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.
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Your information is about 10 years out of date. It is trivial to do boot with raid as in EFI you just set both drives as bootable.
I think hardware raid is only for the last resort as Windows has Storage sense and Linux has ZFS, LVM and mdadm. I’ve never heard of a hardware raid system that has the features a lot of these systems have like data integrity checking and ram caching.
Essentially I don’t really see a need for hardware raid in a home environment and there isn’t a huge need in the business.
Hardware RAID just works, and for many, that’s good enough. In more advanced systems, all its got to handle is a boot partition, and if you’re doing your job as a sysadmin there’s zero important data in there that can’t be easily rebuilt or restored.