creating a DAG

My current exchange environment is one Mailstore server,  one cas/hub server ( cas and hub is on the same server)

my company is cheap, so my question is can i use install a second mailstore server and create a DAG without install another cas/hub server?

Trying to figure a way to create some redundancy

thank you for helping out.
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Will SzymkowskiSenior Solution ArchitectCommented:
Yes you can install another MAILBOX Server Role on another server, and then configure DAG. However as you know you are only redundant on the Mailbox Role. If CAS is lost you will not be able to connect to your mailbox.

But to answer your question, the answer is Yes you can do this.

AmitIT ArchitectCommented:
You can do it, If your current server is running on Window Enterprise version.
Stelian StanIT Services ManagerCommented:
Like Will and Amit mentioned above you can do that, but why not have all the roles on one sever an then install the second server with all roles and make it part of a DAG.
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Will SzymkowskiSenior Solution ArchitectCommented:
Having multiple CAS in the same Active Directory domain, where they are not load balanced will create issues because now they will be dependant on each other.

Meaning, when you add a second CAS server this object gets stored in Active Directory. If there is no load balancing mechanism in place if one of the CAS servers goes offline Active Directory will continue to send requests to both CAS servers because they are not properly load balanced. When you are using load balancing this tells active directory which CAS server to send to.

So if you are not load balancing CAS in the same site it would be recommended to only have one.

AmitIT ArchitectCommented:
What is your Exchange version. If you ask my suggestion. Setting up High availability is a complex task. Just setting up DAG is not enough. Lot of other factors play major role in setting up Exchange HA. Which could be a costly solution. Like you need HLB for load balance. Setting up new server means new hardware, new OS and Exchange license. If I am in  your place, I might just run the current server with regular full backup every day or plan to move to Office 365. Which will give me all this without any headache of having new server etc.

According to my experience HA is not required for every org.

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Simon Butler (Sembee)ConsultantCommented:
If the site is small, then the free Kemp load balancer might work for a cheap HLB.

sirichaiphumiratAuthor Commented:
thanks everyone,

Amit, our current setup are all VMs and is exchange enterprise sp3 rollup 9.  My company doesn't want spend to much money at the moment because we are planning to move over to 2013.  So in the mean time we want to be able to have a little bit of HA, for the mailboxes at least.

the current size of our system is about 1600 email accounts. So its not that big
AmitIT ArchitectCommented:
What is OS version? You need win 2008 enterprise edition. Better setup 2013 with HA and migrate it to 2013. If you can wait for next few months move directly to 2016.
sirichaiphumiratAuthor Commented:
Yes I have windows 2008 enterprise edition.     Any good you guy recommend for a good how to on setting up a DAG?
Will SzymkowskiSenior Solution ArchitectCommented:
Here is a complete step-by-step guide on setting up an Exchange 2010 DAG.

AmitIT ArchitectCommented:
There are several articles and Videos available  for setting up dag. One is posted by Will above, review it.
sirichaiphumiratAuthor Commented:
great thank you guys!!!
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