Upgrading old RAID-Z10 pool to RAID-Z2 ?

[Gorge50]

Hi,

I've recently upgraded my old DIY NAS to enterprise hardware from Supermicro and now the time has come for my old disks to get replaced.
Currently there are 4 x WD Red 6TB and 4 x WD Red 3TB disks in my ZFS RAIDZ1+0 configuration, giving me access to 50% of available storage. Amount of available RAM on server is 128GB. See images below.

1.0 Disks

1.1 ZFS pool

These drives are to be replaced by 8 x Seagate Exos 16TB drives (will add 4 more disks later on) and I am looking into what configuration would be most optimal for me, my requirements are speed and realibility - money is not a issue and I can live with 50% available storage (I've been doing it so far ;)). As far as I've understood RAID-Z2 is the new kid on the block since all those years back I've put together my ZFS pool and it seems to be the recommended configuration. Am I right and what sort of performance difference am I looking at when compared to current setup if switching to RAID-Z2?

Also, any recommendations how I would go about upgrading or replacing the old pool? There are 12 hot swap bays in the Supermicro case, 8 of those are taken up by WD Red disks to be replaced.

 

[blueether]

ZFS mirrors will give much better IOPs than raidz2, but you could do 2 6 drive wide raidz2 vdevs in the pool to give better IOPs than a single vdev.

mirrored pairs are also easier to expand at a latter date by adding a new pair to.

I guess the question then becomes what are your use case and how much read/write speed do you need?

 

[Gorge50]

ZFS mirrors will give much better IOPs than raidz2, but you could do 2 6 drive wide raidz2 vdevs in the pool to give better IOPs than a single vdev.

mirrored pairs are also easier to expand at a latter date by adding a new pair to.

I guess the question then becomes what are your use case and how much read/write speed do you need?

Use case: vault (private data) and surveillance storage as well as streaming 4K material to the few Kodi boxes we have at home and 2 jails running some services.

I assume the ideal configuration right now would be 6 drives in RAID-Z2 configuration (pool 1) and a mirrored pair of disks for vault in separate pool (pool 2). What would be the easiest solution of moving data from current pool to new? rsync?