More fault tolerance

Ok. Here goes. I am trying to use BPEL to generate a workflow based on information it gets from XML and use the workflow to call different web services (in a specific order) that provide some incremental functionality to my job. There may be more than one web service for a given functionality. Also a web service may fail at doing the task because it did not have essential resources. In the event of that happening, can BPEL go back one (or a few steps-depending on dependencies) and then replan ( generate a different script) to get the job done, using values that it might have stored in the oracle database?
This automatic workflow generation and fault tolerance would certainly help....
Thanks,
Faraz

Hi!
This is an interesting use case. We do not offer those features out of the box at this time. You might want to take a look at the replay fault capability. Combine with a programmic use of bpelc to generate and compile on the fly a bpel process, it might provide a step in the direction you are looking for.
Edwin

Similar Messages

Load Balancing & Fault tolerance in Oracle Apps

Hello
I am pretty new to Oracle Apps and Oracle 9iAS
We are trying to asked to find out the ways of deplying load balancing and fault tolerance in Oracle Apps
I have gone thru the following articles of metalink and some more from google
Configuring Web Cache as a Load Balancer for Application Servers
Create new middle tier node in existing Apps 11i environment using cloning and then load balance
Integrating and using Web Cache with Forms 9i for Load Balancing
Running Multiple OC4J Instances From a Single Install of 9iAS 1.0.2.2
LOAD BALANCING ORACLE APPLICATIONS ON UNIX
Load Balancing in 11i
OC4J Clustering Setup
OC4J Load Balancing for Forms 9i
Setting up 11i E-Business suite using a hardware load balancer
Sharing an APPL_TOP in Oracle Applications 11i
In Oracle Apps Concepts pdf, found that
Load balancing occurs when there are multiple installations of web server, forms server, reports server, concurrent manager server etc
Lets consider forms server component of middle tier
Can there be multiple INSTANCES of forms server within SINGLE INSTALLATION ???
If it has to be MULTIPLE INSTALLATIONS, then it will require multiple physical machines
What is software load balancing then ???
Also read that
Oracle 9i AS instance is combition of Oracle HTTP Server (OHS) and one or more instances of Oracle9iAS Container for J2EE (OC4J)
Thus software load balancing can be implemented for Web server component of middle tier using multiple instances of OC4J ???
Forms metrix server configuration is hardware load balancing ??
What about Oracle9iAS Web Cache clustering ??
Please clarify the doubts and suggest me the way
Thanks a lot

dear all can any one help me on the following;
We want to install Oracle Apps 11.5.9 on 4 IBM AIX 5L boxes, the first node
will hold the database , concurrent and Admin Tiers. as for the other 3 nodes
it will hold the Forms/Web Tiers and we need to use forms metrics for load
balancing taking into consideration that we can't use Shared APPL_TOP. we tried
to find the way how to install and configure this solution but all the
documents are talking aboout the concept only and this concept is applicable.
We need the exact steps on how do the installation either using rapidwiz or any
thing else
fadi

Load Balance & Fault Tolerance

I need do design a solution for load balance the DLSw traffic between 4 central routers and, if this 4 routers fail (oe wan fail) all peers and circuits need to be restablished on other site with other 4 routers.
To balance the traffic I will use the DLSw circuit count. To provide fault tolerance between sites I thinking to use backup peer.
My question is, "circuit count" will work togheter with "backup peer" ?
Thank´s in advance.

Only one backup dlsw peer is allowed. I cut and paste the following when I try to define more than one backup peer:
c3-2500(config)#dlsw remote-peer 0 tcp 2.2.2.2
c3-2500(config)#dlsw remote-peer 0 tcp 3.3.3.3 backup-peer 2.2.2.2
c3-2500(config)#dlsw remote-peer 0 tcp 4.4.4.4 backup-peer 2.2.2.2
%Primary peer already has backup defined
There are a number of approaches:
1. Remote routers have 8 peer connections. The cost for A, B, C, and D are lower than that of E, F, G, and H. Normally, the circuits are distributed among A, B, C, and D. Even one or more than one of A, B, C, and D goes down, the rest will take the load. If all A, B, C, and D goes down, E, F, G, and H will take all the circuits.
2. Slightly different than 1. Instead of making E, F, G, and H are permanent DLSw peer connection, make E is a backup peer for A, F is a backup peer for B, and so on.
3. Just another idea. Have you considered SNASw using HPR/IP? It may take you a while to set up on the host. However, this is the way to go because IBM has stopped selling 3746/3745. All SNI link will eventually go to HPR/IP.

UOO sequencing along with WLS high availability cluster and fault tolerance

Hi WebLogic gurus.
My customer is currently using the following Oracle products to integrate Siebel Order Mgmt to Oracle BRM:
* WebLogic Server 10.3.1
* Oracle OSB 11g
They use path service feature of a WebLogic clustered environment.
They have configured EAI to use the UOO(Unit Of Order) Weblogic 10.3.1 feature to preserve the natural order of subsequent modifications on the same entity.
They are going to apply UOO to a distributed queue for high availability.
They have the following questions:
1) When during the processing of messages having the same UOO, the end point becomes unavailable, and another node is available in order to migrate, there is a chance the UOO messages exist in the failed endpoint.
2) During the migration of the initial endpoint, are these messages persisted?
By persisted we mean that when other messages arrive with the same UOO in the migrated endpoint this migrated resource contains also the messages that existed before the migration?
3) During the migration of endpoints is the client receiving error messages or not?
I've found an entry on the WLS cluster documentation regarding fault tolerance of such solution.
Special Considerations For Targeting a Path Service
When the path service for a cluster is targeted to a migratable target, as a best practice, the path
service and its custom store should be the only users of that migratable target.
When a path service is targeted to a migratable target its provides enhanced storage of message
unit-of-order (UOO) information for JMS distributed destinations, since the UOO information
will be based on the entire migratable target instead of being based only on the server instance
hosting the distributed destinations member.
Do you have any feedback to that?
My customer is worry about loosing UOO sequencing during migration of endpoints !!
best regards & thanks,
Marco

First, if using a distributed queue the Forward Delay attribute controls the number of seconds WebLogic JMS will wait before trying to forward the messages. By default, the value is set to −1, which means that forwarding is disabled. Setting a Forward Delay is incompatible with strictly ordered message processing, including the Unit-of-Order feature.
When using unit-of-order with distributed destinations, you should always send the messages to the distributed destination rather than to one of its members. If you are not careful, sending messages directly to a member destination may result in messages for the same unit-of-order going to more than one member destination and cause you to lose your message ordering.
When unit-of-order messages are processed, they will be processed in strict order. While the current unit-of-order message is being processed by a message consumer, the next message in the unit-of-order will not be delivered unless it is to the same transaction or session. If no message associated with a particular unit-of-order is processing, then a message associated with that unit-of-order may go to any session that’s consuming from the message’s destination. This guarantees that all messages will be processed one at a time and in order, and any rollback or recover will not prevent ordered processing of the messages.
The path service uses a persistent store to save the state of which member destination a particular unit-of-order is currently using. When a Path Service receives the first message for a particular unit-of-order bound for a distributed destination, it uses the normal JMS load balancing heuristics to select which member destination will handle the unit and writes that information into its persistent store. The Path Service ensures that a new UOO, or an old UOO that has no messages currently on any destination, can be enqueued anywhere in the cluster. Adding and removing member destinations will not disrupt any existing unit-of-order because the routing decision is made dynamically and those decisions are persistent.
If the Path Service is unavailable, any requests to create new units-of-order will throw the JMSOrderException until the Path Service is available. Information about existing units-of-order are cached in the connection factory and destination servers so the Path Service availability typically will not prevent existing unit-of-order messages from being sent or processed.
Hope this helps.

Fault-Tolerant Networks

Hi,
For testing i want implementation one technique from fault-tolerant network (Simple) in virtual environment.
Can you help me? Thanks

Hi Arash_89,
General practices to be considered when configuring networks in Failover Clusters about the network contains many aspects, such Identifying single points of failure and configuring
redundancy at every point in the network is very critical to maintain high availability, you can refer the following article to know more detail:
Configuring Windows Failover Cluster Networks
http://blogs.technet.com/b/askcore/archive/2014/02/20/configuring-windows-failover-cluster-networks.aspx
I’m glad to be of help to you!
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are trying to better understand customer views on social support experience, so your participation in this
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How do I create a fault-tolerant DLL call from LV?

I've created an .exe from a VI that calls a DLL, when that DLL crashes,
it crashes the whole application. This DLL is too complicated to
completely debug and it, in turn calls DLLs I have no control
over. It crashes approximately once every 100,000 iterations.
How do I make a DLL call fault-tolerent?
Attachments:
crash.gif ‏19 KB

I might not have been very clear in my answer - this isn't a feature that CAN be added to LabVIEW...the DLL threw an unhandled exception across a DLL interface - which pretty much means a system exception (code shouldn't be throwing language exceptions across DLL boundaries as they are language specific). This means that something went very wrong with the code and there is a good chance that the process space has been corrupted. And from my own debugging experience, if it's only crashing 1 time out of 100,000, that doesn't mean it isn't corrupting memory or otherwise causing problems...it was just the time it was caught.
Considering this, the Call Library Node already is fault tolerant - we catch the exception and report it to the user. You have a valid position that we should simply return this as an error. It's also a valid position that it would be a road paved with good intentions. All you need to do is remember what life was like in Windows 3.1 - where one process could silently corrupt another - to realize the amount of untraceable errors that could occur. Yes, the error out value should be handled by the user, but when an application of 100's or 1000's of VIs crashes seemingly at random because someone didn't, you can see the problem.
I will say I like the idea of a separate memory space. It is unfortunate that Windows only offers that through creating a separate process, but it is a neat idea. I worked in the VXI/VME world for a while, which does have multiple address spaces.
BTW - using signal handlers to catch exceptions is unfortunately not a 100% solution...signals are a partial port of a Unix concept in Windows. You would be best to use SEH around the call (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccelng/htm/key_s-z_4.asp). If the DLL is already a C++ DLL, then you can use the global catch of C++ instead
int err = 0;
try {
} catch(...) {
err = -1;
Again, you still are at risk of a corrupted process, but this allows you to avoid our handling of it.
Having spent years writing and (god help me) debugging device drivers, I love this topic. If you want to talk more about it and various options, feel free to shoot me an email at [email protected].
Brian Tyler
http://detritus.blogs.com/lycangeek

What is the difference with 1 Lync Standard Edition using VMware Fault Tolerant and 2 Lync Enterprise Edition in a cluster

Hi
As I will be planning to setup Lync on a virtual environment regardless if it is going to be the Standard or Enterprise edition.
I am thinking if we use 1 Lync Standard Edition for the FE Server with Fault Tolerance enabled, would it be as good as having 2 Lync Enterprise Edition in a cluster?
Thanks

Hi there,
the main difference between using Lync enterprise and lync standard is the High availability and scalability feature,
you will get fault tolrance setup with one lync standard edition running on whatever hyper-v and vmware platform, however this will not be an optimum highly available solution for the simple reason that upon a host server failure the image will move
to another available host server and users will lose their active session durin the move process.
on the other hand what you will gain if you the Enterprise edition is that you will have a unique identity to which all lync clients will be connecting and this identity is the lync pool identity which is in the background handled with multiple Front-End
servers and AV conferencing pools, mediation pools and so on.
In additioin when you have multiple front-ends in place, those front-ends will not work in active/passive mode as in a regular cluster, in contrairy all the servers will be active and handeling the work load.
hope i make it a bit clear, if yiu need more info i am ready
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread
Thanks for the response, being a small environment of 300 users, standard edition would be more than enough for me but the fact for HA is very critical for me at this stage. That is why I am exploring the option of using VMware FT.
I don't quick get what you mean on the users having to move to another image as my understanding of FT is in the event of a host failure (not VM failure like bluescreen etc), the VM will fail over to another host with no lost in any ping etc.
So, in theory, the Lync Server VM would never know that the parent ESX host had failed and it needed to failover to another host. Hope my understanding is correct.
Thanks

AGPM High Availability / Fault Tolerance

I’m looking for any informations about Advanced Group Policy Management (AGPM) High Availability / Fault Tolerance.
The most interesting is that, in introduction for AGPM Planning Guide is described section about
Planning for AGPM high-availability and improved fault tolerance, but content not exists.
Microsoft MVP: Virtual Machine | http://blog.porowski.pro |
http://VirtualizationGeek.PL

Hi,
You may type the key words into the bing of TechNet website to search for the information you need. According to my search,
the following two links inlcude the detailed information regarding AGPM. But less information regarding AGPM High Availability / Fault Tolerance can be found from TechNet website.
Advanced Group Policy Management 4.0 Documents
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=58FD6CDA-0210-4DA0-91D2-8C3CC2817DF8&displaylang=en
Advanced Group Policy Management
http://technet.microsoft.com/en-us/library/dd420466.aspx
Based on the current situation, I will also submit a feedback to Microsoft through our internal channel and requst more contents regarding
AGPM High Availability / Fault Tolerance to be published. While we cannot guarantee that these contents will be added, we would like to ensure you that we will make every effort to see that they do.
Arthur Li
TechNet Subscriber Support
in forum
If you have any feedback on our support, please contact
[email protected] .
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Fault Tolerance - MCS 7825 H3 & MCS 7835 H2 Servers

Hi,
I have enabled network fault tolerance on my CUC and CCM Servers, i thought after enabling the network fault tolerance the server would change the mac address to Virtual mac address which indeed it may affect the licenses.
But after enabling fault tolerance and restarting the server also i didn't see any change in the MAC ID. Its the same MAC ID.
Pls advice.
Regards
Jagadish G

Hi Jagadish,
do u get the option of 1000 MB/s when u configure set network nic eth0 speed ? can u check?
secondly, Bond 0 would be showing Auto disabled which cannot be changed.
Can u share snapshot of show netowrk failover?
regds,
aman

Deterministic Fault Tolerant Load Balancing

The USA has an unfortunate penchant for granting patents that arguably do not merit patent protection. Some of these are things that are blindingly obvious. Others are just not sufficiently inventive.
Anyway, since I have no funds for patent searches, nor patent applications, and there are some other complications, I've decided to post this to establish prior-art for an algorithm. I don't claim that the algorithm is clever, nor novel, nor even that it violates no existing patents. This posting is simply to ensure that to the extent that someone might be granted a patent on it, they can't, because it has already been published.
The Java connection is that I've done a fair amount of the work required to turn this into a real system in Java.
Suppose you have set of processors, p0 thru pn-1, and each piece of work to be performed by a processor has some number k associated with it. The problem is to allocate the work roughly equally across the subset of processors that are actually functioning. Further, over a period of time, a series of related pieces of work may arrive with the same k. To the maximum possible extent you want each of the related pieces of work to be handled by the same processor. If a processor fails, you want its work to be distributed across the remaining processors, but still maintaining the property that pieces of work with a given value for k are handled by the same processor. In general we assume that the k values are randomly spread through a large number space.
The motivation for these requirements is that for a given k the processor may be caching information that improves performance. Or it may be enforcing some invariant, such as in a lock manager where each request for a given lock must go to the same processor, or it clearly won't function.
To achieve this, construct a list of integers of size n. Element i contains i if processor i is functional, and -1 otherwise.
Calculate k mod n, and use the result as an index into the list. If the value contained there is non-negative, then it is the number of the processor to use. If it is -1, remove the element from the list, decrement the value of n and repeat. Continue until a processor number is found.
This scheme is fault tolerant to a degree, in that the resulting system has a high level of availability.
It also has the property that the failure of a processor only impacts on the allocation of pieces of work that would have been allocated to the failed processor. It does not result in a complete rearrangement of the work allocations. This makes things a lot simpler when dealing with things like distributed lock managers.
The fault tolerance can be improved by an extension of the algorithm that allows a distributed master/slave arrangement, where the master number for a given k is determined as above, and a slave number is obtained by treating the master as if it were not functioning. Each processor is a master for some subset of the k values, and is a slave for another subset. For any given master, each of the other processors is a slave for a roughly equal portion of the given master's subset of the k values.
There are some boring details that I've not discussed, such as how an entity wanting work to be done determines which processors are functioning, and the stuff related to the exact sequence of steps that must be performed when a processor breaks, or is repaired. I don't believe anyone could patent them because once you start thinking about it, the steps are pretty obvious.

I wouldn't be so sure that a simple post to the java forums
is all you need to prove this 'prior-art' is it ?
Don't you need to actually use it? Or have you seen a laywer
and this was their advice. Even if you have no money for it Im sure
there are free legal services; even universities, you could contact.
I don't believe anyone could patent them because once you
start thinking about it, the steps are pretty obvious.The steps of anything a generally simple, it's the putting-them-together
that you can patent :)

Fault tolerant EJBs

Hello,
I'm trying to set up a fault tolerant EJB service. I have two application servers with EJB's deployed on them. The two deployments are identical. Client is a portal application. The EJB client configuration file sun-web.xml looks like this:
>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sun-web-app PUBLIC
"-//Sun Microsystems Inc.//DTD Sun ONE Application Server 7.0 Servlet 2.3//EN"
"file:/etc/opt/SUNWps/dtd/sun-web-app_2_3-0.dtd">
<sun-web-app>
<ejb-ref>
<ejb-ref-name>ejb/userService</ejb-ref-name>
<jndi-name>corbaname:iiop:server1:3700,iiop:server2:3700#ejb/userService</jndi-name>
</ejb-ref>
<ejb-ref>
<ejb-ref-name>ejb/chosenService</ejb-ref-name>
<jndi-name>corbaname:iiop:server1:3700,iiop:server2:3700#ejb/chosenService</jndi-name>
</ejb-ref>
</sun-web-app>
Everything works fine as long as server1 is up. The system doesn't work after I shut it dow. On the client I get this exception:
>
[#|2006-02-01T13:13:07.939+0200|WARNING|sun-appserver-ee8.1_02|javax.enterprise.resource.corba.S1AS-ORB.rpc.transport|_ThreadID=12;|"IOP00410201: (COMM_FAILURE) Connection failure: socketType: IIOP_CLEAR_TEXT; hostname: 10.111.143.169; port: 3700"
org.omg.CORBA.COMM_FAILURE: vmcid: SUN minor code: 201 completed: No
at com.sun.corba.ee.impl.logging.ORBUtilSystemException.connectFailure(ORBUtilSystemException.java:2257)
at com.sun.corba.ee.impl.logging.ORBUtilSystemException.connectFailure(ORBUtilSystemException.java:2278)
at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.<init>(SocketOrChannelConnectionImpl.java:208)
at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.<init>(SocketOrChannelConnectionImpl.java:221)
at com.sun.corba.ee.impl.transport.SocketOrChannelContactInfoImpl.createConnection(SocketOrChannelContactInfoImpl.java:104)
at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.beginRequest(CorbaClientRequestDispatcherImpl.java:153)
at com.sun.corba.ee.impl.protocol.CorbaClientDelegateImpl.request(CorbaClientDelegateImpl.java:127)
at com.sun.corba.ee.impl.protocol.CorbaClientDelegateImpl.is_a(CorbaClientDelegateImpl.java:244)
Why doesn't it switch to server2? Did I miss something?

Hi,
did you try to specify the JVM parameter -Dcom.sun.appserv.iiop.endpoints=<server1>:port1,<server2>:port2 for the jvm where the client is running?

WL 7.0 Fault-tolerant stateful beans. (Newbie)

Hello,
I was wondering if in WL 7.0 there is a way to make a stateful session
bean automatically persist its state without having to be passivated
as a whole.
The bean that I need to build would persist its state to a DB each
time a remote method call is executed in it. The purpose is to make
this bean fault tolerant without having to serialize the whole object
graph by using passivation.
I heard that WL 7.0 has a new feature that can make this happen but I
can't seem to find any info on this. Could anyone point me into the
right search path?
Thanks in advance.
Mateo.

I'm not aware of such feature in WLS 7.0 EJB container.
Where did you heard about it? If at all there's a feature you should
be able to locate at our online docs.
Here's the link
http://e-docs.bea.com/wls/docs70/ejb/index.html
Kumar
Mateo wrote:
Hello,
I was wondering if in WL 7.0 there is a way to make a stateful session
bean automatically persist its state without having to be passivated
as a whole.
The bean that I need to build would persist its state to a DB each
time a remote method call is executed in it. The purpose is to make
this bean fault tolerant without having to serialize the whole object
graph by using passivation.
I heard that WL 7.0 has a new feature that can make this happen but I
can't seem to find any info on this. Could anyone point me into the
right search path?
Thanks in advance.
Mateo.

Load balancing and fault tolerance in BPEL PM

BPEL documentation talks about the ability of clustering processes in BPEL PM Server for fault tolerance and Load balancing. Can anybody tell me how is it done?
Thanks

Have you seen these links?
http://www.oracle.com/technology/products/ias/hi_av/BPEL_HA_Paper.pdf
http://download-uk.oracle.com/docs/cd/B31017_01/integrate.1013/b28980/clusteringsoa.htm#CHDCGIEJ

JMS adapters in a fault tolerant environment

Hi,
I am working on some IDOC <> XI <> JMS scenario's in a SONICMQ fault tolerant invironment, meaning that on communication channel level hostname should be dynamic.
XI is sending to SONIC when JMS system a is down send to system b....
Any suggestions? Samples?
Thanks.

Hi,
Check this below note and Q 2.9..
Note 856346 - J2EE JMS Adapter: Frequently Asked Questions (FAQ)
2.9) How do I configure the receiver JMS communication channel to dynamically target a message to a queue that is different from what is statically configured?
Answer: The mechanics follow the same semantics as described in the JMSReplyTo question answered previously.
Regards,
Srini

Fault tolerance

Hi support,
there is an oss note certifying the use of fault tolerance vSphere 4.1 in production environment?
I have read the best practices for its use with MSCS, but I find no note
Thanks a lot

Hello,
unfortunately, we did not mention the use of VMware Fault Tolerance (FT) in an SAP Note so far. But it is supported.
The use case for FT is quite limited as FT only support Virtual Machines with 1 vCPU. In an SAP environment, we recommend using FT for the SAP System Central Services (SCS / ASCS). See the [SAP HA Best Practices Guide|http://www.vmware.com/resources/techresources/10031]. Note: this is not about using FT in connection with MSCS (which is not supported afaik), but rather descirbing alternatives.
Kind regards,
Matthias Schlarb

More fault tolerance

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