Initializing Storage Groups…

This is a nice blog from Tim McMichael (a Microsoft Escalation Engineer)…  If you want to know why replicated storage groups sometimes appear to be initializing have a read.

Get-storagegroupcopystatus = Initializing

“When storage groups are in an initializing state commandlets report that action cannot be taken because replication is failed. It really is not about replication being failed but more that replication is in any other state but healthy. Other conditions that we see the initializing state is post VSS backups of the passive database copies or when an replication instance is suspended and resumed.”

And have a look here for related blogs:

Need to clarify something about log roll and continuous replication 
New log created every 90 seconds… 
White Paper: Continuous Replication Deep Dive