HostUp Fio Disk Tests
VPS SM - Oct 25 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 2459 322 12958 12124 25035 42729
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261024-58954-6gz8jt/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-20261024-58954-6gz8jt/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": 20270,
      "eta": 0,
      "majf": 0,
      "minf": 13,
      "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": 314761,
        "iops": 2459.072124,
        "bw_agg": 100.0,
        "bw_dev": 27762.499841,
        "bw_max": 371200,
        "bw_min": 173312,
        "lat_ns": {
          "N": 147564,
          "max": 190403538,
          "min": 1110846,
          "mean": 12957770.357641,
          "stddev": 7841440.317359,
          "percentile": {
            "50.000000": 12124160,
            "95.000000": 25034752,
            "99.000000": 42729472
          }
        },
        "bw_mean": 315275.831933,
        "clat_ns": {
          "N": 147564,
          "max": 190336227,
          "min": 1090205,
          "mean": 12943579.947426,
          "stddev": 7842671.555548,
          "percentile": {
            "50.000000": 12124160,
            "95.000000": 25034752,
            "99.000000": 42729472
          }
        },
        "runtime": 60008,
        "slat_ns": {
          "N": 147564,
          "max": 1501612,
          "min": 5151,
          "mean": 14190.410215,
          "stddev": 11166.937773
        },
        "bw_bytes": 322315501,
        "drop_ios": 0,
        "io_bytes": 19341508608,
        "iops_max": 2900,
        "iops_min": 1354,
        "io_kbytes": 18888192,
        "iops_mean": 2463.092437,
        "short_ios": 0,
        "total_ios": 147564,
        "bw_samples": 119,
        "iops_stddev": 216.89453,
        "iops_samples": 119
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "sequential_write",
      "sys_cpu": 3.844551,
      "usr_cpu": 14.598297,
      "job_start": 1792909248252,
      "latency_ms": {
        "2": 3.274511,
        "4": 4.263235,
        "10": 23.797132,
        "20": 59.957713,
        "50": 8.339432,
        "100": 0.324605,
        "250": 0.043371,
        "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": 0.0,
        "1000": 0.0
      },
      "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": 60007,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.978992,
        ">=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": 99.999322,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Sat Oct 24 23:21:48 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 83.903367,
      "in_queue": 1841457,
      "read_ios": 8,
      "write_ios": 147371,
      "read_ticks": 6,
      "read_merges": 0,
      "write_ticks": 1841375,
      "read_sectors": 136,
      "write_merges": 8,
      "write_sectors": 37713104
    }
  ],
  "timestamp": 1792909308,
  "fio version": "fio-3.41",
  "timestamp_ms": 1792909308310,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261024-58954-6gz8jt/fio.dat",
    "ioengine": "libaio"
  }
}
Sequential read, 128 KiB 4006 525 7986 7373 14352 27394
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261024-58954-mpk94p/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-20261024-58954-mpk94p/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": 222444,
      "eta": 0,
      "majf": 0,
      "minf": 1037,
      "read": {
        "bw": 512810,
        "iops": 4006.332489,
        "bw_agg": 100.0,
        "bw_dev": 12296.794081,
        "bw_max": 591872,
        "bw_min": 475136,
        "lat_ns": {
          "N": 240412,
          "max": 75491375,
          "min": 554917,
          "mean": 7985950.456986,
          "stddev": 4628662.907078,
          "percentile": {
            "50.000000": 7372800,
            "95.000000": 14352384,
            "99.000000": 27394048
          }
        },
        "bw_mean": 513241.277311,
        "clat_ns": {
          "N": 240412,
          "max": 75473484,
          "min": 534337,
          "mean": 7968930.433402,
          "stddev": 4628620.402772,
          "percentile": {
            "50.000000": 7372800,
            "95.000000": 14352384,
            "99.000000": 27394048
          }
        },
        "runtime": 60008,
        "slat_ns": {
          "N": 240412,
          "max": 1767115,
          "min": 5320,
          "mean": 17020.023585,
          "stddev": 9326.716501
        },
        "bw_bytes": 525118011,
        "drop_ios": 0,
        "io_bytes": 31511281664,
        "iops_max": 4624,
        "iops_min": 3712,
        "io_kbytes": 30772736,
        "iops_mean": 4009.697479,
        "short_ios": 0,
        "total_ios": 240412,
        "bw_samples": 119,
        "iops_stddev": 96.068704,
        "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": 9.155599,
      "usr_cpu": 1.308181,
      "job_start": 1792909022140,
      "latency_ms": {
        "2": 2.37093,
        "4": 7.770411,
        "10": 70.035606,
        "20": 17.471674,
        "50": 1.725787,
        "100": 0.110643,
        "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": 0.07404,
        "1000": 0.44091
      },
      "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": 60007,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.987105,
        ">=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": 99.999584,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Sat Oct 24 23:18:02 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 93.152399,
      "in_queue": 1913388,
      "read_ios": 239962,
      "write_ios": 49,
      "read_ticks": 1912879,
      "read_merges": 0,
      "write_ticks": 501,
      "read_sectors": 61428576,
      "write_merges": 10,
      "write_sectors": 3928
    }
  ],
  "timestamp": 1792909082,
  "fio version": "fio-3.41",
  "timestamp_ms": 1792909082188,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261024-58954-mpk94p/fio.dat",
    "ioengine": "libaio"
  }
}
Random write, 4 KiB 19665 81 1622 1204 3031 8585
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261024-58954-nvgq4m/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-20261024-58954-nvgq4m/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": 543563,
      "eta": 0,
      "majf": 0,
      "minf": 11,
      "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": 78660,
        "iops": 19665.205799,
        "bw_agg": 100.0,
        "bw_dev": 11158.410983,
        "bw_max": 96304,
        "bw_min": 38968,
        "lat_ns": {
          "N": 1180109,
          "max": 208791210,
          "min": 602139,
          "mean": 1622333.907598,
          "stddev": 2708197.036473,
          "percentile": {
            "50.000000": 1204224,
            "95.000000": 3031040,
            "99.000000": 8585216
          }
        },
        "bw_mean": 78723.226891,
        "clat_ns": {
          "N": 1180109,
          "max": 208759409,
          "min": 54861,
          "mean": 1612931.278921,
          "stddev": 2708063.574207,
          "percentile": {
            "50.000000": 1187840,
            "95.000000": 3031040,
            "99.000000": 8585216
          }
        },
        "runtime": 60010,
        "slat_ns": {
          "N": 1180109,
          "max": 4543597,
          "min": 2280,
          "mean": 9402.628678,
          "stddev": 10082.732118
        },
        "bw_bytes": 80548682,
        "drop_ios": 0,
        "io_bytes": 4833726464,
        "iops_max": 24076,
        "iops_min": 9742,
        "io_kbytes": 4720436,
        "iops_mean": 19680.823529,
        "short_ios": 0,
        "total_ios": 1180109,
        "bw_samples": 119,
        "iops_stddev": 2789.615044,
        "iops_samples": 119
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "random_write",
      "sys_cpu": 21.898382,
      "usr_cpu": 12.989718,
      "job_start": 1792908796224,
      "latency_ms": {
        "2": 65.886372,
        "4": 9.663938,
        "10": 2.091332,
        "20": 0.504021,
        "50": 0.263959,
        "100": 0.035844,
        "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": 0.01,
        "500": 0.01,
        "750": 0.25396,
        "1000": 21.29083
      },
      "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": 60009,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.997373,
        ">=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": 99.999915,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Sat Oct 24 23:14:16 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 80.198185,
      "in_queue": 1886701,
      "read_ios": 28,
      "write_ios": 1178239,
      "read_ticks": 29,
      "read_merges": 0,
      "write_ticks": 1886653,
      "read_sectors": 1216,
      "write_merges": 15,
      "write_sectors": 9429288
    }
  ],
  "timestamp": 1792908856,
  "fio version": "fio-3.41",
  "timestamp_ms": 1792908856275,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261024-58954-nvgq4m/fio.dat",
    "ioengine": "libaio"
  }
}
Random read, 4 KiB 45730 187 699 498 1204 4145
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261024-58954-iklwln/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-20261024-58954-iklwln/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": 820425,
      "eta": 0,
      "majf": 0,
      "minf": 43,
      "read": {
        "bw": 182920,
        "iops": 45730.105825,
        "bw_agg": 100.0,
        "bw_dev": 25290.939126,
        "bw_max": 225256,
        "bw_min": 82192,
        "lat_ns": {
          "N": 2744035,
          "max": 193016594,
          "min": 243023,
          "mean": 698795.626512,
          "stddev": 1607253.053113,
          "percentile": {
            "50.000000": 497664,
            "95.000000": 1204224,
            "99.000000": 4145152
          }
        },
        "bw_mean": 183047.97479,
        "clat_ns": {
          "N": 2744035,
          "max": 193005705,
          "min": 147422,
          "mean": 691953.70131,
          "stddev": 1607115.851245,
          "percentile": {
            "50.000000": 493568,
            "95.000000": 1204224,
            "99.000000": 4145152
          }
        },
        "runtime": 60005,
        "slat_ns": {
          "N": 2744035,
          "max": 6808087,
          "min": 2120,
          "mean": 6841.925202,
          "stddev": 10343.137856
        },
        "bw_bytes": 187310513,
        "drop_ios": 0,
        "io_bytes": 11239567360,
        "iops_max": 56314,
        "iops_min": 20548,
        "io_kbytes": 10976140,
        "iops_mean": 45762.033613,
        "short_ios": 0,
        "total_ios": 2744035,
        "bw_samples": 119,
        "iops_stddev": 6322.75442,
        "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": 37.844144,
      "usr_cpu": 9.552696,
      "job_start": 1792908570050,
      "latency_ms": {
        "2": 4.12349,
        "4": 1.4838,
        "10": 0.642922,
        "20": 0.271279,
        "50": 0.113446,
        "100": 0.012318,
        "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": 52.614671,
        "750": 35.380015,
        "1000": 5.3562
      },
      "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": 60004,
      "iodepth_level": {
        "1": 0.1,
        "2": 0.1,
        "4": 0.1,
        "8": 0.1,
        "16": 0.1,
        "32": 99.99887,
        ">=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": 99.999964,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Sat Oct 24 23:10:30 2026",
  "disk_util": [
    {
      "name": "sda",
      "util": 79.999333,
      "in_queue": 1856382,
      "read_ios": 2739494,
      "write_ios": 66,
      "read_ticks": 1856133,
      "read_merges": 0,
      "write_ticks": 243,
      "read_sectors": 21916080,
      "write_merges": 7,
      "write_sectors": 5568
    }
  ],
  "timestamp": 1792908630,
  "fio version": "fio-3.41",
  "timestamp_ms": 1792908630113,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261024-58954-iklwln/fio.dat",
    "ioengine": "libaio"
  }
}

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