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Mailbox Server Switchver vs Failover

Is there any difference between doing a manual "Server Switchover" versus allowing the Mailbox Database to automatically failover to a passive copy in a DAG?

Technet article explains both and states that during a server failover for server hardware maintenance that "A passive database copy will be in the state that existed at the time when the system was shut down." http://technet.microsoft.com/en-us/library/dd298067(v=exchg.141).aspx

Is it possible to affect any client OWA, ActiveSync in even the smallest way for example if they had a draft open in Webmail for example?

If not what would be the reason to ever initiate a manual switchover prior to restarting a Mailbox Server?
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mroger_au
Asked:
mroger_au
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Switch over as you say is more of a Manual intervention to get the second server up and running more like LAG

DAG failover is quick and shouldnt affect, LAG is a bit time consuming and could be some issues

My question how would you instantaneously understand you need to do Manual failover ?

- Rancy
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mroger_auAuthor Commented:
I am wondering if I need to restart a mailbox server for system maintenance if there is any reason why I shouldn't just reboot it and let the passive database take over.

Is there any reason to do a manual "Switchover Server" from the EMC prior to restarting a Mailbox server? Or do system maintenance outside of business hours?
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
No if its DAG it should be automatic but for ensureing no donwtime you can switch over and After Production hours is the best way forwrad

- Rancy
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mroger_auAuthor Commented:
OK. But from a technical point of view as long as the DAG is working as designed it is not possible for any client to lose even a single email while the databases failover?
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Yes no emails should be lost even in Failover mode

- Rancy
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