Performance increase with NVMe for WAL/DB and SAS SSD for data

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Hi all,

given that everywhere I find performance increases with WAL/DB on SSD and
data on HDD, I'm trying to understand how much the performance increase
would be using NVME for WAL/DB and regular sata SSD for data.
Unfortunately I've looked back and forth on the internet but I couldn't
find any test or performance analysis on something like this.

Right now i've a full flash storage with 15 OSD and 5 nodes, and ssd
nominal IOPS are 175k read and 120k write.

Thanks everyone,

Erik
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