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File Server Causing Constant Network Slowness

Posted on 2013-06-04
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Last Modified: 2013-06-11
Hi folks!

Okay, I'm stumped. :-)

For the past week or so, our network performance has been very slow. Specifically, applications continually "freeze" for a few seconds, and then suddenly kick back in and continue. We use roaming profiles in our environment, and based on my observations, it looks like everytime an app does something that accesses the roaming profile, things go weird.

So... I have no concrete evidence here, but I'm guessing the file server is the culprit. Problem is, I see no problems. It's a Windows Server 2008 R2 x64 machine with all appropriate updates and service packs. Nothing unusual is running on it. It basically serves no role other than being a file server. There's no errors in the Event Viewer to speak of.

Anyone have any suggestions on where to look? Or do you think I'm barking up the wrong tree with the profile/file server hypothesis for these issues?

Thanks,
Ithizar
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Question by:Ithizar
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Expert Comment

by:David Johnson, CD, MVP
ID: 39220803
Could be a bad NIC somewhere in the network.. lots of things it can be..
Check the server resources, memory, cpu utilization, disk queue length, etc,  if these are within normal levels.  Check the event logs for any disk errors on the server this will slow things down as the drive tries to recover. Anything else in the event logs that look suspicious?

Check with wireshark to see what the activity is on the network.
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Author Comment

by:Ithizar
ID: 39220810
As I was reading your reply, I just experienced the symptoms. My web browser (Firefox in this case) froze as I tried to scroll down. The whole screen "whited out" for a second, but then it came back. But it's not tied to Firefox. I see the same behavior in Outlook, in Word, in Internet Explorer, etc. And it's not just my PC. Users all over the network are reporting the exact same behavior.

Therefore, I would think it would have to be something that affects the whole network -- like at the server or network hardware level -- rather than something at the individual PC's. Would you agree? I'll check the areas you mentioned, but last time I looked, resource utilization -- at least on the file server -- was normal. I didn't check the domain controller.
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Accepted Solution

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Ithizar earned 0 total points
ID: 39227386
Well, I found the culprit. It was our Faronics Anti-Virus software. It was causing massive slowdowns on our file server. I'm currently working with their tech support to figure out why.

Thanks to everyone for the help!
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Author Closing Comment

by:Ithizar
ID: 39237158
Found the solution.
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