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Why do you want raid?
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Why raid when you can just store locally and sync an encrypted backup with the cloud?
Cheaper...more secure...more resilient...
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One answer to this is Unraid. It is not RAID, but uses a dedicated parity drive. So you can start with e.g. a pair of 8 TB drives, one data and one parity, and then add more 8TB data drives to the array as you need them, without rebuilding the array (you need to take it offline briefly though). Main downside is slow writes, but you can put e.g. databases on an SSD instead (which could be a RAID0 pair).
root
Stonehedge
chez_jay
@Mr_Sworld
Raid arrays. Talk to me.
I need to build a new plex server. Is there anyway to have a raid system that you can gradually add HDD's to without rebuilding the entire array every time?
I have a feeling the answer may be 'No'.