Upgrade storage, how to proceed?

[Dunuin]

"Direct Attach Cable" = a fixed SFP+ copper cable instead of a pair of tranceivers and fibre.

 

[reynierpm]

What are your thoughts on this Dell 710? Would it work for what I want?

 

[ubu]

What does DAC means?

It is DAS (Direct Attached Storage) https://en.wikipedia.org/wiki/Direct-attached_storage

 

[reynierpm]

You would need 2 SSD for redundancy, the do not need to be especially big, it is just read / write cache.

I already purchased two NvME SSD disks 120G each, but how would I connect them as redundant? If I am not misunderstanding you this would be where PVE gets installed, right?