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SBS 2008 slow, all memory being used

Small Business Server 2008 is running slow.  Users have difficulty accessing network resources.  Logging on takes a long time for profile to load.  Using task manager, in performance tab I can see that all 8 GB of memory are being used, but Physical memory usage monitor shows zero activity.
The process tab shows around 10 processes, all of which use less than 1gb of memory total.
Is there a way to find out what is using all the memory?
3 Solutions
Cliff GaliherCommented:
8 gigs of memory is really the bare minimum for an SBS 2008 "test lab" environment. If you are running *any* applications, even A/V, you want 12, and I think 16 is a real world "sweet spot."

In short, you should be able to view what is using the memory via task manager, but as you observed, they are only going to be taking a gig or two, so you can't really limit anything any more than that to improve performance. Another process will just step up to take whatever you free up, because they are *all* too resource starved.

Upgrade your RAM.

How many users. cgaliher is correct more memory better...
That being said I have a customer with a SBS virtual machine running 5GB of RAM with no issues at all. They are running TrendMiro AV Worry Free Advance so teh Exchange Store is being scanned also.  It is a little slow when I remote into it but not too bad. They are a very small office though at the most 5 active Users.

The difficulty accessing network resources maybe a networking issue.

My advice is do not mess with anything like SQL and try to limit memory usage it will come back to bite you. I learned from experiences. I limited SQL memory and it help for a few months then I had SQL revenge. :-) Instead of taking memory now it was gobbling CPU and I/O.  
In a server the biggest users of memory are not normally processes but some form of caching. A screenshot of Task Manager - Performance tab would be useful. Otherwise this is all just speculation.
AE_JBAuthor Commented:
There are usually about 25-35 users online during the day.  No database or 3rd party programs running on the server except antivirus.  Exchange has very light use.
Restarting the server fixed the performance issue.  Probably was an update that was being applied and required a restart.
Memory recommendations helped.  I'll keep these in mind for future upgrades and current use.
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