Updated Erasure Coding for warm storage (markdown)

Erasure-Coding-for-warm-storage.md

@@ -49,6 +49,8 @@ The scripts have 3 steps related to erasure coding.
 
 The default command is `ec.encode -fullPercent=95 -quietFor=1h`. It will find volumes at least 95% of the maximum volume size, which is usually 30GB, and have no updates for 1 hour.
 
+If the volume is replicated, only one copy will be erasure encoded. All the original copies will be purged after a successful erasure encoding.
+
 Note: One collection can contain both normal volumes and erasure coded volumes, with write requests going to normal volumes.
 
 ### Data Repair