Ready for expansion (RN Pro Pioneer Edition)-Seeking Advice

StephenB wrote:
Though if you add 2 3 TB drives, the RAID volume will only expand by 2 TB. That's because you are using dual redundancy (you need 4 of the larger disks to use all the disk capacity in the array). It will expand later on (when you replace 2 existing 1TB drives with 3TB models)

Yep, I am following your notes from above where I upgrade 2 3TB's now, then 2 33TB's later as I need more space. I am thinking upgrading as space is needed vs in one shot now would save money as hard drive prices should decrease over time.

Are there any good reasons I should consider upgrading four 3TB's all at the same time?