Patch applying on Two node application server(load balancing)

Hi,
We have Two aplication servers with load balancing with PCP.
I want to know about applying patches order.
First patch has to be applied on primary applicaton node.
and next it has to be applied on secodary application node.
Please confirm.
Regards,
maleem

maleem wrote:
Hi Mapps,
We do not have shared aplicaton Tier. I think in that case we have to apply patches on both applicaton nodes.
am i right? please correct me if i am wrong.
Regards,
maleem
Correct.
Thanks,
Hussein

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Oracle Applications 11i Load Balancing does not work with RAC one Node

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Could you help me to resolve this issue.
Architecture environment is :
- One APPS tier node
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- The primary node have instance_name SIGM_1 and the secondary node have instance_name SIGM_2, but in RAC one node, the secondary instance is not alive.
We convert our EBS 11i environment to RAC following note ID Using Oracle 11g Release 2 Real Application Clusters with Oracle E-Business Suite Release 11i [ID 823586.1].
When testing Database failover, Oracle Applications 11i load balancing does not work anymore.
The root cause is that, when the primary node of the Rac one node is down, the INSTANCE_NAME_1 is automaically relocating to the surviving node,.
During test failover, we imagine that when the primary node goes down, the secondary node start or relocate database with instance_name SIGM_2, and in that case the Oracle Applications load balancing works.
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This is something I observed a long time ago for Safari (ie: around version 1). I'm not sure this is Safari, per se, but OpenSSL that is responsible for the behavior. I'm pretty sure Chrome does this and I've seen some Linux browsers do it.
What I have done at the last two companies I've worked for is recommend that our clients do not use SSL SessionID as the way of tracking sticky sessions on web servers, but instead using IP address. This works in nearly all cases and has few downsides. The other solution is to use some sort of session sharing on your web servers to mitigate the issue (which also means that your web servers aren't a point of failure for your users' sessions). (One of the products I supported had no session information stored on the web servers, so we could safely round-robin requests, the other product could be implemented with a Session State Server... but in most cases we just used IP address to load balance with). The other solution is to configure your load balancer to terminate the SSL tunnel. You get some other benefits from this, such as allowing your load balancer to reduce the number of actual connections to the web servers. I've seen many devices setup this way.
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Server Load-balancing Across Two Data centers on Layer 3

Hi,
I have a customer who would like to load balance two Microsoft Exchange 2010 CAS Servers which are residing across two data centers.
Which is the best solution for this? Cisco ACE or Cisco ACE GSS or both?

I would go with source natting the clients ip addresses, so that return traffic from the servers is routed correctly.
It saves you the trouble with maintaining PBR as well.
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Cheers,
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Hi,
How can I create directory on a two-node Oracle server cluster (2 identical servers running the same Oracle database instances with shared disks)? Both of them run Windows 2008.
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CREATE OR REPLACE DIRECTORY g_vid_lib AS 'X:\video\library\g_rated';
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Using 11.2.0.? Using ASM? use ACFS - it is a SHARED file system.
http://docs.oracle.com/cd/E16338_01/server.112/e10500/asmfilesystem.htm
create [big empty disk group]
create ACFS volume {container file that lives in that diskgroup]
create ACFS file system
mount the file system.
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App-V 5 Publishing Server + Load Balancing (NetScaler) issue

All,
I have attempted to load balance my App-V 5.0 deployment, which includes two nodes (appv-1 and appv-2) on a Citrix NetScaler VPX appliance.
The management server is working fine, when browsing to the load balanced VIP DNS alias - pass-through authentication works great and the management console is displayed.
When I attempt to browse to the load balanced VIP DNS alias for the Publishing Server, it prompts for authentication credentials, then displays the following error:
Method not allowed. Please see the service help page for constructing valid requests to the service.
When I attempt to browse using the same internet explorer instance to http://appv-1.fqdn:8088 it displays the XML page after entering authentication credentials.
Here is my set-up & what I have done....
Appv-1 Server
Management Server installed on Port:8088
Publishing Server installed on Port:8090
SQL Cluster and Mirroring configured (tested and working)
Appv-2 Server
Management Server installed on Port:8088
Publishing Server installed on Port:8090
SQL Cluster and Mirroring configured (tested and working)
NetScaler
Management VIP: 10.1.1.148
Publishing VIP: 10.1.1.124
Both Appv-1 and Appv-2 are setup as services and bound to the corresponding Virtual Servers.
Load balance alogrith - persistence - source IP: 255.255.255.255 - Least Connection
DNS and AD Modifications
host A record - appvmgmtsrv.fqdn = 10.1.1.148
host A record - appvpubsrv.fqdn = 10.1.1.124
computer object create in same domain for appvmgmtsrv and appvpubsrv
SPN Modifications:
setspn –A http/appvmgmtsrv:8088 domain\appvmgmtsrv
setspn –A http/appvpubsrv:8089 domain\appvpubsrv
setspn –A http/appvmgmtsrv.domain.local:8088 domain\appvmgmtsrv
setspn –A http/appvpubsrv.domain.local:8090 domain\appvpubsrv
IIS Modifications:
Appv-1 and Appv-2 - ApplicationHost.config - modified with below line for both Management and Publishing Server sections:
<windowsAuthentication enabled="true" useKernelMode="true" useAppPoolCredentials="true" />
Rebooted and IIS starts correctly.
Testing
On Appv-1 if I browse to http://appvmgmtsrv.fqdn:8088/console.html it asks for authentication, when authentication is entered it fails.
On another other machine in the environment if I browse to http://appvmgmtsrv.fqdn:8088/console.html it automatically loads the console with the credentials of the logged on user.
Launching the Management Console via Load Balanced DNS name works on every other server except itself.... assume this is Kerberos modifications? (This only happens when I disable the appv-2 node on the load balancer, forcing all IIS connections to Appv-1).
The management server issue above is not a big one and can work around that easily. The major issue is with the Publishing Server. .. .
On Appv-2 if I browse to http://appvpubsrv.fqdn:8090 it will prompt for authentication, once enter it displays: Method not allowed. Please see the service help page for constructing valid requests to the service.
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Getting server publishing data failed.
URL: http://appvpubsrv.fqdn:8090
Error code: 0x45500D27 - 0x80190195
Any help will be greatly appreciated. ....

You could read
https://blog.uvm.edu/jgm/2013/09/26/app-v-5-server-f5-load-balancers-and-kerberos/
https://blog.uvm.edu/jgm/2013/09/27/app-v-server-configuration-load-balanced-configuration/
http://social.technet.microsoft.com/Forums/en-US/2b39e2b8-aba1-4e96-b18f-c5bcb9f12687/load-balancing-two-appv-50-servers-the-publishing-service-is-not-able-to-contact-the-management?forum=mdopappv
http://www.thinclient.net/blog/?p=344
In fact I'm not sure if any of these really helps you, but they give some good advice
Falko
Twitter
@kirk_tn   |   Blog
kirxblog   |   Web
kirx.org   |   Fireside
appvbook.com

Web Proxy Server Load Balancing

I deployed Sun Jave Web Proxy Server 4.0 as a Reverse Proxy. I would also like to use it as a load balancer. As per the instructions, I configured the obj.conf file as shown below
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NameTrans fn="reverse-map" from="https:xx.xx.xx.xx" to="https://server.net" rewrite-location="true" rewrite-content-location="true"
NameTrans fn="redirect" from="http://server" url="https://xx.xx.xx.xx"
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Motor,
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Thanks
To Create Regular or Reverse Mapping
Access the Server Manager, and click the URLs tab.
Click the Create Mapping link.
The Create Mapping page is displayed.
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for example,
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Source destination: http://http.site.com/
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Reverse mapping:
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from: /
to: http://http.site.com/
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App.server load balancing for SAP System with 1 PS

Hi,
In SAP CPS 7.0 (Build M26.12) I have a SAP system with Central Instance + 10 App.servers, but all instances are managed by 1 ProcessServer.
After activating the "App.server load balancing" setting in SAP system definition the application servers are becoming visible in CPS with their load factors (number of BGD wp's on app.servers) and load numbers (number of active jobs on app.servers).
This is so far fine, but the additional functionality is not working as I would expect, I have issues with 2 functionalities:
1. Based on documentation after activating also the XAL connection the CPS should submit the job on app.server with best performance based on XAL monitoring data filling the TARGET_SERVER parameter.
This functionality is not working for me at all
2. A useful functionality after activating the "App.server load balancing" setting is that the ProcessServer is going to "Overloaded" status when all BGD wp's of SAP system are occupied, thus restricting submitting new jobs during overload situation. But I had an issue also with this functionality, after SAP system recovery from overload situation, the CPS still remained in Overload status (so no new jobs were submitted).
As a workaround I had increased the treshold values for loads on all app.servers for this SAP system, what was fine for several days, but after a while I believe this was a reason of unexpected performance issues in CPS, therefore I have deactivated the 'App.server load balancing" setting at all for this ProcessServer.
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Thanks and Regards,
Ernest Liczki

Hi Preetish,
This connect string option is to loadbalance RFC connections. These are balanced upon login, once you are connected to a particular application server (AS) you stay on that server until you reconnect.
Since CPS uses multiple RFC connections, this will result in the connections being distributed over the available AS resources which is fine as long as they are generally evenly loaded. If you have certain AS hosts that are continuosly more loaded than the rest, then you probably don't want the CPS RFC connections to end up on these servers.
The original question is about loadbalancing of batch jobs over the available AS resources, and this is done independent of the RFC connection load balancing. Even if all CPS RFC connections are pinned to the DB/CI host, you can still loadbalance jobs over the available SAP AS hosts, either by using SAPs builtin balancing, or the CPS algorithm by activating the checkbox as indicated in the first entry in this thread.
Finally, to reply to Ernest's question: I believe there are some fixes on the app load balancing in the latest release, M26.17 should be available on the SWDC now.
Regards,
Anton.
Edited by: Anton Goselink on May 29, 2009 9:06 PM

Dev6 Server Load Balancing

Hi
I try to install Load Balancing with Dev6/Patch2 and OAS4.0.7.1
on 4 Machines with WinNT Server 4 SP 5. I tried to do it as
described in the documentation. But I did not succeed. It seems
to be that the Doc is not complete or wrong. Could somebody give
an example how to set up the LB Servers and Clients as NT
Services ?
Thank's in advance
Charly
null

Hi Steven,
No LACP and SLB are different.
LACP is the Link Aggregation Control Protocol, which is the protocol used within the IEEE 802.3ad (now 802.1AX) Link Aggregation mechanism to control the bundling and unbundling of the physical links into an aggregate link.
Server Load Balancing is a feature in IOS to load balance traffic destined to a virtual IP across a group of real IP. From Configuring Server Load Balancing:
The SLB feature is a Cisco IOS-based solution that provides IP server load balancing. Using the IOS SLB feature, the network administrator defines a virtual server that represents a group of real servers in a cluster of network servers known as a server farm.
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Regards

Server Load balancing issues

the servers are loadbalancing between the switches '3'
and '2' and the link between the two switches is blocked.
This link was forwarding before and thus any traffic going to the server was
send to the Servers correctly no matter on which switch they are active.
However after addition of another link in between the switches 'root'
and '1', the path cost to the root has decreased and thus the link
between the '2' and '3' is Blocking and the other link between
the '2' and '1' is Forwarding as it should be ideally. But
this would be creating an issue because the trafic coming from outside i.e.
through switch '1' to the server will be correctly send to the
server if the server NIC is active on the '3' because the Virtual MAC
addresses are binded accordinlgy. In case the server falls onto the other
NIC which is on the '2' the traffic won't be able to pass because the
MAC address is not binded on the trunk connecting the switches '1'
and '2'. This binding cannot be done because the same MAC address is
being learned on the another trunk on the '1' which is connecting
to 'root'. So if we bind the same Virtual MAC on two trunks on the same
switch ('1') then this will cause MAC Address Flapping on the
switch and hence canot be done.
In another case,we can able to bind virtuak MAC on two trunks on the same
switch('1') and it's working fine.
The servers are load balancing in round robin fashion. each server has 2 NICs and work in Active-Passive mode. The servers load balance each other when all their active links are connected to '3' switch but when two of the active NICs of two servers are connected to '3' and the rest of the two active NICs from the other two servers are connected to '2' switch then only the forst 2 servers load balance and the other 2 servers do not load balance.
Please help.
Thanks in advance.

In my experience, server load balancing is one of the most difficult things to get going properly in a switched LAN environment. Switched LANs are designed so that one MAC address can only be bound to one switch port. Therefore, if you have two NICs with the same MAC address (real or virtual), then you will get flapping somewhere.
I have seen various ways that the manufacturers try to get around this limitation of switched LANs. For example, one technique I have seen, practiced by ISA Server, is to use a multicast MAC address for the service so that frames go to both exit ports. But that does not always work well unless you tweak the network to acommodate it.
What sort of servers are they, and what system is used for the load balancing?
Kevin Dorrell
Luxembourg

Using ACE for proxy server load balancing

Hello groups,
I wanted to know your experiences of using ACE for proxy server load balancing.
I want to load balance to a pool of proxy servers. Note: load-balancing should be based on the HTTP URL (i can't use source or dest. ip address) so that
a certain domain always gets "cached/forwarded" to the same proxy server. I don't really want to put matching
criteria in the configuration (such as /a* to S1, /b* to S2, /c* to S3,etc..), but have this hash calculated automatically.
Can the ACE compute its own hash based on the number of "online" proxy servers ? ie. when 4 servers are online, distribute domains between 1,2,3,4 evenly.
Should server 4 fail, recalculate hash so that the load of S4 gets distributed across the other 3 evenly. Also load-balancing domains of S1 ,S2 and S3 should not change if S4 fails.....
regards,
Geert

This is done with the following predictor command:
Scimitar1/Admin# conf t
Enter configuration commands, one per line. End with CNTL/Z.
Scimitar1/Admin(config)# serverfarm Proxy
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content         Configure 'hash http content' Predictor algorithms
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This command has been designed for this kind of scenario that you describe.
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WLC Radius Server Load Balance

Hi,
Can someone provide me detailed description on how WLC Radius Server Load balance works.
Becuase, I encounted a problem of User Authenticated with the 1st Radius Server, but Accounting Records are actually on 2nd Server .
Any response will be very appreciated
-Angela

Hi Angela,
I pasted below the part of config guide explaining the different modes. In summary :
-Fallback off means : when 1st radius server shows dead , WLC moves to the second. And will only change again when the 2nd is dead too.
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config radius fallback-test mode {off | passive | active}
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•active causes the controller to revert to a server with a lower priority from the available backup servers by using RADIUS probe messages to proactively determine whether a server that has been marked inactive is back online. The controller simply ignores all inactive servers for all active RADIUS requests. Once the primary server receives a response from the recovered ACS server, the active fallback RADIUS server no longer sends probe messages to the server requesting the active probe authentication.

CSM(content switching module) supports the 2 tier server load balance ?

hi everyone,
Does any know the CSM support 2 tier server load balance ?
this means that CSM perform the server load balance for servers and the same servers require another time Server load balance. In the other word,
the CSM supports server port and client port for server load balance ?
thanks
fred.

Hi, this seems to describe a typical case of multi-tier design where the CSM needs to handle 2 types of connections:
1. clients->CSM->serverfarm1
2. serverfarm1->CSM->serverfarm2
We usually refer to the second type of connections as server-to-server load balanced traffic.
There is no problem in handling that scenario with the CSM and you have a few options.
In particular, each virtual server on the CSM can be configured to only accept incoming connections from a specific VLAN, so you can use that as an additional security measure or to distinguish connections based on which VLAN they come in from.
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One important thing to keep in mind when handling server-to-server load balanced connections: if serverfarm1 and serverfarm2 are on the same VLAN, you have to configure "client NAT" for the server-to-server connections, to force the return traffic back to the CSM.

Please provide vShield Manager Server Load Balance values

Hi All:
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Please provide these value:
1. Throughput      Mbps
2. Web port 80 server load balance connections:
3. SSL port 443 server load balance connections:
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BR.
                        Vincent

Hi Vincent,
Can you please eloborate your question ?

Server load balancing for application access using multiple servers

1.what are the methods supported by cisco switches for load balancing
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Hi Sergiy,
We currently have the Scheduled Tasks turned off so I know that it is not causing the slow down. I also know that we do not have any custom code that is hitting those tables, as I am the only one that is doing any of the customization.
However, you bring up an excellent point with regards to other Activities. We have noticed that this does not occur at specific times so that would suggest it was not on some sort of schedule so perhaps a certian Activity is the cause. You mentioned "RMA SFC Receipt", could you find out if there are any other sorts of Activities that may cause this while I look into this one?
I will perform some tests on our Test machine with the "SQL Trace" and "Debugging Information" turned on as you suggested.
Thanks,
Mike

Patch applying on Two node application server(load balancing)

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