How to setup cluster to prevent data corruption
Hello pros! Thank you for help in my previous question. Here is another one: I'm using Windows server 2008 and Exchange 2007 cluster in my environment. As SAN I'm using StarWind (it was suggested to me here too - thanx again :)) I'm wondering what is the recommended type of cluster for me to prevent data corruption on StarWind. I'd prefer real active-active High Available solution. Thank you
March 9th, 2010 3:58pm

CCR.-- Ed Crowley MVP"There are seldom good technological solutions to behavioral problems.". "ABAndrew" wrote in message news:bad16852-5b71-4e8b-8874-89a2dc08b701...Hello pros!Thank you for help in my previous question. Here is another one:I'm using Windows server 2008 and Exchange 2007 cluster in my environment. As SAN I'm using StarWind (it was suggested to me here too - thanx again :)) I'm wondering what is the recommended type of cluster for me to prevent data corruption on StarWind. I'd prefer real active-active High Available solution.Thank you Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
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March 9th, 2010 7:45pm

By the way, no cluster will prevent data corruption. What CCR will do for you is help ensure that data corruption is not replicated to the passive node's database. But there are no guarantees. It's entirely possible that StarWind, or any other storage subystem, will corrupt both copies of the data.-- Ed Crowley MVP"There are seldom good technological solutions to behavioral problems.". "ABAndrew" wrote in message news:bad16852-5b71-4e8b-8874-89a2dc08b701...Hello pros!Thank you for help in my previous question. Here is another one:I'm using Windows server 2008 and Exchange 2007 cluster in my environment. As SAN I'm using StarWind (it was suggested to me here too - thanx again :)) I'm wondering what is the recommended type of cluster for me to prevent data corruption on StarWind. I'd prefer real active-active High Available solution.Thank you Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
March 9th, 2010 7:47pm

Yes, I agree with Ed. CCR uses the database failure recovery functionality in Exchange 2007 to enable the continuous and asynchronous updating of a second copy of a database with the changes that have been made to the active copy of the database. Cluster Continuous Replicationhttp://technet.microsoft.com/en-us/library/bb124521(EXCHG.80).aspxRegards,Xiu
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March 12th, 2010 9:40am

For my money the best way is to combine CCR with standby continuous replication. And - the main goal for Exchange cluster is HA, but not performance. Thus, HA is more important than AA approach.
March 12th, 2010 12:36pm

I know you said Exchange 2007, and Ed's answer about CCR is correct in that context. Moving to Exchange 2010 gives you the expansion of the concept with the DAG where you can have the unit of failover be the database rather than the whole server and you can also have more than two copies and can configure one to be "lagged". In addition 2010 is able to backfill from one DAG member to another when some data corruption issues are found, which 2007 won't do.
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March 12th, 2010 7:09pm

An even better way is to go to Exchange 2010, which handles these kinds of things much better.-- Ed Crowley MVP"There are seldom good technological solutions to behavioral problems.". "Francisco Peula" wrote in message news:5c650e2f-5bc5-408d-a37e-4937a0dd1cab...For my money the best way is to combine CCR with standby continuous replication. And - the main goal for Exchange cluster is HA, but not performance. Thus, HA is more important than AA approach. Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
March 13th, 2010 11:20pm

Just to add :)As Ed mentioned, replication does not 100% prevent data corruption. As an example, this issue corupted the store and that corruption was replicated to the passive node:http://support.microsoft.com/?kbid=959135
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March 14th, 2010 4:56am

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