SOLVED: Step-by-step process to migrate or upgrade a pool, e.g., 2 disks --> 4 disks

[Stux]

Yes. See pics in this thread:

RaidZ Expansion on ElectricEel Nightlies

Hello! Support for RaidZ Vdev Expansion is now available in ElectricEel Nightlies. For those who do not know its a new feature that allows to extend an existing raidz vdev with another disk, e.g. from a 5 wide raidz to a 6 wide raidz. [image] Extend button is available when clicking in the top level raidz vdev on the pool status page. [image] As you can see, the caveat of this operation is that the parity ratio is maintained. That essentially means the usable capacity will be lower when …