New Exchange 2010 Build - Datastores and Logs

I am in the process of architecting a new Exchange build for my organization.  My question is how to provision the storage, all in a vSphere deployment.  We are planning a complex DAG with multiple mailbox servers.  My question is, which storage plan should I got with.  A) LUN-A, dedicated storage for the server's main datastores and logs, LUN-B, dedicated storage for the server's backup copies of other datastores and logs.  Plan B), LUN-A, Primary and backup datastores on the same LUN, LUN-B, Primary and backup logs on the same LUN.  Basically, should I segregate the datastores and logs, or should I segregate the primary and backup datastores/logs??

Thank you for any and all posts,
John
cbitsupportAsked:
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UrlrynCommented:
In regards to either plan....both will work just fine.

Currently we have one LUN partitioned for each active logs/database and then a second LUN  partitioned for each of the passive databases/logs.

This setup also simplifies things for the backup team when needed so they aren't looking for separate locations for the logs and databases.
MarinertekCommented:
I think Plan A makes more sense for redundancy, if you were to go with Plan B and LUN-A were to become corrupt you would lose both your primary and backup datastores. Unless you have different RAID settings or disk types for the different LUNs for performance there would not be an advantage to putting the logs and the datastores in different places.  

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cbitsupportAuthor Commented:
My orignal idea was to do plan A but after some reading most best practices docs recommend spliting the databases/logs.  I totally agree it will be simpler to manage for backups and with it all being on the same SAN the preformance should be the same regardless of the LUN.
MarinertekCommented:
Out of curiosity is the best practice related to performance or to redundancy?

Vmware also has a best practices for Exchange 2010 in vSphere

http://www.vmware.com/files/pdf/Exchange_2010_on_VMware_-_Best_Practices_Guide.pdf

I would also check out the PVSCSI adapter if you have not already

http://kb.vmware.com/kb/1010398
cbitsupportAuthor Commented:
I do plan to use a PVSCSI adapter.  The best practice for splitting the DBs/Logs is for performance.  Thank you both for your quick responses and for validating my plans.
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