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Concurrent connections supported

Posted on 2013-06-17
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Last Modified: 2013-07-09
Hi,
We have a Terminal Server that is a Windows 2003 R2 server with 4GB ram, Intel Xeon 2Ghz. It hosts the point of sale application for remote locations to access & its also the company file server locally. How many remote concurrent connections can this server support before it runs out of resources & slows down to a crawl?
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Question by:yohayon
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Expert Comment

by:BurundiLapp
ID: 39254617
You will need to have two users log into the server and observe the memory and cpu requirements for those two users actively using the POS sale application and then extrapolate from there.

What is the disk subsystem the server is using, a multi disk RAID 10 or RAID 5 system with maybe 5 or 6  disks (not including parity or hotspares) should be sufficient but it largely depends on the number of users actively using it as a file server as well.

Are we looking at tens or hundreds of users, is the server connected via gigabit ethernet, lots of large files or many small ones, mainly reads or writes or a even mixture?

To be perfectly honest the hardware you've given us so far sounds underpowered for what you are intending, any upgrade options available?
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by:yohayon
ID: 39274909
Thank you. Can you comment on possible requirements after you view the attached pic showing connected users & Task Manager?
term server
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Expert Comment

by:BurundiLapp
ID: 39275100
Looking at the memory usage I'd suggest 18 to 20 users maximum, I've no idea from that screenshot how your disk system is coping, you can monitor the disks queues in Performance Monitoring to see how they are, the queues should be very low on a system that that is keeping up with the reads and writes but to be honest you could probably tell from the performance of your apps in the sessions whether you are having problems or not.

I would however suggest putting more RAM in the server, the more the better.

How many users do you want to get connected to the server?
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Author Comment

by:yohayon
ID: 39275202
I want to connect another 35 users. See pic of perf counter
perf counter
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BurundiLapp earned 2000 total points
ID: 39275252
Your average disk queue length looks like it is already taking a hammering, I would advise that 35 is too many users for that server as it is configured, even taking it to 18 may be too many although I can only speculate without seeing the results over an extended period.

I would highly recommend a dedicated server for this task with more RAM, putting too many users onto that server will cause issues with all it's roles.

Looking at the RAM you have 1gb for the system and 1.5gb in use by applications giving another 1.5gb for more applications so this is effectively doubling the amount of users you had on so from 9 to 18, there is simply no way that server can support 35.  You are using an estimated 166mb per user, if you want to get 35 users on a server you will need approx 6gb just for the users and another 1gb for the system so 8gb would probably just cope but I would spec to 12gb as a minimum.

Bear in mind also that as the physical RAM runs out the server will page to disk more causing further stress on the disk system.  If you can upgrade the disk system then this server may suffice however I would go with a server dedicated to the task.
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