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> No idea if this has filtered through to mainstream release yet, but it was announced almost 18 months ago.

What was announced?

That you will, when the PR is considered fully stable and good to go, be able to add drives to a RAIDZ vdev.

Here we are - https://arstechnica.com/gadgets/2021/06/raidz-expansion-code...

When I built my home storage server I made a mistake, and thought I could fit an additional drive, but I ran out of SATA ports. I kept the extra drive as a cold swap and just set up a raidz array.

I ended up freeing up that SATA port I needed, but I'm waiting just a bit longer to expand ZFS on to that last drive so this code can get juuusstt a bit more testing!

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