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Disk Statistics

Disk Statistics

Plugin: proc.plugin Module: /proc/diskstats


Detailed statistics for each of your system’s disk devices and partitions. The data is reported by the kernel and can be used to monitor disk activity on a Linux system.

Get valuable insight into how your disks are performing and where potential bottlenecks might be.

This collector is supported on all platforms.

This collector supports collecting metrics from multiple instances of this integration, including remote instances.

Default Behavior


This integration doesn’t support auto-detection.


The default configuration for this integration does not impose any limits on data collection.

Performance Impact

The default configuration for this integration is not expected to impose a significant performance impact on the system.



No action required.



There is no configuration file.


There are no configuration options.


There are no configuration examples.


Metrics grouped by scope.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.

Per Disk Statistics instance

This scope has no labels.


Metric Dimensions Unit
system.io in, out KiB/s

Per disk


Label Description
device TBD
mount_point TBD
device_type TBD


Metric Dimensions Unit
disk.io reads, writes KiB/s
disk_ext.io discards KiB/s
disk.ops reads, writes operations/s
disk_ext.ops discards, flushes operations/s
disk.qops operations operations
disk.backlog backlog milliseconds
disk.busy busy milliseconds
disk.util utilization % of time working
disk.mops reads, writes merged operations/s
disk_ext.mops discards merged operations/s
disk.iotime reads, writes milliseconds/s
disk_ext.iotime discards, flushes milliseconds/s
disk.await reads, writes milliseconds/operation
disk_ext.await discards, flushes milliseconds/operation
disk.avgsz reads, writes KiB/operation
disk_ext.avgsz discards KiB/operation
disk.svctm svctm milliseconds/operation
disk.bcache_cache_alloc ununsed, dirty, clean, metadata, undefined percentage
disk.bcache_hit_ratio 5min, 1hour, 1day, ever percentage
disk.bcache_rates congested, writeback KiB/s
disk.bcache_size dirty MiB
disk.bcache_usage avail percentage
disk.bcache_cache_read_races races, errors operations/s
disk.bcache hits, misses, collisions, readaheads operations/s
disk.bcache_bypass hits, misses operations/s


The following alerts are available:

Alert name On metric Description
10min_disk_backlog disk.backlog average backlog size of the ${label:device} disk over the last 10 minutes
10min_disk_utilization disk.util average percentage of time ${label:device} disk was busy over the last 10 minutes
bcache_cache_dirty disk.bcache_cache_alloc percentage of cache space used for dirty data and metadata (this usually means your SSD cache is too small)
bcache_cache_errors disk.bcache_cache_read_races number of times data was read from the cache, the bucket was reused and invalidated in the last 10 minutes (when this occurs the data is reread from the backing device)

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