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restore server hardware to existing stores

Posted on 2008-10-21
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Hi,
I have a boss who wants high availability with Exchange 2007, but on a low budget.  He currently has a single 2003 exchange server.  We are planning to deploy a 2007 exchange server later this year.  He is proposing that we build the server, the OS will be on a server box, and the store will live on a SAN.  He wants this setup so we have a second cold server, so if the main server fails he can bring the second server on line and be up and running in short order.  I am not sure if this is possible, maybe if we ghosted the server after it is fully configured?
The public store is about 50 gig and the private store is about 25 gig, I expect them to double of the next couple of years.  There are about 100 mailboxes.
Please advise.
Thanks - Wayne
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Question by:wspjones99
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by:Bertling
ID: 22769165
ok from what you are asking you want to deploy an exchange single copy cluster.
you will have 2 exchange 2007 servers 1 active and 1 passive and both have access to the SAN where the databases will be accessed.
if one failes then the other one takes over
you will need:
2 x Server 2003 or 2008 ENTEPRISE
2 x Exchange 2007 sp1 ENTERPRISE (mailbox role only) (for 2 cluster nodes)
1 x Exchange 2007 sp1 STANDARD to host the rest of the roles required like hub transport and client access etc.
http://www.msexchange.org/tutorials/Installing-Two-Node-Exchange-Server-2007-Single-Copy-Cluster-Virtual-Server-Environment-Part1.html
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by:Bertling
ID: 22769219
i would also like to add the guide at msexchange.org they use virtual server 2005 r2 to do this as they dont have all the physical servers and SAN like you will have so you can ignore those bits as you are working with physical servers.
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by:wspjones99
ID: 22769531
Hi,
Thanks for the info.  What I need to relate to the boss is whether or not his proposal is feasible.  
That is:
Keeping a cold exchange server, and being able to bring it on line if the main exchange server goes down, and being able to attach to the store that is located on the SAN unit.  I have to be able to explain why this cannot be done, or if it could be done what steps are required and the time frame to do it in.  He seems to think it would be as easy as bringing up the cold server and attaching the store. He wants to accomplish this without replication.
The public store is up to about 50 gig and the private store is about 25 gig.
Thanks - Wayne
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Bertling earned 250 total points
ID: 22769898
ok first thing regarding the store sizes you are fine and well in the default limit of 150gb. How ever if you do start to reach 150gb you just have to change a Dword in the registry on the exchange server to increment it. This can be set up to 16TB!! so you will never have an issue with your DB being to large.

the next thing, your boss is asking if in the event of a failure of the main exchange server, you will power on another installed exchange 2007 server within your exchange organisation which you can then mount the databases which are located on the SAN. This will work fine but require a few things to change before you mount the databases. This also can be very risky in the fact that the databases might not mount right off. here is a good guide which explanes the steps to make another exchange server in the organisation mount the databases and server the clients: http://www.msexchange.org/tutorials/Moving-Exchange-Server-2007-database-Mailbox-servers.html

a better and more reliable way of doing that would be to purchase something called double take which will automate the process in the event of the first server dies: www.double-take.com.

however with what your boss is asking, and as you already have the SAN in place i would stronly advise the SCC option i recomended. it is totaly automated and works very well. the down time will be around 2 to 3 mins before the other one take the roles.

your boss is asking for a hot standby server which will be powered on in the event the first exchange fails. then mount the databases. a single copy cluster in exchange 2007 will do just that but it will failover and mount the databases without you doing any thing what so ever. Why will your boss not like this option.

in my oppinion i would recomend the single copy cluster as your first option to present. As you have the SAN.

then double-take

then the manuall process which may or may not work first time.
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