So when I go into storage -> volumes -> volume manager
Create a volume name (such as "tank") and under Volume layout do I only select 8 disks then press Add Extra Device and add another 8 disks until I have 3 vdev's of 8 disks?
Also, can this be done via the manual setup?

Create a volume name (such as "tank") and under Volume layout do I only select 8 disks then press Add Extra Device and add another 8 disks until I have 3 vdev's of 8 disks?
Also, can this be done via the manual setup?