Exchange 2007 and Domain controllers 64bit

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jwilmer - 20 Feb 2008 15:06 GMT

All

We have been told that when we migrate over to Exch2007 and 64 bit OS that
we should also migrate all of our DCs over to 64 bit.

We were told this is considered a best practice and that Exch 2007 will see
big performance improvements if DC are 64 bit.

Has anyone heard this??? Comments

Thanks Again

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Jetze Mellema (MS MVP) - 20 Feb 2008 15:15 GMT

> We have been told that when we migrate over to Exch2007 and 64 bit OS that
> we should also migrate all of our DCs over to 64 bit.

> We were told this is considered a best practice and that Exch 2007 will
> see
> big performance improvements if DC are 64 bit.

Big improvements? I'm not sure, I guess it depends on your environment.

See http://technet.microsoft.com/en-us/library/aa996719(EXCHG.80).aspx
"The use of 64-bit Active Directory domain controllers increases directory
service performance. In previous versions of Exchange, we recommended a 4:1
ratio of Exchange processors to global catalog server processors, assuming
that the processors are of similar models and speeds. This recommendation
still applies in Exchange 2007."

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Jetze Mellema (MS MVP)
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Oliver Moazzezi [MVP] - 20 Feb 2008 16:46 GMT

You increase your Directory to Exchange processor ration from 4:1 to 8:1, as
long as there is enough ram in the 64bit DC's to load the directory into
ram.

Note however that 64bit DC's are not a requirement, you can keep your
current 32bit DC's if they are sufficient.

Oliver

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Oliver Moazzezi [MVP] - 20 Feb 2008 18:02 GMT

Of course 'ration' is actually 'ratio' ;-)

Oliver

> You increase your Directory to Exchange processor ration from 4:1 to 8:1,
> as long as there is enough ram in the 64bit DC's to load the directory
> into ram.
>
> Note however that 64bit DC's are not a requirement, you can keep your
> current 32bit DC's if they are sufficient.

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Andrew Sword [MVP] - 16 Mar 2008 08:54 GMT

If there is not a problem why bother?

> All
>
[quoted text clipped - 8 lines]
>
> Thanks Again

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