar-00-7v6gmf-node6 ~]# podman run --quiet --rm quay.io/barakda1/nvmeof-cli:1.2.1  --format json --server-address 10.0.208.84 --server-port 5500 listener list -n nqn.2016-06.io.spdk:cnode1
{
    "error_message": "Success",
    "listeners": [
        {
            "host_name": "ceph-sunilkumar-00-7v6gmf-node6",
            "trtype": "TCP",
            "traddr": "10.0.208.84",
            "trsvcid": 4420,
            "adrfam": "ipv4"
        },
        {
            "host_name": "ceph-sunilkumar-00-7v6gmf-node7",
            "trtype": "TCP",
            "traddr": "10.0.209.23",
            "trsvcid": 4420,
            "adrfam": "ipv4"
        }
    ],
    "status": 0
}

Get IO stats

[root@ceph-sunilkumar-00-7v6gmf-node6 ~]# podman run --quiet --rm quay.io/barakda1/nvmeof-cli:1.2.1  --format json --server-address 10.0.208.84 --server-port 5500 namespace get_io_stats  --subsystem nqn.2016-06.io.spdk:cnode1 --nsid 1
{
    "error_message": "Success",
    "subsystem_nqn": "nqn.2016-06.io.spdk:cnode1",
    "nsid": 1,
    "uuid": "e42aafab-8f9b-4911-b326-4308cc962112",
    "bdev_name": "bdev_e42aafab-8f9b-4911-b326-4308cc962112",
    "tick_rate": "2290000000",
    "ticks": "2621647473989225",
    "bytes_read": "2183168",
    "num_read_ops": "102",
    "bytes_written": "113770496",
    "num_write_ops": "868",
    "read_latency_ticks": "127828488",
    "max_read_latency_ticks": "5130384",
    "min_read_latency_ticks": "570238",
    "write_latency_ticks": "238402928",
    "max_write_latency_ticks": "65301792",
    "min_write_latency_ticks": "79444",
    "status": 0,
    "bytes_unmapped": "0",
    "num_unmap_ops": "0",
    "unmap_latency_ticks": "0",
    "max_unmap_latency_ticks": "0",
    "min_unmap_latency_ticks": "0",
    "copy_latency_ticks": "0",
    "max_copy_latency_ticks": "0",
    "min_copy_latency_ticks": "0",
    "io_error": []
}

[root@ceph-sunilkumar-00-7v6gmf-node6 ~]# podman run --quiet --rm quay.io/barakda1/nvmeof-cli:1.2.1  --format json --server-address 10.0.209.23 --server-port 5500 namespace get_io_stats  --subsystem nqn.2016-06.io.spdk:cnode1 --nsid 1
{
    "error_message": "Success",
    "subsystem_nqn": "nqn.2016-06.io.spdk:cnode1",
    "nsid": 1,
    "uuid": "e42aafab-8f9b-4911-b326-4308cc962112",
    "bdev_name": "bdev_e42aafab-8f9b-4911-b326-4308cc962112",
    "tick_rate": "2190000000",
    "ticks": "2507761566245463",
    "bytes_read": "36864",
    "num_read_ops": "2",
    "read_latency_ticks": "8553886",
    "max_read_latency_ticks": "4332226",
    "min_read_latency_ticks": "4221660",
    "status": 0,
    "bytes_written": "0",
    "num_write_ops": "0",
    "bytes_unmapped": "0",
    "num_unmap_ops": "0",
    "write_latency_ticks": "0",
    "max_write_latency_ticks": "0",
    "min_write_latency_ticks": "0",
    "unmap_latency_ticks": "0",
    "max_unmap_latency_ticks": "0",
    "min_unmap_latency_ticks": "0",
    "copy_latency_ticks": "0",
    "max_copy_latency_ticks": "0",
    "min_copy_latency_ticks": "0",
    "io_error": []
}
@github-project-automation github-project-automation bot moved this to 🆕 New in NVMe-oF Apr 18, 2024
@pcuzner
Copy link
Contributor

pcuzner commented Apr 18, 2024

Why is this an issue? The stats come from the SPDK of the gateway, so if the namespace is not or has never been active on that gateway(spdk), then I would expect them to be 0's.

@sunilkumarn417 if this make sense, please close.

@sunilkumarn417
Copy link
Author

@pcuzner Thanks, I Understand that SPDK of the gateway provides this.

But the question is, As a user, which is the command to look on these metrics, on failover or no-failover?

@caroav
Copy link
Collaborator

caroav commented Apr 20, 2024

@sunilkumarn417 as a user, you need to check that the IO continues when one of the nodes is not available. There are means on the host to check if IO exists to namespaces.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
None yet
Projects
NVMe-oF
Status: 🆕 New
Milestone
No milestone
Development

No branches or pull requests
3 participants
@pcuzner @sunilkumarn417 @caroav