When walking through the steps " How to Install Update Rollups in a Single Copy Cluster" It say I only need to run these three cmd's but how do I find out which of my machines is NODE B and whic is A? http://technet.microsoft.com/en-us/library/bb885045(EXCHG.80).aspx

Hi, Referring step 1 in the link under procedure, NodeB is the passive node of your cluster and NodeA is the active cluster node where all of the cluster resources are active. You can run Get-ClusteredMailboxServerStatus to see which node is active and which is passive. Below is the sample output of this command for cluster name CMS1. Get-ClusteredMailboxServerStatus -Identity:CMS1 Identity: CMS1,66ece5af-1c91-421e-a460-a0c864d38968 ClusteredMailboxServerName : CMS1.contoso.com State: Partially Online OperationalMachines: {CMS-Node1 <Active>, CMS-Node2} FailedResources: {<Second Storage Group>/<Public Folder Database> -- Offlin e} IsValid: True ObjectState : Unchanged