Tag: fio

Here be Zeroes
By: Date: June 12, 2014 Categories: Debugging Tags: ,

Many storage devices/filesystems treat blocks containing nothing but zeros in a special way, often short-circuiting reads from the back-end.  This is normally a good thing but this behavior can cause odd results when benchmarking.  This typically comes up when testing against storage using raw devices that have been thin provisioned. In this example, I have several…

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