Quote:
Originally Posted by HarryT
I honestly don't think that RAID is any "safer" than a normal disk. A few years ago I had a RAID 5 Buffalo NAS. The RAID controller failed and fried 3 of the four disks in the RAID array, meaning that had I not had (which obviously I did have!) a backup, I would have lost my data.
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You think correctly; it isn't. RAID (any form of it, such as 1 and 5) is not a backup. It is just a safeguard, providing you a chance, but not a guarantee, that you don't need to pull out your backup. Obviously, replacing a drive and rebuilding the array is much faster than copying back a huge multi-terabyte backup.
A RAID0 array, striping data over multiple disks, so read/write can use more than one disk at once, is actually built for speed, not for safety. If one disk in a RAID0 array fails, everything is gone.