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在用 fio 命令测试 TiKV 实例的磁盘性能时当ioengine=psync设置iodepth=4是无意义的 #21326

@geeklc

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@geeklc

File: /release-8.5/faq/deploy-and-maintain-faq.md

在用 fio 命令测试 TiKV 实例的磁盘性能时,当ioengine设置为psync,实际的效果iodepth ≈ 1,所以设置iodepth =4是无意义的。如果想测单IO可以保留psync,可以去掉iodepth。

如果想设置iodepth=4可以选择ioengine为libaio,但是这两种测试的意义不一样了,不知道咱们官网的目的是什么。

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