Exchange 2007 Sizing

David Gilmore · Joined: 05 Aug 2007 Posts: 2

I have several questions related to the Design and Deployment that I am
hoping someone can help with.

First questions is in relation to the amount of memory you can specify per
user for caching. MS recommends between 2MB and 5MB, but can you assign
more, say 10MB per user if you have enough memory? Is this a global setting
ot can you break it up based on the store or the user?

Second question, how does multiple systems accessing a single mailbox affect
performance, for example, a Desktop, laptop and Mobile device all accessing
one mailbox. For example an executive with a laptop and mobile device, and
an administrative assistant with a desktop checking the executive Inbox,
Contacts, and Calendar.

Thank you

--
David Gilmore
Vice President
Stenhouse Consulting

Microsoft Certified Partner

Archived from group: microsoft>public>exchange>design

"Jetze Mellema \ · Joined: 05 Aug 2007 Posts: 7

"David Gilmore" wrote in message @microsoft.com...
>I have several questions related to the Design and Deployment that I am
> hoping someone can help with.
>
> First questions is in relation to the amount of memory you can specify per
> user for caching. MS recommends between 2MB and 5MB, but can you assign
> more, say 10MB per user if you have enough memory? Is this a global
> setting
> ot can you break it up based on the store or the user?

Hi David. This is not a setting per user, it is a guidline for you to choose
the right amuont of memory you have to put in the mailbox server. Let say
you have 300 light users.

2 GB needed for Windows, Exchange
300 x 2 MB = 600 MB
1 GB vor virus scanning

Total: 3.6 GB -> 4 GB needed.
--
Met vriendelijke groet,

Jetze Mellema (MS MVP)
Lees mijn blog: http://jetzemellema.blogspot.com/
Mijn hobby: http://www.mellema.net/homecomputers
How to ask a question: http://support.microsoft.com/?id=555375

Mark Arnold [MVP] · Joined: 05 Aug 2007 Posts: 1126

On Wed, 20 Feb 2008 11:38:03 -0800, David Gilmore
wrote:

>I have several questions related to the Design and Deployment that I am
>hoping someone can help with.
>
>First questions is in relation to the amount of memory you can specify per
>user for caching. MS recommends between 2MB and 5MB, but can you assign
>more, say 10MB per user if you have enough memory? Is this a global setting
>ot can you break it up based on the store or the user?
>
You don't specify it. You work out how many users you have per server
and add that amount of memory to the base per role server. If you want
to do the calcs at 10MB a user then fill yer boots.

>Second question, how does multiple systems accessing a single mailbox affect
>performance, for example, a Desktop, laptop and Mobile device all accessing
>one mailbox. For example an executive with a laptop and mobile device, and
>an administrative assistant with a desktop checking the executive Inbox,
>Contacts, and Calendar.

No. A mailbox doesn't actually exist in a definable chunk of data,
it's just an interpretation of a database. Multiple users accessing
data could result in some interesting behaviour with silly things, not
least the read/unread view but nothing that would ruin your day.

>
>Thank you

Oliver Moazzezi [MVP] · Joined: 02 Oct 2007 Posts: 583

Hi David,

I honestly wouldn't calculate ram at more than 5mb per heavy MAPI user.
Microsoft themselves saw no real benefit above 5mb per mailbox, as mentioned
in the 'Planning Memory Configuration' article on TechNet.

In regards to Activesync access, I wouldn't add any extra IO requirements
for this. The same for a secretary accessing a shared Calender of her boss
etc.

Note Exchange 2007 SP1 lowers the amount of baseline ram required for SG
support, again check TechNet for reference to this.

The Exchange 2007 Storage Calculator should help you with some of this
planning, not neccesarily your RAM requirements but once it has made a
recommendation to how many SG's you should have for your user base you can
then plan your memory guidelines a lot better.

Also if you are going to be having a lot of mail flow, ensure you size and
design your Hub Transport servers correctly also - they will need the
required IOPS and ram for trouble free SMTP mail flow.

Oliver

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