Cherry Servers Fio Disk Tests
Performance VDS 2 - 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 3778 495 8442 7897 8847 8978
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261028-55139-zk86c3/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-20261028-55139-zk86c3/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": 80179,
      "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": 483632,
        "iops": 3778.379549,
        "bw_agg": 100.0,
        "bw_dev": 36042.605223,
        "bw_max": 613888,
        "bw_min": 151552,
        "lat_ns": {
          "N": 226733,
          "max": 3538084982,
          "min": 128781,
          "mean": 8441938.454676,
          "stddev": 41951119.069243,
          "percentile": {
            "50.000000": 7897088,
            "95.000000": 8847360,
            "99.000000": 8978432
          }
        },
        "bw_mean": 509154.807018,
        "clat_ns": {
          "N": 226733,
          "max": 3538075424,
          "min": 94826,
          "mean": 8431199.915456,
          "stddev": 41951117.096666,
          "percentile": {
            "50.000000": 7897088,
            "95.000000": 8847360,
            "99.000000": 8978432
          }
        },
        "runtime": 60008,
        "slat_ns": {
          "N": 226733,
          "max": 6249992,
          "min": 5951,
          "mean": 10738.53922,
          "stddev": 13435.340211
        },
        "bw_bytes": 495239764,
        "drop_ios": 0,
        "io_bytes": 29718347776,
        "iops_max": 4796,
        "iops_min": 1184,
        "io_kbytes": 29021824,
        "iops_mean": 3977.77193,
        "short_ios": 0,
        "total_ios": 226733,
        "bw_samples": 114,
        "iops_stddev": 281.582853,
        "iops_samples": 114
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "sequential_write",
      "sys_cpu": 4.831103,
      "usr_cpu": 10.388788,
      "job_start": 1793237425680,
      "latency_ms": {
        "2": 0.958396,
        "4": 0.110262,
        "10": 98.638928,
        "20": 0.159659,
        "50": 0.010144,
        "100": 0.060865,
        "250": 0.0,
        "500": 0.0,
        "750": 0.0,
        "1000": 0.0,
        "2000": 0.0,
        ">=2000": 0.014114
      },
      "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": 0.012349,
        "750": 0.01279,
        "1000": 0.014996
      },
      "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": 99.986328,
        ">=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": 99.999559,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Wed Oct 28 18:31:25 2026",
  "disk_util": [
    {
      "name": "vda",
      "util": 93.874216,
      "in_queue": 1915882,
      "read_ios": 0,
      "write_ios": 226337,
      "read_ticks": 0,
      "read_merges": 0,
      "write_ticks": 1909262,
      "read_sectors": 0,
      "write_merges": 8,
      "write_sectors": 57926120
    }
  ],
  "timestamp": 1793237485,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793237485822,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261028-55139-zk86c3/fio.dat",
    "ioengine": "libaio"
  }
}
Sequential read, 128 KiB 4007 525 7986 7897 8978 8978
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261028-55139-rerpj2/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-20261028-55139-rerpj2/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": 69555,
      "eta": 0,
      "majf": 0,
      "minf": 1038,
      "read": {
        "bw": 512838,
        "iops": 4006.549018,
        "bw_agg": 100.0,
        "bw_dev": 9360.593439,
        "bw_max": 614400,
        "bw_min": 507648,
        "lat_ns": {
          "N": 240429,
          "max": 16477686,
          "min": 324526,
          "mean": 7986393.25432,
          "stddev": 460088.59068,
          "percentile": {
            "50.000000": 7897088,
            "95.000000": 8978432,
            "99.000000": 8978432
          }
        },
        "bw_mean": 512915.2,
        "clat_ns": {
          "N": 240429,
          "max": 16468018,
          "min": 316150,
          "mean": 7975327.525149,
          "stddev": 460562.796805,
          "percentile": {
            "50.000000": 7897088,
            "95.000000": 8978432,
            "99.000000": 8978432
          }
        },
        "runtime": 60009,
        "slat_ns": {
          "N": 240429,
          "max": 1979333,
          "min": 6231,
          "mean": 11065.729172,
          "stddev": 6792.011903
        },
        "bw_bytes": 525146392,
        "drop_ios": 0,
        "io_bytes": 31513509888,
        "iops_max": 4800,
        "iops_min": 3966,
        "io_kbytes": 30774912,
        "iops_mean": 4007.15,
        "short_ios": 0,
        "total_ios": 240429,
        "bw_samples": 120,
        "iops_stddev": 73.129636,
        "iops_samples": 120
      },
      "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": 5.282629,
      "usr_cpu": 0.256632,
      "job_start": 1793237240306,
      "latency_ms": {
        "2": 0.01,
        "4": 0.011646,
        "10": 99.762924,
        "20": 0.042424,
        "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": 0.166785,
        "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": 99.987106,
        ">=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": "Wed Oct 28 18:28:20 2026",
  "disk_util": [
    {
      "name": "vda",
      "util": 97.019155,
      "in_queue": 1910575,
      "read_ios": 239972,
      "write_ios": 68,
      "read_ticks": 1910570,
      "read_merges": 0,
      "write_ticks": 4,
      "read_sectors": 61432832,
      "write_merges": 7,
      "write_sectors": 744
    }
  ],
  "timestamp": 1793237300,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793237300450,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261028-55139-rerpj2/fio.dat",
    "ioengine": "libaio"
  }
}
Random write, 4 KiB 79719 327 400 317 342 358
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261028-55139-w8byc8/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-20261028-55139-w8byc8/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": 480973,
      "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": 318875,
        "iops": 79718.888019,
        "bw_agg": 100.0,
        "bw_dev": 46461.412492,
        "bw_max": 443480,
        "bw_min": 3136,
        "lat_ns": {
          "N": 4783213,
          "max": 8927307433,
          "min": 86160,
          "mean": 399697.450218,
          "stddev": 24745035.103673,
          "percentile": {
            "50.000000": 317440,
            "95.000000": 342016,
            "99.000000": 358400
          }
        },
        "bw_mean": 394491.793814,
        "clat_ns": {
          "N": 4783213,
          "max": 8927297474,
          "min": 82984,
          "mean": 393014.570104,
          "stddev": 24745035.094336,
          "percentile": {
            "50.000000": 309248,
            "95.000000": 333824,
            "99.000000": 350208
          }
        },
        "runtime": 60001,
        "slat_ns": {
          "N": 4783213,
          "max": 718540,
          "min": 2956,
          "mean": 6682.880114,
          "stddev": 2896.866662
        },
        "bw_bytes": 326528565,
        "drop_ios": 0,
        "io_bytes": 19592040448,
        "iops_max": 110870,
        "iops_min": 784,
        "io_kbytes": 19132852,
        "iops_mean": 98622.948454,
        "short_ios": 0,
        "total_ios": 4783213,
        "bw_samples": 97,
        "iops_stddev": 11615.353123,
        "iops_samples": 97
      },
      "elapsed": 61,
      "groupid": 0,
      "jobname": "random_write",
      "sys_cpu": 62.653333,
      "usr_cpu": 11.483333,
      "job_start": 1793237046873,
      "latency_ms": {
        "2": 0.01,
        "4": 0.011331,
        "10": 0.01,
        "20": 0.01,
        "50": 0.0,
        "100": 0.0,
        "250": 0.0,
        "500": 0.0,
        "750": 0.0,
        "1000": 0.0,
        "2000": 0.0,
        ">=2000": 0.01
      },
      "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": 0.163907,
        "500": 99.753388,
        "750": 0.058998,
        "1000": 0.01
      },
      "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": 99.999352,
        ">=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": 99.999979,
        "8": 0.0,
        "16": 0.0,
        "32": 0.1,
        "64": 0.0,
        ">=64": 0.0
      },
      "latency_percentile": 100.0
    }
  ],
  "time": "Wed Oct 28 18:25:07 2026",
  "disk_util": [
    {
      "name": "vda",
      "util": 76.317194,
      "in_queue": 1777286,
      "read_ios": 0,
      "write_ios": 4772593,
      "read_ticks": 0,
      "read_merges": 0,
      "write_ticks": 1760716,
      "read_sectors": 0,
      "write_merges": 18,
      "write_sectors": 38181112
    }
  ],
  "timestamp": 1793237107,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793237107017,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261028-55139-w8byc8/fio.dat",
    "ioengine": "libaio"
  }
}
Random read, 4 KiB 100164 410 319 317 342 354
Commands and Raw Results
Prepare Command
fio --filename\=/opt/uupdates/current/fio_tests/vpsb-fio-20261028-55139-uh6y04/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-20261028-55139-uh6y04/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": 1070969,
      "eta": 0,
      "majf": 0,
      "minf": 43,
      "read": {
        "bw": 400654,
        "iops": 100163.713938,
        "bw_agg": 100.0,
        "bw_dev": 7420.061241,
        "bw_max": 480584,
        "bw_min": 389536,
        "lat_ns": {
          "N": 6009923,
          "max": 2357108,
          "min": 86833,
          "mean": 319104.867855,
          "stddev": 18951.027467,
          "percentile": {
            "50.000000": 317440,
            "95.000000": 342016,
            "99.000000": 354304
          }
        },
        "bw_mean": 400661.533333,
        "clat_ns": {
          "N": 6009923,
          "max": 2348813,
          "min": 82864,
          "mean": 312060.671895,
          "stddev": 18734.434917,
          "percentile": {
            "50.000000": 313344,
            "95.000000": 333824,
            "99.000000": 346112
          }
        },
        "runtime": 60001,
        "slat_ns": {
          "N": 6009923,
          "max": 626139,
          "min": 2794,
          "mean": 7044.19596,
          "stddev": 3268.25325
        },
        "bw_bytes": 410270572,
        "drop_ios": 0,
        "io_bytes": 24616644608,
        "iops_max": 120146,
        "iops_min": 97384,
        "io_kbytes": 24039692,
        "iops_mean": 100165.35,
        "short_ios": 0,
        "total_ios": 6009923,
        "bw_samples": 120,
        "iops_stddev": 1855.017836,
        "iops_samples": 120
      },
      "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": 81.638333,
      "usr_cpu": 6.166667,
      "job_start": 1793236863725,
      "latency_ms": {
        "2": 0.01,
        "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": 0.01,
        "250": 0.712172,
        "500": 99.224649,
        "750": 0.056124,
        "1000": 0.01
      },
      "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": 99.999484,
        ">=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": "Wed Oct 28 18:22:03 2026",
  "disk_util": [
    {
      "name": "vda",
      "util": 83.42002599999999,
      "in_queue": 1828495,
      "read_ios": 5999239,
      "write_ios": 93,
      "read_ticks": 1828477,
      "read_merges": 0,
      "write_ticks": 17,
      "read_sectors": 47993912,
      "write_merges": 24,
      "write_sectors": 1072
    }
  ],
  "timestamp": 1793236923,
  "fio version": "fio-3.41",
  "timestamp_ms": 1793236923869,
  "global options": {
    "size": "42949672960",
    "sync": "0",
    "direct": "1",
    "iodepth": "32",
    "numjobs": "1",
    "filename": "/opt/uupdates/current/fio_tests/vpsb-fio-20261028-55139-uh6y04/fio.dat",
    "ioengine": "libaio"
  }
}

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