[NV+ v2] 4 disks, 2 separate RAID-1 volumes?

PapaBear wrote:
...So, you are wasting the 1.5TB of space of one drive used for redundancy in two Raid-1 volumes that would not be used for redundancy in an X-Raid/2 volume...

I think you are missing his point.

illmatic fully understands the space tradeoff. At present he knows he is 33% efficient overall (6 drives between his backup and his NAS, when 2 drives are enough to hold his data w/o redundancy or backup). If he used XRAID-2, he knows he could eliminate one drive, moving to 40% efficiency.

He wants RAID-1 pairs anyway, and he doesn't view this as "wasting" anything - just like we don't view our backups as a "waste". "Waste" is a loaded word, it implies he gets no value in return. He's thought about the additional options RAID-1 gives him for recovering from future failures, and he's decided those options are worth the extra expense of one more drive.

This is really not any different from someone deciding they prefer dual redundancy over single redundancy. No one here would describe RAID-6 as "wasting" space, instead we think of it as extra protection that some people will want, but others might not.

Perhaps we should just agree to disagree, and move on?