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Exchange 2007 high memory usage - 8.May2007 2:13:59 PM

bhfoto

Posts: 34
Joined: 23.Apr.2007
Status: offline

Hello,

I have 4 Exchange servers installed, 2 CCR mailbox servers each with 12GB ram and 2 HT/CA servers each also with 12GB ram. I am having an issue on the active CCR node. I have approx 200 mailboxes so far and the memory usage seems to be excessive. It is currently running at 11GB memory usage. Initially I had 4GB ram on each server and i thought perhaps if i upgrade the memory, the utilization would not be so high. Any idea why this is so?

Thanks,

BHFOTO

Post #: 1

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RE: Exchange 2007 high memory usage - 8.May2007 2:21:07 PM

Henrik Walther

Posts: 6827
Joined: 21.Nov.2002
From: Copenhagen, Denmark
Status: offline

The behavior you see on the active node in your CCR cluster is completely normal. This is in order to allocate as much data in memory address space as possible, so that each user experience great performance in their Outlook clients.

Why have 12GB of memory if it isn't used?

BTW if another process should need the more memory, the Exchange store.exe process will released it as required. This is by design.

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Henrik Walther
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MCITP: Exchange 2007, MCITP: Windows Server 2008, MCSE: M+S

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(in reply to bhfoto)

Post #: 2

RE: Exchange 2007 high memory usage - 8.May2007 2:33:57 PM

bhfoto

Posts: 34
Joined: 23.Apr.2007
Status: offline

So you're saying that if I was to bump it up to 16 or even 32GB RAM the utilization would still be 95%? So how can i tell exactly how much utilization is actually on the box? I will eventually have over 1800 users on these servers... My utilization on the HT/CA servers was also very high but now its much better.

(in reply to Henrik Walther)

Post #: 3

RE: Exchange 2007 high memory usage - 9.May2007 2:00:19 AM

Henrik Walther

Posts: 6827
Joined: 21.Nov.2002
From: Copenhagen, Denmark
Status: offline

Yes that's what I'm saying although I haven't deployed any CCR cluster nodes with mode than 12GB yet.

At least the store.exe process will use any unallocated memory it deem necessary.

_____________________________

HTH
Henrik Walther
Exchange MVP & MCM: Exchange 2007
MCITP: Exchange 2007, MCITP: Windows Server 2008, MCSE: M+S

Order my Exchange Server 2007 Book!

(in reply to bhfoto)

Post #: 4

RE: Exchange 2007 high memory usage - 18.May2007 7:10:16 PM

SKG

Posts: 10
Joined: 21.Mar.2007
Status: offline

What processor / processors you are using?
What is the motherboard, and what hard disk structure do you have.

I might be able to make a few suggestions!

I am guessing that you probably need to re-address the balance of your system designs.
Often you can improve performance by changing other things. Adding RAM tends to be expensive - and Exchange servers gobble most of it up. Basically no matter what you put in, it will use, so don�t go nuts with the RAM.

Before I even know what processor you have, I can tell you that performance will probably improve by upgrading to a CPU with higher cache in particular, speed generally - and obviously if you can add a second CPU! Almost goes without saying, but sounds like you need to be reminded - before you break the bank on RAM. Bear in mind that CPU prices fall and RAM does too, so no need to buy just yet � especially more RAM for 120 users. Wait until that quadruples!

For desktops RAM tends to be more important as they don�t have much, but for servers, its the CPU, as they are designed to use more RAM for SERVING. After about 8GB quite often you need to really think where your putting your money.

You might also want to move your accounts to a really fast raid array, or perhaps add another system (for the same price or less than the cost of all that RAM)!

Network location of the servers is also important to get the most out of them. They need to be relatively well juxtaposed to the clients. Quite often you can simply add another network card, make sure the server is set up to use both, and that takes care of the bottle neck you would never have thought about. Also look at your switches! Make sure you don�t have not so fast, �fast Ethernet switches�. If you do, replace them with gigabit or better.

The actual network card(S) themselves are also important. One with plenty of ability, tends to reduce the stress on the CPU, the RAM, the hard drives and the network!
Just remember throwing money at a problem wont make it go away. Design a solution.
Good luck.

(in reply to Henrik Walther)

Post #: 5

RE: Exchange 2007 high memory usage - 24.Oct.2007 11:18:11 AM

etolbert

Posts: 1
Joined: 24.Oct.2007
Status: offline

I have the same High memory issue only it is shutting down my Transport services. Any thoughts?

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RE: Exchange 2007 high memory usage - 20.Nov.2007 5:47:38 AM

rishishah

Posts: 576
Joined: 14.Nov.2006
From: Surrey, UK
Status: offline

etolbert,

Its called Back Pressure that is shutting down your Transport Services... have a look at http://www.exchangeinbox.com/articles/052/backpressure.htm

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If an advice works, report this to the fourm so that others are more confident about it.

Want a quicker answer - than describe your issue in as much detail as possible and exactly what steps you have already taken.

(in reply to etolbert)

Post #: 7