With those add-ons it will become a bastard array (balance wise) either way. Moving disks around will take time and with 70 drives split on 5 cages it will never get balanced anyways.
You should try to get 16x 1.8TB FC drives per cage. For SSDs it doesn't matter that much as they're unlikely to get into any performance issues on a per-SSD level. If you're aiming for HA cage you should have the same amount of capacity in each cage but the size and number of SSD doesn't matter that much.
_________________ The views and opinions expressed are my own and do not necessarily reflect those of my current or previous employers.
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