Urgent problem while using Fio to test random write performance

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hi all~
I wanted to use fio to test random write performance, the command line is as forllowing:

fio --filename=/dev/sdb1 --direct=1 --iodepth 1 --thread --rw=randwrite --ioengine=psync --bs=16k --size=200G --numjobs=10 --runtime=1000 --group_reporting --name=mytest

After the execution of fio finished, my disc usage become 100%, is there any method to release the content written by Fio?

 Thanks a lot in advance!!

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王楠    技术研发中心
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中国互联网络信息中心 CNNIC
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Nan WANG
Research&Development Center
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China Internet Network Information Center (CNNIC)
Website: www.cnnic.cn
         中国互联网络信息中心.中国
Add: 4th Zhongguancun Nansijie, Haidian District, Beijing 100190, China
POB: Beijing 349, Branch 6


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