How to identify a cluster fail over?
Hello,
I am looking for event IDs which show that a cluster failed over. Which log? Application, System, Cluster, Others?
What initiated the fail over?
When the fail over happened?
etc...
Thanks,
DOm
System Center Operations Manager 2007 / System Center Configuration Manager 2007 R2 / Forefront Client Security / Forefront Identity Manager
Hi Sir,
Please refer to following article regarding how to create cluster log :
http://blogs.technet.com/b/askcore/archive/2010/04/13/understanding-the-cluster-debug-log-in-2008.aspx
http://blogs.technet.com/b/askcore/archive/2010/04/13/understanding-the-cluster-debug-log-in-2008.aspx
Best Regards,
Elton Ji
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact [email protected] .
Similar Messages
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Help : Cluster Fail over Test - Could not establish a connection
Hi All
I'm trying to do Cluster fail over test with two Weblogic 8.1 sp2 instances in cluster.
During that testing, I'm restarting the one of the instance which is handing my request, to make sure the session is replicated smoothly to the other instance,so that can continue accessing my application without any interuption. But when I restart the instance, I'm getting following exception
Error 500--Internal Server Error
java.rmi.ConnectException: Could not establish a connection with 8909815174098071019S:dappsn03:[8201,8201,-1,-1,8201,-1,-1,0,0]:dappsn03-04:TNL:tnl1_81dappsn03, java.rmi.ConnectException: Destination unreachable; nested exception is:
java.net.ConnectException: Connection refused; No available router to destination
at weblogic.rjvm.RJVMImpl.getOutputStream(RJVMImpl.java:316)
at weblogic.rjvm.RJVMImpl.getRequestStream(RJVMImpl.java:488)
at weblogic.rjvm.RJVMImpl.getOutboundRequest(RJVMImpl.java:584)
at weblogic.rmi.internal.BasicRemoteRef.getOutboundRequest(BasicRemoteRef.java:91)
at weblogic.rmi.internal.activation.ActivatableRemoteRef.invoke(ActivatableRemoteRef.java:69)
at com.sns.pfk.ejb.PfkSessionBean_mz6mqm_EOImpl_812_WLStub.getPortalRecord(Unknown Source)
at com.sns.pfk.servlet.PfkMainServlet.getInfofromSB(Unknown Source)
at com.sns.pfk.servlet.PfkMainServlet.doActionDisplay(Unknown Source)
at com.sns.pfk.servlet.PfkMainServlet.doGet(Unknown Source)
at com.sns.pfk.servlet.PfkMainServlet.doPost(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:971)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:402)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:305)
at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:607)
at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:400)
at com.sns.ana.ui.servlet.AuthorisationBaseServlet.service(AuthorisationBaseServlet.java:109)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:971)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:402)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:305)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6350)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3635)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2585)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
Buddies, anyone hit this issue before, pls show up some light to escape this hickup.
With Regs
-SHANHi,
Thanx for ones, spend time on reading this thread.This problem was due to some missing entries in weblogic-ejb.xml. This got fixed as we got support from BEA.
With Regs
-SHAN -
This is actually a two part question.
First - I need to upgrade a wireless controller 4402 and I need update boot loader and software. Can I do both at the same time?
Second - How can I prevent the APS from failing over when I reboot with out having to go into each AP and take off secondary controller.Specific to the AP failover. Why dont you deploy AP FALLBACK? When a controller falls offline for
any reason the APs join other controllers. HOWEVER when the controller comes online they will fallback to the controllers
you want with NO intervention from you.
fyi
NoteWhen an access point’s primary controller comes back online, the access point disassociates from the backup controller and reconnects to its primary controller. The access point falls back to its primary controller and not to any secondary controller for which it is configured. For example, if an access point is configured with primary, secondary, and tertiary controllers, it fails over to the tertiary controller when the primary and secondary controllers become unresponsive and waits for the primary controller to come back online so that it can fall back to the primary controller. The access point does not fall back from the tertiary controller to the secondary controller if the secondary controller comes back online; it stays connected to the tertiary controller until the primary controller comes back up. -
How to 'fail-over' CSS11503-AC when ALL 5 Reals Servers (Services) die
Hi all,
Could anyone out there possibly provide an idea/config, of how it is possible to'fail-over' a CSS11503 set-up in Active/Standby mode with "ASR" enabled when:-
- ALL your real servers(Services) for a particular VIP 'die'/OR nic is faulty.
- So NOT just 1 of the real servers, but when ALL 5 are not reachable, I need to 'failover'
My initial thought are to use the "critical reporter" or "critical service" to report back to the 'active' CSS.
Anyone who has done this scenario before , please advise..
thanksThanks very much Syed fo rthis.I was thiking that no-one could answer this query.
After a little tsting, I set the following config in the lab and it works but is different to yours. I cannot seem to configure the servive as "type local". When I input 'type ?; I get options such as nci-direct-return, nci-info-only, proxy-cache, redirect etc...etc..NO 'local'...!!
Please advise..Thanks in advance
************************* INTERFACE ************************* interface 1/1 bridge vlan 800 phy 1Gbits-FD-no-pause
nterface 1/2
phy 1Gbits-FD-no-pause
bridge vlan 20
nterface Ethernet-Mgmt
description "Management Interface"
nterface 2/1
description "1st ASR Link"
isc-port-one
nterface 2/3
description "2nd ASR Link"
isc-port-two
************************** CIRCUIT ************************** circuit VLAN800
description "FE_CORE"
ip address 192.168.83.249 255.255.255.0
ip virtual-router 1 priority 110
ip redundant-vip 1 192.168.83.148
ip redundant-vip 1 192.168.83.158
ip critical-service 1 DTSFE01
ip critical-service 1 DTSFE02
ip critical-service 1 DTSFE03
ip critical-service 1 DTSFE04
ip critical-service 1 DTSFE05
ip critical-reporter 1 Physical_if_DWN
ip critical-reporter 1 r1
ircuit VLAN20
description "LBAL"
ip address 192.168.20.1 255.255.255.0
ip virtual-router 2 priority 110
ip redundant-interface 2 192.168.20.3
ip critical-service 2 DTSFE01
ip critical-service 2 DTSFE02
ip critical-service 2 DTSFE03
ip critical-service 2 DTSFE04
ip critical-service 2 DTSFE05
ip critical-reporter 2 Physical_if_DWN
ip critical-reporter 2 r1
************************** REPORTER **************************
reporter Physical_if_DWN
type critical-phy-all-up
phy 1/1
phy 1/2
active
reporter r1
type vrid-peering
vrid 192.168.83.249 1
vrid 192.168.20.1 2
active
************************** SERVICE **************************
service FE01
ip address 192.168.20.183
keepalive frequency 2
keepalive retryperiod 2
keepalive maxfailure 2
redundant-index 4
service FE02
ip address 192.168.20.184
keepalive frequency 2
keepalive retryperiod 2
keepalive maxfailure 2
redundant-index 5
service FE03
ip address 192.168.20.185
keepalive frequency 2
keepalive retryperiod 2
keepalive maxfailure 2
redundant-index 6
service FE04
ip address 192.168.20.186
keepalive frequency 2
keepalive retryperiod 2
keepalive maxfailure 2
redundant-index 7
service NWFE02
ip address 192.168.20.204
keepalive frequency 2
keepalive retryperiod 2
keepalive maxfailure 2
redundant-index 10
active
!*************************** OWNER *************************** owner SERVICES
content DTS_192.168.83.148_443
add service DTSFE01
add service DTSFE02
add service DTSFE03
add service DTSFE04
add service DTSFE05
vip address 192.168.83.148
port 443
protocol tcp
advanced-balance sticky-srcip
redundant-index 1
sticky-inact-timeout 5
owner NW_SERVICES
content NWCS_192.168.83.158_443
add service NWCSFE01
add service NWCSFE02
vip address 192.168.83.158
protocol tcp
port 443
sticky-inact-timeout 5
redundant-index 2
advanced-balance sticky-srcip
active -
Configuring Fail Over Clustering
I was assigned to configure the New DIA Line for our Data Center for Fail over (Back Up)
My Existing Line is - ISP ==} Router 2811 ==} Juniper SSG320 ==} Cisco Core Switch 6500
For Back Up We get additional line.
How can I configure the Fail Over Clustering the new DIA Lines?
Please see attached my Network Diagram.
Thank you,
MichaelDear All,
My problem is solved by disabling antivirus.
thanks for the support
Sunil
SUNIL PATEL SYSTEM ADMINISTRATOR -
Hi All,
We have a windows fail over cluster having one windows machine on local network as one of its node.
I want to add a virtual cloud machine available on microsoft azure as another node to this existing cluster.
Please suggest how to do this?
Thanking all in advance,
RaghvendraBefore you even start working on the SQL side, you will need to create a Windows Server 2008 R2 cluster with no shared storage. You can actually test that in-house. Create a VM running 2008 R2 and cluster it with your physical (from your description,
I am assuming physical) 2008 R2 machine. Create it with a file share witness for quorum. Then configure your environment to see that it works as expected.
Once you know how to configure the cluster between physical and VM with a file share witness, build it to Azure. The location of the FSW gets to be an interesting choice. To have a FSW in Azure means that you will need another VM in Azure to
host the file share, meaning you have two quorum votes in Azure and one in-house. Or, you could create a file share witness on an in-house system, giving you two quorum votes in-house and one in Azure.
In the FSW in Azure scenario, if you have a loss of the in-house server, automatic failover occurs because two quorum votes exist in Azure. With FSW in-house, depending on the loss you have in-house, you might have to force quorum to get the Azure
single-node cluster to run. Loss of access to Azure reverses those scenarios. Neither one is optimal, but it does provide some level of recoverability.
. : | : . : | : . tim -
Which role do I need DFS or File server on fail over cluster server 2012 R2?
what I want to achieve is that I want to share all my user data files in a central location and to be highly available all the time whether it's a general share or folder redirection data. BUT I'm a bit confused; I have fail over cluster set-up
on server 2012, now I would like to add DFS as a role but than we have another role called File server and virtually it does the same thing as DFS? Means it creates a namespace share that can be access even one of the nodes goes down. Now I am thinking is
that DFS does the replication between two physical location but fail over cluster works slightly differently and with file server it pretty much does the same thing except for replicating data from one drive to another. Now what do you suggest I do or
did I get the concept wrong like a noob?DFS and Failover Clustering for file shares provides a similar end result for file access, but they are significantly different implementations.
Clustering provides high availability to files by presenting shared access to set a files served from a cluster. With 2012 R2 Microsoft added the ability to create a Scale-out File Server that even allows all nodes of the cluster to server access to
the files for a higher level of performance and other great things. Bottom line with Failover Clusters for files is that there is a single copy of the file presented from the cluster.
DFS on the other hand provides high availability to files by presenting multiple copies of the file by making a copy in two or more locations and presenting a naming space that allows access to the file through any of the network paths. DFS works very
well for files that are primarily read-only. When you get into a situation where there is a lot of updating of the shared files, DFS is not a very good solution. There are ways to implement DFS for read/write files, but it generally requires a
good knowledge of how the files are used and how you want to manage them.
The key to answering your question comes in your first sentence "I want to share all my user data files in a central location and to be highly available all the time". My initial reaction to this is that central location means Failover Cluster
- there is only a single copy of the file. However, "all the time" can be compromised by network failures to the central site. Remote sites would not have access if they can't access the central site. DFS provides the ability to
have copies remotely, but then if you allow updating at multiple sites, you have to manage the merging of the changes, among other things.
. : | : . : | : . tim -
Is my installation of SQL Server Fail Over cluster correct?
I made a 2 node SQL Server 2012 fail over cluster but having some problems during installation so I wanted to know if the steps below I performed are correct.
Hardware
Node1 192.168.1.10
Node2 192.168.1.11
Added following entries in DNS
cluster.domain.local 192.168.1.12 (for Windows Cluster)
msdtc.domain.local 192.168.1.13 (for MSDTC)
sql.domain.local 192.168.1.14 (for SQL Server Cluster)
Cluster Storage
Disk1 (for Quorum)
Disk2 (for MSDTC
Disk3 (for SQL Server)
Now comes the installation. I am performing all these steps as DOMAIN ADMIN.
1. First I installed clustering role on both nodes
2. Then I ran fail over validation wizard on Node1 adding both nodes which went fine (there were some warnings)
3. Then I made a Windows Cluster on Node1 using these two nodes. I gave the name and IP to this cluster which I wrote above i.e. cluster.domain.local 192.168.1.12
4. Cluster was created and boths nodes are UP.
Now I want to ask a question here. Is it best practice to perform the above operation using DOMAIN ADMIN? Or if I use a standard domain user account with local admin rights, will it work? If not then exactly what rights are required to perform this operation.
5. Then I installed "Application Server" role on both Node1 and Node2 and also added "Distributed Transaction" feature
6. Then I right clicked on Windows Cluster I created and added a new role/feature which is "DTC"
7. I gave it the same name which I wrote above i.e. msdtc.domain.local 192.168.1.13
8. MSDTC was created but when it tried to UP its service, it threw an error. Upon investigation it turns out the Windows Cluster cluster.domain.local doesn't have proper rights to created some objects in AD. I didn't know what rights to give so I gave it full
permission and after that when I created MSDTC again, the service went up fine.
So I want to know what rights does cluster.domain.com require to make MSDTC?
Am I doing good so far?Hello,
>>Then I made a Windows Cluster on Node1 using these two nodes. I gave the name and IP to this cluster which I wrote above i.e. cluster.domain.local 192.168.1.10
Hello I suppose this IP was physical node IP windows cluster IP was 192.168.1.12 I suppose yo must have given this IP as windows cluster IP.10 and 11 are physical nodes in Cluster but 12 is Cluster IP .Correct me if I am wrong.
Did you do failover and failback to check whether cluster is configured correctly or not ,If not please do it .
>>Then I ran fail over validation wizard on Node1 adding both nodes which went fine (there were some warnings)
Please remove warnings also ,it might cause issue.Not sure its correct every time but make sure cluster validation should be free of error and warning.
>>Now I want to ask a question here. Is it best practice to perform the above operation using DOMAIN ADMIN?
You can do it with domain admin account as this is required to create Cluster NAme object(CNO) in domain and local account might not have that right so I would say its ok.
>>I gave it the same name which I wrote above i.e. msdtc.domain.local
192.168.1.11
again this IP is node 2 IP how can you give it to MSDTC.Use below link for reference
http://blogs.msdn.com/b/cindygross/archive/2009/02/22/how-to-configure-dtc-for-sql-server-in-a-windows-2008-cluster.aspx
Please mark this reply as the answer or vote as helpful, as appropriate, to make it useful for other readers -
SQL 2005 cluster rejects SQL logins when in failed over state
When SQL 2005 SP4 on Windows 2003 server cluster is failed over from Server_A to Server_B, it rejects all SQL Server logins. domain logins are OK. The message is "user is not associated with a trusted server connection", then the IP of the
client. This is error 18452. Anyone know how to fix this? They should work fine from both servers. We think this started just after installing SP4.
DaveKHello,
The connection string is good, you're definitely using sql auth.
LoginMode on Server_B is REG_DWORD 0x00000001 (1) LoginMode on Server_A is REG_DWORD 0x00000002 (2) Looks like you are on to something. I will schedule another test failover. I assume a 2 is mixed mode? If so, why would SQL allow two different modes
on each side of a cluster?
You definitely have a registry replication issue, or at the very least a registry that isn't in sync with the cluster. This could happen for various reasons, none of which we'll probably find out about now, but never the less...
A good test would be to set it to windows only on Node A, wait a minute and then set it to Windows Auth and see if that replicates the registry setting across nodes correctly - this is actually the windows level and doesn't have anything to do with SQL Server.
SQL Server reads this value from the registry and it is not stored inside any databases (read, nothing stored in the master database) as such it's a per machine setting. Since it's not set correctly on Node B, when SQL server starts up it correctly reads
that registry key and acts on it as it should. The culprit isn't SQL Server, it's Windows Clustering.
Hopefully this makes a little more sense now. You can actually just edit the registry setting to match Node A and fail over to B, everything should work correctly. It doesn't help you with a root cause analysis which definitely needs to be done as who knows
what else may not be correctly in sync.
Sean Gallardy | Blog |
Twitter -
Is there a way to config WLS to fail over from a primary RAC cluster to a DR RAC cluster?
Here's the situation:
We have two Oracle RAC clusters, one in a primary site, and the other in a DR site
Although they run active/active using some sort of replication (Oracle Streams? not sure), we are being asked to use only the one currently being used as the primary to prevent latency & conflict issues
We are using this only for read-only queries.
We are not concerned with XA
We're using WebLogic 10.3.5 with MultiDatasources, using the Oracle Thin driver (non-XA for this use case) for instances
I know how to set up MultiDatasources for an individual RAC cluster, and I have been doing that for years.
Question:
Is there a way to configure MultiDatasources (mDS) in WebLogic to allow for automatic failover between the two clusters, or does the app have to be coded to failover from an mDS that's not working to one that's working (with preference to a currently labelled "primary" site).
Note:
We still want to have load balancing across the current "primary" cluster's members
Is there a "best practice" here?Hi Steve,
There are 2 ways to connect WLS to a Oracle RAC.
1. Use the Oracle RAC service URL which contains the details of all the RAC nodes and the respective IP address and DNS.
2. Connect to the primary cluster as you are currently doing and use a MDS to load-balance/failover between multiple nodes in the primary RAC (if applicable).
In case of a primary RAC nodes failure and switch to DR RAC nodes, use WLST scripts to change the connection URL and restart the application to remove any old connections.
Such DB fail-over tests can be conducted in a test/reference environment to set up the required log monitoring and subsequent steps to measure the timelines.
Thanks,
Souvik. -
TES v6.1 want to install a Win Tidal Agent on a Cluster Resource with Fail Over... help
I am working with my Window Admins and they want to know how to install the Win Tidal Agent on a Cluster Resource with Fail Over. Currently running Tidal Master (UNIX) v6.1.0.483
Thanks,
RichPlease refer to the Agent Installation and Configuration guide.pdf from Cisco. The steps to configure the agents in a cluster have been explained in section Configuring the Agents for a Cluster
-
How Front End pool deals with fail over to keep user state?
Hello to all, I searched a lot of articles to understand how Lync 2010 keeps user state if a fail happens in a Front Pool node, but didn't find anything clear.
I found a MS info. about ths topic : " The Front End Servers maintain transient information—such as logged-on state and control information for an IM, Web, or audio/video (A/V) conference—only for the duration of a user’s session.
This configuration
is an advantage because in the event of a Front End Server failure, the clients connected to that server can quickly reconnect to another Front End Server that belongs to the same Front End pool. "
As I read, the client uses DNS to reconnect to another Front End in the pool. When it reconnects to an available server, does he lose what he/she was doing at Lync client? Can the server that is now hosting his section recover all
"user's session data"? Is positive, how?
Regards, EEOC.The presence information and other dynamic user data is stored in the RTCDYN database on the backend SQL database in a 2010 pool:
http://blog.insidelync.com/2011/04/the-lync-server-databases/ If you fail over to another pool member, this pool member has access to the same data.
Ongoing conversations and the like are cached at the workstation.
Please remember, if you see a post that helped you please click "Vote As Helpful" and if it answered your question please click "Mark As Answer".
SWC Unified Communications -
Hi,
New to 2012 and implementing a clustered environment for our File Services role. Have got to a point where I have successfully configured the Shadow copy settings.
Have a large (15tb) disk. S:
Have a VSS drive (volume shadow copy drive) V:
Have successfully configured through Windows Explorer the Shadow copy settings.
Created dependencies in Failcover Cluster Server console whereby S: depends on V:
However, when I failover the resource and browse the Client Access Point share there are no entries under the "Previous Versions" tab.
When I visit the S: drive in windows explorer and open the Shadow copy dialogue box, there are entries showing the times and dates of the shadow copies ran when on the original node. So the disk knows about the shadow copies that were ran on the
original node but the "previous versions" tab has no entries to display.
This is in a 2012 server (NOT R2 version).
Can anyone explain what might be the reason? Do I have an "issue" or is this by design?
All help apprecieated!
Kathy
Kathleen Hayhurst Senior IT Support AnalystHi,
Please first check the requirements in following article:
Using Shadow Copies of Shared Folders in a server cluster
http://technet.microsoft.com/en-us/library/cc779378(v=ws.10).aspx
Cluster-managed shadow copies can only be created in a single quorum device cluster on a disk with a Physical Disk resource. In a single node cluster or majority node set cluster without a shared cluster disk, shadow copies can only be created and managed
locally.
You cannot enable Shadow Copies of Shared Folders for the quorum resource, although you can enable Shadow Copies of Shared Folders for a File Share resource.
The recurring scheduled task that generates volume shadow copies must run on the same node that currently owns the storage volume.
The cluster resource that manages the scheduled task must be able to fail over with the Physical Disk resource that manages the storage volume.
If you have any feedback on our support, please send to [email protected] -
What hardware is required to setup Fail over cluster using windows 2003 enterprise edition.
I want to setup fail over cluster...i have already installed HP 350 G6 server in my environment. now i want to know which hardware i may require to setup failover cluster for statefull application. and secondly, does my existing server can be utilized .
AN Update:
The Oracle Universal Installer shows the following in the screen before the error appears:
Starting Oracle Universal Installer...
No pre-requisite checks found in oraparam.ini, no system pre-requisite checks w
ill be executed.
Preparing to launch Oracle Universal Installer from D:\DOCUME~1\ADMINI~1\LOCALS
~1\Temp\OraInstall2011-03-02_04-25-26PM. Please wait ... Oracle Universal Instal
ler, Version 10.1.0.6.0 Production
Copyright (C) 1999, 2007, Oracle. All rights reserved.
...............................................................Val: 0
Val: 0
Val: 0
Val: 2
Val: 0
Val: 0
Val: 0
Val: 2
Val: 0
Val: 0
Val: 0
Val: 0
Val: 0
Val: 0
Val: 2
Val: 0
Val: 0
Val: 0
Val: 0
Val: 2
Val: 0
Val: 0
path: D:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\OraInstall2011-03-02_04-25-26PM\jre\bin
;.;D:\WINDOWS\system32;D:\WINDOWS;D:\StageR12\startCD\Disk1\rapidwiz\unzip\NT;D:
\MVS\VC\bin;D:\cygwin\bin;D:\WINDOWS\system32;D:\WINDOWS;D:\WINDOWS\System32\Wbe
m
toload is D:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\OraInstall2011-03-02_04-25-26PM\Win
dowsGPortQueries.dll
100% Done.
Copying files in progress (Wed Mar 02 16:25:59 IST 2011)
.................................................Val: 0
. 79% Done.
Copy successful
Setup in progress (Wed Mar 02 16:26:05 IST 2011)
.....Oracle JAAS [Wed Mar 02 16:26:28 IST 2011]: exception: 9
opmnctl: opmn started
Please help me.
Thanks and regards,
Adm -
How do the application servers connect the new database after failing over from primary DB to standby DB?
We have setup a DR environment with a standalone Primary server and a standalone Physical Standby server on RHEL Linux 6.4. Now our application team would like to know:
When the primary DB server is crashed, the standy DB server will takeover the role of primary DB through the DataGuard fast failover. As the applications are connected by the primary DB IP before,currently the physical DB is used as a different IP or listener. If this is happened, they need to stop their application servers and re-configure their connection so the they coonect the new DB server, they cannot tolerate these workaround.
Whether does oracle have the better solution for this so that the application can automatically know the role's transition and change to the new IP without re-confige any connection and shutdown their application?
Oracle support provides us the answer as following:
==================================================================
Applications connected to a primary database can transparently failover to the new primary database upon an Oracle Data Guard role transition. Integration with Fast Application Notification (FAN) provides fast failover for integrated clients.
After a failover, the broker publishes Fast Application Notification (FAN) events. These FAN events can be used in the following ways:
Applications can use FAN without programmatic changes if they use one of these Oracle integrated database clients: Oracle Database JDBC, Oracle Database Oracle Call Interface (OCI), and Oracle Data Provider for .NET ( ODP.NET). These clients can be configured for Fast Connection Failover (FCF) to automatically connect to a new primary database after a failover.
JAVA applications can use FAN programmatically by using the JDBC FAN application programming interface to subscribe to FAN events and to execute event handling actions upon the receipt of an event.
FAN server-side callouts can be configured on the database tier.
FAN events are published using Oracle Notification Services (ONS) and Oracle Streams Advanced Queuing (AQ).
=======================================================================================
Who has the experience and the related documentation or other solutions? we don't have the concept of about FAN.
Thank very much in advance.Hi mesbeg,
Thanks alot.
For example, there is an application JBOSS server connecting the DB, we just added another datasource and put the standby IP into the configuration file except adding a service on DB side like this following:
<subsystem xmlns="urn:jboss:domain:datasources:1.0">
<datasources>
<datasource jta="false" jndi-name="java:/jdbc/idserverDatasource" pool-name="IDServerDataSource" enabled="true" use-java-context="true">
<connection-url>jdbc:oracle:thin:@<primay DB IP>:1521:testdb</connection-url>
<connection-url>jdbc:oracle:thin:@<standby DB IP>:1521:testdb</connection-url>
<driver>oracle</driver>
<pool>
<min-pool-size>2</min-pool-size>
<max-pool-size>10</max-pool-size>
<prefill>true</prefill>
</pool>
<security>
<user-name>TEST_USER</user-name>
<password>Password1</password>
</security>
<validation>
<valid-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleValidConnectionChecker"/>
<validate-on-match>false</validate-on-match>
<background-validation>false</background-validation>
<use-fast-fail>false</use-fast-fail>
<stale-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleStaleConnectionChecker"/>
<exception-sorter class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleExceptionSorter"/>
</validation>
</datasource>
<drivers>
<driver name="oracle" module="com.oracle.jdbc">
<xa-datasource-class>oracle.jdbc.OracleDriver</xa-datasource-class>
</driver>
</drivers>
</datasources>
</subsystem>
If the failover is occurred, the JBOSS will automatically be pointed to the standby DB. Additional actions are not needed.
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