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FAQ: https://www.scaleway.com/faq/server/

"How does the SSD storage perform?

SSD drives provide excellent performances with a really low latency. They perform especially well with random access patterns. Our SSD storage provide an average latency of 550 μs (550 microseconds) when a traditional rotating drive has a latency of several miliseconds.

We provide 2000 IOPS (an IO is a 4K random read or write access) per 50GB chunk you buy. It means that if you buy a 150GB volume (3 chunks), you will get about 6000 IOPS (3x2000).

To enjoy the performance of your volume, your application needs to use parallel IO. The total bandwidth of your volumes is limited to 120MB/s by the network link."