yeah, there would be some general disagreement from me. Why? Only
because this is SBS box vs. an enterprise Exchange server hosting 5K
users.
My laptop (crud that it is) could host 20 heavy exchange users with
usable/good performance with that amount of memory. I don't think the
focus of a machine that will only ever have <75 users should be
optimized for more than space in most situations. It would be a waste
of money that could be spent on other things like better backups,
better coffee, etc.
I don't believe there's any value in buying a system such as SBS and
then having to make adjustments to things like pagefile size. That's
counter to the product's reason for being.
Saying that, Dave is correct that optimizing the disk layout has the
biggest benefit, but it's SBS and as such it's "special". Just ask
SBS-Lady ;)
Al
On 5/4/06, Dave Wade <[EMAIL PROTECTED]> wrote:
If you have 4gig of RAM then you should get minimal paging. (I know this is a
great generalization)
1) Log file access is sequential, database is random
2) Keeping Log files write queue down is key to performance
3) log files are write only
4) raid-5 tends to have poor write performance (again greate generalization).
So I would try and get another drive in the box so I could have a mirrored pair for
OS & LOGS, and a mirrored pair for Databases. . Putting these on seperate
drives will do far more for performance than changing the page file. RAID-5 is a
real bad performer on write. These days I woudl avoid as far as possible...
I am sure other folks may disagree...
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of Dan DeStefano
Sent: Thu 04/05/2006 21:36
To: [email protected]
Cc:
Subject: RE: [ActiveDir] Optimize Exchange Pagefile
Yes, far less than 100, on this box it is under 20.
You do not think it is necessary to mess with the page file, even if
only to make it static?
Dan
_____
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dave Wade
Sent: Thursday, May 04, 2006 4:06 PM
To: [email protected]
Subject: RE: [ActiveDir] Optimize Exchange Pagefile
There is no point in messing about with memory config if you only have a
three drive RAID 5 array. Disk config is critical. How many users do you want
to put on this box. less than 100?
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of Dan DeStefano
Sent: Thu 04/05/2006 20:16
To: [email protected]
Cc:
Subject: [ActiveDir] Optimize Exchange Pagefile
I was wondering if anyone can point me to any MS document that
discusses optimizing the page file on an Exchange box. I found
http://support.microsoft.com/kb/815372, but this article does not discuss the
page file. I am running SBS 2003 on a 3 GHZ Xeon with 4GB physical memory and a
3-disk RAID5 array with 2 logical drives. I plan on installing the Exchange
binaries on the first logical drive (which will also contain the system and
boot partitions) and the Exchange databases, logs, queues, etc on the second
logical drive.
The way I normally set the pagefile on my systems is to set it
to be static and 1.5x physical RAM. I also create a pagefile on each disk and
let Windows choose the best one (which will be the second logical drive). I do
not want to disable the pagefile on C: because, from what I understand, this
will disable crash dumps, which I do not want. However, I set the crash dump to
kernel only, not the entire pagefile. That being said, would it be appropriate
to set the pagefile on C: to something small like 256MB since the OS will be
using the one on the second drive anyway?
Also, other than not using the /3GB switch, are there any other
differences between the memory/pagefile settings on a regular Exchange box
running WS2k3 and the SBS2k3 version?
I would appreciate any guidance.
Dan DeStefano
Info-lution Corporation
www.info-lution.com
MCSE - 2073750
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