move zfs geli encrypt mirror to unencrypted

[Steve O'Hara-Smith]

On Tue, 27 Oct 2020 14:44:50 +0100
xpetrl <xpetrl at beepc.ch> wrote:

> Do I miss a step?

	It just hit me that geli may be blocking access to the raw device,
you probably need to geli detach it before you can use it.

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Steve O'Hara-Smith                          |   Directable Mirror Arrays
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