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Exchange 2010 high availability and site failover

Posted on 2011-03-12
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Last Modified: 2012-05-11
Dear All,
i have clarifications regarding exchange 2010 High availability.
the current environment two sites, site A and site B connected through 1Gb link.
Site A:
2 edge Load ballanced
2 CAS servers (cas array)
2 HUB servers
2 MBX

Site B:
1 Edge
1 CAS
1 HUB
1 MBX

High availibilty will be configured as below:

Cas servers:
Cas array on site A, in case of site failure we should point the cas array to site B cas server

Hub Server:
two send connectors will be created on the edge servers with different cost.
send connector A: will have the 2 HUB servers on site A  with cost 1
send connector B: will have only the HUB server on site B with cost 10  

incoming Email and owa:
creation of two MX records, so two A records should be there for the same name, for example:
for site A:  SmtpA     10.10.10.10 TTL 1h
for site B:  SmtpB    10.10.10.11 TTL 1h

MX records:
site A:  MXA   smtpA priority 0
site B:  MXB    smtpB priority 10

OWA:
Site A   OwaA smtpA
Site B   Owa B smtpB (manually created after site a fails)

my questions:

1- is there a way to make cas servers failover automatically?
2- this is the way to configure Hub servers failover?
3- how long does it take to start using MXB in case of site A failure and is it automatic
4- how to configure OWA failover, is there a away to makes it automatic?
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Question by:ABCQAT
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by:Akhater
ID: 35120202
1- is there a way to make cas servers failover automatically?
No

2- this is the way to configure Hub servers failover?
Didnt get this one, what do you mean ?

3- how long does it take to start using MXB in case of site A failure and is it automatic
Automatic in your case

4- how to configure OWA failover, is there a away to makes it automatic?
Nop you can just create the record owa.domain.com pointing to site a and low ttl, an in case of failure change te ip to site B
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by:ABCQAT
ID: 35120463
thank you for your answer,

for question number 2 i mean:

Hub Server:
two send connectors will be created on the edge servers with different cost.
send connector A: will have the 2 HUB servers on site A  with cost 1
send connector B: will have only the HUB server on site B with cost 10  

this the way of failing over the HUB servers or there is an other way, coz i couldn't find something on the net.
so by creating two send connectors with different cost, and configuring each connectors with  different source servers, than if on coonector (site A) goes down the second connector (site B) will be used.

Note: source servers can be configured via Scoped send connector


is this correct or not?  
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by:Akhater
ID: 35121096
when u create two send connectors with different costs I am afraid only the one with the lowest cost will be used
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Author Comment

by:ABCQAT
ID: 35121401
well lets say, the connector with the lowest is for site A, then its ok to be the only one to be used.
but the question if site A is down, will the mails will go through the connector of site B autamatically?

if this is not gonna work, than how we configure HUB servers to fail over?

this is the only missing part in my design, MBX is ok CAS is OK, EDGE is fine, i still need to know how we failover  HUB server
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Expert Comment

by:Akhater
ID: 35121470
you will need to disable the connector of site a for them to be routed to siteb
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Expert Comment

by:Akhater
ID: 35121503
wait u said edge? Are we talking about exchange edge? Where do u have edge servers?
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Author Comment

by:ABCQAT
ID: 35121857
yes two edge servers load balanced, you can see the configuration of the sites in my 1st message.
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Akhater earned 500 total points
ID: 35121980
sorry i missed this ! Your edge have edge subscription and will talk with hub servers in the same site only
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