Use	Set size	Data protection	High Availability	Notes
	1	No	No	Must use --journal to protect against crashes
	2	Yes	No	On loss of one member, set becomes read-only
|008800|✔|	3	Yes	Yes - 1 failure	On loss of one member, two surviving nodes can elect new primary
	4	Yes	Yes - 1 failure	On loss of two members, two surviving nodes are read-only
|008800|✔|	5	Yes	Yes - 2 failures	On loss of two members, three surviving nodes can elect new primary