If you are having challenges finding examples of multiple drive (more than two) RAID 1 implementations, try searching...
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on "triple mirror RAID". It has been a host operating system capability for 15-17 years. Storage system vendors and even application vendors like Oracle also support triple mirror RAID. Another implementation of multiple drive RAID 1 would be a hybrid RAID 0+1 or 1+0 also known as RAID 10. This implementation works well when, for example, six disk drives are used with three each in the two unique RAID groups that are then striped or mirrored together (this depends on whether you're using 0+1 or 1+0).
Another way of finding specific implementations is to look for vendors that implement a combination of horizontal and vertical RAID. This is where one RAID group is created horizontally across a group or shelf of disk drives and the other RAID group, using perhaps a different RAID level, is created vertically across the horizontal RAID groups usually more for performance than availability.
Dig Deeper on RAID
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