I have the next configuration: 3 disk 1Gb in raid0
all disks in zfs pool

freespace on so raid is 1.5Gb and 1.5Gb is used.

so I have some questions:
1. If I don plan to use 3 disks in pool any more. How can I remove one of it?
2. Imaine one disk has failures. I want to replace it, but now I do not have 
disk 1Gb and have only 2Gb
 I replace disk of 1Gb with 2Gb, and after some time, I want to put 1Gb disk 
(as it was before) back.
with replace command i have error: device is too small
  How to return pool into beginning state?

Thank you.
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