108 lines
4.6 KiB
Markdown
108 lines
4.6 KiB
Markdown
# Disk Input Plugin
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The disk input plugin gathers metrics about disk usage.
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Note that `used_percent` is calculated by doing `used / (used + free)`, _not_
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`used / total`, which is how the unix `df` command does it. See
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https://en.wikipedia.org/wiki/Df_(Unix) for more details.
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### Configuration:
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```
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# Read metrics about disk usage by mount point
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[[inputs.disk]]
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# By default, telegraf gather stats for all mountpoints.
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# Setting mountpoints will restrict the stats to the specified mountpoints.
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# mount_points = ["/"]
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```
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Additionally, the behavior of resolving the `mount_points` can be configured by using the `HOST_MOUNT_PREFIX` environment variable.
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When present, this variable is prepended to the mountpoints discovered by the plugin before retrieving stats.
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The prefix is stripped from the reported `path` in the measurement.
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This settings is useful when running `telegraf` inside a docker container to report host machine metrics.
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In this case, the host's root volume should be mounted into the container and the `HOST_MOUNT_PREFIX` and `HOST_ETC` environment variables set.
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`docker run -v /:/hostfs:ro -e HOST_MOUNT_PREFIX=/hostfs -e HOST_ETC=/hostfs/etc telegraf-docker`
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### Measurements & Fields:
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- disk
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- free (integer, bytes)
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- total (integer, bytes)
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- used (integer, bytes)
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- used_percent (float, percent)
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- inodes_free (integer, files)
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- inodes_total (integer, files)
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- inodes_used (integer, files)
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### Tags:
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- All measurements have the following tags:
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- fstype (filesystem type)
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- path (mount point path)
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### Example Output:
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```
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% ./telegraf --config ~/ws/telegraf.conf --input-filter disk --test
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* Plugin: disk, Collection 1
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> disk,fstype=hfs,path=/ free=398407520256i,inodes_free=97267461i,inodes_total=121847806i,inodes_used=24580345i,total=499088621568i,used=100418957312i,used_percent=20.131039916242397 1453832006274071563
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> disk,fstype=devfs,path=/dev free=0i,inodes_free=0i,inodes_total=628i,inodes_used=628i,total=185856i,used=185856i,used_percent=100 1453832006274137913
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> disk,fstype=autofs,path=/net free=0i,inodes_free=0i,inodes_total=0i,inodes_used=0i,total=0i,used=0i,used_percent=0 1453832006274157077
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> disk,fstype=autofs,path=/home free=0i,inodes_free=0i,inodes_total=0i,inodes_used=0i,total=0i,used=0i,used_percent=0 1453832006274169688
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```
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# DiskIO Input Plugin
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The diskio input plugin gathers metrics about disk traffic and timing.
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### Configuration:
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```
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# Read metrics about disk IO by device
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[[inputs.diskio]]
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## By default, telegraf will gather stats for all devices including
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## disk partitions.
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## Setting devices will restrict the stats to the specified devices.
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# devices = ["sda", "sdb"]
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## Uncomment the following line if you need disk serial numbers.
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# skip_serial_number = false
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```
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Data collection is based on github.com/shirou/gopsutil. This package handles platform dependencies and converts all timing information to milliseconds.
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### Measurements & Fields:
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- diskio
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- reads (integer, counter)
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- writes (integer, counter)
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- read_bytes (integer, bytes)
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- write_bytes (integer, bytes)
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- read_time (integer, milliseconds)
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- write_time (integer, milliseconds)
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- io_time (integer, milliseconds)
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- iops_in_progress (integer, counter) (since #2037, not yet in STABLE)
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### Tags:
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- All measurements have the following tags:
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- name (device name)
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- If configured to use serial numbers (default: disabled):
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- serial (device serial number)
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### Example Output:
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```
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% telegraf -config ~/.telegraf/telegraf.conf -input-filter diskio -test
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* Plugin: inputs.diskio, Collection 1
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> diskio,name=mmcblk1p2 io_time=244i,read_bytes=966656i,read_time=276i,reads=128i,write_bytes=0i,write_time=0i,writes=0i 1484916036000000000
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> diskio,name=mmcblk1boot1 io_time=264i,read_bytes=90112i,read_time=264i,reads=22i,write_bytes=0i,write_time=0i,writes=0i 1484916036000000000
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> diskio,name=mmcblk1boot0 io_time=212i,read_bytes=90112i,read_time=212i,reads=22i,write_bytes=0i,write_time=0i,writes=0i 1484916036000000000
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> diskio,name=mmcblk0 io_time=1855380i,read_bytes=135861248i,read_time=58484i,reads=4081i,write_bytes=364068864i,write_time=7128792i,writes=18019i 1484916036000000000
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> diskio,name=mmcblk0p1 io_time=1855256i,read_bytes=134915072i,read_time=58256i,reads=3958i,write_bytes=364068864i,write_time=7128792i,writes=18019i 1484916036000000000
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> diskio,name=mmcblk1 io_time=384i,read_bytes=2633728i,read_time=728i,reads=323i,write_bytes=0i,write_time=0i,writes=0i 1484916036000000000
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> diskio,name=mmcblk1p1 io_time=216i,read_bytes=860160i,read_time=288i,reads=106i,write_bytes=0i,write_time=0i,writes=0i 1484916036000000000
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```
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