I am owner of two sites " A & B". Site A will be the live site and established two CAS/HUB servers configured within a CAS Array and 2 MBX servers. Where as Site B established with a single CAS/HUB server as well as a single MBX server. Entire three MBX servers are configured within a DAG array and the CAS/HUB in Site B will only be implemented in case of a complete Site A failure. Last night, I have checked the efficiency of the CAS array by turning off one of the CAS/HUB servers. When the server turned off, we were not able to open up the OWA or do any client access functions. As soon as, it came back up all of thing and was well.
I executed the get-mailboxdatabase | fl *rpcclientaccess*,name and all my databases sections to the CAS Array. What can I see at as a cause for my NLB CAS array getting failed when turning off just one of the servers within the array.
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