Some confusion about Web Cache clustering for load balancing

I have 4 Windows 2003 identical machines having OAS 10g installed with Web Cache (Same Passwords and Oracle Home) . I want to utilize them for load-balancing using Microsoft Network Load-balancing. I followed the Note: 259208.1 till step#10. Now we have virtual machine "IASPROD" for all other nodes {IASPROD1,IASPROD2,IASPROD3,IASPROD4 } I am able to logon to Web Cache manager from all nodes separately.
On Node-1 I added all nodes entries in " Origin Server " having routed "Enabled " for all of them. Same I did added in Site-Definitions and gave alias hostname as "IASPROD" which is virtual server.
Priority =1
Site Hostname =iasprod1.domain Port = 80
Policy = Unrestricted
Origin Server Hostnames , port,proxy
iasprod1.domain 7778 No
iasprod2.domain 7778 No
iasprod3.domain 7778 No
iasprod4.domain 7778 No
I have couple of questions might be very basic but as I am configuring very first time.
1. How do I access all the machines through virtual name as stated above ? I tried but not working.
2. This cluster setup should be repeated for all Nodes or for only node-1.
3. If for only Node-1 than what will heppen in case of Node-1 goes down.
4. How can I verify Load-balancing is working ?
If you guyz can guide me than I'll be very greatful.

One more addition Database is on AIX (9.2.0.4)

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Session Binding on Web Cache acting as load balancer

Hi gurus,
I have Web Cache 10.1.2 acting as load balancer on the front-end machine, and two OracleAS 10.1.2 enterprise edition installations behind it. The load balancing configuration is done and is working well. The Web Cache (acting as load balancer) routes requests the to the two OracleAS installations very well.
Now I need to set up session binding, so that a request from the same client is directed to the same OracleAS installation (in the same session). I am really a novice on session binding - could you pl let me know what I need to do?
Going through the Web cache admin guide, I did try to use JSESSIONID but without much success. Specific Qs:
1. Do I need to enable session binding at only the back-end OracleAS installations, or also at the front-end Web Cache (acting as load balancer).
2. If I use JSESSIONID - is it generated by Web Cache / HTTP Server automatically, or do I need to write a J2EE application to generate it?
Thanks a lot in advance.
Navneet.

hi,,,
i neesd some help in ur issue,
i face a problem woth web cache in Load balancing ,, it is not working...
my case is same to ur case, BUT i have AS10g ( 9.0.4 )
and i got this err
"FRM-92101: There was a failure in the forms server during startup.
This could happen due to invalid configuration.
Please look in the web-server log file for details."
i followed metalink notes and configration. and Configuring Oracle HTTP Server by modifying the httpd.conf file.
- CookieTracking On
- and CookieName xxxxxxx
and still the same prob ...
could u help me plz.
and is it because my AS version which is 10g(9.0.4) ?
this is my emil : [email protected]

To get some idea about central instance, dialog instance, load balancer etc

Hi,
I want to get some idea about central instance, dialog instance, load balancer, cluster nodes etc.
can any one help with some links or blogs or docs.
Thanks
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Hi jhansi
Follow this pdf this will answer all your questions
http://help.sap.com/search/highlightContent.jsp
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Clustering for load balancing only

I wish to set up 2 WLS 8.1 machines to run an application independently to
          share load (no replication of sessions, beans etc).
          Can I create a cluster for the two servers and not turn on any session or
          bean replication, then configure the IIS or Apache plug-in to use the
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          Chris


Chris,
          Yes you can certainly use a Cluster simply for load balancing. There is no
          mandate that you have to take advantage of session state replication in the
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          ~Ryan Upton
          "Chris Steains" <[email protected]> wrote in message
          news:[email protected]..
          > I wish to set up 2 WLS 8.1 machines to run an application independently to
          > share load (no replication of sessions, beans etc).
          >
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WebAS access via Portal: Web Dispatcher required for load balancing ABAP

Hi Folks -
We have EP 6.0 SP18 (Java only, WebAS 6.40, Unix/Solaris). The portal has a CI/SCS and one DI so we have a Web Dispatcher to load balance the portal servers. This works fine (and provides port 80 access).
This portal will provide access to HTTP services from an ABAP WebAS (6.20 with 6.40 kernel, Unix/Solaris). A landscape configuration entry has been added to the portal for this ABAP system. The ABAP system has a CI and multiple app servers, all capable of handling HTTP requests. This will also require port 80 access.
1. Will we need an additional Web Dispatcher to load balance HTTP requests to the 'backend' ABAP WebAS system, or will the portal be smart enough to handle the load balancing itself (perhaps based on the information in the landscape configuration)?
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3. Are there any changes to this with NW2004s Portal (we plan to upgrade soon)?
Thanks in advance! Jeff

Jeff,
Regarding:
Q1. If you create a system object from the "SAP system with load balancing" template in portal and configure the object to point to your CI (msg server), the LB should be handled.
Q2. Portal load balancing is handled by the message server. If you point a test URL to the port of your message server, you will notice that you are issued a redirect the URL of your dialog instance. The web dispatcher is just a proxy (with some intelligence). When a request is made to the WD, it makes a connection to the MSG server, the list of active instances is queried, a redirect is made to that instanct. If you use WD, that connection can be proxied behind a standard URL. If you connect directly to the MSG Server instead, you will notice your URL change, just as it does on the service marketplace.
WDs are good for providing services, masked (proxied) behind virtual names. If you do not want the customer to see a physical URL of the server, use the WD. There are lots of other solutions that can do this too though such as Apache, ISA, Juniper devices, Cisco LDs. WDs have a very low performance threshold though, especially if you use SSL. WD is a performance bottleneck and should be benchmarked to see if it is right for your application.
Q3. No changes this architecture in 04s.
jwise

SSP5: Using multiple JVM for load balance performance?

Sun 12 MAY 2002
Apps 11.0.3
SSP5 patchset I
HP UX 11.0
db 8.1.7.2 (64-bit)
Load 60 concurrent sessions, each spawning 2.5 - 3 http connections.
CPU 3:750Mhz
RAM 8G
Is anybody using multiple JVM for load balance?
What is your ratio of JVM to concurrent iP sessions?
Are you running Apache/Jserv on a server with any other applications, or is Apache by itself?
If you are not using JVM, how many httpd processes do you get before Apache implodes? We stopped in the water at 90 httpd processes, but performance degraded starting at 70 sessions.
Thx - Don

Using Web Cache to load balance servlet-based Forms (6i and 9i) is unofficially supported. I say "unofficially" because we have actual customers doing it and getting support, but the 2 development teams (Forms and Web Cache) haven't actually done any integration testing of this sort of configuration yet. For your case, please contact your Support rep and ask what was done to use Web Cache as a load balancer for Forms6i at METRO in Germany. The Forms product managemment team is writing up a white paper to describe how to do it, but until then, you'll need to go through Support. Please contact me if you want more information.

Some confusion about 3D TV's and Syncing Glasses

There has been some confusion about our ad from last week and the offer to sync the 3D glasses with your TV.
We by no means intend to confuse our customers or offer fraudulent services. The offer is new to our stores, and our own employees have been in training just this week. Let me clarify the services included with the Samsung 3D TV offer that appears in this weekend’s insert. Geek Squad will:
Set up and connect your TV + up to 5 components.
Add internet connectable components to your existing wireless network.
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Review and teach you how to use all of your new gear.
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Matthew
Community Builder
Best Buy Corporate

Can you give details of how you get to £45 per month?
Phone rental and BB Opt 2 ought not to be more that £32
You can opt for line rental saver NOW and that will seriously reduce your bill.
You can also recontract your BB at anytime and unless you recontracted last May or only got BB last May then you are out BB contract and and can cancel or move or negotiate a deal.
If you are really hard up you could cancel Sky as one senior to another.
Life | 1967 Plus Radio | 1000 Classical Hits | Kafka's World
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CF8/JRun4 Cluster for Load Balancing

Does anyone have an example of how to set up a CF8/JRun4
cluster for load balancing?
I have three servers:
x004 - Linux - Apache2 (10.0.0.54,10.1.0.54)
x020 - Linux - JRun4/CF8 (10.0.0.70,10.1.0.70)
x021 - Linux - JRun4/CF8 (10.0.0.71,10.1.0.71)
Every server in our network has two network cards. One
network card is attached to 10.0.x.x which has a gateway to the
internet and runs at 100Mbps and is firewalled, and the other is
attached to 10.1.x.x which runs at 1Gbps and is internal with no
gateway. I'm trying to set it up so web traffic arrives on
10.0.0.54 into Apache and mod_jrun20 bootstraps a cluster named
STST using 10.1.0.54 which consists of STST_x020 coldfusion server
running on x020 and STST_x021 running on x021. I want the
communications between JRun4 on x020 and x021 to occur on the
10.1.x.x network and eventhough JRun and ColdFusion will only use
the 10.1.x.x network I still need the 10.0.x.x network card
attached for other purposes which require a gateway. I have
installed JRun4/CF8 about 10 times already and it seems I have no
control over what network JRun4 clusters on... sometimes it will
communicate on one, sometimes the other and without being able to
set which network is being used there always seems to be "network
error" on at least one of the two CF8 servers. I was able to get
everything working fine by disabling the network cards on the
10.0.x.x network and re-installing everything... but as soon as I
added the network cards back the whole thing was broken again.
How is this supposed to work? Most of the examples are either
no clustering or clustering on the same machine with Apache running
on the same box... I don't see any clustering across machines
examples.
How do I install a connector on a web server which doesn't
have JRun on it and get wsconfig to connect to a multi-machine
cluster when wsconfig only accepts a single IP address as a host
and the cluster is not listed?
How do I get JRun to bind to a specific network card?
Does this work if I choose a J2EE server other than JRun?
Any help anyone can provide is greatly appreciated. I'm
getting close to giving up which means staying on the non-clustered
environment and figuring out how we can deal with scalability by
switching to something else.

The article at
http://www.adobe.com/go/1e8e9170
is specific to configuring two or more cluster nodes that reside on
separate networks, e.g. 10.0.1.0/24 and 10.0.2.0/24. (The article
doesn't state it, but you can only use unicast peers if your
cluster nodes host a single instance of JRun or multiple instances
of JRun in the same cluster domain. When performing unicast
discovery, JRun looks for all Jini groups and not just the cluster
group.)
Anyhow, that's not your problem. The simplest solution is you
haven't enabled the jrun.servlet.jrpp.JRunProxyService service. I'm
most familiar with the Windows version of JRun, but I'm assuming
the directory structure is similar across platforms. In
<jrun_root>/servers/<name>/SERVER-INF/jrun.xml, set the
deactivated attribute of the jrun.servlet.jrpp.JRunProxyService
service to false and restart JRun. You should now see JRun
listening on the appropriate port. (The default for the first
manually created instance is 51000.) You can limit the proxy
service to a single interface using the interface attribute.
If you have enabled the proxy service, verify your security
settings in <jrun_root>/lib/security.properties. It's usually
best to limit access to specific hosts. Comment out the
jrun.subnet.restriction parameter and set the jrun.trusted.hosts to
the IP address of your web server, e.g. 10.1.0.54.
Forcing all JRun processes/services to listen on a single
interface isn't difficult, but it does require modifying quite a
few configuration files by hand. If you need assistance with that,
I can elaborate.
Configuring the JRun module under Apache is pretty
straightforward. If you're not using virtual hosts, it's very
simple. If you are using virtual hosts, it's still simple, but your
JRun configuration can be virtual host-specific.
On your Apache server, you'll want to create a directory
structure for the JRun module. I'll assume
/opt/jrun/lib/wsconfig/1, but you can use anything you want. Once
the directory structure is created, extract the appropriate JRun
module from wsconfig.jar to the new directory. You're most likely
interested in the Apache 2.0 module,
wsconfig.jar/connectors/apache/intel-linux/prebuilt/mod_jrun20.so.
Let's assume you've extracted the module to
/opt/jrun/lib/wsconfig/1/mod_jrun20.so. Your Apache service account
should have read, write, and execute permissions on the
/opt/jrun/lib/wsconfig/1 directory.
The JRun module configuration is normally appended to your
current httpd.conf file by wsconfig. Here's a sample configuration:
LoadModule jrun_module
"/opt/jrun/lib/wsconfig/1/mod_jrun20.so"
<IfModule mod_jrun20.c>
JRunConfig Verbose false
JRunConfig Apialloc false
JRunConfig Ssl false
JRunConfig Ignoresuffixmap false
JRunConfig Serverstore
"/opt/jrun/lib/wsconfig/1/jrunserver.store"
JRunConfig Bootstrap 10.1.0.70:51000
#JRunConfig Errorurl <optionally redirect to this URL on
errors>
#JRunConfig ProxyRetryInterval 600
#JRunConfig ConnectTimeout 30
#JRunConfig RecvTimeout 30
#JRunConfig SendTimeout 30
AddHandler jrun-handler .jsp .jws .cfm .cfml .cfc .cfr
.cfswf
</IfModule>
You may also want to update your DirectoryIndex directive
with an appropriate index page, e.g. index.cfm.
After the first request to a page handled by the JRun module
is received, the module will query the boostrap server,
10.1.0.70:51000, for a list of cluster peers. If you've configured
your cluster correctly, a line similar to following will be written
to /opt/jrun/lib/wsconfig/1/jrunserver.store:
proxyservers=10.1.0.70:51000;10.1.0.71:51000
You can create/edit this file manually as well.
Unfortunately, the bootstrap option only accepts one server. If
your bootstrap server is down, the JRun module will use the values
in jrunserver.store directly, if the file exists.
Here's a complete list of JRun module options:
metrics *
debugger *
ssl *
verbose
traceflags
serverstore
bootstrap
errorurl
apialloc
ignoresuffixmap
proxyretryinterval
connecttimeout
recvtimeout
sendtimeout
sslcalist
Options flagged with an asterisk can only be configured at
the Apache server level. All other options can be configured at the
server level and/or the virtual host level. The usage of these
options is in the JRun documentation, and the JRun module source
code is included in wsconfig.jar. Keep in mind that versions of the
JRun module shipped prior to ColdFusion 8 were coded to assign the
connecttimeout and sendtimeout options to the socket connection
timeout. Whichever option appeared last in your configuration ended
up as the final value. This has been fixed in ColdFusion 8 and
presumably the next release of the JRun updater.
I think that's a good start. If you need more information or
can't find what you need in the JRun or ColdFusion documentation,
let me know.
If you're looking for resiliency, I highly recommend
expanding your configuration to include a second web server and a
hardware load-balancer (preferably one that supports redudancy via
multiple paths and devices, e.g. devices from Cisco, F5, or Foundry
Networks). Often, however, running Apache on the ColdFusion
server(s) provides adequate performance, and round-robin DNS
records coupled with the ability to update DNS quickly in the event
of a failure may be all you need for load-balancing and
failover.

Want to know about ACE module in 6509 : load-balancing concept

Hi,
I am quite new in this field , where i need to configure and understand the concept of load-balancing through ACE.
In my existing network set-up , i have some application servers as well as some other servers where i am looking for load-balancing.
I have gone through some of the site and cisco site as well and i came across ACE module which can be installed in 6509 switch.
I have 6509 switch as well but before going for installing the ACE module I am keen to understand below things:
1) what is difference between CSM or any other product load-balancer and ACE module :
Gone through site as well , but not getting proper answer or comparison.
1) I have some of the server configured with clustering and getting one virtual IP, In this case , will ACE work ?
2) If suppose i go for configuring different IP address with all server IP :
How do i achieve it ?
3) what is Virtual IP concept in ACE because i do not have and other ACE module then why do i need virtual IP ?
4) will the load-balancing happens based on destination based or session based ?
Please share the knowledge. It would be great help for me to go ahead with ACE and configure it and understand all the application ?

Hello,
1) what is difference between CSM or any other product load-balancer and ACE module :
There are several differences but to say simply, you get higher performance and more features with ACE module/appliance comparing others.
One big difference is that with ACE seriese, you can configure multiple contexts on one box (virtual load-balancers on one box) that makes us possible to provide a virtual load-balancer to a customer. In that way, the customer can access and makes changes on only the virtual box. You can split management domain for each customers. Also using contexts, you can assign certain resources available on the hardware for each contexts according to their service contract.
ACE serise has specific hardware chip for supporting SSL termination but some others do not.
For instance, you need a CSM-S, or a CSM and a SSL module to terminate SSL.
The other thing I should mention is that our most recent product is ACE serise that means it has longer product roadmap.
Let me try clarifying your other questions.
3) what is Virtual IP concept in ACE because i do not have and other ACE module then why do i need virtual IP ?
4) will the load-balancing happens based on destination based or session based ?
I think I'd better to put 3) and 4) first.
Virtual ip address (VIP) is the address to which client accesses.
VIP is tied with a serverfarm or serverfarms, in a serverfarm one or multiple rservers can be configured.
"serverfarm" is a group of "rservers".
"rserver" means real-server that has an ip address and processes transactions.
When a client accesses to the VIP, ACE picks up a rserver according to algorithm.
If you configure a VIP that is tied with a serverfarm where only one rsever is configured, client accesses to the virtual ip address are
all forwarded to the rserver.
If you configure a VIP that is tied with a serverfarm where multiple rsevers are configured, client accesses to the virtual ip address are
balanced among those rservers.
If you configure multiple VIPs, client accesses to those VIPs are forwareded to corresponding rservers according to configuration.
1) I have some of the server configured with clustering and getting one virtual IP, In this case , will ACE work ?
ACE load-balances connections to configured rservers.
If the clustered servers are sharing one virtual ip address and you configure the virtual ip address as a rserver, all connections are
sent to the virtual ip address. That is not "load-balancing" on ACE... You need multiple rservers to which ACE load-balances connections.
2) If suppose i go for configuring different IP address with all server IP :
How do i achieve it ?
You can configure those ip addresses as rserver ip address.
Multiple rservers are tied into a group, "serverfarm".
I'm not certain about your culstered servers but I guess you can configure each ip addresses in the culster as rservers.
Then put those rservers in a serverfarm.Client accesses to a virtual ip address configured on ACE for the serverfarm.
This way connections are load-balanced among those rservers depending on load-balancing algorithm you choose.
Above is just an overveiw. ACE gives you granular control not mentioned above.
I can provide more specific information if you tell me details of what you are trying to archive with ACE.
Regards,
Kimihito.

Cluster Apex MS's across multiple nodes for load balancing?

Can Cluster Apex MS's across multiple nodes for load balancing? If Yes/No, any supportive doc's will be much appreciated.
Here is what I did ..........
I tried multiple MS's on different nodes for Apex Domain (clustered)
Deployed apex.war, i.war with targets pointing to cluster.
Apex listener techstack is shared filesystem $HOME/apex, where apex-config.xml and bdb are available
Anyone of the MS's whichever started up first is locking up bdb and 500 server shows up when internal workspace is being launched with host specific url, where as it works fine for the host which actually locked up bdb (first MS that was started)
2nd MS shows errors as below in log files ..
Caused By: com.sleepycat.je.EnvironmentLockedException: (JE 4.0.103)$HOME/apex/bdb The environment cannot be locked for single writer access. ENV_LOCKED: The je.lck file could not be locked. Environment is invalid and must be closed.
Its expected behavior until here .....
++++ I tried something to get it working ++++
Whilst both MS's are up and running, delete $HOME/apex/bdb but let apex-config,xml be as it is...now the internal workspace urls for both hosts work fine. I logged into host specific urls and navigated, created/edited users.,etc and it is all looking good but it did not create new bdb directory under $HOME/apex ...!!
Having said its working fine, the same issue repeats after the MS's bounce. So I did put a command line to delete bdb dir once the MS comes up to avoid the issue but really not sure if this is the right way at all?
Geek's ...awaiting your advice!!

Hey there,
I managed to fulfill my requirement..
If its a cluster on same machine or across machines, this should work
1. Login to machine, cd $DOMAIN_HOME
2. mkdir -p Apex_lsn_config/AdminServer Apex_lsn_config/<MS1> Apex_lsn_config/<MS2> # MS1 and MS2 are the Managed Server names as appropriate
#If you are planning for cluster spawning MS's across machines, make sure you create the dir's on step 2 for each machine respectively. (in my case $DOMAIN_HOME is not shared)
3. Copy apex-config.xml from the /tmp/apex or whatever location you have it currently to Apex_lsn_config/<MS1> Apex_lsn_config/<MS2>
4. cd $DOMAIN_HOME/bin; cp -p SetDomainEnv.sh SetDomainEnv.sh.orig #Backup the file
5. Append -Djava.io.tmpdir in SetDomainEnv.sh as below for JAVA_OPTIONS # Do it on both machine if you are not sharing DOMAIN_HOME and planning cluster across machines
-Djava.io.tmpdir=$DOMAIN_HOME/APEX_CONFIG/${SERVER_NAME}
Hint: Search for "iterativeDev" and append the same line with -Djava.jo.tmpdir
6. Modify "java.io.tmpdir" from the web.xml file of apex.war as below and re-deploy the war
<context-param>
<param-name>config.dir</param-name>
<param-value>${java.io.tmpdir}</param-value>
</context-param>
7. Bounce Weblogic Admin and Manged Servers. Make sure to tail the Managed Server log to see apex-config.xml is picked from the new location.
8. Brew a Coffee for yourself :)
- You find the instructions on creating a cluster from weblogic documentation, the steps mentioned above are only to overcome the bdb locking issue whilst creating a cluster.
Did it help?
Edited by: Oratime on Mar 25, 2013 2:44 AM

Recommended configuration for load balanced Portal with load balancer, multiple gateways and multiple servers.

Does anyone have a recommended network, hardware and software configuration guide for a Portal installation running with multiple gateways load balanced (ie one URL) that talk to multiple servers?

David,
We've used Resonate (software) to load balance the gateways. It allows
you to group all the gateways under 1 virtual URL and load balance the
incoming connections over each gateway depending on the rules that you
define in Resonate. Look in the SUN portal whitepapers there is one that
talks about it specifically.
As far as load balancing the calls to the portals, the gateways will
automatically load balance across all the portals that they know about
using a simple round-robin rotation. You may be able to use Resonate in
front of the portals but you may need to activate persistance within
Resonate to ensure that the user always ends up on the portal that he
established his initial connection on (if you want that), check with Sun
on this one.
David Broeren wrote:
Recommended configuration for load balanced Portal with load balancer,
multiple gateways and multiple servers.
Does anyone have a recommended network, hardware and software
configuration guide for a Portal installation running with multiple
gateways load balanced (ie one URL) that talk to multiple servers?
Try our New Web Based Forum at http://softwareforum.sun.com
Includes Access to our Product Knowledge Base!

Best practice for load balancing on SA540

Are there some 'best practice' guide to configure out load balancing on SA540 .?
I've got 2 ADSL lines and would like device to auto manage outgoing traffic .. Any idea ?
Regards

Hi,
SA500 today implements flow based round robin load balancing scheme.
In the case of two WAN link (over ADSL), by default, the traffic should be "roughly" equally distributed.
So in general, users should have no need to configure anything further for load balancing.
The SA500 also supports protocol binding (~PBR) over WAN links. This mechanism offers more control on how traffic can flow.
For example, if you have 1 ADSL with higher throughput than the other ADSL link offers, you can consider to bind bandwidth-hungry app on the WAN link connecting to the higher ADSL link and the less bandwidth-hungary app on the other one. The other traffic can continue to do round robin. This way you won't saturate the low bandwidth link and give users better application experiences.
Regards,
Richard

Mod_oc4j for load-balancing

Guys,
Looking for some feedback on DMSMetricCollector when using "metric" as the selectmethod for load-balancing. What i want to know is that whether the DMSMetricCollector can be configured to use multiple metrics such jvm-heapsiize, servlet-processRequestTime etc, Connection-pools FreePoolSize.value etc ? the documentation doesn't explicitly mention that if its possible, apparently it doesn't but want to check from the experts here, Steve you might have something on this...
Or if there is any other implementation available which supports load-balancing based on multiple performance metrics
Thanks and Regards

can i use this loadbalancer.jar or not?
how to mod_oc4j in standalone app server

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.
Both ethernet adapters are connected to the same LAN and have static IP addresses of 192.168.2.250 and 192.168.2.251.
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.
Does anyone know why this is the case? Does Lion Server use a non-standard DNS configuration? Are there any additional settings I need to configure in Lion's DNS server to make adopt a round robin approach to responding to requests?
Thanks in advance for any help!

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).

New CAS for Load Balancing Exchange 2007

I want to add a new CAS to an existing Exchange 2007 environment (there is already one CAS and it functions properly) to allow for load balancing. After adding the new server I wanted to do some testing (before I actually set it up for load balancing).
If I try to log in to a mailbox using OWA I get an error stating that "Exception type: Microsoft.Exchange.Data.Storage.ConnectionFailedTransient ExceptionException message: Cannot open mailbox". I am sure I am missing something simple, but cannot
figure it out. Could someone point me in the right direction?

Is your new CAS in the same Windows site as the rest of your Exchange servers? In Exchange 2007 and 2010, the CAS needs to be in the same Windows site as the mailbox it is servicing (unless you are accessing from the Internet and the other site has
no externally accessible CAS).

Some confusion about Web Cache clustering for load balancing

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