To determine whether a mailbox server is clustered or standalone, and if clustered – whether it’s using Cluster Continuous Replication (CCR) or Single Copy Cluster (SCC), use the following command:
Get-MailboxServer | select name,ClusteredStorageType
The possible values:
1. NonShared = CCR cluster
2. Shared = SCC cluster
3. Disabled = standalone / non-clustered mailbox server