[OliverGuy]

The NetApps are just disk shelves, can plug it into a SAS controller and use whatever software stack you please.

[tarasglek]

but they have multiple head nodes, so its some distributed setup or just active/passive type thing?

[nee1r]

We have a custom barebones solution that uses a hashring to route the files!

[hnav]

I'm guessing the client software (outside the dc) is responsible for enumerating all the nodes which all get their own IP.

[toast0]

I think each rack is one head node and several disk shelves (10?). No dual headed shelves.