2 drives doesn't get you protection from raid-5 (SHR). You need minimum 3. With 3 drives the data is spread out and backed up by checksums. If any one drive goes down you just swap in another and the raid rebuilds itself. If you have Costco membership get 3 of these and shuck them.
Also if you're not in a hurry wait for the next Rakuten promotion with Dell and get it from Dell. Or keep watching Amazon, the 920 has been below $600 past few months.
Also if you're not in a hurry wait for the next Rakuten promotion with Dell and get it from Dell. Or keep watching Amazon, the 920 has been below $600 past few months.