Kamatera Fio Disk Tests
General 4GB 2 cores - Nov 07 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 18390 2410 1710 1303 3228 5145
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261106-61754-855rqf/fio.dat --size\=29660020736 --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-20261106-61754-855rqf/fio.dat --size\=29660020736 --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": 28087,
      "eta": 0,
      "majf": 0,
      "minf": 30,
      "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": 2353908,
        "iops": 18389.913838,
        "bw_agg": 100.0,
        "bw_dev": 438463.964373,
        "bw_max": 3524352,
        "bw_min": 249856,
        "lat_ns": {
          "N": 1103450,
          "max": 77949135,
          "min": 70790,
          "mean": 1709873.910309,
          "stddev": 1838508.469865,
          "percentile": {
            "50.000000": 1302528,
            "95.000000": 3227648,
            "99.000000": 5144576
          }
        },
        "bw_mean": 2354964.226891,
        "clat_ns": {
          "N": 1103450,
          "max": 77931355,
          "min": 29377,
          "mean": 1700386.346636,
          "stddev": 1837608.128443,
          "percentile": {
            "50.000000": 1286144,
            "95.000000": 3227648,
            "99.000000": 5144576
          }
        },
        "runtime": 60003,
        "slat_ns": {
          "N": 1103450,
          "max": 21912231,
          "min": 3534,
          "mean": 9487.563673,
          "stddev": 23481.662866
        },
        "bw_bytes": 2410402786,
        "drop_ios": 0,
        "io_bytes": 144631398400,
        "iops_max": 27534,
        "iops_min": 1952,
        "io_kbytes": 141241600,
        "iops_mean": 18398.109244,
        "short_ios": 0,
        "total_ios": 1103450,
        "bw_samples": 119,
        "iops_stddev": 3425.510613,
        "iops_samples": 119
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "sequential_write",
      "sys_cpu": 17.48775,
      "usr_cpu": 57.256425,
      "job_start": 1794017219335,
      "latency_ms": {
        "2": 60.490915,
        "4": 23.488604,
        "10": 1.456795,
        "20": 0.243418,
        "50": 0.238525,
        "100": 0.01,
        "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": 0.127237,
        "250": 1.300467,
        "500": 2.620871,
        "750": 3.65916,
        "1000": 6.364674
      },
      "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": 60002,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.997191,
        ">=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": 99.999909,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Fri Nov  6 18:07:59 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 56.062729,
      "in_queue": 1068946,
      "read_ios": 0,
      "write_ios": 1131862,
      "read_ticks": 0,
      "read_merges": 0,
      "write_ticks": 1068943,
      "read_sectors": 0,
      "write_merges": 1099,
      "write_sectors": 282010328
    }
  ],
  "timestamp": 1794017279,
  "fio version": "fio-3.41",
  "timestamp_ms": 1794017279402,
  "global options": {
    "size": "29660020736",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261106-61754-855rqf/fio.dat",
    "ioengine": "libaio"
  }
}
Sequential read, 128 KiB 36121 4734 885 750 1843 2966
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261106-61754-smrm0y/fio.dat --size\=29660020736 --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-20261106-61754-smrm0y/fio.dat --size\=29660020736 --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": 233715,
      "eta": 0,
      "majf": 0,
      "minf": 1052,
      "read": {
        "bw": 4623532,
        "iops": 36121.345955,
        "bw_agg": 100.0,
        "bw_dev": 411988.835366,
        "bw_max": 5417728,
        "bw_min": 3057920,
        "lat_ns": {
          "N": 2167353,
          "max": 19138580,
          "min": 71306,
          "mean": 885300.392171,
          "stddev": 564675.082745,
          "percentile": {
            "50.000000": 749568,
            "95.000000": 1843200,
            "99.000000": 2965504
          }
        },
        "bw_mean": 4624125.848739,
        "clat_ns": {
          "N": 2167353,
          "max": 19133168,
          "min": 57003,
          "mean": 877996.279948,
          "stddev": 564740.878126,
          "percentile": {
            "50.000000": 741376,
            "95.000000": 1826816,
            "99.000000": 2965504
          }
        },
        "runtime": 60002,
        "slat_ns": {
          "N": 2167353,
          "max": 2918837,
          "min": 3757,
          "mean": 7304.112223,
          "stddev": 7223.618427
        },
        "bw_bytes": 4734497057,
        "drop_ios": 0,
        "io_bytes": 284079292416,
        "iops_max": 42326,
        "iops_min": 23890,
        "io_kbytes": 277421184,
        "iops_mean": 36125.983193,
        "short_ios": 0,
        "total_ios": 2167353,
        "bw_samples": 119,
        "iops_stddev": 3218.662776,
        "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": 32.557791,
      "usr_cpu": 5.648239,
      "job_start": 1794017148329,
      "latency_ms": {
        "2": 21.046226,
        "4": 3.540402,
        "10": 0.298382,
        "20": 0.020624,
        "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": 0.011581,
        "250": 0.736244,
        "500": 13.921867,
        "750": 36.488242,
        "1000": 23.936433
      },
      "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": 60001,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.99857,
        ">=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": 99.999954,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Fri Nov  6 18:06:48 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 66.504296,
      "in_queue": 1739477,
      "read_ios": 2163434,
      "write_ios": 511,
      "read_ticks": 1739135,
      "read_merges": 0,
      "write_ticks": 331,
      "read_sectors": 553831944,
      "write_merges": 397,
      "write_sectors": 13128
    }
  ],
  "timestamp": 1794017208,
  "fio version": "fio-3.41",
  "timestamp_ms": 1794017208380,
  "global options": {
    "size": "29660020736",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261106-61754-smrm0y/fio.dat",
    "ioengine": "libaio"
  }
}
Random write, 4 KiB 38087 156 838 602 1810 3326
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261106-61754-1l9n0u/fio.dat --size\=29660020736 --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-20261106-61754-1l9n0u/fio.dat --size\=29660020736 --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": 302612,
      "eta": 0,
      "majf": 0,
      "minf": 507,
      "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": 152347,
        "iops": 38086.800813,
        "bw_agg": 100.0,
        "bw_dev": 30015.149343,
        "bw_max": 281656,
        "bw_min": 110568,
        "lat_ns": {
          "N": 2286503,
          "max": 88787726,
          "min": 53209,
          "mean": 838161.535352,
          "stddev": 1717809.653274,
          "percentile": {
            "50.000000": 602112,
            "95.000000": 1810432,
            "99.000000": 3325952
          }
        },
        "bw_mean": 152433.4,
        "clat_ns": {
          "N": 2286503,
          "max": 88783581,
          "min": 23202,
          "mean": 833613.361902,
          "stddev": 1717711.204233,
          "percentile": {
            "50.000000": 602112,
            "95.000000": 1810432,
            "99.000000": 3325952
          }
        },
        "runtime": 60034,
        "slat_ns": {
          "N": 2286503,
          "max": 2639518,
          "min": 1565,
          "mean": 4548.17345,
          "stddev": 6437.464516
        },
        "bw_bytes": 156003536,
        "drop_ios": 0,
        "io_bytes": 9365516288,
        "iops_max": 70414,
        "iops_min": 27642,
        "io_kbytes": 9146012,
        "iops_mean": 38108.366667,
        "short_ios": 0,
        "total_ios": 2286503,
        "bw_samples": 120,
        "iops_stddev": 7503.753091,
        "iops_samples": 120
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "random_write",
      "sys_cpu": 20.69695,
      "usr_cpu": 12.436493,
      "job_start": 1794017071844,
      "latency_ms": {
        "2": 16.979947,
        "4": 3.23236,
        "10": 0.335184,
        "20": 0.092499,
        "50": 0.185698,
        "100": 0.016313,
        "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": 0.232495,
        "250": 6.153196,
        "500": 31.693989,
        "750": 25.98807,
        "1000": 15.089899
      },
      "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": 60033,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.998644,
        ">=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": 99.999956,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Fri Nov  6 18:05:31 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 72.235196,
      "in_queue": 1789302,
      "read_ios": 0,
      "write_ios": 2282665,
      "read_ticks": 0,
      "read_merges": 0,
      "write_ticks": 1789292,
      "read_sectors": 0,
      "write_merges": 392,
      "write_sectors": 18266840
    }
  ],
  "timestamp": 1794017131,
  "fio version": "fio-3.41",
  "timestamp_ms": 1794017131987,
  "global options": {
    "size": "29660020736",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261106-61754-1l9n0u/fio.dat",
    "ioengine": "libaio"
  }
}
Random read, 4 KiB 97521 399 327 309 510 651
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261106-61754-fd5l6n/fio.dat --size\=29660020736 --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-20261106-61754-fd5l6n/fio.dat --size\=29660020736 --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": 377454,
      "eta": 0,
      "majf": 0,
      "minf": 56,
      "read": {
        "bw": 390082,
        "iops": 97520.674655,
        "bw_agg": 100.0,
        "bw_dev": 16985.004393,
        "bw_max": 426968,
        "bw_min": 330088,
        "lat_ns": {
          "N": 5851338,
          "max": 5296580,
          "min": 54718,
          "mean": 327467.254514,
          "stddev": 112665.198996,
          "percentile": {
            "50.000000": 309248,
            "95.000000": 509952,
            "99.000000": 651264
          }
        },
        "bw_mean": 390367.462185,
        "clat_ns": {
          "N": 5851338,
          "max": 5293536,
          "min": 52586,
          "mean": 324516.325037,
          "stddev": 112778.902745,
          "percentile": {
            "50.000000": 309248,
            "95.000000": 505856,
            "99.000000": 651264
          }
        },
        "runtime": 60001,
        "slat_ns": {
          "N": 5851338,
          "max": 2747588,
          "min": 1416,
          "mean": 2950.929477,
          "stddev": 4138.769987
        },
        "bw_bytes": 399444683,
        "drop_ios": 0,
        "io_bytes": 23967080448,
        "iops_max": 106742,
        "iops_min": 82522,
        "io_kbytes": 23405352,
        "iops_mean": 97591.882353,
        "short_ios": 0,
        "total_ios": 5851338,
        "bw_samples": 119,
        "iops_stddev": 4246.248189,
        "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": 34.401667,
      "usr_cpu": 14.331667,
      "job_start": 1794016998105,
      "latency_ms": {
        "2": 0.130449,
        "4": 0.031412,
        "10": 0.01,
        "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": 0.017996,
        "250": 21.205611,
        "500": 73.465573,
        "750": 4.902349,
        "1000": 0.245397
      },
      "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": 99.99947,
        ">=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": 99.999983,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Fri Nov  6 18:04:18 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 59.62103,
      "in_queue": 1616757,
      "read_ios": 5840769,
      "write_ios": 574,
      "read_ticks": 1616426,
      "read_merges": 0,
      "write_ticks": 329,
      "read_sectors": 46726152,
      "write_merges": 280,
      "write_sectors": 20048
    }
  ],
  "timestamp": 1794017058,
  "fio version": "fio-3.41",
  "timestamp_ms": 1794017058148,
  "global options": {
    "size": "29660020736",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261106-61754-fd5l6n/fio.dat",
    "ioengine": "libaio"
  }
}

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