My though was to use hardware raid, and just set that up for the 2 hdds, then boot off an ssd with Debian (very familiar, and use it for current server which has 30+ docker containers. Basically I like and am good at docker so would like to stick to Debian+docker. But if hardware raid isn’t the best option for HDDs now a days, I’ll learn the better thing)
Which drives? Renewed or refurb are half the cost, so should I buy extra used ones, and just be ready to swap when the fail?
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How does the replacing of a HDD work on btrfs? Like if one failed and I’m using Debian, how do I rebuild the raid 1?
Or should I use an actual raid os?
Assuming that the disk is of identical (or greater) capacity to the one being replaced, you can run
btrfs replace.https://wiki.tnonline.net/w/Btrfs/Replacing_a_disk#Replacing_with_equal_sized_or_a_larger_disk