Where does 130IOPS come from?

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Hello Cephers,

Whenever I read about HDDs for OSDs it is told that "they will deliver around 130 IOPS".
Where does this number come from and how it was measured (random/seq, how big where the IOs, which queue-dephat what latency) or is it more a general number depending on disk seek times?

Regards and thanks for clarifying,
Steffen

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