I know how RAID work and prevent data lost from disks failures. I want to know is possible way/how easy to recover data from unfunctioned remaining RAID disks due to RAID controller failure or whole system failure. Can I even simply attach one of the RAID 1 disk to the desktop system and read as simple as USB disk? I know getting data from the other RAID types won’t be that simple but is there a way without building the whole RAID system again. Thanks.
If you’re doing it from scratch, I’d recommend starting with a filesystem that has parity checks and filesystem scrubs built in: eg BTRFS or ZFS.
The benefit of something like BRTFS is that you can always add disks down the line and turn it into a RAID cluster with a couple commands.