SERVER-21384 Enable replica set suites for in-memory storage engines

1 files changed, 7 insertions, 0 deletions

diff --git a/jstests/replsets/rollback_collMod_PowerOf2Sizes.js b/jstests/replsets/rollback_collMod_PowerOf2Sizes.js
index 376ef081823..2032f9a584b 100644
--- a/jstests/replsets/rollback_collMod_PowerOf2Sizes.js
+++ b/jstests/replsets/rollback_collMod_PowerOf2Sizes.js
@@ -1,4 +1,11 @@
 // Test that a rollback of collModding usePowerOf2Sizes and validator can be rolled back.
+//
+// If all data-bearing nodes in a replica set are using an ephemeral storage engine, the set will
+// not be able to survive a scenario where all data-bearing nodes are down simultaneously. In such a
+// scenario, none of the members will have any data, and upon restart will each look for a member to
+// inital sync from, so no primary will be elected. This test induces such a scenario, so cannot be
+// run on ephemeral storage engines.
+// @tags: [requires_persistence]
 (function() {
 "use strict";