One more note,

> For example, if you were to remake the pool (as suggested above for rpool and
> below for raidz data pool) - where would you re-get the original data for 
> copying
> over again?

Of course, if you take on with the idea of buying 4 drives and building a 
raidz1 vdev
right away, and if you actually moved (deleted) the data from the NTFS disk, you
should start by creating this new pool with a complete raidz1 vdev.

Then you transfer (copy then delete) data to it from your current ZFS pool and 
only
then you remake/migrate the root pool if needed. 

Perhaps it would make sense to start with a faked raidz1 array (along with a 
new 
smaller root pool on its drives) made of just 3 more 1Tb disks, so you would 
just 
recycle and add your current zfs drive as a parity disk to this pool after all 
is 
complete.

As you see, there's lots of options depending on budget, creativity and other 
factors. It is possible that in the course of your quest you'll try several of 
them.

Starting out with a transactionable approach (i.e. not deleting the originals 
until
necessary) pays off in such cases.

//Jim
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