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Using fio to read from Linux buffer-cache
Sometimes we want to read from the Linux cache rather than the underlying device using fio. There are couple of…
Category: fio
Tips and tricks for the fio testing tool
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fio versions < 3.3 may show inflated random write performance
TL;DR If your storage system implements inline compression, performance results with small IO size random writes with time_based and runtime…
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Specifying Drive letters with fio for Windows.
fio on Windows Download pre-compiled fio binary for Windows Example fio windows file, single drive This will create a 1GB…
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Using rwmixread and rate_iops in fio
Creating a mixed read/write workload with fio can be a bit confusing. Assume we want to create a fixed rate…
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Understanding fio norandommap and randrepeat parameters
The parameters norandommap and randrepeat significantly change the way that repeated random IO workloads will be executed, and also can…
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Creating compressible data with fio.
Today I used fio to create some compressible data to test on my Nutanix nodes. I ended up using the…
3 min read
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Multiple devices/jobs in fio
If your underlying filesystem/devices have different response times (e.g. some devices are cached – or are on SSD) and others…