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Replacing drive in mirror with smaller one

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I have a boot zfspool with 3 mirrored devices. 2 16GB usb drives and one old 128GB SSD.

Unfortunately the SSD just died so I wanted to replace it with another 16GB USB drive (the exact same type of the other already mirrored 2)
But when I try to replace it (in the WebGUI) I get an error that the drive is too small.
Do I need a drive wich is 128GB big? Even if the others are only 16GB?

If so, can I remove the (already removed) SSD from the pool for good and add another 16GB usb mirror?...

Replacing drive in mirror with smaller one

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