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Server Network LAG

Posted on 2012-03-21
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Last Modified: 2012-06-21
I am in the process of creating LAG's for servers on our network. For testing purposes I am currently only using two servers before I continue further.

Shown below is how I have it setup, and everything seems to be fine, but I can't seem to utilize the connections. It shows that we now have 2 Gbps link speed on each server so the switch is working.
I have sent several 3 Gig files between the servers (about 30 seconds between each), and they seem to top out at about 50% Network in the Task manager. Same thing happens when sending a single 1 Gig file.
If I send two files at the same time in different directions, then it will slightly raise above %50.

My main question is, is there a better way to set this up?
Am I just not testing it the correct way and is there a better way to see my utilization outside of the task manager?
Thank you for the help.

Server One
- Server 2008 x64
- Two Intel PRO/1000 MT Network Cards
       - Network Adapter Driver is installed
       - Static Link Aggregation
Server Two
- Server 2008 x64 R2
- Two Broadcom NetXtreme II Network Cards
       - Broadcom Advanced Control Suite 4
       - FEC/GEC Generic Trunking (Static LAG)
Switch
- Power Connect 2824
       - LAG components are set
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Question by:bookbyte
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Expert Comment

by:Khandakar Ashfaqur Rahman
ID: 37751301
Do you want to check throughput ?
You may use Iperf to check capacity or throughput using different protocols:
http://mayoxide.com/iperf/
http://openmaniak.com/iperf.php

You also can use Bitmeter to Netpersec to check utilization of your server.
http://www.softpedia.com/get/Network-Tools/Bandwidth-Tools/Bitmeter-2.shtml
If you want to see usage graph then you need to enable SNMP into your switch and have to install MRTG or Cacti into a pc.
http://www.cacti.net
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Author Comment

by:bookbyte
ID: 37757937
I couldn't get iperf to install on Windows server 2008.
The other issue we seem to be having is that sporadically we can't get to the internet.
The connection shows being fine and we can ping say Google but IE won't  connect.
I run diagnose connection issues and it says that there are not problems.
More importantly I need to install a program to test the throughput and capacity for Server 2008 x64
Thanks
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LVL 11

Expert Comment

by:Khandakar Ashfaqur Rahman
ID: 37757980
Try with another browser(if you have) like Mozilla,Google Chrome or Opera.Check if it is browser issue or not.If you can't browse it might be for 2 reasons:

1. Browser issue: Change your browser.
2. Bandwidth problem: Do you see high latency and packet loss when you ping ?
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Author Comment

by:bookbyte
ID: 37767427
Well it's not the browser.
There were not packets lost while it was working, but occasionally it will show full connection to the domain and the internet but you can't go to Google or ping outside.
Nothing changes it just seems to decide not to work sometimes.
I have taken it out of LAG for now but will retry sometime later this week.
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Accepted Solution

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Khandakar Ashfaqur Rahman earned 500 total points
ID: 37768267
When you have problem to connect to internet try the following:

1. Check IP settings. You can use "ipconfig /all" command on command prompt or You can check manually from TCP/IP properties.
2. Clear ARP cache by "arp -d" command
3. Ping gateway IP
4. Ping outside IP like 202.84.64.37 or any other
5. ping domain name like google.com or any other.

By these steps you can easily find out the problem.
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