Upgrade storage, how to proceed?

"Direct Attach Cable" = a fixed SFP+ copper cable instead of a pair of tranceivers and fibre.
 
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?
 
Bump....Planning on upgrading my 1TB ZFS to a new 2TB zfs.....can I just "zfs send" everything to the new drive?
My nuc can only take 1 ssd so I need to check I have an external case or if I need to buy one.
 

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