Load Balance Between Diff DB's or Instances??

Hello All,
Based on the below TNS entry, my understanding is that since it has multiple listener addresses by default connect time failover is configured and as description says load balancing option is also enabled.
But how would i know whether fail over & load balancing is happening to the same instance of database or altogether to a different database??.... I did nslookup on the server names though IP addresses are different it's still not clear for me....
How different are the Oracle instance & Oracle DB??
Could you please shed some light for me to cross check, Thank you.
BDCD =
(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = xxx-vip.abc.com)(PORT = 1557))
    (ADDRESS = (PROTOCOL = TCP)(HOST = yyy-vip.abc.com)(PORT = 1557))
    (LOAD_BALANCE = yes)
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = BDCD)
)

Ariean wrote:
1.) Thanks for your reply, so load balancing and/or fail over will only happen between different instances of the single database or can it also be possible between 2 different databases provided the databases are in sync??
Yes, it can be done between two databases as well and this is called Standby database configuration. This won't do the load balancing for you but you would get teh switchover (or Failover) between two.
2.) Would it be possible to have PROD & DR database servers with load/fail over options configured and also with dataguard setup between those 2 DB's will have same IP addresses & host names like below?
PROD      DataBase Server     tsjipud186.xyz.mq.abcd.net     123.45.67.30
                     tsjipud187.xyz.mq.abcd.net     123.45.67.55
DR     DataBase Server          tsjipud186.xyz.mq.abcd.net     123.45.67.30
                    tsjipud187.xyz.mq.abcd.net     123.45.67.55
Hmm may be I need a cup of coffee because not able to parse the question.
Aman....

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Hi,
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Hi Victor/Jim/Volker,
Thanks a lot for all the responses..
Just wanted to let you guys know that my installation finished successfully.
The thing which confused me was that my Qtime, Qdate and everything else was showing correct values..
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Question about load balancing between Portal and ABAP

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Load balancing between two routers

I have two routers connected through the LAN connection. The first one is using as routing protocol EIGRP, the other one is part of the managed service and I do not have access to it. I would like to make a load balancing between the two of them by redistributing the static routes in EIGRP. When I tried this, I am loosing the EIGRP entry for this route in the routing table. I would like to have both of them , so we could have traffic sharing. I appreciate if you give me any hints.

Raju,
you have two choices as far as I can see. If you want to use static routing over the WAN to your branch, you could duplicate your static routes to the branch and point them to the secondary router. You will have two identical sets of static routes in the primary router, one set pointing to the WAN interface and the other one pointing to the secondary router.
ip route x.x.x.x "WAN-interface"
ip route x.x.x.x "secondary router"
ip route y.y.y.y "WAN-interface"
ip route y.y.y.y "secondary router"
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The other choice would be to use EIGRP over the WAN, and make sure the two routers become EIGRP neighbors. Then you can use the "variance" command to achieve unequal cost load-balancing between the two routers. Let me know if you need more information about this, but i think static routes will be sufficient in your situation.
HTH, Thomas

Round robin DNS for load balancing between multiple network adapters (Xserve)

I'm attempting to use 'round robin' DNS to load balance between the two ethernet adapters of an Xserve.
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The DNS zone for the server's local domain/host (macserver.private) has a machine record with both IP addresses (set up in the Lion Server UI).
Having read up on round robin DNS, I would have expected DNS requests for 'macserver.private' to be answered with the two IP addresses ordered at random, achiving my aim of requests being served at random via each ethernet adapter.
However this doesn't seem to be the case. Doing a 'nslookup' from any of the network clients results in the two IP addresses being listed in the same order everytime. And pinging 'macserver.private' only ever results in a response from the same address.
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Be careful what you wish for
Round Robin DNS is rarely the best option for 'load balancing'. At the very least it's subject to caching at various point on the network - even at the client side, once the client looks up the address it will cache that response - this means that subsequent lookups may be served from the client's cache and not refer back to the server. Therfore any given client will always see the same address until the cache expires.
I suspect this is what you're seeing.
You can minimize this by setting a lower TTL on the records. This should result in the response being cached for a shorter period, meaning the client will make more requests to the server, with a higher change of using the 'other' address.
However, you're also going to run into issues with the server having two interfaces/addresses in the same LAN. This isn't recommended.
As Jonathon mentioned, you may be better off just bonding the two interfaces. This will provide an automatic level of dynamic load balancing without the latency of DNS caches, as well as automatic failover should one link fail (as opposed to round robin DNS which will cause 50% of requests to fail until the client cache expires and a new lookup is performed (and, even then, there's still a chance the client will try to use the failed link).

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Hi, we have two foreign controllers (one active, one standby) and two anchor controllers. All APs are connected to the active foreign controller. The layer 3 networks for the wlan clients on both anchors are different for the same SSID. SSID: Internet, anchor 1: Subnet A, anchor 2: Subnet B. So when a client is getting anchored to Anchor 1, the clients will get an ip from subnet A and when the client is getting anchored to anchor 2, the client will get an ip from subnet B.
This is so far not a big problem because we only have a few accesspoints in some rooms. But what will happen, when we have a full covered wlan and the client roams from one AP to the other AP? Is there a possibility, that the client will anchored to a different anchor while roaming? I think this will result in a lack of connectivity because without a real disconnect the client will not ask for a new IP address.
Other question: Is it possible to disable this load-balancing between anchor controllers? Or can i make a client sticky to only one anchor as long as an access-session is established?
All controllers are 5760 with 3.3.3 software.

Hi acontes,
It's an interesting question.
In this case, if all AP's are on WLC-A and there is no possibility that an L3 inter-subnet roam will occur between WLC-A and WLC-B, I would just forward WLC-A to Anchor A and WLC-B (in the event of fail over) to Anchor B (if Anchors reside on different subnets). If you must specify Anchor A and Anchor B on each WLC for redundancy purposes, it's important to understand the guidelines and limitations with regard to Foreign / Anchor Design.
As Scott mentioned, the limitation with Anchoring design is that there is no primary / secondary configuration for an Anchor on the Foreign WLC.
If WLC-A has two entries (1) for Anchor-A and (2) for Anchor-B, the EoIP tunnels are establish and load-balancing occurs in a round robin fashion.
Keep in mind the following with regard to guest N+1 redundancy:
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•Wireless clients that are associated with an anchor WLC that becomes unreachable are re-associated with another anchor defined for the WLAN. When this happens, assuming web authentication is being used, the client is redirected to the web portal authentication page and required to re-submit their credentials.
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1) What happens if my clients roam?
Nothing... since all AP's are on WLC-A, it's Intra-Controller Roaming
Each controller supports same-controller client roaming across access points managed by the same controller. This roaming is transparent to the client as the session is sustained, and the client continues using the same DHCP-assigned or client-assigned IP address. The controller provides DHCP functionality with a relay function. Same-controller roaming is supported in single-controller deployments and in multiple-controller deployments.
Would it be better to choose the same DHCP Pool on both anchors?
It's probably better to have redundant anchors on the same subnet, but it's not required.
3) How would you design this :-)
WLC-A <--EoIP--> Anchor A (DHCP Pool A)
WLC-A <--EoIP--> Anchor B (DHCP Pool A)
It's important to remeber what Scott mentioned about the lack of a primary / secondary relationship. If multiple controllers are added as mobility anchors for a particular WLAN on a foreign controller, the foreign controller internally sorts the controller by their IP address. The controller with the lowest IP address is the first anchor. For example, a typical ordered list would be 172.16.7.25, and 172.16.7.28. If the first client associates to the foreign controller's anchored WLAN, the client database entry is sent to the first anchor controller in the list, the second client is sent to the second controller in the list, and so on, until the end of the anchor list is reached. The process is repeated starting with the first anchor controller.
If any of the anchor controller is detected to be down, all the clients anchored to the controller are deauthenticated, and the clients then go through the authentication/anchoring process again in a round-robin manner with the remaining controller in the anchor list. This functionality is also extended to regular mobility clients through mobility failover. This feature enables mobility group members to detect failed members and reroute clients.

Distributed Queue - Unable To Load Balance Between Each Time A Send Method Is Called

Hi,
          According to the JMS documentation, I should be able to get the
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          between each time the message producer calls Message.send(). I was not
          able to achieve this, however,
          I noticed the load balancing happens when a JMS client is stopped and
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          exit the JVM and restart the JVM).
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          WLS 8.1 SP2 on XP
          One cluster with two nodes (running on the same machine w/ different port)
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          Any hints and ideas would greatly appreciated.
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          ========================================================================
          <?xml version="1.0" encoding="UTF-8"?>
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          <JMSDistributedQueue JNDIName="com.neoforma.odhDistributedQueue_1"
          LoadBalancingPolicy="Round-Robin" Name="odhDistributedQueue_1"
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          <JMSDistributedQueueMember JMSQueue="odhQueue_2"
          Name="DistributedQueueMember_2"/>
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          <JMSJDBCStore ConnectionPool="odhMessagePool"
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          <JMSJDBCStore ConnectionPool="odhMessagePool"
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          <JMSServer Name="odhJMSServer_1" Store="odhJMSJDBCStore_1"
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          JNDIName="com.neoforma.odhQueue_2" Name="odhQueue_2"
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          DriverName="oracle.jdbc.xa.client.OracleXADataSource"
          Name="odhConnectionPool" Password="...."
          Properties="user=..." Targets="odhCluster_1"
          TestTableName="SQL SELECT 1 FROM DUAL" URL="................."/>
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          Name="odhMessagePool" Password="....."
          Properties="user=....." Targets="odhCluster_1"
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          StagedTargets="odhManagedServer_1,odhManagedServer_2"
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          <EJBComponent Name="odh.jar" Targets="odhCluster_1" URI="odh.jar"/>
          </Application>
          <StartupClass ClassName="com.neoforma.startup.JMXMBeanStartup"
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          Notes="ODH MBean Startup Class - Note" Targets="odhAdmin"/>
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          Credential="{3DES}YFY55/dsdxI9HL/AKGRXHuR1VwyJewNFdAHdrtk/WMM="
          Name="odh"/>
          <SecurityConfiguration
          Credential="{3DES}ZCPa1Bsrj3z2DhVKVUbq32zTYipDVff+LDB9+1b2Dr4VLhz5yjZyHgPheqS/kum4VVZamDYN07Hyb6rALiCTHhwt1EzK5+M+"
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Thanks for the Makiey. I am surprise that BEA hasn't come back with any
          info.
          Hien
          On 7 Jul 2004 01:51:01 -0700, makiey <[email protected]> wrote:
          >
          > Hi Hien Luu,
          >
          > We also have a problem with load balancing, tested with WLS 7.0 SP4 and
          > WLS 8.1
          > SP2 (HP UX). The only "working" configuration is load-balancing policy =
          > random
          > (CF deployed to cluster, load balancing enabled, affinity disabled).
          > With the
          > "round-robin" policy we cannot utilize more than 50% dis. queue's
          > members.
          >
          > I'm trying to prepare a reproducer...
          >
          > greetings,
          > makiey
          >
          >
          > "Hien Luu" <[email protected]> wrote:
          >> Hi,
          >>
          >> According to the JMS documentation, I should be able to get the =
          >>
          >> distributed queue to load balance
          >> between each time the message producer calls Message.send(). I was not
          >> =
          >> =
          >>
          >> able to achieve this, however,
          >> I noticed the load balancing happens when a JMS client is stopped and
          >> =
          >>
          >> restarted (meaning totally
          >> exit the JVM and restart the JVM).
          >>
          >> Here is my configuration:
          >>
          >> WLS 8.1 SP2 on XP
          >> One cluster with two nodes (running on the same machine w/ different
          >> por=
          >> t)
          >> Each node hosts one JMS server, which hosts one physical queue and
          >> using=
          >> =
          >>
          >> JDBC store
          >> One distributed queue with two physical members from each of the JMS
          >> =
          >>
          >> server.
          >> JMS Connection Factory is configured with "Load Balancing Enabled" set
          >> t=
          >> o =
          >>
          >> yes,
          >> and "Server Affinity Enabled" to no. This connection factory is target
          >> =
          >> to =
          >>
          >> the cluster.
          >>
          >> The queue session for the queue sender is created with transaction
          >> setti=
          >> ng =
          >>
          >> to false.
          >>
          >> Any hints and ideas would greatly appreciated.
          >>
          >>
          >> Here is the content of config.xml:
          >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
          >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
          >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
          >>
          >> <?xml version=3D"1.0" encoding=3D"UTF-8"?>
          >> <Domain ConfigurationVersion=3D"8.1.0.0" Name=3D"odh">
          >> <Cluster ClusterAddress=3D"localhost:8001,localhost:9001"
          >> MulticastAddress=3D"237.0.0.1" Name=3D"odhCluster_1"/>
          >> <Server ListenAddress=3D"" ListenPort=3D"7001" Machine=3D"localhost=
          >> "
          >> Name=3D"odhAdmin" NativeIOEnabled=3D"true" ServerVersion=3D"8.1=
          >> .2.0">
          >> <SSL Enabled=3D"false" HostnameVerificationIgnored=3D"false"
          >> IdentityAndTrustLocations=3D"KeyStores" Name=3D"odhAdmin"/>=
          >>
          >> </Server>
          >> <Server Cluster=3D"odhCluster_1" ExpectedToRun=3D"false"
          >> IIOPEnabled=3D"false" ListenAddress=3D"" ListenPort=3D"8001"
          >> Machine=3D"localhost" Name=3D"odhManagedServer_1"
          >> NativeIOEnabled=3D"true" ServerVersion=3D"8.1.2.0">
          >> <SSL Enabled=3D"false" IdentityAndTrustLocations=3D"KeyStores"
          >> =
          >> =
          >>
          >> Name=3D"odhManagedServer_1"/>
          >> <ExecuteQueue Name=3D"weblogic.kernel.Default" ThreadCount=3D"1=
          >> 5"/>
          >> </Server>
          >> <Server Cluster=3D"odhCluster_1" ExpectedToRun=3D"false"
          >> IIOPEnabled=3D"false" ListenAddress=3D"" ListenPort=3D"9001"
          >> Machine=3D"localhost" Name=3D"odhManagedServer_2"
          >> NativeIOEnabled=3D"true" ServerVersion=3D"8.1.2.0">
          >> <SSL Enabled=3D"false" IdentityAndTrustLocations=3D"KeyStores"
          >> =
          >> =
          >>
          >> Name=3D"odhManagedServer_2"/>
          >> <ExecuteQueue Name=3D"weblogic.kernel.Default" ThreadCount=3D"1=
          >> 5"/>
          >> </Server>
          >> <MigratableTarget Cluster=3D"odhCluster_1"
          >> Name=3D"odhManagedServer_1 (migratable)"
          >> Notes=3D"This is a system generated default migratable target
          >> f=
          >> or a =
          >>
          >> server. Do not delete manually."
          >> UserPreferredServer=3D"odhManagedServer_1"/>
          >> <MigratableTarget Cluster=3D"odhCluster_1"
          >> Name=3D"odhManagedServer_2 (migratable)"
          >> Notes=3D"This is a system generated default migratable target
          >> f=
          >> or a =
          >>
          >> server. Do not delete manually."
          >> UserPreferredServer=3D"odhManagedServer_2"/>
          >> <Machine Name=3D"localhost">
          >> <NodeManager ListenAddress=3D"localhost" Name=3D"localhost"/>
          >> </Machine>
          >> <JMSConnectionFactory AcknowledgePolicy=3D"All"
          >> DefaultDeliveryMode=3D"Persistent"
          >> JNDIName=3D"com.neoforma.ConnectionFactory"
          >> Name=3D"odhConnectionFactory" ServerAffinityEnabled=3D"false"
          >> Targets=3D"odhCluster_1" XAConnectionFactoryEnabled=3D"true"/>
          >> <JMSDistributedQueue JNDIName=3D"com.neoforma.odhDistributedQueue_1=
          >> "
          >> LoadBalancingPolicy=3D"Round-Robin" Name=3D"odhDistributedQueue=
          >> _1" =
          >>
          >> Targets=3D"odhCluster_1">
          >> <JMSDistributedQueueMember JMSQueue=3D"odhQueue_1" =
          >>
          >> Name=3D"DistributedQueueMember_1"/>
          >> <JMSDistributedQueueMember JMSQueue=3D"odhQueue_2" =
          >>
          >> Name=3D"DistributedQueueMember_2"/>
          >> </JMSDistributedQueue>
          >> <JMSJDBCStore ConnectionPool=3D"odhMessagePool"
          >> Name=3D"odhJMSJDBCStore_1" PrefixName=3D"Order1_"/>
          >> <JMSJDBCStore ConnectionPool=3D"odhMessagePool"
          >> Name=3D"odhJMSJDBCStore_2" PrefixName=3D"Order2_"/>
          >> <JMSServer Name=3D"odhJMSServer_1" Store=3D"odhJMSJDBCStore_1"
          >> =
          >>
          >> Targets=3D"odhManagedServer_1">
          >> <JMSQueue CreationTime=3D"1076439896999"
          >> JNDIName=3D"com.neoforma.odhQueue_1" Name=3D"odhQueue_1"
          >> =
          >>
          >> StoreEnabled=3D"true"/>
          >> </JMSServer>
          >> <JMSServer Name=3D"odhJMSServer_2" Store=3D"odhJMSJDBCStore_2"
          >> =
          >>
          >> Targets=3D"odhManagedServer_2">
          >> <JMSQueue CreationTime=3D"1076439664343"
          >> JNDIName=3D"com.neoforma.odhQueue_2" Name=3D"odhQueue_2"
          >> =
          >>
          >> StoreEnabled=3D"true"/>
          >> </JMSServer>
          >> <JDBCConnectionPool
          >> DriverName=3D"oracle.jdbc.xa.client.OracleXADataSource"
          >> Name=3D"odhConnectionPool" Password=3D"...."
          >> Properties=3D"user=3D..." Targets=3D"odhCluster_1"
          >> TestTableName=3D"SQL SELECT 1 FROM DUAL" URL=3D"...............=
          >> .."/>
          >> <JDBCConnectionPool DriverName=3D"oracle.jdbc.driver.OracleDriver"
          >> Name=3D"odhMessagePool" Password=3D"....."
          >> Properties=3D"user=3D....." Targets=3D"odhCluster_1"
          >> TestTableName=3D"SQL SELECT 1 FROM DUAL" URL=3D"............."/=
          >>>
          >> <JDBCMultiPool AlgorithmType=3D"High-Availability"
          >> Name=3D"odhJDBCMultiPool_1"
          >> PoolList=3D"odhConnectionPool,odhMessagePool" =
          >>
          >> Targets=3D"odhCluster_1"/>
          >> <JDBCTxDataSource EnableTwoPhaseCommit=3D"false"
          >> JNDIName=3D"com.neoforma.order.orderDS" Name=3D"odhJDBCDataSour=
          >> ce_1"
          >> PoolName=3D"odhConnectionPool" Targets=3D"odhCluster_1"/>
          >> <Security Name=3D"odh" PasswordPolicy=3D"wl_default_password_policy=
          >> "
          >> Realm=3D"wl_default_realm" RealmSetup=3D"true"/>
          >> 
          >> <Realm FileRealm=3D"wl_default_file_realm" Name=3D"wl_default_realm=
          >> "/>
          >> <FileRealm Name=3D"wl_default_file_realm"/>
          >> <PasswordPolicy Name=3D"wl_default_password_policy"/>
          >> <Application Deployed=3D"true" Name=3D"odh.ear"
          >> Path=3D"D:\bea\user_projects\domains\odh\applications\odh.ear"
          >> StagedTargets=3D"odhManagedServer_1,odhManagedServer_2"
          >> StagingMode=3D"stage" TwoPhase=3D"true">
          >> <EJBComponent Name=3D"odh.jar" Targets=3D"odhCluster_1" URI=3D"=
          >> odh.jar"/>
          >> </Application>
          >> <StartupClass ClassName=3D"com.neoforma.startup.JMXMBeanStartup"
          >> DeploymentOrder=3D"1" Name=3D"ODH MBean Startup Class"
          >> Notes=3D"ODH MBean Startup Class - Note" Targets=3D"odhAdmin"/>=
          >>
          >> <EmbeddedLDAP
          >> Credential=3D"{3DES}YFY55/dsdxI9HL/AKGRXHuR1VwyJewNFdAHdrtk/WMM=
          >> =3D" =
          >>
          >> Name=3D"odh"/>
          >> <SecurityConfiguration
          >> Credential=3D"{3DES}ZCPa1Bsrj3z2DhVKVUbq32zTYipDVff+LDB9+1b2Dr4=
          >> VLhz5yjZyHgPheqS/kum4VVZamDYN07Hyb6rALiCTHhwt1EzK5+M+"
          >> Name=3D"odh" RealmBootStrapVersion=3D"1"/>
          >> </Domain>
          >
          Using Opera's revolutionary e-mail client: http://www.opera.com/m2/

Load balancing between two interfaces on 2811

Hi,
We have a 2811 router with VPN and NAT configured. We have two internet connection from different ISPs. The speed of our original connection is 2MB up and down. The speed of our new connection is 1MB up and down. We want to configure load balancing between the two connections. Our new ISP has provided us with a CISCO 837 router. We want to connect that router into our 2811 on one of the free WIC card and then configure load balancing between the two interfaces on our 2811. The third interface has a local address configured. Please suggest where to start. I tried searching on net for any configuration example but I was unable to find any particular example with commands. I am new on CISCO platform. Any help will be hugely appreciated. Thanks in advance.

Raju,
you have two choices as far as I can see. If you want to use static routing over the WAN to your branch, you could duplicate your static routes to the branch and point them to the secondary router. You will have two identical sets of static routes in the primary router, one set pointing to the WAN interface and the other one pointing to the secondary router.
ip route x.x.x.x "WAN-interface"
ip route x.x.x.x "secondary router"
ip route y.y.y.y "WAN-interface"
ip route y.y.y.y "secondary router"
etc.
As a result the primary router will have two routes to the branch and will load-balance. If one next-hop fails (either the WAN interface or the secondary router), only the other will be used. If the next-hop comes back up, load-balancing will resume.
The other choice would be to use EIGRP over the WAN, and make sure the two routers become EIGRP neighbors. Then you can use the "variance" command to achieve unequal cost load-balancing between the two routers. Let me know if you need more information about this, but i think static routes will be sufficient in your situation.
HTH, Thomas

Load balancing HTTP requests for an OC4J instance w/multiple JVMs

Hello everyone,
I am using OAS 10.1.3.1 and wish to load balance HTTP requests across an OC4J group of one or more OC4J instances, where each like named OC4J instance may have multiple JVMs or it may just have one JVM.
My mod_oc4j.conf file would contain the following directives :
Oc4jSelectMethod roundrobin:local
Oc4jRoutingMode Static
Oc4JMount /xyz/* xyz
In the degenerate case, I would like to have an OC4J group with a cluster size of one, and have that one OC4J instance have two or more JVMs. I would like to be able to receive a request within my web application, determine that the JVM that has been sent the request is the wrong JVM to process the request, and then call HttpServletResponse.sendRedirect("/xyz"). Then, when the browser receives the HTTP 302 response and issues the subsequent HTTP request, have that request sent to a different JVM than the previous JVM that issued the sendRedirect().
What I have seen is that the subsequent request is sent back to the same JVM that issued the sendRedirect(). I also call invalidate() against the HttpSession prior to calling sendRedirect(), but that does not seem to affect the behavior that I see.
In the full blown case, I would have an OC4J group with a cluster size > 1, and each of those OC4J instances would have at least one JVM. In that case, I wish the sendRedirect() call to allow the subsequent request to be sent to any one of the OC4J instances in the group, and any one of those JVMs within all of those OC4J instances.
Can anyone verify that my mod_oc4j mount directive is appropriate given the select method and routing mode? What else might I need to do to have a chance to have a different JVM respond to the request that results from a sendRedirect()?
Thank you,
Doug

I should clarify that in the full blown environment, the OC4J instances that form a group will each be housed within a separate OAS instance that resides on its own machine.
So ideally, a request could be inbound to say OAS instance 1 on machine A, OC4J instance AA, JVM 2, and I need to force a redirect so that the request can actually be serviced by OAS instance 3 on machine C, OC4J instance AA, JVM 1, and I need to be able to call sendRedirect() against an HttpServletResponse from within a JVM until the subsequent request from the browser, Internet Explorer in my case, is serviced by that JVM.
Thanks,
Doug

Is there auto load balance between 2 active webi services?

Hi ,
I have not seen any kind documentation from SAP whether BOBJ can auto load balance requests in round robin fashion between 2 or more webi services.
The only theory or belief that i see & hear is that upon reaching the max connection threshold of one webi service, bobj will start diverting the next requests to second webi service.
So now i am looking for some kind of clarification on whether auto load balance happens between multiple webi services in round robin fashion or not.
Please share if any one has idea about this.
Thanks,
Srikar

Thanks to everyone who tried to respond to my question.
But i just got below response from SAP:
=====================================================
I would like to inform you that CMS distributes the load (jobs) to
servers according to the server availability (maximum jobs allocated
to individual server). This is a generally how load is balanced
between CMS and various job servers and processing servers.
=====================================================
Now i am more confused. I personally did some little testing by creating 2 webi services and tried to view multiple webi reports. What i observed is it does pick up different webi services only while at the start of report viewing. But once it picks up perticualr webi service, that same user session is sticking to previously picked up webi service and always goes to the same process for processing.
But now SAP response is bit more confusing.
Thanks,
Srikar

How to properly load balance between diffrent server farms.

Hi experts,
We are using an ACE 4710. We chose for our server farms to load balance using the least_connections predictor. it seems to work fine inside the same server farm but is it working properly between server farms? It doesn't seem because some of my real servers seems to be more loaded than others. Each server farm are using the same real servers.
Any idea about what is the problem or any suggestion regarding the best load balancing predictor we should use using this kind of configuration?
Thank's to all.

The ACE uses load-balancing algorithms or predictors to determine how to balance the traffic among the devices configured in the server farms, independent of the device type. For FWLB, we recommend that you use only the hash address source and the hash address destination predictors. Using any other predictor with FWLB may fail and block traffic, especially for applications that have separate control and data channels.
Here is the configuration guide for the Cisco ACE 4700 Series Appliance Server Load-Balancing.
http://www.cisco.com/en/US/docs/app_ntwk_services/data_center_app_services/ace_appliances/vA1_7_/configuration/slb/guide/fwldbal.html

Load balance between DLSw and CIP routers

Take a look on this environment:
- 4 routers receiving all DLSw peers and circuits
- 4 routers with CIP boards connected to 2 mainframes
All CIP routers are configured with same MAC address. All routers (DLSw and CIP) are connected on a Ethernet LAN switching, so this traffic are pure LLC2.
How I can balance the traffic between DLSw and CIP routers ?
Thank's in advance.

I am not sure if I totally understand the topology. Let me rephrase it. Please correct me if I misunderstand the topology. In a data centre, there are 4 DLSw routers terminating DLSw peer connections from the remote sites. In the same data centre, there are 4 CIP routers which connects to 2 mainframes. CSNA is configured on all CIP router, which uses the same MAC. You configure transparent bridging on the DLSw routers, which connect to the same ethernet switches as the CIP routers. You configure SR/TLB on the CIP routers; so that all LLC2 circuits coming from the DLSw routers connect through the ethernet interfaces of the CIP routers.
Do you want the LLC2 circuits from a DLSw router load balance across 4 CIP routers? As duplicate MAC address is not allowed, there is no way to connect all 4 DLSw routers and CIP 4 routers on the same VLAN.
I can think of a couple of workarounds.
1. Enable SNASw on the 4 DLSw routers. Create a VDLC port on all 4 DLSw routers. The MAC address of the VDLC interface is the same. The VDLC MAC address is pointed by the remote SNA stations. Each DLSw router uses one of the CIP routers as DLUS.
2. If this is the case, create 4 VLANs on the ethernet switches. Connect a pair of DLSw router and CIP router to each VLAN.

2 locations, 2 core switch stacks, fibre in between, equal cost load balancing between?

Hi,
We've recently inherited a job that another company was doing, so we've had our hand slightly forced on the kit and overall topology involved, however that's all fine and we can make it work.
This is a collapsed core topology with core and access switches, split over 3 blocks (fibre connections between), one core switch/stack is in block B and the other in block C, with access switches throughout.
They require all access switches to be connected to the Core in B and the Core in C, and then obviously cross connects between the two cores.
They state:
"Core switches shall be linked with 2x 1Gbps links bonded into a standard compliant Etherchannel"
"Uplinks between access and core switches shall be non-blocking - for example equal cost load balancing at layer 3, or layer 2 bonded multi-chassis Etherchannel"
The specced kit for the core are 3850's, in an ideal world I'd use VSS (Virtual Switch System) to achieve the above statements beyond repute; but this is only supported on 4500/6500 and Nexus platforms.
Do we think a cross stack etherchannel (LACP between both core switch stacks) would satisfy the above statements? Or the statements may just be badly worded...
I look forward to your thoughts and views on this! Thanks!

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Posting
As the others have noted, the 3850s, to stack, are restricted to the length of the longest stack cables.
As you have noted, VSS physical units would allow the "logical" unit to be far apart.
For a "small" VSS core, the 4500-X might be an idea unit. (Other than cost, the 4500 would be a better choice for a core device.)
Something to watch for, or understand, when running VSS, Etherchannel doesn't load balance as it does on a single chassis or stack. VSS will avoid using the VSL cross link unless it must.
As many access switches, today, support basic L3 routing, you might also determine whether a L3 edge would be a suitable alternative choice. It would allow retention of the 3850s and can offer some advantages even over VSS. (Where VSS is very nice [as too the Nexus] supporting servers with Etherchannels.)

Round-robin Load balancing doesn't work after one instance reboot

Hi,
          We have two weblogic instances in a cluster. All Http requests are routed through the plug-in for load-balancing(round-robin). One instance in a cluster is shutdown for production maintenance. Now all requests are being forwarded to the second instance. When the first instance is started, only the new users are forwarded to the first instance. The requests from users already logged in are not forwarded to the first instance. Due to this the second instance is over-loaded.
          How to prevent this and make weblogic to distribute the load even after the server restart? This is a production problem and I highly appreciate your responses.
          Thanks,
          Prasad Dantuluri

it worked when I removed the value entered in the "Unicast Broadcast Channel" and restarted the cluster. Don't know what is supposed to go in that field but hey.

Load Balance Between Diff DB's or Instances??

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