dataforest cloud Fio Disk Tests
Entry XL - Oct 27 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 13623 1786 2292 2212 2933 3391
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261027-75027-6233r4/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-20261027-75027-6233r4/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": 531,
      "eta": 0,
      "majf": 0,
      "minf": 14,
      "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": 1743746,
        "iops": 13623.02295,
        "bw_agg": 100.0,
        "bw_dev": 166699.142034,
        "bw_max": 2310656,
        "bw_min": 944896,
        "lat_ns": {
          "N": 817395,
          "max": 246466060,
          "min": 159234,
          "mean": 2292463.002707,
          "stddev": 1538374.597541,
          "percentile": {
            "50.000000": 2211840,
            "95.000000": 2932736,
            "99.000000": 3391488
          }
        },
        "bw_mean": 1745560.739496,
        "clat_ns": {
          "N": 817395,
          "max": 246400292,
          "min": 142277,
          "mean": 2277074.127484,
          "stddev": 1537677.567382,
          "percentile": {
            "50.000000": 2211840,
            "95.000000": 2899968,
            "99.000000": 3391488
          }
        },
        "runtime": 60001,
        "slat_ns": {
          "N": 817395,
          "max": 3505803,
          "min": 5806,
          "mean": 15388.875223,
          "stddev": 10201.177302
        },
        "bw_bytes": 1785596864,
        "drop_ios": 0,
        "io_bytes": 107137597440,
        "iops_max": 18052,
        "iops_min": 7382,
        "io_kbytes": 104626560,
        "iops_mean": 13637.193277,
        "short_ios": 0,
        "total_ios": 817395,
        "bw_samples": 119,
        "iops_stddev": 1302.337047,
        "iops_samples": 119
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "sequential_write",
      "sys_cpu": 20.905,
      "usr_cpu": 78.563333,
      "job_start": 1793085225395,
      "latency_ms": {
        "2": 19.920357,
        "4": 79.771102,
        "10": 0.28077,
        "20": 0.0,
        "50": 0.0,
        "100": 0.0,
        "250": 0.01,
        "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": 0.01,
        "500": 0.01,
        "750": 0.01,
        "1000": 0.010399
      },
      "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": 99.996207,
        ">=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": 99.999878,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Tue Oct 27 00:14:45 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 67.68897,
      "in_queue": 211865,
      "read_ios": 0,
      "write_ios": 815782,
      "read_ticks": 0,
      "read_merges": 0,
      "write_ticks": 183647,
      "read_sectors": 0,
      "write_merges": 637,
      "write_sectors": 208817888
    }
  ],
  "timestamp": 1793085285,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793085285458,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261027-75027-6233r4/fio.dat",
    "ioengine": "libaio"
  }
}
Sequential read, 128 KiB 54038 7083 591 553 1020 1319
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261027-75027-bnfdc8/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-20261027-75027-bnfdc8/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": 75500,
      "eta": 0,
      "majf": 0,
      "minf": 1035,
      "read": {
        "bw": 6916825,
        "iops": 54037.699372,
        "bw_agg": 100.0,
        "bw_dev": 596961.132457,
        "bw_max": 8011776,
        "bw_min": 4952320,
        "lat_ns": {
          "N": 3242316,
          "max": 23485470,
          "min": 62434,
          "mean": 591446.127463,
          "stddev": 235853.314839,
          "percentile": {
            "50.000000": 552960,
            "95.000000": 1019904,
            "99.000000": 1318912
          }
        },
        "bw_mean": 6923958.857143,
        "clat_ns": {
          "N": 3242316,
          "max": 23477711,
          "min": 49689,
          "mean": 579881.653863,
          "stddev": 236042.141174,
          "percentile": {
            "50.000000": 536576,
            "95.000000": 1011712,
            "99.000000": 1302528
          }
        },
        "runtime": 60001,
        "slat_ns": {
          "N": 3242316,
          "max": 3480856,
          "min": 5984,
          "mean": 11564.473599,
          "stddev": 9354.780323
        },
        "bw_bytes": 7082829332,
        "drop_ios": 0,
        "io_bytes": 424976842752,
        "iops_max": 62592,
        "iops_min": 38690,
        "io_kbytes": 415016448,
        "iops_mean": 54093.512605,
        "short_ios": 0,
        "total_ios": 3242316,
        "bw_samples": 119,
        "iops_stddev": 4663.801577,
        "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": 68.446667,
      "usr_cpu": 9.716667,
      "job_start": 1793085139598,
      "latency_ms": {
        "2": 5.238724,
        "4": 0.034173,
        "10": 0.011442,
        "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": 0.01,
        "100": 0.012368,
        "250": 0.553154,
        "500": 40.123665,
        "750": 42.027828,
        "1000": 11.996517
      },
      "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": 99.999044,
        ">=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": 99.999969,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Tue Oct 27 00:13:19 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 43.82748,
      "in_queue": 1177288,
      "read_ios": 3236621,
      "write_ios": 385,
      "read_ticks": 1176969,
      "read_merges": 0,
      "write_ticks": 278,
      "read_sectors": 828574976,
      "write_merges": 689,
      "write_sectors": 16016
    }
  ],
  "timestamp": 1793085199,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793085199659,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261027-75027-bnfdc8/fio.dat",
    "ioengine": "libaio"
  }
}
Random write, 4 KiB 104372 428 304 289 465 586
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261027-75027-mtlm2d/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-20261027-75027-mtlm2d/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": 71596,
      "eta": 0,
      "majf": 0,
      "minf": 10,
      "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": 417487,
        "iops": 104371.977134,
        "bw_agg": 100.0,
        "bw_dev": 35110.691609,
        "bw_max": 492960,
        "bw_min": 340568,
        "lat_ns": {
          "N": 6262423,
          "max": 154534163,
          "min": 79473,
          "mean": 303602.514887,
          "stddev": 137799.714469,
          "percentile": {
            "50.000000": 288768,
            "95.000000": 464896,
            "99.000000": 585728
          }
        },
        "bw_mean": 418460.773109,
        "clat_ns": {
          "N": 6262423,
          "max": 154531595,
          "min": 74295,
          "mean": 298742.677538,
          "stddev": 137079.408697,
          "percentile": {
            "50.000000": 284672,
            "95.000000": 460800,
            "99.000000": 577536
          }
        },
        "runtime": 60001,
        "slat_ns": {
          "N": 6262423,
          "max": 5965962,
          "min": 2232,
          "mean": 4859.837349,
          "stddev": 6698.646585
        },
        "bw_bytes": 427507618,
        "drop_ios": 0,
        "io_bytes": 25650884608,
        "iops_max": 123240,
        "iops_min": 85142,
        "io_kbytes": 25049692,
        "iops_mean": 104615.260504,
        "short_ios": 0,
        "total_ios": 6262423,
        "bw_samples": 119,
        "iops_stddev": 8777.666417,
        "iops_samples": 119
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "random_write",
      "sys_cpu": 52.551667,
      "usr_cpu": 41.346667,
      "job_start": 1793084865322,
      "latency_ms": {
        "2": 0.048751,
        "4": 0.010523,
        "10": 0.01,
        "20": 0.01,
        "50": 0.01,
        "100": 0.0,
        "250": 0.01,
        "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": 34.218608,
        "500": 63.038284,
        "750": 2.527568,
        "1000": 0.149686
      },
      "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": 99.999505,
        ">=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": 99.999984,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Tue Oct 27 00:08:45 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 59.684283,
      "in_queue": 772571,
      "read_ios": 1,
      "write_ios": 6252886,
      "read_ticks": 1,
      "read_merges": 0,
      "write_ticks": 772571,
      "read_sectors": 8,
      "write_merges": 614,
      "write_sectors": 50034832
    }
  ],
  "timestamp": 1793084925,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793084925389,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261027-75027-mtlm2d/fio.dat",
    "ioengine": "libaio"
  }
}
Random read, 4 KiB 127495 522 250 243 379 481
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261027-75027-wgln7x/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-20261027-75027-wgln7x/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": 220051,
      "eta": 0,
      "majf": 0,
      "minf": 45,
      "read": {
        "bw": 509980,
        "iops": 127495.17508,
        "bw_agg": 100.0,
        "bw_dev": 33155.801574,
        "bw_max": 621072,
        "bw_min": 437048,
        "lat_ns": {
          "N": 7649838,
          "max": 2816656,
          "min": 80754,
          "mean": 250048.093423,
          "stddev": 76334.818247,
          "percentile": {
            "50.000000": 242688,
            "95.000000": 378880,
            "99.000000": 481280
          }
        },
        "bw_mean": 510478.117647,
        "clat_ns": {
          "N": 7649838,
          "max": 2809584,
          "min": 76108,
          "mean": 245856.576417,
          "stddev": 75877.205857,
          "percentile": {
            "50.000000": 238592,
            "95.000000": 374784,
            "99.000000": 477184
          }
        },
        "runtime": 60001,
        "slat_ns": {
          "N": 7649838,
          "max": 1370559,
          "min": 2094,
          "mean": 4191.517007,
          "stddev": 4319.649182
        },
        "bw_bytes": 522220237,
        "drop_ios": 0,
        "io_bytes": 31333736448,
        "iops_max": 155268,
        "iops_min": 109262,
        "io_kbytes": 30599352,
        "iops_mean": 127619.647059,
        "short_ios": 0,
        "total_ios": 7649838,
        "bw_samples": 119,
        "iops_stddev": 8289.005439,
        "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": 59.0,
      "usr_cpu": 24.26,
      "job_start": 1793084774562,
      "latency_ms": {
        "2": 0.012758,
        "4": 0.01,
        "10": 0.0,
        "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": 0.115009,
        "250": 57.00939,
        "500": 42.169599,
        "750": 0.655713,
        "1000": 0.03519
      },
      "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": 99.999595,
        ">=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": 99.999987,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Tue Oct 27 00:07:14 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 44.549186,
      "in_queue": 1147405,
      "read_ios": 7637472,
      "write_ios": 97,
      "read_ticks": 1147336,
      "read_merges": 0,
      "write_ticks": 47,
      "read_sectors": 61099776,
      "write_merges": 27,
      "write_sectors": 7824
    }
  ],
  "timestamp": 1793084834,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793084834620,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261027-75027-wgln7x/fio.dat",
    "ioengine": "libaio"
  }
}

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