Fail-over functions

I went for an interview. there was a simple test before the interview. One of the questions is:
What are the Oracle fail-over functions? which of them can only be used in RAC?
What i can think of is the Transparent Application Failover(TAF). Any other fail-over functions?

Connect-Time Failover,
Transparent - Time Failover,
& you can add Load Balancing as well.
1 Client-Side Load Balancing
2. Server-Side Load Balancing.
& More info on this from ML Note:226880.1
1) client side connect time load balance only
2) server side listener connection load balance with client side connect
time load balance
3) server side listener connection load balance only
3) transparent application failover
Message was edited by:
Ravi Prakash

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Auto fail over function

Hi all,
Does anybody know whether is there an auto fail over function builded into the new PDF Generator software engine?
Thanks in advance

If there is an underlying exception, it will be in the bottom-most "caused by" of the exception thrown by ODSI. Or in the SOAP Fault if using the web-service API. So the real question is - why can't you get the exception information you need without using fail-over?
- Mike
Last resort, not recommended, ...
If you insist on re-inventing the wheel - use fail-over in the very-top query only. Define all your top-level queries to return an element that contains a "choice" (google on xml schema choice) of the expected result or your <errorElement>, then your top-level queries will look like ...
function myFunction( $arg0 as xs:string ... ) as element(myElementOrError)* {
failover( myBadFunction($arg0 ...) , <errorElement> .... </errorElement> )
Notice that there is NO WAY to populate <errorElement> with the underlying exception that occurred in myBadFunction(). The client is going to get a message like "myBadFunction failed" - which is not really helpful at all. The client (or audit provider) could find the underlying failure - it is output in the audit stream if so configured). There is a try/catch in XQSE - but XQSE does not optimize at all.
In the end, all I can say is that you are pursuing a really difficult way to achieve something that you get automatically. Your client has to handle exceptions / SOAP faults anyway (if the ODSI server is down, for instance). Thus your client can keep calling getCause() to to get to the bottom exception. ODSI converts/replaces the actual exception class with it's own exception class - so that the client doesn't get a de-serialization error attempting to de-serialize a class that it does not have access to.

After adding 2nd WiSM and failing over AP's some apps don't work

We have a dual core made up of 2 6513's. In 6513#1 we have WiSM#1 which we have had for sometime now. We have added a 2nd WiSM in 6513#2 for redundancy purposes also we are going to be re-configuring the WiSM in 6513#1 to more match that of the new WiSM in 6513#2. We have installed the new WiSM and failed over the AP's from 6513#1 so we can re-configure it's WiSM. The failover went great and no issues, with the exception that a web application or two didn't function from wireless clients and users were having issues getting to some mapped drives. The only difference from the new WiSM config vs the old WiSM is that on the old WiSM the AP's were in the same VLAN as the controller management interfaces. Now with the new WiSM it's configuration has the controllers AP mgt interfaces ip addresses in a different VLAN from the AP's, we are doing this based on Cisco best practices. If we revert the AP's back to the original WiSM/controllers the PC's where they are on the same vlan/subnet the applications and shares that were having issues the other way work. We have placed a call with Cisco TAC and they say our configs look good and we even sent them some packet captures and they said everything looks normal. The wireless clients can ping and resolve the server hosting the application database just fine.
Thanks

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Requirements on an EJB to be eligible for a fail-over

Hi all,
          I was reading the EJB developer guide for weblogic server 9.2. When talking about the fail-over feature the guide said
          "EJB failover requiers that bean methods must be idempotent and configured as such in weblogic-ejb-jar.xml"
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          1) Fail overs must be configured
          This is straight forward.
          2) The bean methods must be idempotent.
          I don't really understand this point. Does this suggest that the bean methods should conform to some guide lines? If so what are they?
          Probably these are clarified in some other document or other resources. Being impatient and a little lazy I would love to have this clarified in the forum.
          Thanks in advance,
          - Madhu

Daniel,
I think since this will be the ONLY system that will be running as a DC providing ADDS and the Direct access server, i should follow this advice from the article you sent:
For users who never connect directly to the Contoso intranet or through a VPN, they must use the DirectAccess
Offline Domain Join process to initially join the appropriate domain and configure DirectAccess. When this process
is complete, the users log on normally and have the same experience as if they were directly connected to the Contoso intranet.
Because remember, no user will ever connect directly to the subnet where the server is. so do an offline join First and then start managing.. Only thing im worried about is: they keep saying that the direct access function has significantly improved in windows
8. hmmmmm many systems will be using windows 7 Pro 64Bit. Some windows 8.1 Pro 64bit. should i worry?

NIC not failing Over in Cluster

Hi there...I have configured 2 Node cluster with SoFS role...for VM Cluster and HA using Windows Server 2012 Data Center. Current set up is Host Server has 3 NICS (2 with Default Gateway setup (192.x.x.x), 3 NIC is for heartbeat 10.X.X.X). Configured CSV
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1.
I have created 2 VM Switch for 2 separate Host server (using Hyper-V manager). When I test the functionality by taking Node 2, I can see the Disk Owner node is changing to Node 1, but the VM NIC 2 is not failing over automatically to VM NIC 1 (but I can
see the VM NIC 1 is showing up un-selected in the VM Settings). when I go to the VM Settings > Network Adapter, I get error -
An Error occurred for resource VM "VM Name". select the "information details" action to view events for this resource. The network adapter is configures to a switch which no longer exists or a resource
pool that has been deleted or renamed (with configuration error in "Virtual Switch" drop down menu).
Can you please let me know any resolution to fix this issue...Hoping to hear from you.
VT

Hi,
From your description “My another thing I would like to test is...I also would like to bring a disk down (right now, I have 2 disk - CSV and one Quorum disk) for that 2 node
cluster. I was testing by bringing a csv disk down, the VM didnt failover” Are you trying to test the failover cluster now? If so, please refer the following related KB:
Test the Failover of a Clustered Service or Application
http://technet.microsoft.com/en-us/library/cc754577.aspx
Hope this helps.
We
are trying to better understand customer views on social support experience, so your participation in this
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License Probelm Fail over node.

Dear Gurus,
I am reciving an error while applying the liscense to the fail over server.
SAPLICENSE (Release 700) ERROR ***
ERROR: Can not set DbSl trace function
DETAILS: DbSlControl(DBSL_CMD_IMP_FUNS_SET) failed with return code
20
RC-INFO: error loading dynamic db-library - check environment for:
dbms_type = <db-type> (e.g. ora)
DIR_LIBRARY = <path to db-dll>
(e.g. /usr/sap/SID/SYS/exe/run)
LD_LIBRARY_PATH = <path do db and sap libs>
(e.g. /oracle/SID/lib)
My Production system no is 00000000031XXXXXXX but the license key is for 00000000031XYYYYY.
I am anot able to login to fail over node due to this.
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Sachin

sachin,
how r u applying the license through slicense???
unable to login in failover?? have u deleted the temporary license??? or has it crossed 4 weeks??
if u have deleted the temp license apply the license through visual admin
if it has crossed 4 weeks , revert the date backwards and apply license
u must have applied for a license in oss using other system with same sid,
u have to copy the system number from the node u have applied license on and apply for a license under the same system in the oss and give the system number.
when u get the license apply as mentioned above.

Help regarding how to instantiate the failed over URLS in OWSM gateway.

Hi all,
I am working on a scenario like...
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exact same problem. Any solution out there?

Replicating router partitions for Fail/Over ?

Hi everyone,
Is it really worth the value to replicate a router partition on the same
node ?
In other words, has anyone ever seen a router partition failing on its
own (eg due
to an out of memory), ie not because of the node failure ?
What I am looking for is to avoid wasting system resources for unneeded
replicates.
Thanks.
Vincent Figari

You will use Active/Standby failover method to keep your fail-over configuration in secondary firewall (PIX).
Active/Standby Failover lets you use a standby security appliance to take over the functionality of a failed unit. When the active unit fails, it changes to the standby state while the standby unit changes to the active state. The unit that becomes active assumes the IP addresses (or, for a transparent firewall, the management IP address) and MAC addresses of the failed unit and begins to pass traffic. The unit that is now in standby state takes over the standby IP addresses and MAC addresses. Because network devices see no change in the MAC to IP address pairing, no ARP entries change or time out anywhere on the network. PIX Security Appliance with 7.x version and above supports failover.
For further information click this link.
http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a00807dac5f.shtml#regu

2960 and fail over

I am going to hook a 2960 to a wireless antenna and have a backup T-1 to use for fail-over. Can a 2960 do this function?
Shannon

It could if any of the 2960 have a WAN interface such as T1 but it does not and since it's a switch.

UCCX Purposely Prevent Fail-over

Hi. I was wondering if shutting down the engine on a secondary server would be enough to prevent fail-over in an HA environment.
Basically; we have had a call with TACs on the servers for no apparent reason, failing over and then back. What we found was happening was that the 2 servers were losing heartbeat to each other, so the secondary server was trying to take control. This then cause all of our agents to fail over, but calls could get lost as the primary server actually was fully functioning. This lead us to another TAC case on an error on a router near the secondary server that was causing the loss of heartbeat. Problem is, that router cannot come down for some time and is due to just be replaced at the end of the year.
So now, maybe not entirely to my liking; we/someone wants to try just having the primary running and then if worse comes to worse, we can start the secondary back up again and I am curious what the best procedure to do that would be. Hopes would be that this somehow would at least stop the random fail-overs, even if it doesn't actually address the real issue.

I have to rely on another guy for the router, switches and UCM side of things and he hasn't said exactly what the error message is, but that he called into TACs and it is supposed to only be cosmetic, and a reboot of the router would clear it. Unfortunately, where that router is; it will not be brought down until the end of the year on a maintenance window.
At any rate; the UCCX server has been ruled out as we have had multiple tickets with TACS for the UCCX then to the UCM and they both have been pointing to a network issue that does not get avoided by having the secondary server down, mainly because we do have a CM publisher and subscriber on the same network.

Audio Applications in Unity Fail-over

Hi all,
I am going to install Cisco Unity with fail-over and what I remember, I should to rebuild the applications like Auto Attendant in secondary server. because this is not part of the replication.
Am I right? or no need to rebuild the applications?

Hi JFV,
That is no longer the case
How Standby Redundancy Works in Cisco Unity 8.x
Cisco Unity standby redundancy uses failover functionality to provide duplicate Cisco Unity servers for disaster recovery. The primary server is located at the primary facility, and the secondary server is located at the disaster-recover facility.
Standby redundancy functions in the following manner:
•Data is replicated to the secondary server, with the exceptions noted in the "Data That Is Not Replicated in Cisco Unity 8.x" section.
•Automatic failover is disabled.
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Data That Is Not Replicated in Cisco Unity 8.x
Changes to the following Cisco Unity settings are not replicated between the primary and secondary servers. You must manually change values on both servers.
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http://www.cisco.com/en/US/docs/voice_ip_comm/unity/8x/failover/guide/8xcufg040.html#wp1099338
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Rob

SQL Server 2014 Always on HA takes 8-14 seconds to fail over. Application side timeouts occur

Hi All,
I have a very similar post in the SQL Server 2014 forums too (https://social.technet.microsoft.com/Forums/sqlserver/en-US/adb5e338-907e-4405-aa62-d3ea93c7a98a/sql-server-2014-always-on-ha-takes-814-seconds-to-fail-over-application-side-timeouts-occur?forum=sqldisasterrecovery) -
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SQL Server Nodes, 2014 (12.0.2480.0)
1 Share witness (on separate subnet)
1 Cluster
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I have been testing the response time to failovers – both manual (right-click, fail over in SSMS) and Automatic (shut down the primary host). The way I am testing response is to have a SSMS query running on my desktop, connected to the listener querying
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The Query response time, from execute to receiving the result, has been between 8 and 14 seconds based on my testing. My previous experience (in a separate environment) showed around 2 second fail over times in a very similar configuration.
Availability DB is 200Mb and is not actively used. The nodes are synchronised.
SQL Server Hosts: Windows 2012, 2 cpu, 8gb RAM.
Questions:
1: It’s a big question but what should I expect for a ‘normal’ fail over time. Keep in mind this scenario is about as simple as it gets.
2: As it stands an 8 to 14 second ‘outage’ could cause some applications to time out. Or am I being un-reasonable? I am seeing the very simple query in SSMS to time out with this:
Msg 983, Level 14, State 1, Line 2
Unable to access availability database 'DATABASE' because the database replica is not in the PRIMARY or SECONDARY role. Connections to
an availability database is permitted only when the database replica is in the PRIMARY or SECONDARY role. Try the operation again later.
Cluster logs are long - this section accounts for 8 seconds of the 11 second outage I experienced. I can supply the full log if required. Also this log is just the 2 cluster nodes, I removed the witness share to make sure it was as simple as possible.
00001090.00002128::2015/02/25-03:05:08.255 INFO [GEM] Node 2: Deleting [1:65 , 1:71] (both included) as it has been ack'd by every node
00001ee4.00002130::2015/02/25-03:05:10.107 INFO [RES] Network Name: Agent: Sending request Netname/RecheckConfig to NN:5b81e7bd-58fe-4be9-a68a-c48ba2aa552b:Netbios
00001090.00002128::2015/02/25-03:05:11.888 INFO [GEM] Node 2: Deleting [1:72 , 1:73] (both included) as it has been ack'd by every node
00001090.00002698::2015/02/25-03:05:11.889 INFO [GUM] Node 2: Processing RequestLock 2:49
00001090.00002128::2015/02/25-03:05:11.890 INFO [GUM] Node 2: Processing GrantLock to 2 (sent by 1 gumid: 67)
00001090.00002698::2015/02/25-03:05:11.890 INFO [GUM] Node 2: executing request locally, gumId:68, my action: /dm/update, # of updates: 1
00001090.00002128::2015/02/25-03:05:12.890 INFO [GEM] Node 2: Deleting [1:74 , 1:74] (both included) as it has been ack'd by every node
00001ee4.00002130::2015/02/25-03:05:15.107 INFO [RES] Network Name: Agent: Sending request Netname/RecheckConfig to NN:5b81e7bd-58fe-4be9-a68a-c48ba2aa552b:Netbios
00001090.00002128::2015/02/25-03:05:16.988 INFO [GUM] Node 2: Processing RequestLock 1:28
Thanks in advance.
Keegan

Hi Keegan,
From these event log , what I can see is "Sending request Netname" wasted the time .
Could you please tell us the network configuration of that cluster nodes ?
If I recall correctly , it is recommended to only remain Tcp/IP protocol and disable NetBIOS over TCP/IP for "Private Network" , also do not configure DNS/Wins default gateway for "Private Network" :
https://support.microsoft.com/kb/258750?wa=wsignin1.0
After that please test again .
Best Regards,
Elton JI
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Front End pool failed over

Hi all,
1. I setup a pool with three Front End servers (FQDN of pool is pool.site1.sip96x2.com and it's pointed to IP address of three Front End servers). Everything works fine. But When I disable network interface on FE1 and FE2, the Lync clients are disconnected.
I haven't understood clearly how the Lync clients failed over in a pool? Please clarify to me.
2. I have two central site (Root site and Primary site, they have different domain sip96x2.com and site1.sip96x2.com). The simple URL dialin is pointed to Front End server at Root site. So if the link between Root site and Primary site is down, how can the
users at Primary site connect to dialin URL?
3. In building topology for Front End pool, I checked Override FQDN internal web service and the FQDN is "poolint.site1.sip96x2.com". I created three A records "poolint.site1.sip96x2.com" and pointed to three IP addresses of Front End
servers. Is it right?
Thanks so much!

Ah ok, well first thing if I am reading this correctly, pool pairing Standard with Enterprise is not supported. You should only pair Standard with Standard and Enterprise with Enterprise (even though topology builder won't stop you) Take a look here for
support scenarios http://technet.microsoft.com/en-us/library/jj204697.aspx
To deal with the simple URLs in the event of failover you need to add them using Powershell. Take a look at this article which explains and gives an example: http://blogs.perficient.com/microsoft/2012/01/configuring-simple-urls-for-multiple-lync-pools/
If this helped you please click "Vote As Helpful" if it answered your question please click "Mark As Answer"
Georg Thomas | Lync MVP
Blog www.lynced.com.au | Twitter
@georgathomas
Lync Edge Port Check (Beta)

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. "
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"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

Is it possible to add hyper-V fail over clustering afterwards?

Hi,
We are testing Windows 2012R2 Hyper-V using only one stand alone host without fail over clustering now with few virtual machines. Is it possible to add fail over clustering afterwards and add second Hyper-V node and shared disk and move virtual
machines there or do we have to install both nodes from scratch?
~ Jukka ~

Hi Jukka,
Inaddition, before you build hyper-v failover cluster please refer to these requirements within the article below :
http://technet.microsoft.com/en-us/library/jj863389.aspx
Best Regards
Elton Ji
We
are trying to better understand customer views on social support experience, so your participation in this
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Fail-over functions

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