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Cc: freebsd-questions@freebsd.org, Oscar Hodgson <oscar.hodgson@gmail.com>
Subject: Re: Anyone using freebsd ZFS for large storage servers?
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>> level?
>>
>>
>
> It was my impression that ZFS doesn't actually format the disk as

does any filesystem "format" a disk?
disks are nowadays factory formatted.

filesystem only write data and it's metadata on it.

I really recommend you to get basic knowledge of how (any) filesystem 
works.

THEN please discuss things.