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RAID 1 Significant Performance Loss Dedicated Server
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RAID 1 Significant Performance Loss Dedicated Server

Running some tests on a Hetzner auction server with 2x 512GB NVMe drives in RAID 1 and noticed that when I run bench.sh inside the rescue system (no RAID configured) I get massive IO speed, upwards of 2000 MB/s.

But as soon as I install an OS and RAID 1 goes into effect, that speed drops to ~550-650 MB/s. Which is still plenty fast, but clearly well below what these drives are capable of.

I also noticed something similar with an NForce dedi running a pair of Samsung 850/860 SSDs, where in single drive performance the IO speed would be ~580 MB/s, but in RAID 1 they would be capped at 400 MB/s.

Has anyone noticed something like this before?

In my case, I run a pretty latency-intensive database, so I'll take any additional IO speed gains I can get. So my question is, if software RAID 1 puts such a performance limit on SSD/NVMe drives, would I be better off going with a single drive application and implementing redundancy a different way?

Thanks.

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