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Exchange 2010 LUN design question

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Last Modified: 2012-08-13
hello, we are designing our EX2010 architecture and i have a question about the spindle design.
i have the DB and Logs on separate raid groups [spindles] however for performance should i also create a separate raid group for the smtp write directory? [in ex2003 it was the mailroot/vsi1 directory.

thx - S.
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i wouldn't worry too much about SMTP to be honest with you as the speed of outgoing e-mails will be dicated more by your internet connection

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Commented:
would you happen to know which directory the EX2010 mailbox server use to do the SMTP writes?
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Commented:
Thanks for the info Matt. so in the DAG mailbox storage design, should i just carve out a separate RG/LUN for Database and Logs. so basically, 2 LUNs per Database on separate spindles
is there any other LUN  or separate spindles i would need to create for the DAG mailbox servers?

tigermattSite Reliability Engineer
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Commented:

The thing to remember with a DAG is it isn't designed for shared storage, so whichever way you go about it, you'll need separate LUNs for database + logs for each member server in the DAG. In fact, a DAG is quite happy running off the local storage in the separate servers...

So yes, 2 LUNs per database (one per DAG member) should be fine. If you have an even number of DAG servers, you'd need a third box to site your witness server on (used to ensure there's always a majority vote to maintain quorum and prevent a split brain cluster when there's an even number of members in the cluster). However this will quite happily sit on a separate Hub Transport server or just another member server on your network. It requires just a few megabytes at most, so doesn't need a dedicated box or its own LUN, just a third physical box you're happy to site it on.

Clearly if you're using LUNs on a SAN you'll want to ensure the SAN has redundancy so that's not a single point of failure in your DAG, but I'm sure you've considered that. :)

Best of luck with this endeavour!

Matt

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