I have 4 disks in the dataset, (1 x DRAID | 4 wide | 4.55 TiB - well, one is 6TB) but the total allocation shown is Usable Capacity: 4.42 TiB , and then Warning: Low Capacity … What is wrong here ?
DRAID is for large numbers of disks. You have 4
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At that number of disks and size, a raidz1 or mirror would serve you better.
Either way, remember to always have more than one copy of any important data.