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Slow Network Performance

By bari ·
Hi all,

Have a slow network problem and would really appreciate your input.

Background info:
Master Domain/ Resource Domain
Resource Domain has one subnet with one BDC, which is also, a File Server (Running NT 4.0), using 100baseT Ethernet cabling. BDC (Compaq Proliant 6500: 256mb ram, dual 450Mhz CPU, 40G hdd, available 2G)
The number of users (175) and data on the File Server has not changed much.
This setup has been working fine for the last one year, this problem came up about two weeks ago (and there was no changes made to the network).


Ran Performance Monitor and the only thing that looked interesting was the Object " Network Interface " with Counter "Current Bandwidth" which is 100% utilized. Here's the interesting point, even when the bandwidth is 100% sometime the users network performance is normal (access time to retrieve data from the server) and other times it's slow. About half of the users are accessing the Access Database (size: 800mb) from the server.Even FTP files are t

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Slow Network Performance

by Inspectorclave In reply to Slow Network Performance

Need a bit more info on the environment, but it looks like you are getting a bunch of broadcast traffic. If so, then there are several things that you can do to optimize the network. First, remove any non-needed protocols. Next, make sure that you are running WINS and have the client computers properly configured with the IP address of the WINS server. If you have any servers across a WAN link that require replication, make sure that replication is set to occur after hours. You may want toimplement a switch (like a 3Com SuperStack II Switch 3000). You can hook all of your tier 1 hubs up to the switch. Traffic will then be directed to the appropriate hub as opposed to all traffic going to all hubs.

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Slow Network Performance

by bari In reply to Slow Network Performance

The question was auto-closed by TechRepublic

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Slow Network Performance

by McKayTech In reply to Slow Network Performance

The tool of choice for tracking down these kind of problems is a packet trace so you can identify the origin of the traffic (something like Network Sniffer, Network Monitor, Net X-ray). Without this information, all you can do is isolate suspect pieces of equipment one by one by removing them from the network.

It could be broadcast traffic, but it could also be a jabbering NIC or a failing cable that causes a lot of re-sends from a particular station. In a non-switched environment, it onlytakes one malfunctioning cable or device to load up the network and finding it without a packet trace is the old needle in the haystack approach.

regards!

paul

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Slow Network Performance

by bari In reply to Slow Network Performance

The question was auto-closed by TechRepublic

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Slow Network Performance

by DC1 In reply to Slow Network Performance

That counter generally just tells you your bandwidth..10 mbps or 100 mpbs. Since yours is 100 that would make since since it is 100 mbps. If you feel it is server performance look more at disk, memory, processor, etc. Of it is bandwidth traffic than you will need to get a sniffer or other packet analyzer. If its database, upgrade to SQL.

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Slow Network Performance

by bari In reply to Slow Network Performance

The question was auto-closed by TechRepublic

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Slow Network Performance

by tysonmathews In reply to Slow Network Performance

Map the commonly used drives to users machine as a drive letter and you will find that access is much faster and greatly improved. accessing them vie \\\192.168.254.1\ourshares\databases will be slow and cumbersome. Try mapping them and see a difference.

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Slow Network Performance

by bari In reply to Slow Network Performance

The question was auto-closed by TechRepublic

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Slow Network Performance

by rwscc In reply to Slow Network Performance

Your 40g hd with only 2g free sounds suspicious to me. With a 0.8g access database I think you may be running into highly fragmented temp files and pagefile.sys. Add the extra fields in the process view of task-manager. I'll bet page faults on several system processes are quite
high when users detect a slowdown. Try adding a cheap-fast 9g drive and move all but 256m of pagefile to the new drive (I'd make it at least 2g on the new drive). A BDC is a hog for virtual memory. Then maybe
moved seldom used data to the new drive as well.

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Slow Network Performance

by bari In reply to Slow Network Performance

The question was auto-closed by TechRepublic

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