Test the hard drive’s performance

When installed to a cluster, the application’s performance and stability depends on the hard drive’s speed. A slow hard drive increases the request latency in the cluster and can cause it to become unstable. We suggest that you use the fio tool to test the hard drive’s speed.

Install and run fio to test your hard drive:

apt install fio
mkdir test-data
fio --rw=write --ioengine=sync --fdatasync=1 --directory=test-data --size=100m --bs=2300 --name=mytest

In the fdatasync data section, we need to check the value of the 99.00th percentile. The hard drive is fast enough if the latency is less than 10 ms. For example, if the value is 2000, the latency is 2 ms.

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