> Plan is to replace disks with new and larger disks.
>
> So will pool get bigger just by replasing all 4 disks one-by-one ?
> And if it will get larger how this should be done , fail disks one-by-one .. 
> or ???
>
> Or is data backup and pool recreation only way to get bigger pool
>

There is another possibility. If you can retain the original smaller
disks in the pool then you have the option of adding the additional 4
larger disks as another raidz set. In that case the command would be
something like...

zpool add yourpool raidz disk1 disk2 disk3 disk4

The pool would then stripe across the 2 raidz sets with more I/O to
the larger raidz. In this case your new space would be immediately
available.

Since the 4 new disks are larger you could alternatively add a 3 disk
raidz to the pool and add the 4th new disk as a spare. That way I
think you could survive 2 disk failures in either pool as long as the
2nd failure didn't occur during resilver operation from the first
failure.

Regards,
Vic
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