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Another Method:

Whatever you choose, don't use "/dev/sdb" use something under /dev/disk/. Anything will work.

Lets say you want to make this change after the fact, before you add a new disk perhaps.

Fairly simple, like so:

Note: took me a minute to figure this out, don't actually put the PARTUUID, just the directory and ZFS will figure it out for you.

zpool export poolname
zpool import -d /dev/disk/by-id/ poolname -o ashift=12


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