As far as I understand was
RAID invented to protect from hardware failure induced data loss:
Say, you have 2 harddrives in
RAID1, one goes south, lucky you, the other one got your data.
Say you want better storage capacity than
RAID1 and have no special requirements for write access, there is
RAID5 waiting. One Disk goes bust. Lucky you swap it out, wait until reconstruction is done. Everything is fine
On the other hand there is
Block Storage which abstracts from nitty gritty details of hardware. In principle does it something quite similar: Storing information redundant across several physical drives.
In which scenarios are
RAID-Solutions still the way to go?