Quick Question....

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D

David Humber



How long can an Exchange 2010 Hub Transport run with out the Active Directory? Assuming that it only needs to forward messages to a smart host.

The scenario is one in which no DC's are available for the HT server to communicate with so alerts are generated from SCOM to send email to external addresses through the HT.

Thanks,

Dave
 
B

busbar

the AD topology checks for DCs every 15 min, however the HUB server can perform since information is cached, it will require contacting AD only when sending or receiving and requiring retrieving new information from AD.Regards, Mahmoud Magdy Watch Arabic Level 300 Videos about Exchange 2010 here: http://vimeo.com/user3271816 Read pretty advanced Exchange stuff I post here: http://www.enowconsulting.com/ese/blog.asp, follow my blog: http://autodiscover.wordpress.com , corp blog: http://ingazat.wordpress.com and if you Liked my post please mark it as helpful and accept it as an answer
 
D

David Humber



Does the cache have a TTL so that it would expire at some point forcing the HT to make a request and thus queue external email? I understand the topology check every 15 minutes, and if the HT does not get a response it would continue to use its current cache, but does the cache have a finite shelf life in the server?

Thanks,
 
B

Brian Day MCITP



In what situation would you have all DCs go down? Email might be the last concern at that point. :)

 
D

David Humber



Say it's the worst case scenario, link is down between AD sites and you've lost your local DC's in a SAN failure or SAN fabric failures. My client does not want to rule out any possiblity.

They just want to be paged in the event of such a failure via email from SCOM
 
B

Brian Day MCITP

Then don't put the DCs on the SAN. :) I kid I kid! Seriously though... if they are truly worried about that then they should design out any single points of failure in the SAN itself becasue if the DC goes down lots more than Exchange will be unhappy.
 
D

David Humber



I agree!

They want to count every possibility though. Even with eliminating all single points of failure they still want to know what happens with a multiple point failure. I suspect that the 15 minutes before the HT's cache is exhausted is enough, because as you said after that you have a lot bigger problems with no DCs!

Thanks,

Dave
 
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