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How can I diagnose wrongly set Hard drive partition?

jp flag

I am fairly new at Ubuntu but love it so far, running a headless Ubuntu Server on Dell hardware (RAID1 with HW controller) I have the feeling that my hard drive performance is far from what it should be. My server isn't used for high resources demanding applications however I run easily through high IOWAIT during for example Nextcloud CRON jobs.

Could you please help me by letting me know what commands should I run to have a measure of my RW performance and also what command can I run to check the status of my partitions (I believe something is wrong there)?

I will share the results here to see if someone can point a potential problem and from which I can better orient future researches.

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