How to test disk IOPS using the same preflight checks as kURL installer

Supporting your customers
1
  • Download and extract the latest preflight binary from GitHub’s releases page.
  • Save the following YAML to host-preflight.yaml 
apiVersion: troubleshoot.sh/v1beta2
kind: HostPreflight
metadata:
  name: kurl-builtin
spec:
  collectors:
    - filesystemPerformance:
        collectorName: Filesystem Latency Two Minute Benchmark
        timeout: 2m
        directory: /var/lib/etcd
        fileSize: 22Mi
        operationSizeBytes: 2300
        datasync: true
        enableBackgroundIOPS: true
        backgroundIOPSWarmupSeconds: 10
        backgroundWriteIOPS: 300
        backgroundWriteIOPSJobs: 6
        backgroundReadIOPS: 50
        backgroundReadIOPSJobs: 1

  analyzers:
    - filesystemPerformance:
        collectorName: Filesystem Latency Two Minute Benchmark
        outcomes:
          - pass:
              when: "p99 < 10ms"
              message: "Write latency is ok (p99 target < 10ms, actual: {{ .P99 }})"
          - warn:
              when: "p99 < 20ms"
              message: "Write latency is high. p99 target < 10ms, actual:{{ .String }}"
          - fail:
              when: "p99 >= 20ms"
              message: "Write latency is too high. p99 target < 10ms, actual:{{ .String }}"
  • Run the following command as root:
    ./preflight --interactive=false host-preflight.yaml

Example output:

[Filesystem Latency Two Minute Benchmark] Running collector...
[CPU Info] Running collector...
[Amount of Memory] Running collector...

   --- FAIL: Filesystem Performance
      --- Write latency is too high. p99 target < 10ms, actual:
   Min: 1.06734ms
   Max: 980.047944ms
   Avg: 6.745206ms
    p1: 1.219405ms
    p5: 1.306124ms
   p10: 1.357343ms
   p20: 1.434213ms
   p30: 1.504088ms
   p40: 1.595145ms
   p50: 1.841983ms
   p60: 3.206616ms
   p70: 3.321259ms
   p80: 3.437754ms
   p90: 5.868105ms
   p95: 56.351534ms
   p99: 62.237159ms
 p99.5: 65.849002ms
 p99.9: 74.431154ms
p99.95: 120.162862ms
p99.99: 917.47506ms
--- FAIL   kurl-builtin
FAILED