ZFS Adaptive Replacement Cache
Plugin: proc.plugin Module: /proc/spl/kstat/zfs/arcstats
Overview
Monitor ZFS Adaptive Replacement Cache (ARC) performance and memory statistics.
This collector is supported on all platforms.
This collector supports collecting metrics from multiple instances of this integration.
Default Behavior
Auto-Detection
This integration doesn't support auto-detection.
Limits
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.
Setup
Prerequisites
No action required.
Configuration
Options
There are no configuration options.
via File
There is no configuration file.
Examples
There are no configuration examples.
Alerts
The following alerts are available:
| Alert name | On metric | Description |
|---|---|---|
| zfs_memory_throttle | zfs.memory_ops | number of times ZFS had to limit the ARC growth in the last 10 minutes |
Metrics
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 ZFS Adaptive Replacement Cache instance
This scope has no labels.
Metrics:
| Metric | Description | Dimensions | Unit |
|---|---|---|---|
| zfs.arc_size | ZFS ARC Size | arcsz, target, min, max | MiB |
| zfs.l2_size | ZFS L2 ARC Size | actual, size | MiB |
| zfs.reads | ZFS Reads | arc, demand, prefetch, metadata, l2 | reads/s |
| zfs.bytes | ZFS ARC L2 Read/Write Rate | read, write | KiB/s |
| zfs.hits | ZFS ARC Hits | hits, misses | percentage |
| zfs.hits_rate | ZFS ARC Hits Rate | hits, misses | events/s |
| zfs.dhits | ZFS Demand Hits | hits, misses | percentage |
| zfs.dhits_rate | ZFS Demand Hits Rate | hits, misses | events/s |
| zfs.phits | ZFS Prefetch Hits | hits, misses | percentage |
| zfs.phits_rate | ZFS Prefetch Hits Rate | hits, misses | events/s |
| zfs.mhits | ZFS Metadata Hits | hits, misses | percentage |
| zfs.mhits_rate | ZFS Metadata Hits Rate | hits, misses | events/s |
| zfs.l2hits | ZFS L2 Hits | hits, misses | percentage |
| zfs.l2hits_rate | ZFS L2 Hits Rate | hits, misses | events/s |
| zfs.list_hits | ZFS List Hits | mfu, mfu_ghost, mru, mru_ghost | hits/s |
| zfs.arc_size_breakdown | ZFS ARC Size Breakdown | recent, frequent | percentage |
| zfs.memory_ops | ZFS Memory Operations | direct, throttled, indirect | operations/s |
| zfs.important_ops | ZFS Important Operations | evict_skip, deleted, mutex_miss, hash_collisions | operations/s |
| zfs.actual_hits | ZFS Actual Cache Hits | hits, misses | percentage |
| zfs.actual_hits_rate | ZFS Actual Cache Hits Rate | hits, misses | events/s |
| zfs.demand_data_hits | ZFS Data Demand Efficiency | hits, misses | percentage |
| zfs.demand_data_hits_rate | ZFS Data Demand Efficiency Rate | hits, misses | events/s |
| zfs.prefetch_data_hits | ZFS Data Prefetch Efficiency | hits, misses | percentage |
| zfs.prefetch_data_hits_rate | ZFS Data Prefetch Efficiency Rate | hits, misses | events/s |
| zfs.hash_elements | ZFS ARC Hash Elements | current, max | elements |
| zfs.hash_chains | ZFS ARC Hash Chains | current, max | chains |
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