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non parity array or parity disk exclusion

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The request starts from a need: I have a lot of backup data that really I don't care.

For what is my current unRaid knowledge unassigned disks are going to be unsupported.

Unassigned disk are not featuring smart array features as data spanning over multiple HDD.


I don't know if is best to implement it as:

- put all drives in the array and exclude some from parity

- manage a non parity array


Or maybe this already exists and I am a total newbye?!?!




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First I must ask, why do you need your backup data to be not on the array? Are you concerned about speed? Number of disks perhaps? 


To your specific questions.

-You cannot exclude array drives from parity protection. 

-You can have a cache pool (and in an upcoming version multiple cache pools) where drives can be combined in RAID0.

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