Home NAS drive and RAID choice

Soldato
Joined
22 Feb 2014
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2,776
Current home NAS has 5 x 4TB WD Reds (CMR) in RAID Z-2, I bought an additional 4 drives around 18 months ago and am just now getting around to installing them.

Would it be better to have 2 larger drives (18TB for example) in RAID1 and lose a bit of capacity
or just stick the 4 new drives in and go for RAID-z 2or3.
Current drives will be roughly 20,000 hours old at this stage with no SMART errors currently

If I sell all of my current drives I'm looking at around £500ish, I can pickup 2 x Exos 18TB drives for £300 each, so It will cost more and I lose capacity.
 
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