J
J.Clarke
My two hard drives are in a RAID 1.5 array. It uses raid 1 and raid
5.
Not quite. They did something clever--they mirrored the drives
structuring the data in such a manner that if both drives are working
then it can be accessed using striping, but if one fails then it runs
entirely from the single drive. It's not RAID 5, which requires 3
drives, it's "RAID one and a half".
If one hard drive fails, replace it and the array is rebuilt with
absolutely no data loss. The only way you lose your data is if BOTH
hard drives fail at the same time. The chances of this happening with
300,000 hour MTBF drives is something like 1 in 150 million years.
Be nice if it was really that good. It's not. The trouble is that
you're assuming that the drive failure does not have an external cause
that will bring down both drives at the same time, and that it will not
fail in such a manner as to damage the other drive.