This plugin gather disk statistics from /proc/diskstats (Linux 2.6+) or /proc/partitions (Linux 2.4) for the Snap telemetry framework.
- Linux (kernel 2.4, 2.6+)
You can get the pre-built binaries for your OS and architecture from the plugin's GitHub Releases page. Download the plugin from the latest release and load it into snapteld (/opt/snap/plugins is the default location for snap packages).
Fork https://github.com/intelsdi-x/snap-plugin-collector-disk
Clone repo into $GOPATH/src/github.com/intelsdi-x/:
$ git clone https://github.com/<yourGithubID>/snap-plugin-collector-disk.git
Build the snap disk plugin by running make within the cloned repo:
$ make
This builds the plugin in ./build/
- Set up the snap framework
- Load the plugin and create a task, see example in Examples.
Configuration parameters:
proc_path: path to 'diskstats' or 'partitions' file (default:/proc)
This collector gathers metrics from /proc/diskstats for kernel 2.6+, or from /proc/partitions for kernel 2.4. The configuration proc_path determines where the plugin obtains these metrics, with a default setting of /proc. This setting is only required to obtain data from a docker container that mounts the host /proc in an alternative path.
To read more about disk I/O statistics fields, please visit www.kernel.org/doc/Documentation/iostats.txt
This plugin has the ability to gather the following metrics:
Metric namespace is /intel/procfs/disk/<disk_device>/<metric_name> where <disk_device> expands to sda, sda1, sdb, sdb1 and so on.
| Metric namespace | Type | Description |
|---|---|---|
| /intel/procfs/disk/<disk_device>/merged_read | derive | The number of read operations per second that could be merged with already queued operations. |
| /intel/procfs/disk/<disk_device>/merged_write | derive | The number of write operations per second that could be merged with already queued operations. |
| /intel/procfs/disk/<disk_device>/octets_read | derive | The number of octets (bytes) read per second. |
| /intel/procfs/disk/<disk_device>/octets_write | derive | The number of octets (bytes) written per second. |
| /intel/procfs/disk/<disk_device>/ops_read | derive | The number of read operations per second. |
| /intel/procfs/disk/<disk_device>/ops_write | derive | The number of write operations per second. |
| /intel/procfs/disk/<disk_device>/time_read | derive | The average time for a read operation to complete in the last interval, in miliseconds. |
| /intel/procfs/disk/<disk_device>/time_write | derive | The average time for a write operation to complete in the last interval, in miliseconds. |
| /intel/procfs/disk/<disk_device>/io_time | derive | The time spent doing I/Os, in miliseconds. |
| /intel/procfs/disk/<disk_device>/weighted_io_time(1) | derive | The weighted time spent doing I/Os, in miliseconds. |
| /intel/procfs/disk/<disk_device>/pending_ops | gauge | The queue size of pending I/O operation. |
1) The value of metric weighted_io_time is incremented at each I/O start, I/O completion, I/O merge, or read of these stats by the number of I/Os in progress times the number of milliseconds spent doing I/O since the
last update of this field.
Data type of all above metrics is float64.
By default metrics are gathered once per second.
Example of running snap disk collector and writing data to file.
Ensure snap daemon is running:
- initd:
service snap-telemetry start - systemd:
systemctl start snap-telemetry - command line:
snapteld -l 1 -t 0 &
Download and load snap plugins:
$ wget http://snap.ci.snap-telemetry.io/plugins/snap-plugin-collector-disk/latest/linux/x86_64/snap-plugin-collector-disk
$ wget http://snap.ci.snap-telemetry.io/plugins/snap-plugin-publisher-file/latest/linux/x86_64/snap-plugin-publisher-file
$ chmod 755 snap-plugin-*
$ snaptel plugin load snap-plugin-collector-disk
$ snaptel plugin load snap-plugin-publisher-file
See all available metrics:
$ snaptel metric list
NAMESPACE VERSIONS
/intel/procfs/disk/*/io_time 3
/intel/procfs/disk/*/merged_read 3
/intel/procfs/disk/*/merged_write 3
/intel/procfs/disk/*/octets_read 3
/intel/procfs/disk/*/octets_write 3
/intel/procfs/disk/*/ops_read 3
/intel/procfs/disk/*/ops_write 3
/intel/procfs/disk/*/pending_ops 3
/intel/procfs/disk/*/time_read 3
/intel/procfs/disk/*/time_write 3
/intel/procfs/disk/*/weighted_io_time 3
Download an example task file and load it:
$ curl -sfLO https://raw.githubusercontent.com/intelsdi-x/snap-plugin-collector-disk/master/examples/tasks/diskstats-file.json
$ snaptel task create -t diskstats-file.json
Using task manifest to create task
Task created
ID: 480323af-15b0-4af8-a526-eb2ca6d8ae67
Name: Task-480323af-15b0-4af8-a526-eb2ca6d8ae67
State: Running
See realtime output from snaptel task watch <task_id> (CTRL+C to exit)
$ snaptel task watch 480323af-15b0-4af8-a526-eb2ca6d8ae67
Watching Task (480323af-15b0-4af8-a526-eb2ca6d8ae67):
NAMESPACE DATA TIMESTAMP SOURCE
/intel/procfs/disk/sda1/time_write 0 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sda1/weighted_io_time 0 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb/io_time 285.24017494599997 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb/merged_read 0 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb/merged_write 155.4955120365347 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb/octets_read 4.799664198069947e+06 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb/octets_write 2.0893468155700576e+08 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb/ops_read 0 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb/ops_write 338.722707748375 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb/pending_ops 0 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb/time_read 4.300686205 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb/time_write 121.47803869131272 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb/weighted_io_time 33117.57281195954 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb1/io_time 285.24017494599997 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb1/merged_read 0 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb1/merged_write 155.4955120365347 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb1/octets_read 4.799664198069947e+06 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb1/octets_write 2.0617126235076627e+08 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb1/ops_read 0 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
/intel/procfs/disk/sdb1/ops_write 338.722707748375 2015-12-23 11:18:09.224143712 -0500 EST gklab-108-166
This data is published to a file /tmp/published_diskstats per task specification
Stop task:
$ snaptel task stop 480323af-15b0-4af8-a526-eb2ca6d8ae67
Task stopped:
ID: 480323af-15b0-4af8-a526-eb2ca6d8ae67
There isn't a current roadmap for this plugin, but it is in active development. As we launch this plugin, we do not have any outstanding requirements for the next release.
If you have a feature request, please add it as an issue and/or submit a pull request.
This repository is one of many plugins in snap, a powerful telemetry framework. See the full project at http://github.com/intelsdi-x/snap.
To reach out to other users, head to the main framework or visit Slack.
We love contributions!
There's more than one way to give back, from examples to blogs to code updates. See our recommended process in CONTRIBUTING.md.
Snap, along with this plugin, is an Open Source software released under the Apache 2.0 License.
- Author: Izabella Raulin
Thank you! Your contribution is incredibly important to us.