# Sequential Write

+ Disk bandwidth
  + Stress test the bandwidth of a disk using the FIO tool
    + Block size 256K
    + Stress test mode: sequential write (TiKV server recommendation: ≥ 1GB bandwidth)

```12
$ fio -ioengine=psync ~!@-bs=256k@!~ -fdatasync=1 \
  -thread ~!@-rw=write@!~ -size=10G \
  -filename=fio_bandwidth_test.txt -name='fio disk bandwidth test' -iodepth=4 \
  -runtime=60 -numjobs=4 -group_reporting --output-format=json \
  --output=fio_bandwidth_test.json
```

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. /fio -ioengine=psync -bs=256k -fdatasync=1 -thread -rw=write -size=10g -filename=fio_bandwidth_test.txt -name='fio disk bandwidth test' -iodepth=4 -runtime=60 -numjobs=4 -group_reporting —output-format=json —output=fio_bandwidth_test.json