MonoVM Fio Disk Tests
Linux 2048 MB - Nov 11 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 2731 358 11640 9896 10158 11207
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261110-53755-xu57xp/fio.dat --size\=38914752512 --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-20261110-53755-xu57xp/fio.dat --size\=38914752512 --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": 137036,
      "eta": 0,
      "majf": 0,
      "minf": 15,
      "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": 349614,
        "iops": 2731.365916,
        "bw_agg": 99.995756,
        "bw_dev": 145849.325613,
        "bw_max": 491776,
        "bw_min": 512,
        "lat_ns": {
          "N": 163912,
          "max": 3690521477,
          "min": 330820,
          "mean": 11639822.162532,
          "stddev": 71505209.584808,
          "percentile": {
            "50.000000": 9895936,
            "95.000000": 10158080,
            "99.000000": 11206656
          }
        },
        "bw_mean": 349600.487395,
        "clat_ns": {
          "N": 163912,
          "max": 3690470517,
          "min": 303630,
          "mean": 11593470.096143,
          "stddev": 71504757.865046,
          "percentile": {
            "50.000000": 9895936,
            "95.000000": 10158080,
            "99.000000": 11206656
          }
        },
        "runtime": 60011,
        "slat_ns": {
          "N": 163912,
          "max": 9857855,
          "min": 12099,
          "mean": 46352.066389,
          "stddev": 84961.389997
        },
        "bw_bytes": 358005593,
        "drop_ios": 0,
        "io_bytes": 21484273664,
        "iops_max": 3842,
        "iops_min": 4,
        "io_kbytes": 20980736,
        "iops_mean": 2731.243697,
        "short_ios": 0,
        "total_ios": 163912,
        "bw_samples": 119,
        "iops_stddev": 1139.443686,
        "iops_samples": 119
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "sequential_write",
      "sys_cpu": 14.755874,
      "usr_cpu": 24.144309,
      "job_start": 1794362816307,
      "latency_ms": {
        "2": 0.091513,
        "4": 0.408146,
        "10": 78.461614,
        "20": 20.666577,
        "50": 0.110425,
        "100": 0.0,
        "250": 0.01,
        "500": 0.01,
        "750": 0.01,
        "1000": 0.01,
        "2000": 0.013422,
        ">=2000": 0.047587
      },
      "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": 0.050027,
        "750": 0.104324,
        "1000": 0.032945
      },
      "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": 60010,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.981087,
        ">=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": 99.99939,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Tue Nov 10 18:07:56 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 69.683922,
      "in_queue": 1889443,
      "read_ios": 78,
      "write_ios": 163610,
      "read_ticks": 41,
      "read_merges": 16,
      "write_ticks": 1889391,
      "read_sectors": 1432,
      "write_merges": 65,
      "write_sectors": 41857984
    }
  ],
  "timestamp": 1794362876,
  "fio version": "fio-3.41",
  "timestamp_ms": 1794362876383,
  "global options": {
    "size": "38914752512",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261110-53755-xu57xp/fio.dat",
    "ioengine": "libaio"
  }
}
Sequential read, 128 KiB 3205 420 9979 10027 10289 10945
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261110-53755-errwp4/fio.dat --size\=38914752512 --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-20261110-53755-errwp4/fio.dat --size\=38914752512 --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": 166905,
      "eta": 0,
      "majf": 0,
      "minf": 1034,
      "read": {
        "bw": 410274,
        "iops": 3205.265789,
        "bw_agg": 100.0,
        "bw_dev": 7398.147164,
        "bw_max": 490752,
        "bw_min": 409037,
        "lat_ns": {
          "N": 192348,
          "max": 83343341,
          "min": 665136,
          "mean": 9978551.693441,
          "stddev": 1526792.815586,
          "percentile": {
            "50.000000": 10027008,
            "95.000000": 10289152,
            "99.000000": 10944512
          }
        },
        "bw_mean": 410799.109244,
        "clat_ns": {
          "N": 192348,
          "max": 83242696,
          "min": 644002,
          "mean": 9929385.291129,
          "stddev": 1518789.267417,
          "percentile": {
            "50.000000": 9895936,
            "95.000000": 10289152,
            "99.000000": 10813440
          }
        },
        "runtime": 60010,
        "slat_ns": {
          "N": 192348,
          "max": 61634141,
          "min": 11019,
          "mean": 49166.402312,
          "stddev": 143818.133395
        },
        "bw_bytes": 420120597,
        "drop_ios": 0,
        "io_bytes": 25211437056,
        "iops_max": 3834,
        "iops_min": 3195,
        "io_kbytes": 24620544,
        "iops_mean": 3209.352941,
        "short_ios": 0,
        "total_ios": 192348,
        "bw_samples": 119,
        "iops_stddev": 57.80103,
        "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": 20.603576,
      "usr_cpu": 4.747621,
      "job_start": 1794362643899,
      "latency_ms": {
        "2": 0.353526,
        "4": 0.252147,
        "10": 62.841828,
        "20": 36.4506,
        "50": 0.034833,
        "100": 0.04783,
        "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": 0.01,
        "1000": 0.017676
      },
      "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": 60009,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.983883,
        ">=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": 99.99948,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Tue Nov 10 18:05:03 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 80.802804,
      "in_queue": 1969643,
      "read_ios": 196454,
      "write_ios": 50,
      "read_ticks": 1969611,
      "read_merges": 53,
      "write_ticks": 30,
      "read_sectors": 49143808,
      "write_merges": 5,
      "write_sectors": 1504
    }
  ],
  "timestamp": 1794362703,
  "fio version": "fio-3.41",
  "timestamp_ms": 1794362703979,
  "global options": {
    "size": "38914752512",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261110-53755-errwp4/fio.dat",
    "ioengine": "libaio"
  }
}
Random write, 4 KiB 14216 58 2246 807 1679 62128
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261110-53755-2kf9d9/fio.dat --size\=38914752512 --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-20261110-53755-2kf9d9/fio.dat --size\=38914752512 --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": 11834,
      "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": 56864,
        "iops": 14216.09605,
        "bw_agg": 100.0,
        "bw_dev": 7163.922931,
        "bw_max": 69920,
        "bw_min": 13632,
        "lat_ns": {
          "N": 853705,
          "max": 190284169,
          "min": 120285,
          "mean": 2245645.817332,
          "stddev": 9116896.949781,
          "percentile": {
            "50.000000": 806912,
            "95.000000": 1679360,
            "99.000000": 62128128
          }
        },
        "bw_mean": 56957.596639,
        "clat_ns": {
          "N": 853705,
          "max": 190274868,
          "min": 89973,
          "mean": 2229221.436828,
          "stddev": 9117357.322422,
          "percentile": {
            "50.000000": 790528,
            "95.000000": 1646592,
            "99.000000": 62128128
          }
        },
        "runtime": 60052,
        "slat_ns": {
          "N": 853705,
          "max": 4392810,
          "min": 4465,
          "mean": 16424.380504,
          "stddev": 18916.349338
        },
        "bw_bytes": 58229129,
        "drop_ios": 0,
        "io_bytes": 3496775680,
        "iops_max": 17480,
        "iops_min": 3408,
        "io_kbytes": 3414820,
        "iops_mean": 14239.394958,
        "short_ios": 0,
        "total_ios": 853705,
        "bw_samples": 119,
        "iops_stddev": 1790.981415,
        "iops_samples": 119
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "random_write",
      "sys_cpu": 22.63909,
      "usr_cpu": 13.951475,
      "job_start": 1794362486339,
      "latency_ms": {
        "2": 23.369548,
        "4": 1.0431,
        "10": 0.15708,
        "20": 0.037484,
        "50": 0.10308,
        "100": 2.157068,
        "250": 0.012768,
        "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": 0.01,
        "250": 0.186013,
        "500": 10.932465,
        "750": 32.94241,
        "1000": 29.058867
      },
      "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": 60051,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.996369,
        ">=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": 99.999883,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Tue Nov 10 18:02:26 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 81.795914,
      "in_queue": 1476251,
      "read_ios": 1,
      "write_ios": 853029,
      "read_ticks": 0,
      "read_merges": 0,
      "write_ticks": 1476244,
      "read_sectors": 8,
      "write_merges": 19,
      "write_sectors": 6825416
    }
  ],
  "timestamp": 1794362546,
  "fio version": "fio-3.41",
  "timestamp_ms": 1794362546458,
  "global options": {
    "size": "38914752512",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261110-53755-2kf9d9/fio.dat",
    "ioengine": "libaio"
  }
}
Random read, 4 KiB 14291 59 2237 782 1647 64225
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261110-53755-fy2xau/fio.dat --size\=38914752512 --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-20261110-53755-fy2xau/fio.dat --size\=38914752512 --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": 23162,
      "eta": 0,
      "majf": 0,
      "minf": 42,
      "read": {
        "bw": 57164,
        "iops": 14291.210072,
        "bw_agg": 100.0,
        "bw_dev": 5058.662983,
        "bw_max": 71528,
        "bw_min": 46504,
        "lat_ns": {
          "N": 858130,
          "max": 72845153,
          "min": 209341,
          "mean": 2236669.641145,
          "stddev": 9274373.147442,
          "percentile": {
            "50.000000": 782336,
            "95.000000": 1646592,
            "99.000000": 64225280
          }
        },
        "bw_mean": 57292.285714,
        "clat_ns": {
          "N": 858130,
          "max": 72777041,
          "min": 202453,
          "mean": 2221560.126004,
          "stddev": 9274746.291954,
          "percentile": {
            "50.000000": 765952,
            "95.000000": 1613824,
            "99.000000": 64225280
          }
        },
        "runtime": 60046,
        "slat_ns": {
          "N": 858130,
          "max": 6265937,
          "min": 3324,
          "mean": 15109.515141,
          "stddev": 19482.05272
        },
        "bw_bytes": 58536796,
        "drop_ios": 0,
        "io_bytes": 3514900480,
        "iops_max": 17882,
        "iops_min": 11626,
        "io_kbytes": 3432520,
        "iops_mean": 14323.05042,
        "short_ios": 0,
        "total_ios": 858130,
        "bw_samples": 119,
        "iops_stddev": 1264.666378,
        "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": 21.760346,
      "usr_cpu": 9.702723,
      "job_start": 1794362329446,
      "latency_ms": {
        "2": 21.604535,
        "4": 0.864088,
        "10": 0.064909,
        "20": 0.0,
        "50": 0.025987,
        "100": 2.211436,
        "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": 0.015848,
        "500": 12.279841,
        "750": 35.886637,
        "1000": 27.046718
      },
      "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": 60045,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.996387,
        ">=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": 99.999883,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Tue Nov 10 17:59:49 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 80.998017,
      "in_queue": 1618298,
      "read_ios": 857368,
      "write_ios": 64,
      "read_ticks": 1617505,
      "read_merges": 4,
      "write_ticks": 726,
      "read_sectors": 6859008,
      "write_merges": 10,
      "write_sectors": 1552
    }
  ],
  "timestamp": 1794362389,
  "fio version": "fio-3.41",
  "timestamp_ms": 1794362389557,
  "global options": {
    "size": "38914752512",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261110-53755-fy2xau/fio.dat",
    "ioengine": "libaio"
  }
}

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