Load Balancing on VMS

We are trying to create replicates on a VMS Alpha. The application is
being developed on a NT server, but then being distributed to a Forte
environment where a VMS Alpha box is the central repository.
The problem occurs when I try to load the application to the Alpha.
Does anyone have any ideas?
Here is a copy of the error message:
SYSTEM ERROR: System arithmetic exception caught: Unknown error 1284;
(floating point divide-by-zero).
Class: qqsp_ArithmeticException
Error #: [101, 347]
Detected at: qqos_MainSigHdl at 5
Last TOOL statement: method EnvironmentVM.LoadApplication
Error Time: Wed May 19 12:38:25
Distributed method called: qqsm_NodeAgentProxy.ExecuteCommand!53
(object
name
/forte/a626a860-eb48-11d2-a581-301b1969aa77/node/mwf609/systemmonitor/nodemgr)
from partition "EnvManager_cl0_Client", (partitionId =
A626A860-EB48-11D2-A581-301B1969AA77:0x30b:0x2, taskId =
[A626A860-EB48-11D2-A581-301B1969AA77:0x30b.21]) in application
"FTLaunch_cl0", pid 252 on node ROAPC123 in environment CENTRALENV
Exception occurred (remotely) on partition "Node Manager",
(partitionId =
A626A860-EB48-11D2-A581-301B1969AA77:0x25d, taskId =
[A626A860-EB48-11D2-A581-301B1969AA77:0x30b:0x2.13]) in
application
"System Manager", pid 20854333 on node MWF609 in environment
CENTRALENV.
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Check the virtual network adapter properties - you must enable MAC address spoofing. We had the same issues.
Note that this will absolutely pollute your host machine's system log with tons of spam and make it pretty much worthless. I'm trying to find a way around this as we speak, actually.

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Geting IP address for Internal Load Balancer

I've recently been experimenting with internal load balancing for VMs. I'm able to create and delete an internal load balancer (ILB) using the .NET wrapper for the API (https://github.com/Azure/azure-sdk-for-net). What I cannot do though is actually
get the internal address for it. Nor does it seem you can get it from the REST API (which, as far as I know, is what .NET wrapper wraps). The only method I can see that claims to get the address is Powershell.
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I have not looked into the .NET wrapper that you mentioned here, but according to this powershell script:
http://msdn.microsoft.com/en-us/library/azure/dn690125.aspx
$svc="<Cloud Service Name>"
$ilb="<Name of your ILB instance>"
$subnet="<Name of the subnet within your virtual network-optional>"
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Frank

Does Traffic Manager provide database load balancing for MySQL?

I need two VMs to implement MySQL Cluster in Windows Azure. VMs allow configure endpoint load balance set for Mysql, but I did not find tcp protocol in Traffic Manager. Does it provide this service for database
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Hi,
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How to control a Load Balanced set in IaaS VMs using Text files

Hi,
I would like to control the Load Balanced nodes Using a resource to probe like active.txt in IIS than a Endpoint on the Management Portal.
The reason i need this is because the engineers in my team will have access to VMs but not to Management servers.
Any info on it is very helpful.
Thanks

Hi,
You can Control the access to the Load Balanced Set by using Network ACL. A Network Access Control List (ACL) is a security enhancement available for your Azure deployment. An ACL provides the ability to selectively permit or deny traffic for a virtual machine
endpoint. This packet filtering capability provides an additional layer of security.
Using Network ACLs, you can do the following:
Selectively permit or deny incoming traffic based on remote subnet IPv4 address range to a virtual machine input endpoint.
Blacklist IP addresses
Create multiple rules per virtual machine endpoint
Specify up to 50 ACL rules per virtual machine endpoint
Use rule ordering to ensure the correct set of rules are applied on a given virtual machine endpoint (lowest to highest)
Specify an ACL for a specific remote subnet IPv4 address.
Network ACLs can be specified on a Load balanced set (LB Set) endpoint. If an ACL is specified for a LB Set, the Network ACL is applied to all Virtual Machines in that LB Set. For example, if a LB Set is created with “Port 80” and the LB Set contains 3 VMs,
the Network ACL created on endpoint “Port 80” of one VM will automatically apply to the other VMs.
Hope this helps !
Regards,
Sowmya

Azure Load Balancer - Query for VMs in rotation or removed from rotationq

From what I can tell, there is no way to know if any of the VMs configured as part of a Load-Balanced Set has been taken out of rotation. I see a PS script to set the Azure Load Balancer Endpoint -
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Hi,
From my experience, this issue was more related with Windows Azure network, I suggest you move to that forum for a better help.
The forum link was:
http://social.msdn.microsoft.com/Forums/en-US/home?forum=WAVirtualMachinesVirtualNetwork
Best Regards
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Hyper-V 2012 R2 & NLB (Network Load Balancing) with Unicast on VMs

Hi,
We set up a 2012 R2 Hyper-V Cluster. On this Cluster we would like to run 2 VM's which are using NLB (Network load Balancing) in Unicast mode.
We have created a External Virtual Switch wich is connected trough a 3x10GB LACP Team to a Cisco Nexux Switch.
We have tried to set the NLB up in the way we did with 2008 R2 but we were not be able to get this working. Is there any Change in 2012 R2 we did not think about?
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Timo

Check the virtual network adapter properties - you must enable MAC address spoofing. We had the same issues.
Note that this will absolutely pollute your host machine's system log with tons of spam and make it pretty much worthless. I'm trying to find a way around this as we speak, actually.

Load balancing VMs

We are due for a server refresh of our ESXi hosts and I am planning on switching from our existinginverted pyramid of doomto 2 hosts with local storage and some replicating. My question is how much do I need to worry about load balancing the servers on each host.We have 14 servers spread across 2 hosts with shared storage. IOPS results from a week of DPack running show 850 IOPS at 95%, 1622 IOPS at 99% and a peak of 3500 IOPS. 7 of our servers are 90/10 read/write, 5 are 20/80 read/write and the last 2 are about 50/50 read/write.The plan for the new hosts is for 10k SAS in RAID 10, but sizing is still up for debate depending on the number of drives needed to meet IOPS requirements. My thought was to have each host capable of about 600 IOPS, which I could pull with 8 drives according to the RAID performance calculator I used. I picked...
This topic first appeared in the Spiceworks Community

We are due for a server refresh of our ESXi hosts and I am planning on switching from our existinginverted pyramid of doomto 2 hosts with local storage and some replicating. My question is how much do I need to worry about load balancing the servers on each host.We have 14 servers spread across 2 hosts with shared storage. IOPS results from a week of DPack running show 850 IOPS at 95%, 1622 IOPS at 99% and a peak of 3500 IOPS. 7 of our servers are 90/10 read/write, 5 are 20/80 read/write and the last 2 are about 50/50 read/write.The plan for the new hosts is for 10k SAS in RAID 10, but sizing is still up for debate depending on the number of drives needed to meet IOPS requirements. My thought was to have each host capable of about 600 IOPS, which I could pull with 8 drives according to the RAID performance calculator I used. I picked...
This topic first appeared in the Spiceworks Community

Load balancing on older hardware for small business

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I'm not sure if this help you, but it's not that easy to join two networks together. If you take the reason why, it's because of different IP addresses. If you are downloading something from the Internet you would have to divide the data into two different IP addresses = two different computers. Thing you can do is auto-balance use of wlan0 and wlan1 according to the usage. So, script will forward for first user packets on wlan0 and if somebody else connects he will get forwarded to wlan1. If there are more people you need to divide network bandwidth in different way, but I don't see way how to get 20Mbps with a single computer on a single TCP connection working as normal. It's possible to ask server for portion of data with wlan0 and then for the second portion on wlan1, but it may be complicated for data downloads with server sessions attached to the IP.
Last edited by frefyx (2009-11-25 20:45:44)

Failover clustering Hyper-V + load balancing

I have successfully setup a number of Hyper-V (5) on Server 2008 R2 fail-over cluster environment with two nodes connected to a SAN using MS iSCSI Target 3.3 with cluster shared volume and all is working well.
Now each Hyper-v is run by node-A or node-B. is there a way to have both nodes process all Hyper-Vs at once?
Mike

Yes you are right I was not using the proper term. I have Hyper-V installed on both nodes and added the Hyper-V service in the Fail-over Clustering service. I can run the VMs on either nodes and distribute the 5 VMs but instead of selecting which node to
run each VM I would like to run all 5 VMs in one environment where both servers (nodes) can manage the processes of all 5 VMs. In other words each server have 64GB RAM and 16 core CPUs, I would like to have my 5 VMs processed by 128GBRAM and 32 core CPU. My
understanding is I am looking at Load balancing, I have seen how to do this with a web application but couldn't find anything on Load Balancing VMs.
You need to configure CSV on top of shared LUN, put your VM images there and run VMs on every host having access to LUN / CSV. See:
http://technet.microsoft.com/en-us/library/dd630633(v=ws.10).aspx
http://technet.microsoft.com/en-us/library/gg610692.aspx
Load balancing is another thing, you can use Live Migration to move VMs from one host to another (no downtime). See:
http://blogs.technet.com/b/iftekhar/archive/2010/01/18/microsoft-virtualization-hyper-v-live-migration-network-configuration.aspx
You can configure HA so one VM would re-boot on another node if primary host is down (minimal downtime). See:
http://blogs.technet.com/b/canitpro/archive/2011/04/18/creating-ha-vms-for-hyper-v-with-failover-clustering-using-free-microsoft-iscsi-target-3-3.aspx
You can configure guest VM cluster so VM would transparently failover to another host if primary one is down (no downtime). See:
http://blogs.technet.com/b/mghazai/archive/2009/12/12/hyper-v-guest-clustering-step-by-step-guide.aspx
http://blogs.technet.com/b/keithmayer/archive/2013/03/21/virtual-machine-guest-clustering-with-windows-server-2012-become-a-virtualization-expert-in-20-days-part-14-of-20.aspx#.Uss8YvRdWSo
Hope this helped :)
StarWind VSAN [Virtual SAN] clusters Hyper-V without SAS, Fibre Channel, SMB 3.0 or iSCSI, uses Ethernet to mirror internally mounted SATA disks between hosts.

JSF and load balancing issues

Hello,
We are having a difficult time getting our app to work correctly on our load balanced system. Any help / suggestions would be greatly appreciated.
We have a very basic load balancer which is in round robin mode (this cannot be changed), two separate vms, each with an instance of apache(2.0.54) and tomcat(6.0.14). Each apache talks only to the tomcat on the same vm and the tomcats are configured to session replicate with each other (which is happening).
When I log in to the app and start pressing a few buttons there are no problems for a little while. I then leave the screen idle for 1 minute and resume pressing buttons. The main session bean which holds information about where the user is and other key information, gets its constructor called and is set back to default and the page goes back to the main menu. Immediately before the bean is reset, the logs show the following:
[MyApp] 17 Jun 2009 15:33:27,514 WARN: [ajp-8009-2 LoggerListener.onApplicationEvent(60)] : Authentication event AuthenticationSuccessEvent: v; details: (etc etc removed…)This is what the two logs look like:
VM1 - Authentication event
VM2 - Main menu
VM2 - Presss a button – progress a screen
VM2 - Presss a button – progress a screen
VM2 - Presss a button – progress a screen
VM2 - Presss a button – progress a screen
[wait 1 min]
VM1 - Authentication event
VM1 - Bean reset
Processing continues, but screen is redirected to main menu
We have the distributable tag in the web.xml file and javax.faces.STATE_SAVING_METHOD is set to client. Its set to client as the app will not work at all with it set to server (keeps asking for the user to re-log in).
Thank you,
Victoria

Looks like a Tomcat issue to me. JSF is not going to timeout in 1 minute. You might want to check your Tomcat replication settings. Note try to do a very simple loadbalancing application that just echos the Tomcat is executing on.

Set up Network Load Balancing on an Azure VM

i have an VM on Azure, on which I have two AD LDS instances. I want to set up Network Load Balancing to have fault tolerance between the two AD LDS instances. when i start to create a new cluster, it shows me a message that DHCP will be turned off. i ignored
that one time, and what conspired was that i was unable to access the VM only. i had to set up my AD LDS instance on a different VM again.
is there any way which will enable me to set up the AD LDS instance properly on the VM?

Hi,
Firstly, if I understand correctly, you set up a cluster with only one VM? Based on my experience, you need to use two Azure VMs running AD LDS to configure Failover cluster.
In addition, did you mean that you cannot RDP into the VM after you created the cluster? If yes, which kind of error message you have received? Please check the Quick Glance of that VM on the
Azure management portal to make sure that all the parameters for that VM are displaying, especially for the internal IP address.
Furthermore, it seems that the question is related to Azure Virtual Machines, I recommend you to ask in Azure Virtual Machine forum below for further assistance:
https://social.msdn.microsoft.com/Forums/en-US/home?forum=WAVirtualMachinesforWindows
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Susie

VMware vCloud Load Balancing SSL / HTTP

Hi,
I'm having issues with enabling SSL Health check for my CAS VMs, works fine when I select TCP however doesn't work when I change health check to SSL. This relates to a previous issue I've raised (http://social.technet.microsoft.com/Forums/office/en-US/0b3e2573-99ed-49a0-9fbb-c46a629dcc50/exchange-2013-load-balancing-owaecp?forum=exchangesvravailabilityandisasterrecovery
TCP is great but would much prefer to do an SSL check instead;
Tests servers using SSLv3 client hello messages. The server is considered valid only when the response contains server hello messages.
This url helps,
http://blogs.vmware.com/vsphere/2012/11/load-balancing-using-vcloud-networking-and-security-5-1-edge.html
The only other issue is I have a redirect at root mail.domain.com => mail.domain.com/owa Could that be the issue because of the re-direct!
Thanks ;)

Hi,
Try to redirect to HTTPs. More details as below:
Simplify the Outlook Web App URL
http://technet.microsoft.com/en-us/library/aa998359(v=exchg.150).aspx
How to configure Exchange to redirect OWA HTTP requests to HTTPS requests in IIS 7
http://support.microsoft.com/kb/975341
Please correct me if there is any misunderstanding.
Also find some external resource for your reference:
Add a Pool Server to an Edge Gateway
http://pubs.vmware.com/vcd-51/index.jsp?topic=%2Fcom.vmware.vcloud.admin.doc_51%2FGUID-C12B3954-155F-48AF-9855-E0DE026752D0.html
Introduction to Gateway Services: Load Balancing
http://vcloud.vmware.com/using-vcloud-hybrid-service/tutorials/introduction-to-gateway-services-load-balancing
Disclaimer:
Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure
that you completely understand the risk before retrieving any suggestions from the above link.
Thanks
Mavis
Mavis Huang
TechNet Community Support

Nexus1000V load balancing

Hello,
could someone help me clarify this...
In our environment we have a Nexus1000V. VEMs are connected to two uplink switches. At this point neither mac-pinning nor vPC-HM are being used and nexus is running the default load-balancing mechanism (source-mac). I see a mac-flapping on the uplink switches for servers in the VCenter. If source-mac was being used shouldn't the mac-address of a vm be persistent on a specific switch, assuming that it is not moved to another ESXi?
We are planning to change our uplink port-profiles to either mac-pinning or vPC-HM. The documentation states that, in this case, the vms are associated to an uplink in a round-robin fashion. So what is the use of load balancing in this case? Does load-balancing have effect only if proper LACP is formed (stackable switches etc)?
A last question:
If mac-pinning is used and a link fails, then all vm traffic will be sent to the second link. If the first link comes up again, then will the traffic for the vms that were associated with the first link, be moved back to the first or will the traffic continue to flow on the second one?
Thank you in advance,
Katerina

Hi Katerina,
I configured my lab for "channel-group auto" and the two links are in a port-channel.
The VEM views the two uplinks as the same interface.
n1k# module vem 4 execute vemcmd show port
LTL VSM Port Admin Link State PC-LTL SGID Vem Port Type
19 Eth4/3 UP UP F/B* 1039 0 vmnic2
20 Eth4/4 UP UP F/B* 1039 0 vmnic3
49 Veth9 UP UP FWD 0 0 vmk1
* SGID denotes Sub Group ID
Based on the output, Vmk1 traffic can take vmnic2 or vmnic3. N1k sees this port-channel as one outgoing interface. In order to avoid mac flapping, we would need to configure the two upstream switchports into one logical interface.
Now, with MAC Pinning configured, we run the same command
n1k# module vem 4 execute vemcmd show port
LTL VSM Port Admin Link State PC-LTL SGID Vem Port Type
19 Eth4/3 UP UP F/B* 1040 2 vmnic2
20 Eth4/4 UP UP F/B* 1040 3 vmnic3
49 Veth9 UP UP FWD 0 2 vmk1
vmnic2 and vmnic3 are treated as two different outgoing interfaces. There is no upstream switchport configuration required.
HTH,
Joe

Azure: "Cloud Services" for VM - Load Balancing, yes, and other things?

I'm trying to get a handle on the significance of the cloud service
(that is created when a new VM is created). I understand that a group of
VMs need to belong to the same cloud service in order to participate in
Load Balancing. I can't see any other reason to group VMs into a single
Cloud Service. On the other hand it seems like overkill to create a
cloud service for each VM.
Are there any advantages/reasons to adding a group of VMs to Cloud Service other than Load Balancing?

Hi,
If you made a group VMs as a cloud service, you can configure them and manage them by yourself, you could select Linux or Windows Server VMs and either compose the VM images in the cloud or upload a VHD you’re previously
created using Hyper-V, You can capture a VM and add it your image gallery for easy reuse. you also could run a product like Active Directory or SQL Server or SharePoint Server successfully, etc...
I suggest you have a look at following article. (create VM as cloud service belong to IaaS)
#http://davidpallmann.blogspot.in/2012/07/windows-azure-is-3-lane-highway-how-to.html
Best Regards
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Error while selecting Load Balancing in JCO creation

While creating JCO i am facing this error.It is working fine with Single server connection,but when i chose Load balancing i error comes out.Please tell me the solution.
I have read couples of forum mentioned you need to start both Portal and ECC.
For you information my Portal and Java are both on diffrrent Box.
com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to message server host failed Connect_PM TYPE=B MSHOST=olameccpdvr GROUP=PUBLIC R3NAME=DVR MSSERV=sapmsDVR PCS=1 LOCATION CPIC (TCP/IP) on local host with Unicode ERROR service 'sapmsDVR' unknown TIME Thu Feb 24 12:19:54 201 RELEASE 701 COMPONENT NI (network interface) VERSION 38 RC -3 MODULE nixxhsl.cpp LINE 776 DETAIL NiHsLGetServNo: service name cached as unknown COUNTER 5

Is your backend system configured correctly in your SLD ?
Go to transaction SMMS on your backend system that your are connecting to. Click on Goto=>Parameters=>Display. Look for "server port" value.
This should give you the TCP/IP port for your message server. It could be 3600 or 3601 (36NN - where NN is the instance number).
In your services file, if you made the entry at the end of the file, press Enter (Return) after your entry.
Try restarting your server after making the above changes.
- Shanti

Load Balancing on VMS

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