Hi Jamie,  Volume collection won't effect space or replication.  A collection means you want all these volumes to be replicated or snapped at the same time.   Typically because they are inter related.  I.e. data and log volumes.   You have to either promote or clone a replica to gain access to it.   While promoted replication won't run. on that volume.   regards, 
I just configured traditional replication between two dell equallogic ps 6000xv series arrays. I managed to move all vdi's i wanted to move. I first created volume collections and moved these in batches of the maximum limit of eight. i have just realized that from the source group i have used up so much space and i am running out. If i delete my volume collections will this disturb my replicated volumes on the partner? which i want to use with another machine to recover the replicated volumes. do i have to promote the replica collections to volumes before i attempt to boot from them?
replication