ScalaHosting Fio Disk Tests
Config #3 - Oct 26 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 6429 843 4890 5079 7766 10027
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261025-75994-7ge7gh/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-20261025-75994-7ge7gh/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": 156005,
      "eta": 0,
      "majf": 0,
      "minf": 13,
      "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": 822962,
        "iops": 6429.392843,
        "bw_agg": 100.0,
        "bw_dev": 229870.314422,
        "bw_max": 1370368,
        "bw_min": 525312,
        "lat_ns": {
          "N": 385770,
          "max": 25156903,
          "min": 276449,
          "mean": 4890246.725653,
          "stddev": 2294705.671715,
          "percentile": {
            "50.000000": 5079040,
            "95.000000": 7766016,
            "99.000000": 10027008
          }
        },
        "bw_mean": 824459.470588,
        "clat_ns": {
          "N": 385770,
          "max": 25150003,
          "min": 262299,
          "mean": 4878238.339593,
          "stddev": 2294259.19269,
          "percentile": {
            "50.000000": 5079040,
            "95.000000": 7766016,
            "99.000000": 9895936
          }
        },
        "runtime": 60001,
        "slat_ns": {
          "N": 385770,
          "max": 4348459,
          "min": 6200,
          "mean": 12008.386059,
          "stddev": 10447.255634
        },
        "bw_bytes": 842713378,
        "drop_ios": 0,
        "io_bytes": 50563645440,
        "iops_max": 10706,
        "iops_min": 4104,
        "io_kbytes": 49378560,
        "iops_mean": 6441.084034,
        "short_ios": 0,
        "total_ios": 385770,
        "bw_samples": 119,
        "iops_stddev": 1795.868963,
        "iops_samples": 119
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "sequential_write",
      "sys_cpu": 8.433333,
      "usr_cpu": 56.933333,
      "job_start": 1792995696350,
      "latency_ms": {
        "2": 8.125567,
        "4": 21.708013,
        "10": 63.769085,
        "20": 0.951344,
        "50": 0.025663,
        "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": 1.153537,
        "750": 2.130544,
        "1000": 2.136247
      },
      "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": 60000,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.991964,
        ">=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": 99.999741,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Sun Oct 25 23:22:36 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 62.210805,
      "in_queue": 1062174,
      "read_ios": 0,
      "write_ios": 385358,
      "read_ticks": 0,
      "read_merges": 0,
      "write_ticks": 1062171,
      "read_sectors": 0,
      "write_merges": 21,
      "write_sectors": 98622472
    }
  ],
  "timestamp": 1792995756,
  "fio version": "fio-3.41",
  "timestamp_ms": 1792995756391,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261025-75994-7ge7gh/fio.dat",
    "ioengine": "libaio"
  }
}
Sequential read, 128 KiB 28931 3792 1106 1057 1794 2408
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261025-75994-dduwqy/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-20261025-75994-dduwqy/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": 1015344,
      "eta": 0,
      "majf": 0,
      "minf": 1035,
      "read": {
        "bw": 3703185,
        "iops": 28931.134481,
        "bw_agg": 100.0,
        "bw_dev": 200386.314987,
        "bw_max": 4003072,
        "bw_min": 2617088,
        "lat_ns": {
          "N": 1735897,
          "max": 27795114,
          "min": 128885,
          "mean": 1105839.914796,
          "stddev": 451597.027968,
          "percentile": {
            "50.000000": 1056768,
            "95.000000": 1794048,
            "99.000000": 2408448
          }
        },
        "bw_mean": 3703640.201681,
        "clat_ns": {
          "N": 1735897,
          "max": 27784544,
          "min": 121073,
          "mean": 1095235.488672,
          "stddev": 451330.320072,
          "percentile": {
            "50.000000": 1036288,
            "95.000000": 1794048,
            "99.000000": 2408448
          }
        },
        "runtime": 60001,
        "slat_ns": {
          "N": 1735897,
          "max": 542097,
          "min": 6570,
          "mean": 10604.426124,
          "stddev": 4726.398423
        },
        "bw_bytes": 3792061658,
        "drop_ios": 0,
        "io_bytes": 227527491584,
        "iops_max": 31274,
        "iops_min": 20446,
        "io_kbytes": 222194816,
        "iops_mean": 28934.722689,
        "short_ios": 0,
        "total_ios": 1735897,
        "bw_samples": 119,
        "iops_stddev": 1565.476128,
        "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": "sequential_read",
      "sys_cpu": 39.271667,
      "usr_cpu": 2.331667,
      "job_start": 1792995596495,
      "latency_ms": {
        "2": 52.490038,
        "4": 2.863476,
        "10": 0.042687,
        "20": 0.01,
        "50": 0.011637,
        "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": 0.1507,
        "500": 2.894584,
        "750": 12.14594,
        "1000": 29.400592
      },
      "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": 60000,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.998214,
        ">=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": 99.999942,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Sun Oct 25 23:20:56 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 72.27485,
      "in_queue": 1890196,
      "read_ios": 1732505,
      "write_ios": 99,
      "read_ticks": 1890169,
      "read_merges": 0,
      "write_ticks": 27,
      "read_sectors": 443521280,
      "write_merges": 15,
      "write_sectors": 968
    }
  ],
  "timestamp": 1792995656,
  "fio version": "fio-3.41",
  "timestamp_ms": 1792995656637,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261025-75994-dduwqy/fio.dat",
    "ioengine": "libaio"
  }
}
Random write, 4 KiB 63253 259 499 537 766 1286
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261025-75994-5k4e54/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-20261025-75994-5k4e54/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": 25510,
      "eta": 0,
      "majf": 0,
      "minf": 13,
      "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,
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          "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": 253011,
        "iops": 63252.879119,
        "bw_agg": 100.0,
        "bw_dev": 82197.20739,
        "bw_max": 464928,
        "bw_min": 191960,
        "lat_ns": {
          "N": 3795236,
          "max": 16761123,
          "min": 63941,
          "mean": 498628.425919,
          "stddev": 230053.409961,
          "percentile": {
            "50.000000": 536576,
            "95.000000": 765952,
            "99.000000": 1286144
          }
        },
        "bw_mean": 253465.882353,
        "clat_ns": {
          "N": 3795236,
          "max": 16754593,
          "min": 51881,
          "mean": 491302.804535,
          "stddev": 229262.998317,
          "percentile": {
            "50.000000": 528384,
            "95.000000": 757760,
            "99.000000": 1286144
          }
        },
        "runtime": 60001,
        "slat_ns": {
          "N": 3795236,
          "max": 367482,
          "min": 2930,
          "mean": 7325.621384,
          "stddev": 3496.451115
        },
        "bw_bytes": 259083792,
        "drop_ios": 0,
        "io_bytes": 15545286656,
        "iops_max": 116232,
        "iops_min": 47990,
        "io_kbytes": 15180944,
        "iops_mean": 63366.504202,
        "short_ios": 0,
        "total_ios": 3795236,
        "bw_samples": 119,
        "iops_stddev": 20549.336264,
        "iops_samples": 119
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "random_write",
      "sys_cpu": 49.22,
      "usr_cpu": 49.416667,
      "job_start": 1792995497968,
      "latency_ms": {
        "2": 2.022404,
        "4": 0.160227,
        "10": 0.013807,
        "20": 0.01,
        "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": 0.281326,
        "250": 13.920742,
        "500": 26.78039,
        "750": 53.756025,
        "1000": 3.064526
      },
      "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": 60000,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.999183,
        ">=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": 99.999974,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Sun Oct 25 23:19:18 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 68.727588,
      "in_queue": 629995,
      "read_ios": 0,
      "write_ios": 3789468,
      "read_ticks": 0,
      "read_merges": 0,
      "write_ticks": 629994,
      "read_sectors": 0,
      "write_merges": 18,
      "write_sectors": 30315968
    }
  ],
  "timestamp": 1792995558,
  "fio version": "fio-3.41",
  "timestamp_ms": 1792995558108,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261025-75994-5k4e54/fio.dat",
    "ioengine": "libaio"
  }
}
Random read, 4 KiB 141153 578 226 206 358 676
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261025-75994-h601b0/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-20261025-75994-h601b0/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": 165701,
      "eta": 0,
      "majf": 0,
      "minf": 42,
      "read": {
        "bw": 564611,
        "iops": 141152.980784,
        "bw_agg": 100.0,
        "bw_dev": 22401.609275,
        "bw_max": 595296,
        "bw_min": 390240,
        "lat_ns": {
          "N": 8469320,
          "max": 22746176,
          "min": 112003,
          "mean": 226319.769145,
          "stddev": 130183.15723,
          "percentile": {
            "50.000000": 205824,
            "95.000000": 358400,
            "99.000000": 675840
          }
        },
        "bw_mean": 565383.798319,
        "clat_ns": {
          "N": 8469320,
          "max": 22740016,
          "min": 102343,
          "mean": 220974.493732,
          "stddev": 130035.731972,
          "percentile": {
            "50.000000": 199680,
            "95.000000": 350208,
            "99.000000": 667648
          }
        },
        "runtime": 60001,
        "slat_ns": {
          "N": 8469320,
          "max": 463604,
          "min": 2890,
          "mean": 5345.275413,
          "stddev": 3355.474184
        },
        "bw_bytes": 578162609,
        "drop_ios": 0,
        "io_bytes": 34690334720,
        "iops_max": 148824,
        "iops_min": 97560,
        "io_kbytes": 33877280,
        "iops_mean": 141345.983193,
        "short_ios": 0,
        "total_ios": 8469320,
        "bw_samples": 119,
        "iops_stddev": 5600.398112,
        "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": 84.363333,
      "usr_cpu": 11.888333,
      "job_start": 1792995400205,
      "latency_ms": {
        "2": 0.261095,
        "4": 0.013661,
        "10": 0.01,
        "20": 0.01,
        "50": 0.01,
        "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": 87.545895,
        "500": 10.28615,
        "750": 1.454839,
        "1000": 0.435785
      },
      "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": 60000,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.999634,
        ">=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": 99.999988,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Sun Oct 25 23:17:40 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 63.735988999999996,
      "in_queue": 1515174,
      "read_ios": 8454448,
      "write_ios": 351,
      "read_ticks": 1515082,
      "read_merges": 0,
      "write_ticks": 87,
      "read_sectors": 67635584,
      "write_merges": 75,
      "write_sectors": 6800
    }
  ],
  "timestamp": 1792995460,
  "fio version": "fio-3.41",
  "timestamp_ms": 1792995460246,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261025-75994-h601b0/fio.dat",
    "ioengine": "libaio"
  }
}

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