How would I architecture Direct Attached Storage? This is a sequel question to a previous one.

I would like to set up a home networking solution with Direct Attached Storage.

"Direct Attached Storage" seems to suggest that I would run cables (Ethernet, presumably) from two Macs to some kind of medium.


What is that medium? In particular, are we talking here specifically about SATA RAID rather than RAID? IIUC the former requires running not Ethernet cables but SATA cables (can these be 30-40 ft long?), where the latter requires attaching via USB to an Airport Extreme or similar.
Is a third Mac needed to act as a server?
Is macOS server needed?
What is the name of the software that you would run to actually "serve"?
DAS means you connect one or multiple external hard discs locally (e.g. by USB or SATA)

1) Then, you share them from this computer. What you need are standard external USB drives and a working home network. 

2) You can share them using any Mac that is "always on" when the others are on

3) no, standard Mac OS will do

4) OSX. System preferences->Share->File Sharing

To connect, in the Finder select "Connect to Server..." under the Go menu.