Leaseweb Fio Disk Tests
Leaseweb VPS 4 - Nov 06 2026

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Each fio test runs for 60 seconds using the libaio I/O engine, one job, and a queue depth of 32. Direct I/O is enabled (direct=1) and synchronous writes (O_SYNC) are disabled. Before each test, fio prepares a fresh file with sequential 1 MiB writes and a final fsync. The file is up to 40 GiB, reduced when disk space is limited to leave at least 1 GiB or 10% of available space free, whichever is larger. Preparation time is separate from the 60-second measurement, and the file is removed after each test.

Test IOPS Throughput (MB/s) Mean Latency (µs) p50 (µs) p95 (µs) p99 (µs)
Sequential write, 128 KiB 4006 525 7940 7963 8847 9110
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261105-63303-9bv4s0/fio.dat --size\=42949672960 --ioengine\=libaio --iodepth\=32 --numjobs\=1 --direct\=1 --sync\=0 --output-format\=json --name\=initialize --rw\=write --bs\=1M --refill_buffers\=1 --end_fsync\=1
Run Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261105-63303-9bv4s0/fio.dat --size\=42949672960 --ioengine\=libaio --iodepth\=32 --numjobs\=1 --direct\=1 --sync\=0 --output-format\=json --name\=sequential_write --rw\=write --bs\=131072 --runtime\=60 --time_based\=1 --allow_file_create\=0 --refill_buffers\=1 --lat_percentiles\=1 --percentile_list\=50:95:99
Raw Results
{
  "jobs": [
    {
      "ctx": 175034,
      "eta": 0,
      "majf": 0,
      "minf": 12,
      "read": {
        "bw": 0,
        "iops": 0.0,
        "bw_agg": 0.0,
        "bw_dev": 0.0,
        "bw_max": 0,
        "bw_min": 0,
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_mean": 0.0,
        "clat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "runtime": 0,
        "slat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_bytes": 0,
        "drop_ios": 0,
        "io_bytes": 0,
        "iops_max": 0,
        "iops_min": 0,
        "io_kbytes": 0,
        "iops_mean": 0.0,
        "short_ios": 0,
        "total_ios": 0,
        "bw_samples": 0,
        "iops_stddev": 0.0,
        "iops_samples": 0
      },
      "sync": {
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "total_ios": 0
      },
      "trim": {
        "bw": 0,
        "iops": 0.0,
        "bw_agg": 0.0,
        "bw_dev": 0.0,
        "bw_max": 0,
        "bw_min": 0,
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_mean": 0.0,
        "clat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "runtime": 0,
        "slat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_bytes": 0,
        "drop_ios": 0,
        "io_bytes": 0,
        "iops_max": 0,
        "iops_min": 0,
        "io_kbytes": 0,
        "iops_mean": 0.0,
        "short_ios": 0,
        "total_ios": 0,
        "bw_samples": 0,
        "iops_stddev": 0.0,
        "iops_samples": 0
      },
      "error": 0,
      "write": {
        "bw": 512823,
        "iops": 4006.432368,
        "bw_agg": 100.0,
        "bw_dev": 9361.099412,
        "bw_max": 613888,
        "bw_min": 507392,
        "lat_ns": {
          "N": 240422,
          "max": 16476807,
          "min": 978762,
          "mean": 7939696.898308,
          "stddev": 635907.982761,
          "percentile": {
            "50.000000": 7962624,
            "95.000000": 8847360,
            "99.000000": 9109504
          }
        },
        "bw_mean": 513211.159664,
        "clat_ns": {
          "N": 240422,
          "max": 16466056,
          "min": 897077,
          "mean": 7926503.667443,
          "stddev": 637474.424154,
          "percentile": {
            "50.000000": 7962624,
            "95.000000": 8847360,
            "99.000000": 9109504
          }
        },
        "runtime": 60009,
        "slat_ns": {
          "N": 240422,
          "max": 8001234,
          "min": 3677,
          "mean": 13193.230865,
          "stddev": 47727.725868
        },
        "bw_bytes": 525131103,
        "drop_ios": 0,
        "io_bytes": 31512592384,
        "iops_max": 4796,
        "iops_min": 3964,
        "io_kbytes": 30774016,
        "iops_mean": 4009.462185,
        "short_ios": 0,
        "total_ios": 240422,
        "bw_samples": 119,
        "iops_stddev": 73.133589,
        "iops_samples": 119
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "sequential_write",
      "sys_cpu": 7.399013,
      "usr_cpu": 18.825823,
      "job_start": 1793931666427,
      "latency_ms": {
        "2": 0.017885,
        "4": 0.337739,
        "10": 99.222201,
        "20": 0.421342,
        "50": 0.0,
        "100": 0.0,
        "250": 0.0,
        "500": 0.0,
        "750": 0.0,
        "1000": 0.0,
        "2000": 0.0,
        ">=2000": 0.0
      },
      "latency_ns": {
        "2": 0.0,
        "4": 0.0,
        "10": 0.0,
        "20": 0.0,
        "50": 0.0,
        "100": 0.0,
        "250": 0.0,
        "500": 0.0,
        "750": 0.0,
        "1000": 0.0
      },
      "latency_us": {
        "2": 0.0,
        "4": 0.0,
        "10": 0.0,
        "20": 0.0,
        "50": 0.0,
        "100": 0.0,
        "250": 0.0,
        "500": 0.0,
        "750": 0.0,
        "1000": 0.01
      },
      "job options": {
        "bs": "131072",
        "rw": "write",
        "name": "sequential_write",
        "runtime": "60",
        "time_based": "1",
        "refill_buffers": "1",
        "lat_percentiles": "1",
        "percentile_list": "50:95:99",
        "allow_file_create": "0"
      },
      "job_runtime": 60008,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.987106,
        ">=64": 0.0
      },
      "latency_depth": 32,
      "iodepth_submit": {
        "0": 0.0,
        "4": 100.0,
        "8": 0.0,
        "16": 0.0,
        "32": 0.0,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_target": 0,
      "latency_window": 0,
      "iodepth_complete": {
        "0": 0.0,
        "4": 99.999584,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Thu Nov  5 18:22:06 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 83.344454,
      "in_queue": 1896066,
      "read_ios": 0,
      "write_ios": 240170,
      "read_ticks": 0,
      "read_merges": 0,
      "write_ticks": 1896065,
      "read_sectors": 0,
      "write_merges": 24,
      "write_sectors": 61429312
    }
  ],
  "timestamp": 1793931726,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793931726472,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261105-63303-9bv4s0/fio.dat",
    "ioengine": "libaio"
  }
}
Sequential read, 128 KiB 4007 525 7985 8028 8585 8978
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261105-63303-sp32m5/fio.dat --size\=42949672960 --ioengine\=libaio --iodepth\=32 --numjobs\=1 --direct\=1 --sync\=0 --output-format\=json --name\=initialize --rw\=write --bs\=1M --refill_buffers\=1 --end_fsync\=1
Run Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261105-63303-sp32m5/fio.dat --size\=42949672960 --ioengine\=libaio --iodepth\=32 --numjobs\=1 --direct\=1 --sync\=0 --output-format\=json --name\=sequential_read --rw\=read --bs\=131072 --runtime\=60 --time_based\=1 --allow_file_create\=0 --refill_buffers\=1 --lat_percentiles\=1 --percentile_list\=50:95:99
Raw Results
{
  "jobs": [
    {
      "ctx": 84132,
      "eta": 0,
      "majf": 0,
      "minf": 1035,
      "read": {
        "bw": 512838,
        "iops": 4006.549018,
        "bw_agg": 100.0,
        "bw_dev": 9926.448357,
        "bw_max": 614144,
        "bw_min": 475648,
        "lat_ns": {
          "N": 240429,
          "max": 15985552,
          "min": 150153,
          "mean": 7985433.989743,
          "stddev": 527752.938849,
          "percentile": {
            "50.000000": 8028160,
            "95.000000": 8585216,
            "99.000000": 8978432
          }
        },
        "bw_mean": 512898.241667,
        "clat_ns": {
          "N": 240429,
          "max": 15981714,
          "min": 145384,
          "mean": 7975490.976496,
          "stddev": 530511.617768,
          "percentile": {
            "50.000000": 8028160,
            "95.000000": 8585216,
            "99.000000": 8978432
          }
        },
        "runtime": 60009,
        "slat_ns": {
          "N": 240429,
          "max": 2769690,
          "min": 3376,
          "mean": 9943.013247,
          "stddev": 11164.817387
        },
        "bw_bytes": 525146392,
        "drop_ios": 0,
        "io_bytes": 31513509888,
        "iops_max": 4798,
        "iops_min": 3716,
        "io_kbytes": 30774912,
        "iops_mean": 4007.016667,
        "short_ios": 0,
        "total_ios": 240429,
        "bw_samples": 120,
        "iops_stddev": 77.550741,
        "iops_samples": 120
      },
      "sync": {
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "total_ios": 0
      },
      "trim": {
        "bw": 0,
        "iops": 0.0,
        "bw_agg": 0.0,
        "bw_dev": 0.0,
        "bw_max": 0,
        "bw_min": 0,
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_mean": 0.0,
        "clat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "runtime": 0,
        "slat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_bytes": 0,
        "drop_ios": 0,
        "io_bytes": 0,
        "iops_max": 0,
        "iops_min": 0,
        "io_kbytes": 0,
        "iops_mean": 0.0,
        "short_ios": 0,
        "total_ios": 0,
        "bw_samples": 0,
        "iops_stddev": 0.0,
        "iops_samples": 0
      },
      "error": 0,
      "write": {
        "bw": 0,
        "iops": 0.0,
        "bw_agg": 0.0,
        "bw_dev": 0.0,
        "bw_max": 0,
        "bw_min": 0,
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_mean": 0.0,
        "clat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "runtime": 0,
        "slat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_bytes": 0,
        "drop_ios": 0,
        "io_bytes": 0,
        "iops_max": 0,
        "iops_min": 0,
        "io_kbytes": 0,
        "iops_mean": 0.0,
        "short_ios": 0,
        "total_ios": 0,
        "bw_samples": 0,
        "iops_stddev": 0.0,
        "iops_samples": 0
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "sequential_read",
      "sys_cpu": 5.129316,
      "usr_cpu": 1.089855,
      "job_start": 1793931523481,
      "latency_ms": {
        "2": 0.01,
        "4": 0.01,
        "10": 99.688889,
        "20": 0.11937,
        "50": 0.0,
        "100": 0.0,
        "250": 0.0,
        "500": 0.0,
        "750": 0.0,
        "1000": 0.0,
        "2000": 0.0,
        ">=2000": 0.0
      },
      "latency_ns": {
        "2": 0.0,
        "4": 0.0,
        "10": 0.0,
        "20": 0.0,
        "50": 0.0,
        "100": 0.0,
        "250": 0.0,
        "500": 0.0,
        "750": 0.0,
        "1000": 0.0
      },
      "latency_us": {
        "2": 0.0,
        "4": 0.0,
        "10": 0.0,
        "20": 0.0,
        "50": 0.0,
        "100": 0.0,
        "250": 0.018717,
        "500": 0.03369,
        "750": 0.126441,
        "1000": 0.01
      },
      "job options": {
        "bs": "131072",
        "rw": "read",
        "name": "sequential_read",
        "runtime": "60",
        "time_based": "1",
        "refill_buffers": "1",
        "lat_percentiles": "1",
        "percentile_list": "50:95:99",
        "allow_file_create": "0"
      },
      "job_runtime": 60008,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.987106,
        ">=64": 0.0
      },
      "latency_depth": 32,
      "iodepth_submit": {
        "0": 0.0,
        "4": 100.0,
        "8": 0.0,
        "16": 0.0,
        "32": 0.0,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_target": 0,
      "latency_window": 0,
      "iodepth_complete": {
        "0": 0.0,
        "4": 99.999584,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Thu Nov  5 18:19:43 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 99.189351,
      "in_queue": 1910370,
      "read_ios": 239970,
      "write_ios": 236,
      "read_ticks": 1910268,
      "read_merges": 0,
      "write_ticks": 102,
      "read_sectors": 61432072,
      "write_merges": 37,
      "write_sectors": 2352
    }
  ],
  "timestamp": 1793931583,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793931583625,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261105-63303-sp32m5/fio.dat",
    "ioengine": "libaio"
  }
}
Random write, 4 KiB 21421 88 1491 1516 1843 2343
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261105-63303-zavjlw/fio.dat --size\=42949672960 --ioengine\=libaio --iodepth\=32 --numjobs\=1 --direct\=1 --sync\=0 --output-format\=json --name\=initialize --rw\=write --bs\=1M --refill_buffers\=1 --end_fsync\=1
Run Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261105-63303-zavjlw/fio.dat --size\=42949672960 --ioengine\=libaio --iodepth\=32 --numjobs\=1 --direct\=1 --sync\=0 --output-format\=json --name\=random_write --rw\=randwrite --bs\=4096 --runtime\=60 --time_based\=1 --allow_file_create\=0 --refill_buffers\=1 --lat_percentiles\=1 --percentile_list\=50:95:99
Raw Results
{
  "jobs": [
    {
      "ctx": 123047,
      "eta": 0,
      "majf": 0,
      "minf": 9,
      "read": {
        "bw": 0,
        "iops": 0.0,
        "bw_agg": 0.0,
        "bw_dev": 0.0,
        "bw_max": 0,
        "bw_min": 0,
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_mean": 0.0,
        "clat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "runtime": 0,
        "slat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_bytes": 0,
        "drop_ios": 0,
        "io_bytes": 0,
        "iops_max": 0,
        "iops_min": 0,
        "io_kbytes": 0,
        "iops_mean": 0.0,
        "short_ios": 0,
        "total_ios": 0,
        "bw_samples": 0,
        "iops_stddev": 0.0,
        "iops_samples": 0
      },
      "sync": {
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "total_ios": 0
      },
      "trim": {
        "bw": 0,
        "iops": 0.0,
        "bw_agg": 0.0,
        "bw_dev": 0.0,
        "bw_max": 0,
        "bw_min": 0,
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_mean": 0.0,
        "clat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "runtime": 0,
        "slat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_bytes": 0,
        "drop_ios": 0,
        "io_bytes": 0,
        "iops_max": 0,
        "iops_min": 0,
        "io_kbytes": 0,
        "iops_mean": 0.0,
        "short_ios": 0,
        "total_ios": 0,
        "bw_samples": 0,
        "iops_stddev": 0.0,
        "iops_samples": 0
      },
      "error": 0,
      "write": {
        "bw": 85682,
        "iops": 21420.569314,
        "bw_agg": 100.0,
        "bw_dev": 2754.440465,
        "bw_max": 90784,
        "bw_min": 77408,
        "lat_ns": {
          "N": 1285277,
          "max": 5994842,
          "min": 172507,
          "mean": 1491124.406282,
          "stddev": 336310.596709,
          "percentile": {
            "50.000000": 1515520,
            "95.000000": 1843200,
            "99.000000": 2342912
          }
        },
        "bw_mean": 85764.705882,
        "clat_ns": {
          "N": 1285277,
          "max": 5993169,
          "min": 151105,
          "mean": 1487496.956997,
          "stddev": 338044.337971,
          "percentile": {
            "50.000000": 1515520,
            "95.000000": 1843200,
            "99.000000": 2342912
          }
        },
        "runtime": 60002,
        "slat_ns": {
          "N": 1285277,
          "max": 3528736,
          "min": 1583,
          "mean": 3627.449285,
          "stddev": 7983.227909
        },
        "bw_bytes": 87738651,
        "drop_ios": 0,
        "io_bytes": 5264494592,
        "iops_max": 22696,
        "iops_min": 19352,
        "io_kbytes": 5141108,
        "iops_mean": 21441.193277,
        "short_ios": 0,
        "total_ios": 1285277,
        "bw_samples": 119,
        "iops_stddev": 688.596623,
        "iops_samples": 119
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "random_write",
      "sys_cpu": 9.088182,
      "usr_cpu": 7.874869,
      "job_start": 1793931380402,
      "latency_ms": {
        "2": 88.378225,
        "4": 3.059263,
        "10": 0.114683,
        "20": 0.0,
        "50": 0.0,
        "100": 0.0,
        "250": 0.0,
        "500": 0.0,
        "750": 0.0,
        "1000": 0.0,
        "2000": 0.0,
        ">=2000": 0.0
      },
      "latency_ns": {
        "2": 0.0,
        "4": 0.0,
        "10": 0.0,
        "20": 0.0,
        "50": 0.0,
        "100": 0.0,
        "250": 0.0,
        "500": 0.0,
        "750": 0.0,
        "1000": 0.0
      },
      "latency_us": {
        "2": 0.0,
        "4": 0.0,
        "10": 0.0,
        "20": 0.0,
        "50": 0.0,
        "100": 0.0,
        "250": 0.207115,
        "500": 2.587302,
        "750": 2.995463,
        "1000": 2.657948
      },
      "job options": {
        "bs": "4096",
        "rw": "randwrite",
        "name": "random_write",
        "runtime": "60",
        "time_based": "1",
        "refill_buffers": "1",
        "lat_percentiles": "1",
        "percentile_list": "50:95:99",
        "allow_file_create": "0"
      },
      "job_runtime": 60001,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.997588,
        ">=64": 0.0
      },
      "latency_depth": 32,
      "iodepth_submit": {
        "0": 0.0,
        "4": 100.0,
        "8": 0.0,
        "16": 0.0,
        "32": 0.0,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_target": 0,
      "latency_window": 0,
      "iodepth_complete": {
        "0": 0.0,
        "4": 99.999922,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Thu Nov  5 18:17:20 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 86.663553,
      "in_queue": 1767782,
      "read_ios": 0,
      "write_ios": 1283235,
      "read_ticks": 0,
      "read_merges": 0,
      "write_ticks": 1767782,
      "read_sectors": 0,
      "write_merges": 32,
      "write_sectors": 10266280
    }
  ],
  "timestamp": 1793931440,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793931440442,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261105-63303-zavjlw/fio.dat",
    "ioengine": "libaio"
  }
}
Random read, 4 KiB 25041 103 1277 1319 1565 1909
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261105-63303-hkq5vj/fio.dat --size\=42949672960 --ioengine\=libaio --iodepth\=32 --numjobs\=1 --direct\=1 --sync\=0 --output-format\=json --name\=initialize --rw\=write --bs\=1M --refill_buffers\=1 --end_fsync\=1
Run Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261105-63303-hkq5vj/fio.dat --size\=42949672960 --ioengine\=libaio --iodepth\=32 --numjobs\=1 --direct\=1 --sync\=0 --output-format\=json --name\=random_read --rw\=randread --bs\=4096 --runtime\=60 --time_based\=1 --allow_file_create\=0 --refill_buffers\=1 --lat_percentiles\=1 --percentile_list\=50:95:99
Raw Results
{
  "jobs": [
    {
      "ctx": 231606,
      "eta": 0,
      "majf": 0,
      "minf": 45,
      "read": {
        "bw": 100162,
        "iops": 25040.714631,
        "bw_agg": 100.0,
        "bw_dev": 1832.666677,
        "bw_max": 120016,
        "bw_min": 99856,
        "lat_ns": {
          "N": 1502518,
          "max": 5795454,
          "min": 81244,
          "mean": 1277070.659346,
          "stddev": 316445.634294,
          "percentile": {
            "50.000000": 1318912,
            "95.000000": 1564672,
            "99.000000": 1908736
          }
        },
        "bw_mean": 100221.310924,
        "clat_ns": {
          "N": 1502518,
          "max": 5790104,
          "min": 79641,
          "mean": 1272358.574049,
          "stddev": 318039.115615,
          "percentile": {
            "50.000000": 1318912,
            "95.000000": 1548288,
            "99.000000": 1908736
          }
        },
        "runtime": 60003,
        "slat_ns": {
          "N": 1502518,
          "max": 3362251,
          "min": 1443,
          "mean": 4712.085297,
          "stddev": 7345.190402
        },
        "bw_bytes": 102566767,
        "drop_ios": 0,
        "io_bytes": 6154313728,
        "iops_max": 30004,
        "iops_min": 24964,
        "io_kbytes": 6010072,
        "iops_mean": 25055.378151,
        "short_ios": 0,
        "total_ios": 1502518,
        "bw_samples": 119,
        "iops_stddev": 458.162339,
        "iops_samples": 119
      },
      "sync": {
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "total_ios": 0
      },
      "trim": {
        "bw": 0,
        "iops": 0.0,
        "bw_agg": 0.0,
        "bw_dev": 0.0,
        "bw_max": 0,
        "bw_min": 0,
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_mean": 0.0,
        "clat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "runtime": 0,
        "slat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_bytes": 0,
        "drop_ios": 0,
        "io_bytes": 0,
        "iops_max": 0,
        "iops_min": 0,
        "io_kbytes": 0,
        "iops_mean": 0.0,
        "short_ios": 0,
        "total_ios": 0,
        "bw_samples": 0,
        "iops_stddev": 0.0,
        "iops_samples": 0
      },
      "error": 0,
      "write": {
        "bw": 0,
        "iops": 0.0,
        "bw_agg": 0.0,
        "bw_dev": 0.0,
        "bw_max": 0,
        "bw_min": 0,
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_mean": 0.0,
        "clat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "runtime": 0,
        "slat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_bytes": 0,
        "drop_ios": 0,
        "io_bytes": 0,
        "iops_max": 0,
        "iops_min": 0,
        "io_kbytes": 0,
        "iops_mean": 0.0,
        "short_ios": 0,
        "total_ios": 0,
        "bw_samples": 0,
        "iops_stddev": 0.0,
        "iops_samples": 0
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "random_read",
      "sys_cpu": 14.282857,
      "usr_cpu": 4.024866,
      "job_start": 1793931237245,
      "latency_ms": {
        "2": 90.908129,
        "4": 0.741222,
        "10": 0.025491,
        "20": 0.0,
        "50": 0.0,
        "100": 0.0,
        "250": 0.0,
        "500": 0.0,
        "750": 0.0,
        "1000": 0.0,
        "2000": 0.0,
        ">=2000": 0.0
      },
      "latency_ns": {
        "2": 0.0,
        "4": 0.0,
        "10": 0.0,
        "20": 0.0,
        "50": 0.0,
        "100": 0.0,
        "250": 0.0,
        "500": 0.0,
        "750": 0.0,
        "1000": 0.0
      },
      "latency_us": {
        "2": 0.0,
        "4": 0.0,
        "10": 0.0,
        "20": 0.0,
        "50": 0.0,
        "100": 0.031614,
        "250": 2.649353,
        "500": 4.651924,
        "750": 0.685982,
        "1000": 0.306286
      },
      "job options": {
        "bs": "4096",
        "rw": "randread",
        "name": "random_read",
        "runtime": "60",
        "time_based": "1",
        "refill_buffers": "1",
        "lat_percentiles": "1",
        "percentile_list": "50:95:99",
        "allow_file_create": "0"
      },
      "job_runtime": 60002,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.997937,
        ">=64": 0.0
      },
      "latency_depth": 32,
      "iodepth_submit": {
        "0": 0.0,
        "4": 100.0,
        "8": 0.0,
        "16": 0.0,
        "32": 0.0,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_target": 0,
      "latency_window": 0,
      "iodepth_complete": {
        "0": 0.0,
        "4": 99.999933,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Thu Nov  5 18:14:57 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 95.095391,
      "in_queue": 1832771,
      "read_ios": 1499851,
      "write_ios": 367,
      "read_ticks": 1832581,
      "read_merges": 0,
      "write_ticks": 189,
      "read_sectors": 11998808,
      "write_merges": 53,
      "write_sectors": 6904
    }
  ],
  "timestamp": 1793931297,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793931297390,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261105-63303-hkq5vj/fio.dat",
    "ioengine": "libaio"
  }
}

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