Raff Fio Disk Tests
Cost-Opt 2 vCPUs 4 GB - Oct 29 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 21064 2761 1496 1466 1925 2540
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261028-61546-m98r9y/fio.dat --size\=30503075840 --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-20261028-61546-m98r9y/fio.dat --size\=30503075840 --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": 60703,
      "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": 2696185,
        "iops": 21063.947868,
        "bw_agg": 100.0,
        "bw_dev": 89203.609422,
        "bw_max": 2748416,
        "bw_min": 2196736,
        "lat_ns": {
          "N": 1263879,
          "max": 32967291,
          "min": 187191,
          "mean": 1495544.519025,
          "stddev": 304665.33043,
          "percentile": {
            "50.000000": 1466368,
            "95.000000": 1925120,
            "99.000000": 2539520
          }
        },
        "bw_mean": 2696230.941667,
        "clat_ns": {
          "N": 1263879,
          "max": 32887817,
          "min": 164129,
          "mean": 1482070.003981,
          "stddev": 302918.340293,
          "percentile": {
            "50.000000": 1449984,
            "95.000000": 1908736,
            "99.000000": 2539520
          }
        },
        "runtime": 60002,
        "slat_ns": {
          "N": 1263879,
          "max": 1705115,
          "min": 7800,
          "mean": 13474.515045,
          "stddev": 10525.744947
        },
        "bw_bytes": 2760893775,
        "drop_ios": 0,
        "io_bytes": 165659148288,
        "iops_max": 21472,
        "iops_min": 17162,
        "io_kbytes": 161776512,
        "iops_mean": 21064.3,
        "short_ios": 0,
        "total_ios": 1263879,
        "bw_samples": 120,
        "iops_stddev": 696.895813,
        "iops_samples": 120
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "sequential_write",
      "sys_cpu": 29.717838,
      "usr_cpu": 53.864102,
      "job_start": 1793235367165,
      "latency_ms": {
        "2": 95.660423,
        "4": 4.096753,
        "10": 0.084581,
        "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": 0.01,
        "500": 0.01,
        "750": 0.01,
        "1000": 0.142735
      },
      "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": 60001,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.997547,
        ">=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": 99.999921,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Wed Oct 28 17:57:07 2026",
  "disk_util": [
    {
      "name": "vda",
      "util": 18.543411,
      "in_queue": 1450347,
      "read_ios": 0,
      "write_ios": 1300026,
      "read_ticks": 0,
      "read_merges": 0,
      "write_ticks": 1450346,
      "read_sectors": 0,
      "write_merges": 323,
      "write_sectors": 322939416
    }
  ],
  "timestamp": 1793235427,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793235427303,
  "global options": {
    "size": "30503075840",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261028-61546-m98r9y/fio.dat",
    "ioengine": "libaio"
  }
}
Sequential read, 128 KiB 35918 4708 890 856 1270 1483
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261028-61546-huyc5q/fio.dat --size\=30503075840 --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-20261028-61546-huyc5q/fio.dat --size\=30503075840 --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": 134467,
      "eta": 0,
      "majf": 0,
      "minf": 1035,
      "read": {
        "bw": 4597504,
        "iops": 35918.001367,
        "bw_agg": 100.0,
        "bw_dev": 189872.323997,
        "bw_max": 4909312,
        "bw_min": 4111104,
        "lat_ns": {
          "N": 2155116,
          "max": 3901806,
          "min": 161579,
          "mean": 890459.457623,
          "stddev": 227416.460699,
          "percentile": {
            "50.000000": 856064,
            "95.000000": 1269760,
            "99.000000": 1482752
          }
        },
        "bw_mean": 4599894.05042,
        "clat_ns": {
          "N": 2155116,
          "max": 3890915,
          "min": 132248,
          "mean": 878870.447305,
          "stddev": 227851.659096,
          "percentile": {
            "50.000000": 847872,
            "95.000000": 1269760,
            "99.000000": 1466368
          }
        },
        "runtime": 60001,
        "slat_ns": {
          "N": 2155116,
          "max": 1114543,
          "min": 8250,
          "mean": 11589.010318,
          "stddev": 6674.17827
        },
        "bw_bytes": 4707844275,
        "drop_ios": 0,
        "io_bytes": 282475364352,
        "iops_max": 38354,
        "iops_min": 32118,
        "io_kbytes": 275854848,
        "iops_mean": 35936.655462,
        "short_ios": 0,
        "total_ios": 2155116,
        "bw_samples": 119,
        "iops_stddev": 1483.365233,
        "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": 49.951667,
      "usr_cpu": 4.47,
      "job_start": 1793235294514,
      "latency_ms": {
        "2": 29.458971,
        "4": 0.02218,
        "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": 0.0,
        "250": 0.043107,
        "500": 4.498319,
        "750": 21.636608,
        "1000": 44.340815
      },
      "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": 99.998562,
        ">=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": "Wed Oct 28 17:55:54 2026",
  "disk_util": [
    {
      "name": "vda",
      "util": 50.267683,
      "in_queue": 1613876,
      "read_ios": 2151162,
      "write_ios": 221,
      "read_ticks": 1613728,
      "read_merges": 0,
      "write_ticks": 127,
      "read_sectors": 550674688,
      "write_merges": 211,
      "write_sectors": 3648
    }
  ],
  "timestamp": 1793235354,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793235354652,
  "global options": {
    "size": "30503075840",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261028-61546-huyc5q/fio.dat",
    "ioengine": "libaio"
  }
}
Random write, 4 KiB 67892 278 470 473 709 823
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261028-61546-eg18i/fio.dat --size\=30503075840 --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-20261028-61546-eg18i/fio.dat --size\=30503075840 --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": 143895,
      "eta": 0,
      "majf": 0,
      "minf": 9,
      "read": {
        "bw": 0,
        "iops": 0.0,
        "bw_agg": 0.0,
        "bw_dev": 0.0,
        "bw_max": 0,
        "bw_min": 0,
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_mean": 0.0,
        "clat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "runtime": 0,
        "slat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_bytes": 0,
        "drop_ios": 0,
        "io_bytes": 0,
        "iops_max": 0,
        "iops_min": 0,
        "io_kbytes": 0,
        "iops_mean": 0.0,
        "short_ios": 0,
        "total_ios": 0,
        "bw_samples": 0,
        "iops_stddev": 0.0,
        "iops_samples": 0
      },
      "sync": {
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "total_ios": 0
      },
      "trim": {
        "bw": 0,
        "iops": 0.0,
        "bw_agg": 0.0,
        "bw_dev": 0.0,
        "bw_max": 0,
        "bw_min": 0,
        "lat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_mean": 0.0,
        "clat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "runtime": 0,
        "slat_ns": {
          "N": 0,
          "max": 0,
          "min": 0,
          "mean": 0.0,
          "stddev": 0.0
        },
        "bw_bytes": 0,
        "drop_ios": 0,
        "io_bytes": 0,
        "iops_max": 0,
        "iops_min": 0,
        "io_kbytes": 0,
        "iops_mean": 0.0,
        "short_ios": 0,
        "total_ios": 0,
        "bw_samples": 0,
        "iops_stddev": 0.0,
        "iops_samples": 0
      },
      "error": 0,
      "write": {
        "bw": 271567,
        "iops": 67891.935134,
        "bw_agg": 100.0,
        "bw_dev": 8174.857736,
        "bw_max": 290776,
        "bw_min": 253176,
        "lat_ns": {
          "N": 4073584,
          "max": 3122385,
          "min": 134378,
          "mean": 469965.133046,
          "stddev": 149036.559725,
          "percentile": {
            "50.000000": 473088,
            "95.000000": 708608,
            "99.000000": 823296
          }
        },
        "bw_mean": 271658.285714,
        "clat_ns": {
          "N": 4073584,
          "max": 3108354,
          "min": 125527,
          "mean": 464187.979713,
          "stddev": 149091.684673,
          "percentile": {
            "50.000000": 464896,
            "95.000000": 700416,
            "99.000000": 815104
          }
        },
        "runtime": 60001,
        "slat_ns": {
          "N": 4073584,
          "max": 2224174,
          "min": 3890,
          "mean": 5777.153334,
          "stddev": 5558.932665
        },
        "bw_bytes": 278085366,
        "drop_ios": 0,
        "io_bytes": 16685400064,
        "iops_max": 72694,
        "iops_min": 63294,
        "io_kbytes": 16294336,
        "iops_mean": 67914.621849,
        "short_ios": 0,
        "total_ios": 4073584,
        "bw_samples": 119,
        "iops_stddev": 2043.710878,
        "iops_samples": 119
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "random_write",
      "sys_cpu": 46.978333,
      "usr_cpu": 15.32,
      "job_start": 1793235220918,
      "latency_ms": {
        "2": 0.105239,
        "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": 0.0,
        "250": 8.536218,
        "500": 50.206599,
        "750": 38.937285,
        "1000": 2.211296
      },
      "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": 99.999239,
        ">=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": 99.999975,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Wed Oct 28 17:54:40 2026",
  "disk_util": [
    {
      "name": "vda",
      "util": 46.878596,
      "in_queue": 1386047,
      "read_ios": 0,
      "write_ios": 4065936,
      "read_ticks": 0,
      "read_merges": 0,
      "write_ticks": 1386043,
      "read_sectors": 0,
      "write_merges": 345,
      "write_sectors": 32532008
    }
  ],
  "timestamp": 1793235280,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793235280949,
  "global options": {
    "size": "30503075840",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261028-61546-eg18i/fio.dat",
    "ioengine": "libaio"
  }
}
Random read, 4 KiB 91178 373 350 342 489 594
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261028-61546-eairsb/fio.dat --size\=30503075840 --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-20261028-61546-eairsb/fio.dat --size\=30503075840 --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": 332027,
      "eta": 0,
      "majf": 0,
      "minf": 42,
      "read": {
        "bw": 364710,
        "iops": 91177.513708,
        "bw_agg": 100.0,
        "bw_dev": 12559.877805,
        "bw_max": 395216,
        "bw_min": 335792,
        "lat_ns": {
          "N": 5470742,
          "max": 4387891,
          "min": 141228,
          "mean": 350429.194286,
          "stddev": 76774.006509,
          "percentile": {
            "50.000000": 342016,
            "95.000000": 489472,
            "99.000000": 593920
          }
        },
        "bw_mean": 364841.546218,
        "clat_ns": {
          "N": 5470742,
          "max": 4383881,
          "min": 137078,
          "mean": 345035.902463,
          "stddev": 76631.584733,
          "percentile": {
            "50.000000": 333824,
            "95.000000": 485376,
            "99.000000": 585728
          }
        },
        "runtime": 60001,
        "slat_ns": {
          "N": 5470742,
          "max": 3883773,
          "min": 3640,
          "mean": 5393.291822,
          "stddev": 5475.451448
        },
        "bw_bytes": 373463096,
        "drop_ios": 0,
        "io_bytes": 22408159232,
        "iops_max": 98804,
        "iops_min": 83948,
        "io_kbytes": 21882968,
        "iops_mean": 91210.386555,
        "short_ios": 0,
        "total_ios": 5470742,
        "bw_samples": 119,
        "iops_stddev": 3139.986357,
        "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": 60.441667,
      "usr_cpu": 11.765,
      "job_start": 1793235148251,
      "latency_ms": {
        "2": 0.014696,
        "4": 0.01,
        "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": 0.0,
        "250": 7.174036,
        "500": 88.907666,
        "750": 3.813706,
        "1000": 0.087502
      },
      "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": 99.999433,
        ">=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": 99.999982,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Wed Oct 28 17:53:28 2026",
  "disk_util": [
    {
      "name": "vda",
      "util": 38.803556,
      "in_queue": 1564064,
      "read_ios": 5460362,
      "write_ios": 534,
      "read_ticks": 1563855,
      "read_merges": 0,
      "write_ticks": 205,
      "read_sectors": 43682896,
      "write_merges": 268,
      "write_sectors": 7864
    }
  ],
  "timestamp": 1793235208,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793235208391,
  "global options": {
    "size": "30503075840",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261028-61546-eairsb/fio.dat",
    "ioengine": "libaio"
  }
}

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