Question in regards to installing exchange 2010

I need to setup 4 servers with exchange 2010. They will be in a DAG
2 Will be CAS and 2 will be Mailbox servers.
Question is, do I need to add just the CAS role to the CAS servers and then for the mailbox servers they will get the mailbox role and the as far as the HUB role, does that need to be on the CAS server or the mailbox server?
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vmichAsked:
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Aanand Singh KarkiConnect With a Mentor Associate ConsultantCommented:
yes exactly.....Windows NLB is much cost effective and reliable solution for CAS HA...

Regards,
Aanand Singh
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vmichAuthor Commented:
I think I answered my own question..
I can install the 2 CAS servers first along with the HUB transport role on them.
Then when these 2 servers are done I will install the mailbox role on the other 2 servers...
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vmichAuthor Commented:
Is my answer correct or do I need the hub also on the mailbox servers
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Aanand Singh KarkiAssociate ConsultantCommented:
Hi Vmich,

As per best Practice you should keep CAS and HUB server on same servers (CAS servers will have Windows NLB for High availability) or else you have to invest on third party Hardwere Load Balancer. and you can keep mailbox role on remaining servers and configure as member of DAG for mailbox HA.

but there is no hard n fast rule for keeping Hub role on CAS but as mailbox role is already very resource intensive hence MS recommends to collocate HUB n CAS.
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vmichAuthor Commented:
The other question I have is in regards to the 2 cas servers. I will be setting up the 2 cas servers with the cas and hub roles on them.
Do I need to setup anything else with them as far as having them be redundant in the case that one fails the other one will take over?
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Aanand Singh KarkiAssociate ConsultantCommented:
HI Vmich,

CAS Server HA is performed by Windows Network Load Balancing Feature (Native) or any third party H/W Load Balance. CAS Can't be Active/Passive, you have to Set you OWA, Autodiscover, Web Service url to your CAS Server Virtual IP Address (NLB IP). for HUB you don't have to do anything..they automatically work in DNS Round Robin Fashion if deployed in the same AD Site.
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vmichAuthor Commented:
So basically setup NLB for between the 2 CAS servers if they don't want to purchase a HW appliance?
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vmichAuthor Commented:
solved
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