[2 days left] What’s wrong with your cloud strategy? Learn why multicloud solutions matter with Nimble Storage.Register Now

x
?
Solved

Has anyone seen this Unusual NLB and vmware problem

Posted on 2010-11-25
6
Medium Priority
?
1,149 Views
Last Modified: 2012-05-10
We have a 2008 NLB cluster of 2 machines we shall call A and B and a 2008 file server called C

They are all on VMware as virtual machines. The cluster servers are sharepoint servers and access data from fileserver C.

The problem we had was that cluster server B could not see fileserver C  and vice versa either to ping or tracert or to access shares via IP or host name.
 but could they could both see all other servers on the network,

After trying lots of things we tried performing a drain stop on server A from NLB manager. Suddenly Cluster server B could see the file server and vice versa. We brought back cluster server A and still everything worked fine.

Thing is that while it works for now we need to know why this happened before we can make these servers live in a production environment but are at a loss to explain.
0
Comment
Question by:allanburrows
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 
LVL 28

Expert Comment

by:bgoering
ID: 34212888
Is the fileserver on the same network segment as the nlb servers? Are you using nlb multicast?
0
 
LVL 28

Expert Comment

by:bgoering
ID: 34212963
Also take a look at the hotfix info from http://support.microsoft.com/kb/960916
0
 

Author Comment

by:allanburrows
ID: 34213075
The file server and cluster are on the same subnet and on the same esx host, they are using unicast.
We are thinking maybe using a virtual switch on vmware and using that to load balance maybe.
I am just looking at the hotfix right now, thanks.
0
NFR key for Veeam Agent for Linux

Veeam is happy to provide a free NFR license for one year.  It allows for the non‑production use and valid for five workstations and two servers. Veeam Agent for Linux is a simple backup tool for your Linux installations, both on‑premises and in the public cloud.

 
LVL 28

Accepted Solution

by:
bgoering earned 2000 total points
ID: 34213454
I strongly recommend using multicast - the only issue (and the reason why unicast is the default) is that for some network equipment (Cisco IOS routers in particular) you must go into the network configuration and add a static ARP entry for the multicast mac address. However, for cisco firewalls like ASA, FWSM, and PIX  no such static arp entry is required. I can't speak for other vendors - but the benefits of using multicast NLB makes it worth it for that one time administrative task to set it up.
0
 
LVL 10

Expert Comment

by:srgilani
ID: 34215614
use vSwitch for load balance instead routing traffic to physical switch.
0
 
LVL 8

Expert Comment

by:sandipkharde
ID: 34215743
I had same type of issue where sharepoint server i was able to access remote but withing sharepoint environment it was not connecting each other ....event ping was replying with alive connection.

after reporting to network and security team they add that particular server Mac address and Server IP address in switch.

This sharepoint environment was in VLAN...hope this will help.
0

Featured Post

Will your db performance match your db growth?

In Percona’s white paper “Performance at Scale: Keeping Your Database on Its Toes,” we take a high-level approach to what you need to think about when planning for database scalability.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This program is used to assist in finding and resolving common problems with wireless connections.
This article explains the fundamentals of industrial networking which ultimately is the backbone network which is providing communications for process devices like robots and other not so interesting stuff.
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…
Michael from AdRem Software outlines event notifications and Automatic Corrective Actions in network monitoring. Automatic Corrective Actions are scripts, which can automatically run upon discovery of a certain undesirable condition in your network.…

649 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question