IONOS Fio Disk Tests
Basic Cube XS - Nov 08 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 1921 252 16645 16712 16908 16908
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261107-64066-kifw6r/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-20261107-64066-kifw6r/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": 114565,
      "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": 245880,
        "iops": 1920.939067,
        "bw_agg": 100.0,
        "bw_dev": 19261.295729,
        "bw_max": 454144,
        "bw_min": 237312,
        "lat_ns": {
          "N": 115289,
          "max": 73961916,
          "min": 624783,
          "mean": 16645203.797977,
          "stddev": 1765737.470776,
          "percentile": {
            "50.000000": 16711680,
            "95.000000": 16908288,
            "99.000000": 16908288
          }
        },
        "bw_mean": 246026.756303,
        "clat_ns": {
          "N": 115289,
          "max": 73397848,
          "min": 617313,
          "mean": 16627391.80424,
          "stddev": 1759880.08186,
          "percentile": {
            "50.000000": 16711680,
            "95.000000": 16908288,
            "99.000000": 16908288
          }
        },
        "runtime": 60017,
        "slat_ns": {
          "N": 115289,
          "max": 46608094,
          "min": 7299,
          "mean": 17811.993737,
          "stddev": 147252.025056
        },
        "bw_bytes": 251781325,
        "drop_ios": 0,
        "io_bytes": 15111159808,
        "iops_max": 3548,
        "iops_min": 1854,
        "io_kbytes": 14756992,
        "iops_mean": 1922.084034,
        "short_ios": 0,
        "total_ios": 115289,
        "bw_samples": 119,
        "iops_stddev": 150.478873,
        "iops_samples": 119
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "sequential_write",
      "sys_cpu": 4.037257,
      "usr_cpu": 3.200813,
      "job_start": 1794102361270,
      "latency_ms": {
        "2": 0.068523,
        "4": 0.077197,
        "10": 0.828353,
        "20": 98.469932,
        "50": 0.143986,
        "100": 0.033828,
        "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": 0.323535,
        "1000": 0.054645
      },
      "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": 60016,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.973111,
        ">=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": 99.999132,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Sat Nov  7 17:47:01 2026",
  "disk_util": [
    {
      "name": "vda",
      "util": 95.088668,
      "in_queue": 1996520,
      "read_ios": 0,
      "write_ios": 121197,
      "read_ticks": 0,
      "read_merges": 0,
      "write_ticks": 1996520,
      "read_sectors": 0,
      "write_merges": 6,
      "write_sectors": 29443920
    }
  ],
  "timestamp": 1794102421,
  "fio version": "fio-3.41",
  "timestamp_ms": 1794102421392,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261107-64066-kifw6r/fio.dat",
    "ioengine": "libaio"
  }
}
Sequential read, 128 KiB 3821 501 8374 8356 8454 8454
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261107-64066-3ds4bu/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-20261107-64066-3ds4bu/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": 228906,
      "eta": 0,
      "majf": 0,
      "minf": 1036,
      "read": {
        "bw": 489089,
        "iops": 3821.010182,
        "bw_agg": 100.0,
        "bw_dev": 8958.566406,
        "bw_max": 586240,
        "bw_min": 488448,
        "lat_ns": {
          "N": 229295,
          "max": 16247069,
          "min": 293906,
          "mean": 8374035.859404,
          "stddev": 344114.552701,
          "percentile": {
            "50.000000": 8355840,
            "95.000000": 8454144,
            "99.000000": 8454144
          }
        },
        "bw_mean": 489342.92437,
        "clat_ns": {
          "N": 229295,
          "max": 16235263,
          "min": 282730,
          "mean": 8361745.182206,
          "stddev": 344289.434353,
          "percentile": {
            "50.000000": 8355840,
            "95.000000": 8454144,
            "99.000000": 8454144
          }
        },
        "runtime": 60009,
        "slat_ns": {
          "N": 229295,
          "max": 146763,
          "min": 7681,
          "mean": 12290.677197,
          "stddev": 4738.610497
        },
        "bw_bytes": 500827446,
        "drop_ios": 0,
        "io_bytes": 30054154240,
        "iops_max": 4580,
        "iops_min": 3816,
        "io_kbytes": 29349760,
        "iops_mean": 3822.991597,
        "short_ios": 0,
        "total_ios": 229295,
        "bw_samples": 119,
        "iops_stddev": 69.9888,
        "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": 6.467471,
      "usr_cpu": 0.518264,
      "job_start": 1794102189288,
      "latency_ms": {
        "2": 0.01,
        "4": 0.01,
        "10": 99.805927,
        "20": 0.010467,
        "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": 0.0,
        "500": 0.165289,
        "750": 0.01,
        "1000": 0.01
      },
      "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": 60008,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.98648,
        ">=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": 99.999564,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Sat Nov  7 17:44:09 2026",
  "disk_util": [
    {
      "name": "vda",
      "util": 95.871284,
      "in_queue": 1913307,
      "read_ios": 228789,
      "write_ios": 102,
      "read_ticks": 1913298,
      "read_merges": 0,
      "write_ticks": 8,
      "read_sectors": 58568960,
      "write_merges": 11,
      "write_sectors": 1000
    }
  ],
  "timestamp": 1794102249,
  "fio version": "fio-3.41",
  "timestamp_ms": 1794102249318,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261107-64066-3ds4bu/fio.dat",
    "ioengine": "libaio"
  }
}
Random write, 4 KiB 20014 82 1598 272 1614 54788
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261107-64066-mcvo4q/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-20261107-64066-mcvo4q/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": 438252,
      "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": 80055,
        "iops": 20013.941403,
        "bw_agg": 100.0,
        "bw_dev": 1051.015765,
        "bw_max": 86938,
        "bw_min": 72289,
        "lat_ns": {
          "N": 1201577,
          "max": 62162505,
          "min": 35399,
          "mean": 1597704.739218,
          "stddev": 6859242.316056,
          "percentile": {
            "50.000000": 272384,
            "95.000000": 1613824,
            "99.000000": 54788096
          }
        },
        "bw_mean": 80203.747899,
        "clat_ns": {
          "N": 1201577,
          "max": 62158569,
          "min": 30803,
          "mean": 1586274.941715,
          "stddev": 6834161.643147,
          "percentile": {
            "50.000000": 268288,
            "95.000000": 1597440,
            "99.000000": 54788096
          }
        },
        "runtime": 60037,
        "slat_ns": {
          "N": 1201577,
          "max": 60690076,
          "min": 3554,
          "mean": 11429.797503,
          "stddev": 599135.238783
        },
        "bw_bytes": 81977103,
        "drop_ios": 0,
        "io_bytes": 4921659392,
        "iops_max": 21734,
        "iops_min": 18072,
        "io_kbytes": 4806308,
        "iops_mean": 20050.890756,
        "short_ios": 0,
        "total_ios": 1201577,
        "bw_samples": 119,
        "iops_stddev": 262.716667,
        "iops_samples": 119
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "random_write",
      "sys_cpu": 26.21094,
      "usr_cpu": 4.988673,
      "job_start": 1794102007891,
      "latency_ms": {
        "2": 35.162041,
        "4": 0.034455,
        "10": 0.01,
        "20": 0.0,
        "50": 0.01,
        "100": 1.575263,
        "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": 0.01,
        "250": 45.5672,
        "500": 16.624819,
        "750": 0.688096,
        "1000": 0.326071
      },
      "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": 60036,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.99742,
        ">=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": 99.999917,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Sat Nov  7 17:41:08 2026",
  "disk_util": [
    {
      "name": "vda",
      "util": 95.124026,
      "in_queue": 1825882,
      "read_ios": 2,
      "write_ios": 1199645,
      "read_ticks": 0,
      "read_merges": 0,
      "write_ticks": 1825882,
      "read_sectors": 16,
      "write_merges": 5,
      "write_sectors": 9597304
    }
  ],
  "timestamp": 1794102068,
  "fio version": "fio-3.41",
  "timestamp_ms": 1794102068051,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261107-64066-mcvo4q/fio.dat",
    "ioengine": "libaio"
  }
}
Random read, 4 KiB 20013 82 1598 249 1614 55312
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261107-64066-ktlt5b/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-20261107-64066-ktlt5b/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": 412160,
      "eta": 0,
      "majf": 0,
      "minf": 42,
      "read": {
        "bw": 80053,
        "iops": 20013.363326,
        "bw_agg": 100.0,
        "bw_dev": 1099.240722,
        "bw_max": 87190,
        "bw_min": 71978,
        "lat_ns": {
          "N": 1201102,
          "max": 66278044,
          "min": 98485,
          "mean": 1598333.951912,
          "stddev": 7090189.241555,
          "percentile": {
            "50.000000": 248832,
            "95.000000": 1613824,
            "99.000000": 55312384
          }
        },
        "bw_mean": 80208.546218,
        "clat_ns": {
          "N": 1201102,
          "max": 66274188,
          "min": 94750,
          "mean": 1592214.230557,
          "stddev": 7087725.439335,
          "percentile": {
            "50.000000": 242688,
            "95.000000": 1613824,
            "99.000000": 55312384
          }
        },
        "runtime": 60015,
        "slat_ns": {
          "N": 1201102,
          "max": 54474361,
          "min": 3384,
          "mean": 6119.721354,
          "stddev": 198159.293922
        },
        "bw_bytes": 81974736,
        "drop_ios": 0,
        "io_bytes": 4919713792,
        "iops_max": 21797,
        "iops_min": 17994,
        "io_kbytes": 4804408,
        "iops_mean": 20052.05042,
        "short_ios": 0,
        "total_ios": 1201102,
        "bw_samples": 119,
        "iops_stddev": 274.809914,
        "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": 16.147899,
      "usr_cpu": 1.947879,
      "job_start": 1794101860112,
      "latency_ms": {
        "2": 33.463353,
        "4": 0.01,
        "10": 0.0,
        "20": 0.0,
        "50": 0.0,
        "100": 1.597033,
        "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": 0.01,
        "250": 53.550073,
        "500": 10.709165,
        "750": 0.384064,
        "1000": 0.289401
      },
      "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": 60014,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.997419,
        ">=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": 99.999917,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Sat Nov  7 17:38:40 2026",
  "disk_util": [
    {
      "name": "vda",
      "util": 91.258665,
      "in_queue": 1792080,
      "read_ios": 1199204,
      "write_ios": 96,
      "read_ticks": 1791983,
      "read_merges": 27,
      "write_ticks": 96,
      "read_sectors": 9594000,
      "write_merges": 19,
      "write_sectors": 1016
    }
  ],
  "timestamp": 1794101920,
  "fio version": "fio-3.41",
  "timestamp_ms": 1794101920226,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261107-64066-ktlt5b/fio.dat",
    "ioengine": "libaio"
  }
}

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