Question Cluster/Load balancing

Question about iplanet load balancing/Cluster:
Following discussion are based on iAS C++ engine(kcs).
We have four web servers and two iAS servers:
Web1, Web2, Web3, Web4
iAS1, iAS2
All machines run Solaris 8, web server is iWS4.1 SP6,
Application server is iAS6.0 SP2, and both iAS boxes have
same hardware configuration.
1. What's the best load balancing method for this structure?
Per Server Response Time(Web Connector Driven)
Per Component Response Time(Web Connector Driven)
Round Robin(Web Connector Driven)
User Defined Criteria(iAS Driven)
2. What's the criteria for the kxs engine to choose the kcs
engine to sent request if we set Web Connector Driven
load balancing?
3. If we set iAS driven load balancing, what's the criteria
for the web connector used to choose kxs?
4. We got a problem when run load testing for an AppLogic
in this cluster, one iAS CPU average usage got almost
100%, but the other one is just 70%.
We used Per Server Response Time load balancing method.
Thanks.
Heng

see answers inline
hcao wrote:
Question about iplanet load balancing/Cluster:
Following discussion are based on iAS C++ engine(kcs).
We have four web servers and two iAS servers:
Web1, Web2, Web3, Web4
iAS1, iAS2
All machines run Solaris 8, web server is iWS4.1 SP6,
Application server is iAS6.0 SP2, and both iAS boxes have
same hardware configuration.
1. What's the best load balancing method for this structure?
Per Server Response Time(Web Connector Driven)
Per Component Response Time(Web Connector Driven)
Round Robin(Web Connector Driven)
User Defined Criteria(iAS Driven)
it depends on the characteristics and behaviour of your application
>
2. What's the criteria for the kxs engine to choose the kcs
engine to sent request if we set Web Connector Driven
load balancing?
kxs always does round robin to the kjs or kcs engines. The webconnector
selects the kxs to which to send to.
>
3. If we set iAS driven load balancing, what's the criteria
for the web connector used to choose kxs?
as specified by your criteria in the iAS driven section.
The ias instance will send its current list of preferences for ias
intances it got from the criteria to the webconnector. This information
is dynamic and updated constantly.
>
4. We got a problem when run load testing for an AppLogic
in this cluster, one iAS CPU average usage got almost
100%, but the other one is just 70%.
We used Per Server Response Time load balancing method.
again, this can be a valid result depending on the way your applogics
are written. Are they CPU bound, I/O bound or DB bound? Since individual
components execute differently and you specified to use the average of
those results to determine load balancing this can be a valid result
because differences in execution times of your applogics.
>
Thanks.
Hengregards
Han-Dat
Consulting Project Engineer
iPlanet Professional Services - ANZ
iPlanet e-commerce Solutions
- A Sun|Netscape Alliance
Sun Microsystems Australia Pty Ltd

Similar Messages

Cluster / Load balancing and no. of user

Hi
Just wondering what kind of cluster / load balancing setup is need for e.g. 50 concurrent users ? and what's the deciding factor that will justify additional presentation service / BI server to be added to an existing cluster farm ?
Or maybe if you guys could share what's the cluster setup that you have and the number of users that would greatly help me to get a rough idea of the kind of setup needed. E.g. 2x presentation services and 2x BI server with 100 users, estimated 50 concurrent users, etc..
Thanks in advance !

If there are 50 concurrent users, I don't think that you need to go for clustering. You can use more resources like increasing the RAM size and increasing th CPU count.
If you opt for 64 bit operating system ,it would give you better performance.
Regards
Rajesh J

Cluster/load balance weblogic using L4 switch like Alteon

Can I install weblogic as a standalone server on 2 or more server and
          cluster/load balance weblogic using a hardware balancer like Alteon Layer4
          switch (of course I will use a centralised storage to maintain a single copy
          of data which will eliminate syncronizing problem among servers)?
          BTW, Alteon can support persistent binding. The reason to use a Layer 4
          switch is that it is very fast, and this will make the application server
          layer transparent to client, the client can think this is a single server
          (it don't need to know whether there are 5 weblogic servers or 20 weblogic
          servers behind switch), and hardware are more reliable, sacalable and fast.
          I am not sure whether the normal weblogic clustered servers need to
          share/exchange info on the running memory, if it does, this approach will
          fail.


So My understanding is:
          Alteon with WL 6.0 can do load balancing for:
          entity bean
          stateless session bean
          but can't do load balancing for:
          stateful session bean (will persistent/sticky binding solve part of the
          problem except fail-over)
          in-memory replication
          am I right?
          Pao Wan
          "Don Ferguson" <[email protected]> wrote in message
          news:[email protected]...
          > It is possible to configure Alteon to understand the WebLogic 6.0 cookie
          format
          > and have a proxy-less cluster configuration that performs load balancing
          and
          > fail over of session state.
          >
          > It is also possible to configure Alteon's hardware-based SSL decryption
          for really
          > fast HTTPS processing.
          >
          > We are working on a white paper that describes how to configure Alteon for
          use
          > with WebLogic Server 6.0.
          >
          > -Don
          >
          >
          > Robert Patrick wrote:
          >
          > > Cameron,
          > >
          > > I believe that BEA tested their new proxy-less web clustering solution
          with
          > > load-balancing products from Alteon and several other vendors
          (Arrowpoint ?--
          > > which is now Cisco). However, it was my understanding that these
          products do
          > > not understand how to decrypt our cookies and extract IP addresses but
          rather
          > > these products are capable of doing sticky load balancing based on the
          Session
          > > ID contained in our cookie.
          > >
          > > If this is correct, then what this means is that when the primary server
          fails,
          > > the request will be routed to "some other server" in the cluster but not
          > > necessarily the one that holds the secondary copy of the user's session.
          The
          > > change in WLS 6.0 is that WLS will accept these misdirected requests and
          it will
          > > go out to the correct server and "migrate" the session to the server
          that
          > > received the request making that server the new primary (and
          regenerating the
          > > Session ID).
          > >
          > > I am sure if this is wrong that our product manager or one of our
          engineers will
          > > correct me (please?)...
          > >
          > > Hope this helps,
          > > Robert
          > >
          > > Cameron Purdy wrote:
          > >
          > > > Hi Robert,
          > > >
          > > > FWIW - There are several vendors (Primeon? Arrowpoint?) who claim to
          > > > understand WL cookies and parse the IPs out. (I haven't verified it
          myself
          > > > though.)
          > > >
          > > > --
          > > > Cameron Purdy
          > > > Tangosol, Inc.
          > > > http://www.tangosol.com
          > > > +1.617.623.5782
          > > > WebLogic Consulting Available
          > > >
          > > > "Robert Patrick" <[email protected]> wrote in message
          > > > news:[email protected]...
          > > > > There are not any hardware vendors (yet) that can understand
          WebLogic's
          > > > session
          > > > > ID. While you might be able to use the load balancer without the
          proxy on
          > > > 5.1,
          > > > > you would not be able to take advantage of in-memory replication
          failover
          > > > unless
          > > > > you only had two machines in the cluster. Like you said, everything
          will
          > > > work
          > > > > with 6.0 regardless of how the load balancer works (though you
          really,
          > > > really
          > > > > want to minimize the number of times the requests come into the
          wrong
          > > > server by
          > > > > utilizing sticky load balancing).
          > > > >
          > > > > Hope this helps,
          > > > > Robert
          > > > >
          > > > > Cameron Purdy wrote:
          > > > >
          > > > > > Rajesh,
          > > > > >
          > > > > > I meant that it would work in lieu of a proxy (such as Apache or
          NES)
          > > > with
          > > > > > 5.1, but only if both the hw load balancer and WL were set up to
          use
          > > > > > cookies. Some hw load balancers rely on IP and that doesn't
          work -- AOL
          > > > > > connections for example can change the source IP on the fly.
          Others
          > > > produce
          > > > > > their own cookies, that will work. Some even can use WL cookies
          and
          > > > parse
          > > > > > them to determine where to go. According to what I've read, with
          6.0 if
          > > > the
          > > > > > WL primary dies or for some other reason the request shows up at
          the
          > > > "wrong"
          > > > > > server, it will be handled correctly. That means you are pretty
          safe
          > > > with
          > > > > > hw load balancers and 6.0, almost regardless of the sticky
          > > > implementation
          > > > > > that they use.
          > > > > >
          > > > > > --
          > > > > > Cameron Purdy
          > > > > > Tangosol, Inc.
          > > > > > http://www.tangosol.com
          > > > > > +1.617.623.5782
          > > > > > WebLogic Consulting Available
          > > > > >
          > > > > > "Rajesh" <[email protected]> wrote in message
          > > > > > news:[email protected]...
          > > > > > >
          > > > > > > Hi Cameron,
          > > > > > > Can you elaborate on how it would work with WL5.1 since no in
          memory
          > > > > > replication
          > > > > > > would happen if the servers are standalone.
          > > > > > >
          > > > > > > "Cameron Purdy" <[email protected]> wrote:
          > > > > > > >Yes, this will work fine with WL6. (WL5.1 will work fine as
          long as
          > > > > > cookies
          > > > > > > >are used by the load balancer.)
          > > > > > > >
          > > > > > > >--
          > > > > > > >Cameron Purdy
          > > > > > > >Tangosol, Inc.
          > > > > > > >http://www.tangosol.com
          > > > > > > >+1.617.623.5782
          > > > > > > >WebLogic Consulting Available
          > > > > > > >
          > > > > > > >
          > > > > > > >"paowan" <[email protected]> wrote in message
          > > > > > > >news:[email protected]...
          > > > > > > >> Can I install weblogic as a standalone server on 2 or more
          server
          > > > and
          > > > > > > >> cluster/load balance weblogic using a hardware balancer like
          Alteon
          > > > > > Layer4
          > > > > > > >> switch (of course I will use a centralised storage to
          maintain a
          > > > single
          > > > > > > >copy
          > > > > > > >> of data which will eliminate syncronizing problem among
          servers)?
          > > > > > > >>
          > > > > > > >> BTW, Alteon can support persistent binding. The reason to use
          a
          > > > Layer
          > > > > > > >4
          > > > > > > >> switch is that it is very fast, and this will make the
          application
          > > > > > server
          > > > > > > >> layer transparent to client, the client can think this is a
          single
          > > > > > server
          > > > > > > >> (it don't need to know whether there are 5 weblogic servers
          or 20
          > > > > > weblogic
          > > > > > > >> servers behind switch), and hardware are more reliable,
          sacalable
          > > > and
          > > > > > > >fast.
          > > > > > > >>
          > > > > > > >> I am not sure whether the normal weblogic clustered servers
          need to
          > > > > > > >> share/exchange info on the running memory, if it does, this
          > > > approach
          > > > > > will
          > > > > > > >> fail.
          > > > > > > >>
          > > > > > > >>
          > > > > > > >
          > > > > > > >
          > > > > > >
          > > > >
          >

Question about Load balancing with IISPROXY

          Hi,
          We are running WLS 5.1.0 SP5 on NT 4.0 SP6. We are not using clustering.
          We are able to round robin between multiple instances of the WLS successfully.
          Question: If one of the instances of WLS goes down, is there any way to configure
          the plugin to take it out of the loop automatically (without using clustering)?
          Thanks,
          Anil.


This is not the syntax. Syntax is just this:
          MaxSkips=something.
          eg: MaxSkips=25
          The doc says:
          5:10:1000 for min:default:max
          By which we mean that default value is 10, max is 1000 and min is 5. I guess the
          docs are confusing about the syntax here. We will correct them.
          --Vinod.
          Anil Kommareddi wrote:
          > Vinod,
          > I could not find any documentation on the MaxSkips parameter except in the Service Pack
          > docs. The syntax is MaxSkips=min:default:max.
          >
          > how do the min and max parameters work?
          >
          > Vinod Mehra wrote:
          >
          > > Even if the servers in the WebLogicCluster list are non clustered you WILL be
          > > able to do load balancing. But the problem is if the servers go down the plugin
          > > will not remove them. But it not that bad. If an connection attempt fails the
          > > server is marked as bad and will be skipped for the next MaxSkips (default=10)
          > > cycles of load balancing. MaxSkips parameter is configurable for IISProxy
          > > (SP4 onwards, I think).
          > >
          > > -Vinod.
          > >
          > > Prasad Peddada wrote:
          > >
          > > > I believe there won't be any load balancing unless you use servers in a cluster. As
          > > > an alternative you can use hardware load balancers directly in a situation like this.
          > > >
          > > > Anil Kommareddi wrote:
          > > >
          > > > > Hi,
          > > > >
          > > > > We are running WLS 5.1.0 SP5 on NT 4.0 SP6. We are not using clustering.
          > > > > We are able to round robin between multiple instances of the WLS successfully.
          > > > >
          > > > > Question: If one of the instances of WLS goes down, is there any way to configure
          > > > > the plugin to take it out of the loop automatically (without using clustering)?
          > > > >
          > > > > Thanks,
          > > > > Anil.
          > > >
          > > > --
          > > > Cheers
          > > >
          > > > - Prasad

Question about Load Balance SFTP service by using CSS1150X

Does anyone come across of load balancing SFTP service by using CSS1150X? Typically by configuring CSS1150X to load balance FTP service, the configuration will as follow:
content ftp_rule
vip address 192.168.3.6
protocol tcp
port 21
application ftp-control
add service serv1
add service serv2
add service serv3
active
group ftp_group
vip address 192.168.3.6
add service serv1
add service serv2
add service serv3
active
However, for my personal understanding and knowledge, I will configure my CSS1150X as follow to load balance SFTP service:
content sftp_rule
vip address 192.168.3.6
protocol tcp
port 22 //Change 21 to 22
application ftp-control
add service serv1
add service serv2
add service serv3
active
group sftp_group
vip address 192.168.3.6
add service serv1
add service serv2
add service serv3
active
My question is, "application ftp-control" in content "ftp_rule" is still applicable to SFTP or not?

I believe application ftp-control would not be used for sftp.
This might cause the session to get dropped when there is no data channel created and cause issues with long connections.
Hope it helps!!

Cluster (Load balancing) implementation in obiee 10g

Hi All,
We need to implement clustering (Active-Active for Load balancing) in our project. We use both analytics and bi publisher. We also need to deploy analytics/bipublisher in to weblogic server for SSO purpose.
Now we have two machines.
As of now We did the installation of obiee10g (while installing we selected "Complete" button) in both machines. Could any body tell us how to implement clustering w.r.t to weblogic.
To proceed futher we need to know..
+1. Did normal clusrtering method in 10g with oc4j server differs when we deploy application in weblogic server..?+
+2. Can I use any of the two machines to create a shared folder and place rpd to give the path in REPOSITORY_PUBLISHING_DIRECTORY or should I use third machine other than these two machine..???+
Any help is greatly apprciated.
Thanks & Regards,

Hi User,
Did you configured clustering wrt to OC4j or WLS..?
A. Weblogic.
2. Can you tell me how it differs wrt WLS..??
A. We can't explain here please refer the following link.
http://www.iwarelogic.com/2010/01/supply-chain-management-w-r-t-oracle-applications-312/
http://docs.oracle.com/cd/E23943_01/upgrade.1111/e10126/wls_oc4j_comparisons.htm
3.On top of these two machines we have a virtual IP?
A. You can use virtual Ip's.
In your project Weblogic also clustering mode am I write?
What could be the process.. First we need to follow the clustering method as if there was no WLS and later deploy the application and need to do the changes wrt to WLServer (or) First we need to deploy the application in WLServer and for clustering need to do changes in/wrt to WLServer..??
A . First we need to deploy the application in WLServer and for clustering need to do changes in/wrt to WLServe.
Note: As per my knowledge please implement this way.
1. Deploy analytic.war in your weblogc.
2. If it is possible please implement Weblgoc clustering also.
3. SSO implementation.
4. Cluster implementation.
This is the way am implemented in my project.
My project tool details.
1. Weblogic
2. OBIEE 10.1.3.4.1
3. Oracle 11g
4. OS - AIX
If you have any concerns please post me.
Award points it is useful.
Thanks,
Satya
Edited by: satya R on Apr 1, 2012 9:03 PM

IIS WLS6.1 SP3 and cluster load balancing

I am setting up an installation with IIS, WLS6.1 SP3 using a cluster. Monitoring
the instances in the cluster the entire load is going to one instance. If that
instance is stopped the other takes over, no problem. If I set DynamicServerList
to off in the iisproxy.ini file the load balances correctly.
Is there a way to ensure WLS sends the dynamic server list as advertised? Failing
that what are the problems that may arrise from not using the Dynamic Server List?

I would like to see the entries in your iisproxy.ini file?
Can you post 'em?
Kumar
Danny Newman wrote:
I am setting up an installation with IIS, WLS6.1 SP3 using a cluster. Monitoring
the instances in the cluster the entire load is going to one instance. If that
instance is stopped the other takes over, no problem. If I set DynamicServerList
to off in the iisproxy.ini file the load balances correctly.
Is there a way to ensure WLS sends the dynamic server list as advertised? Failing
that what are the problems that may arrise from not using the Dynamic Server List?

Ironport Cluster Load Balancing

Anyone knows if it is possible to configure a load balancing of two C100 in a cluster.
I configured the second machine in the cluster two weeks ago. when I look in the stats, the second machine does nothing. the first machine is on 3% CPU and whe have about 120000 mail per day.
is there any way to configure the cluster that the two machine share their work ? or is the cluster only for fail-safe ?

Hello,
Most mail admins know how to use MX records for load balancing (and redundancy) on their mail servers.
Less people know you can use MX also for your outgoing mail traffic.
Just add a MX record to your local DNS and specify a name for the record. (i.e. outgoingMX.local.domain) put the IP's or hostnames of your internal Ironport card in the data and configure your internal mail system to deliver it’s outgoing mail to smarthost outgoingMX.local.domain
Works for most mail systems. I'm sure it is working for Exchange (5.5. and higher) and Domino (5 and higher)
Regards, Steven

Cluster load balancing problems under heavy load.

          Hi,
          I am running 2 WLS 5.1 sp6 application servers on Solaris 7.
          2 Apache 1.3.12/Raven SSL webservers using the Raven proxy (also
          Solaris).
          My problem is this:
          The application appears to be load balancing and replicating
          session information fine under regular load. But when a heavy
          load is put on the system, load balancing seems to stop.
          One of the application servers processes all of the sessions
          while the other is just replicating session info. The CPU
          usage on the server doing all of the work was 60%, and on the
          secondary server it was only 2.5%.
          Do I have something set incorrect? I would think that if load
          balancing works for a small load on the system, it should be
          the same for a large load.
          Has anyone seen this type of behavior before?
          Thanks


1.5G of heap is quite huge. Take a thread dump when you see the slow down.
          Does each clients start a new session and maintain it for the duration of the test.
          There is no property called weblogic.cluster.bindAddr
          -- Prasad
          Nick Barbato wrote:
          > Hi,
          >
          > There are no 'timed out server" messages in the log. I don't think
          >
          > that is the problem because I can see the secondary server
          >
          > replicating session information.
          >
          > It is jdk1.2.2_005a. The java options I am using are:
          >
          > java $THREAD_ARG \
          > -ms1536m -mx1536m \
          > -classpath "$CYGENT_SYS_CP" \
          > -Dweblogic.class.path="$CYGENT_WLS_CP" \
          > -Dweblogic.system.home=$CYGENT_ROOT/runtime \
          > -Dweblogic.system.propertiesFile=$CYGENT_ROOT/runtime/conf/weblogic/weblogic.properties
          >
          > \
          > -Djava.security.manager \
          > -Djava.security.policy==$CYGENT_ROOT/runtime/conf/cygent.policy
          > \
          > -Dcygent.root=$CYGENT_ROOT/runtime \
          > -Dweblogic.cluster.enable=true \
          > -Dweblogic.cluster.name=mycluster \
          > -Dweblogic.cluster.bindAddr=166.37.216.142 \
          > -Dweblogic.cluster.multicastAddress=237.0.1.0 \
          > cygent.Server $CYGENT_ROOT/runtime/conf/
          >
          > Thanks,
          > Nick
          >
          > "Mike Reiche" <[email protected]> wrote:
          > >
          > >I've seen this before - when one WL instance drops out
          > >of the
          > >cluster.
          > >
          > >Look for 'Timed out server' messages in weblogic.log.
          > >
          > >What JDK are you using? What JVM options.
          > >
          > >Mike
          > >
          > >"Nick Barbato" <[email protected]> wrote:
          > >>
          > >>Hi,
          > >>
          > >>I am running 2 WLS 5.1 sp6 application servers on Solaris
          > >>7.
          > >>2 Apache 1.3.12/Raven SSL webservers using the Raven
          > >proxy
          > >>(also
          > >>Solaris).
          > >>
          > >>My problem is this:
          > >>The application appears to be load balancing and replicating
          > >>session information fine under regular load. But when
          > >>a heavy
          > >>load is put on the system, load balancing seems to stop.
          > >>One of the application servers processes all of the sessions
          > >>while the other is just replicating session info. The
          > >>CPU
          > >>usage on the server doing all of the work was 60%, and
          > >>on the
          > >>secondary server it was only 2.5%.
          > >>
          > >>Do I have something set incorrect? I would think that
          > >>if load
          > >>balancing works for a small load on the system, it should
          > >>be
          > >>the same for a large load.
          > >>
          > >>Has anyone seen this type of behavior before?
          > >>
          > >>Thanks
          > >

Question about load balancing between Portal and ABAP

Hi,
I have the problem whit load balancing between Portal and ECC (ERC) ABAP
Exist two system:
1) ECC (ERP) ABAP = Backend Module = HR
2) EP (JAVA) = Frontend
The users (9000 users) logon in the EP and run query (data personal) in the ECC. The problem to all user connect in Central Instance and not in the Dialog Instance.
How can balancing the conecction HTTP (EP) to ECC (ABAP)??
I need balancing in the ECC to Dialog Instance

Jco -> right. Another possibility is that you use iviews that point to the backend in this case you will need to use a load balanced entry for the backend system in the [system landscape|http://help.sap.com/saphelp_nw70ehp1/helpdata/en/47/8c1e438d7017fce10000000a42189c/frameset.htm] -> SAP_R3_LoadBalancing
If you have ESS deployed on your portal, you will most probably need to do both.
Cheers Michael

Question about Load Balancing Wireless connections using WLC- F5- ISE

Hi all,
Can anyone give me some orientation how the radius auth process/handshake between the WLC and ISE changes once the F5 is installed in the middle in order to perform load balancing?
We can do some kind of load balancing by configuring different radius servers on each WLC for which, I must configure the same shared secret in the WLC and ISE so the radius request/accept could be processed.
Now that we have the F5 in the middle, do I need to create/configure the same shared secret in the F5 so radius transactions can be processed by this device?. Based on the following link, I must configure the F5 in the ISE like another NAD device (similar to the WLC) but I do not know if this additional configuration in the ISE includes the Auth parameter to be added in the ISE NAD (F5) configuration.
How to properly use a load balancer in Cisco's Identity Services Engine
http://www.networkworld.com/community/blog/load-balancing-cisco-identity-services-engine
Our sheme is shown next,

When you covert the pair into SSO, all the APs will go to the ACTIVE unit. No unit will "live" in the standby unit because this unit will "share" the AP-support license between the two.
This is the first step you need to get sorted. Send an email to [email protected] and give them the exact details of what you want to do (i. e. AP SSO) and then provide the serial number of your nominated active WLC and the serial number of your nominated standby WLC.

Mysql cluster load balancing

Hi there ! Could somebody guide me a bit on how to load balance Mysql servers ? Actually we can do read-only querys but on other operations the Mysql client we use says that "can't lock file". I think the balancer send that stream to one Mysql server but then when It goes back it doesn't know what is the correct place to send it. Thanks. We are doing it with a CSS, and we have two Mysql servers to process the queries.

There are a couple of ways of scaling out using Mysql clusters and load balancing. The most common is to create a pool of read only servers, and then on the initiator split ro and rw transactions to seperate vips in your load balancer.
For redundant RW transactions you can either do a Hot Hot setup on your mysql servers, or do a publisher subscriber, where you have a hard failover. In that case you need to configure your loadbalancers to only use the publisher, and to only use the subscriber if the publisher is dead.
--Colin

Question RAC load balance with app

Hi there,
How RAC help load balance the database if most of my applications connection use JDBC with specific IP or hostname. I'm using JDBC:thin client and not OCI.
Is there configuration that allows the application without specify the hostname? If I SQLPLUS, I can logon to the database with username/password and SID. I know the connection is going through Oracle Net with the tnsnames.ora file.
Thanks

Hi,
Thin JDBC supports multiple specifications for connection url. You can refer to this document http://download.oracle.com/docs/cd/B19306_01/java.102/b14355/urls.htm#BEICDECB for more information.
--romas

Jms in cluster / load balancing and failover

          Did I get it right ???
          I have 1 admin server and 4 managed servers in a 2 clusters, a development cluster
          and a test cluster.
          I now want to have loadbalancing with my jms server and I want to be able to migrate
          my jms server in case of failer.
          for each cluster I have created
          connectionFactory targeted to the cluster
          Distributed destination with 2 queue members
          One JMSServer migratable targeted on managed server 1, with destination 1 from
          the ditributed destination
          One JMSServer migratable targeted on managed server 2, with destination 2 from
          the ditributed destination
          I expect this to make loadbalancing between the 2 servers in the cluster, and
          I can migrate the jms server if one of the server fails to the running server.
          One thing is now.....If one server fails and I migrate the jms server to the other
          server that is running, and I then restart the server that was down, what is then
          happening, do I then have 3 jms servers ???
          [config.xml]


          "Kris" <[email protected]> wrote in message news:[email protected]...
          >
          > "Kawaljit Singh Sunny" <[email protected]> wrote:
          > >
          > >"Kris" <[email protected]> wrote in message
          > >news:[email protected]...
          > >>
          > >> Did I get it right ???
          > >>
          > >> I have 1 admin server and 4 managed servers in a 2 clusters, a
          development
          > >cluster
          > >> and a test cluster.
          > >> I now want to have loadbalancing with my jms server and I want to be
          > >able
          > >to migrate
          > >> my jms server in case of failer.
          > >>
          > >> for each cluster I have created
          > >> connectionFactory targeted to the cluster
          > >> Distributed destination with 2 queue members
          > >> One JMSServer migratable targeted on managed server 1, with destination
          > >1
          > >from
          > >> the ditributed destination
          > >> One JMSServer migratable targeted on managed server 2, with destination
          > >2
          > >from
          > >> the ditributed destination
          > >
          > >If the server where your JMSConnections are loadBalanced to goes down,
          > >the
          > >producers and consumers using this JMSConnection are closed.
          > >You have to recreate these producers and consumers.
          > >If the server where your Destination resides goes dow, the consumers
          > >are
          > >closed.
          > >If the producers JMSConnection is not on this server, the producer stays
          > >up.
          > >
          > >>
          > >>
          > >> I expect this to make loadbalancing between the 2 servers in the
          cluster,
          > >and
          > >> I can migrate the jms server if one of the server fails to the running
          > >server.
          > >>
          > >> One thing is now.....If one server fails and I migrate the jms server
          > >to
          > >the other
          > >> server that is running, and I then restart the server that was down,
          > >what
          > >is then
          > >> happening, do I then have 3 jms servers ???
          > >
          > >No you still have 2 JMSServers. JMS Migration is manual.
          > >
          > >>
          >
          > you say : No you still have 2 JMSServers. JMS Migration is manual.
          >
          > But if I manual migrate the jmsserver that was down to the running wls
          server,
          > that already have one jms server running, this wls server must then have 2
          jms
          > servers. And I boot the wls server that hosted the jms server that was
          down, this
          > will now have a running jms server. isn't that 3 jms servers ?
          Once you migrate a JMSServer from a WeblogicServer1 to WeblogicServer2,
          and then you boot WeblogicServer1, this JMSServer which was migrated should
          NOT be on WeblogicServer1.
          (You have migrated the JMSServer from WeblogicServer1 to WeblogicServer2)
          >
          > But I was thinking about that I could spare the migration part. If I have
          2 wls
          > servers and a jms server on each of them, and a destributed destination
          with 2
          > queue members that are persistent in a database. If a wls og just a jms
          server
          > goes down, I just have to reboot the server and it will run again. This
          way I
          > dont have to think about migration, or what ?
          Yes that is true.
          Irrespective of whether you have migration or not,
          only thing you need to do take care is to reconnect to weblogic server, if
          the the server where your JMSConnection is loadBalanced to goes down.
          There is no failover of JMSConnections. Producers inside this JMSConnection
          will be closed. You will have to create a new JMSConnection and a new
          Producer and continue with your production of JMS Messages.
          -sunny

Who takes care of load balancing work in weblogic cluster ?

Hi Folks,
How load balancing is handled internally by weblogic cluster ? Does Admin server takes care of cluster load balancing ? According to me Admin has nothing to do with load balancing in cluster . Manage server continue to run even when Admin server is down.
I am not looking for explanation about different load balancing algorithm. I am interested in who executes those algorithms in weblogic cluster and how .
Cheers
B.

Hi,
You need to configure loadbalancer and there are different ways to do this. Please go through the below thread to user Apache Loadbalancer.
problem with Apache Proxy plugin
Regards
Suresh.

Question Cluster/Load balancing

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