Solved

Has anyone seen this Unusual NLB and vmware problem

Posted on 2010-11-25
6
1,110 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
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
Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

 
LVL 28

Accepted Solution

by:
bgoering earned 500 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

Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

Question has a verified solution.

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

In this article, I will show you HOW TO: Suppress Configuration Issues and Warnings Alert displayed in Summary status for ESXi 6.5 after enabling SSH or ESXi Shell.
When you try to share a printer , you may receive one of the following error messages. Error message when you use the Add Printer Wizard to share a printer: Windows could not share your printer. Operation could not be completed (Error 0x000006…
Teach the user how to configure vSphere clusters to support the VMware FT feature Open vSphere Web Client: Verify vSphere HA is enabled: Verify netowrking for vMotion and FT Logging is in place or create it: Turn On FT for a virtual machine: Verify …
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

816 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

Need Help in Real-Time?

Connect with top rated Experts

9 Experts available now in Live!

Get 1:1 Help Now