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This assumes you have used /dev/sdb1 vs /dev/sdb and you want to grow /dev/sdb1.

Fire up a LiveISO and GParted for the GUI, but really you'll need the CLI for this.

Use GParted to delete/clear space after ZFS partition.

Then use parted to resize ZFS partitions like so:

https://www.tecmint.com/parted-command-to-create-resize-rescue-linux-disk-partitions/


parted /dev/sdb

print

resizepart

1

4000GB (4TB)

print

quit

Refresh GParted to confirm!

Before closing LiveOS I would consider disable ZFS automount in prod system, boot, configure, test and then re-enable, reboot confirm.

To Grow from real OS once booted back:

zpool list
zpool online -e poolname /dev/
zpool list



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