Failover scenerio

Hi
Assume, maximum performance mode, and no standby redologs.
Let say my primary database is crashed and my redologs is half-filled.
I have decided to failover, since current log is not being archived in primary database, I will lose data if I open standby database.
If I copy the redologs from primary to standby, can I apply them to standby database?

Hi Scofiled,
According to oracle documentation maximum performance mode writes redo to standby databases but asynchrous.
Maximum Performance
This protection mode provides the highest level of data protection that is possible without affecting the performance of a primary database. This is
accomplished by allowing transactions to commit as soon as all redo data generated by those transactions has been written to the online log. Redo> data is also written to one or more standby databases, but this is done asynchronously with respect to transaction commitment, so primary database
performance is unaffected by delays in writing redo data to the standby database(s).
This protection mode offers slightly less data protection than maximum availability mode and has minimal impact on primary database performance.
This is the default protection mode.If I copy the redologs from primary to standby, can I apply them to standby database?
With a mirrored setup you should copy the controlfiles and all the redologs to be able to apply redo.
Regards,
Tycho

Similar Messages

DB2 HADR Failover Scenerio

Hi,
We have set up HADR.
Primary -> Production Server
Standby -> DR Server
My Question is, for example if there is a temporary OS problem in my Production Server and the OS Crashed, I will make the Standby DB, the Primary, BY FORCE.
After the OS Problem is solved. I start db2 and activate the database. After that can I make the original Primary db, the Standby to join the HADR pair by issuing - START HADR ON DB SEP AS STANDBY ?
If YES, How is that possible? Because as far as I know the DB has to be in "Rollforward Pending" state to become the Secondary. And our original Primary DB will never be in that Roll Forward Pending state.
If NO, what should be the approach to handle this kind of scenerios?
Thanks!

The two databases in a HADR pair are just that, a pair and they know that each other exist. Assuming they are in a peer state it is possible to switch the role of each database from primary to secondary and back again without any need for a restore. A restore would only be required if your Primary DB was lost and the secondary become primary 'by force' and went into productive operation. In this case you would have to rebuild the original primary by backup and restore (of the new primary), re-link or reconfigure HADR, then do a planned switch of the roles so they back to their original role.
[There is an IBM red book with vast amounts of information on HADR|http://www.redbooks.ibm.com/abstracts/sg247363.html]. Download it, it should answer any questions you have.
Red Book has the following to say on planned switching of database roles ->
Switching roles is only done from the standby when the databases are in the
Peer state. The TAKEOVER command fails if the databases are in any other
tate.
The takeover procedure is simply issuing the TAKEOVER HADR command.
For example, issue the takeover command on the standby database using the
following command:
db2 takeover hadr on database sample
After issuing the TAKEOVER HADR command from the standby, the following
steps are carried out in the background:
1. Standby tells the primary that it is taking over.
2. Primary forces off all client connections and refuses new connections.
3. Primary rolls back any open transactions and ships the remaining log, up to
end of the log, to standby.
4. Standby replays received log, up to end of the log.
5. Primary becomes the new standby.
6. Standby becomes the new primary.
Setup a pair of test databases and try all this out, you will find HADR a surprisingly easy to use db replication tool.
Good luck
Daniel

Migrating Dimension Server from local installation to High Availability

Hi Team,
When Hyperion was installed on the client site (11.1.2.3), there was no requirement for EPMA to become highly available.
Now that has become a requirement to make it highly available in the event that one of the virtual machine is unreachable.
In the event that a server becomes unavailable, it is acceptable for a manual failover procedure to be done.
What steps can be taken to prepare for such an event?
Possible outcome:
Configure another dimension server on the second Virtual machine and leave it manually switched off.
Modify the IIS path to point to a clustered location accessible by both machines.
In the event of a failover, manually bring up the dimension server on the other machine.
This is yet to be implemented successfully.
Current Scenerio:
1 x Windows Machine hosting:
Foundation Services
Calculation Manager
Performance Architect
Planning
Reporting and Analysis
Repository location on a shared mount (Clustered filesystem)
FDQM
Essbase
Analytic Provider Services
Essbase Integration Services (not used)
Essbase Studio (not used)
1 x Linux Machine
Essbase Server
Arborpath on a shared mount
Aim: Add 2 new Virtual Machines ( 1 x Windows App Server + 1 x Linux Essbase Server) for high availability.
Progress:
Windows Machine components clustered:
Foundation Services
Calculation Manager
Planning
Reporting and Analysis
Essbase
Analytic Provider Services
Linux Essbase Machines:
Configured Active/Passive using OPMN
Challenge faced:
Failover scenerio can be a manual list of steps to provide functionaility.
Please provide support on introducing failover steps for dimension server.

Remote Desktop/Preferences/Task Server
Add the FQDN or I.P address of your server in this pane on your book(basically your pointing your book to your installed software on the other machine). Setup your server with the installs you want it to make, and administer it via your book (or any machines with another unlimited ARD) IF you want report generation, you would schedule the clients to send the info to the server. A task server can only do 2 things, install packages or change client settings, thats it.

Redundancy over WAN

Do Cisco expressway C and E support redunancy over WAN (Across data center) for increasing capacity as well as failover scenerios.
thanks

The Expressway-Edge and Expressway-Core is the same software as the VCS-Expressway and VCS-Control, just pacakaged for CUCM registered endpoints - so the same principles apply.
As Jens mentioned, each peer in a cluster needs to be within a 15ms hop (30ms round trip delay) of each and every other VCS in the cluster.
This is mentioned in the Prerequisites section of the Cluster Creation and Maintenance Deployment Guide (4th dot point on Page 5).
Wayne
Please remember to rate responses and to mark your question as answered if appropriate.

How to implement Failover in VPN Router

Hi Everyone,
I have got Cisco 3845 VPN router which is currently running in our network. We have purchased one more Cisco 3845 router as a standby for VPN router.
I am planning to make the new router as a secondary router which should be connected on LIVE network. If primary router fails, secondary router should run automatically after certain period of time.
When i was looking for such kind of solution i came across of Implementing FAILOVER and LOAD BALANCING method for such kind of scenerio. As i am new to this kind of method, so i would suggest some help from the experts out here.
How do i implement Failover and Load Balancing with my TWO Cisco 3845 VPN router?
Helping hands are highly appreciated...
Thanks,
TashiBDFCL

hi ,
Please refere below link to get things clear.....
https://sites.google.com/site/amitsciscozone/home/security/load-balancing-with-2-isps
thanks

IOS SLB and Stateless failover

Trying to compare CSM and IOS SLB features. Read where the CSM can have "stateful" failover (maintains sessions) in a box-to-box scenerio. I also read where the IOS SLB can only provide "stateless" failover (I assume during failover, state/connection information is lost) using HSRP.
Can anyone confirm what I have written?
Your help is much appreciated.

That is correct.
The CSM can maintain state on connections on a failover using the "replicate csrp" command. This command is not available on IOS SLB.
The following are links to the CSM commands and IOS SLB commands for your reference...
CSM Config guide, release notes and commands:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/cfgnotes/csm_3_1/index.htm
IOS SLB commands: http://www.cisco.com/en/US/customer/products/sw/iosswrel/ps1835/products_command_summary_chapter09186a008008805e.html
IOS SLB config guide:
http://www.cisco.com/en/US/customer/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a00800ca75d.html
hope that helps
-Steve

In oracle rac, If user query a select query and in processing data is fetched but in the duration of fetching the particular node is evicted then how failover to another node internally?

In oracle rac, If user query a select query and in processing data is fetched but in the duration of fetching the particular node is evicted then how failover to another node internally?

The query is re-issued as a flashback query and the client process can continue to fetch from the cursor. This is described in the Net Services Administrators Guide, the section on Transparent Application Failover.

Reporting Services as a generic service in a failover cluster group?

There is some confusion on whether or not Microsoft will support a Reporting Services deployment on a failover cluster using scale-out, and adding the Reporting Services service as a generic service in a cluster group to achieve active-passive high
availability.
A deployment like this is described by Lukasz Pawlowski (Program Manager on the Reporting Services team) in this blog article
http://blogs.msdn.com/b/lukaszp/archive/2009/10/28/high-availability-frequently-asked-questions-about-failover-clustering-and-reporting-services.aspx. There it is stated that it can be done, and what needs to be considered when doing such a deployment.
This article (http://technet.microsoft.com/en-us/library/bb630402.aspx) on the other hand states: "Failover clustering is supported only for the report server database; you
cannot run the Report Server service as part of a failover cluster."
This is somewhat confusing to me. Can I expect to receive support from Microsoft for a setup like this?
Best Regards,
Peter Wretmo

Hi Peter,
Thanks for your posting.
As Lukasz said in the
blog, failover clustering with SSRS is possible. However, during the failover there is some time during which users will receive errors when accessing SSRS since the network names will resolve to a computer where the SSRS service is in the process of starting.
Besides, there are several considerations and manual steps involved on your part before configuring the failover clustering with SSRS service:
Impact on other applications that share the SQL Server. One common idea is to put SSRS in the same cluster group as SQL Server. If SQL Server is hosting multiple application databases, other than just the SSRS databases, a failure in SSRS may cause
a significant failover impact to the entire environment.
SSRS fails over independently of SQL Server.
If SSRS is running, it is going to do work on behalf of the overall deployment so it will be Active. To make SSRS Passive is to stop the SSRS service on all passive cluster nodes.
So, SSRS is designed to achieve High Availability through the Scale-Out deployment. Though a failover clustered SSRS deployment is achievable, it is not the best option for achieving High Availability with Reporting Services.
Regards,
Mike Yin
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Not getting attribute values in IPC routines Scenerio R/3 B2B using AP 7.0

Hi,
Our Scenerio is using ISA R/3 B2B using AP 7.0. I have developed IPC routines but when i debug my routines in SM53 I notice that I'm not getting any attribute value except for VKORG.
I'm pasting the code below. Please help me if I have to implement some BADI or do something more to get the attribute values.
I have defined the attributes properly in Routine assignment in tcode /n/sapcnd/ueass
userexitlogger.writeLogDebug("*requirment 901*" + "Plant = "plant"||ANZ_MONATE ="+ item.getAttributeValue(ANZ_MONATE_STR).toString()"||ANZ_JAHRE="item.getAttributeValue(ANZ_JAHRE_STR).toString()"||MATKL="item.getAttributeValue(MATKL_STR).toString()"||PSTYV="item.getAttributeValue(PSTYV_STR).toString()"||VKORG="item.getAttributeValue(VKORG_STR)"||PRSFD="item.getAttributeValue(PRSFD_STR)"||MVGR2="item.getAttributeValue(MVGR2_STR).toString()"||PRSDT="item.getAttributeValue(PRSDT_STR).toString()"||AUDAT="item.getAttributeValue(AUDAT_STR).toString());
I would reward points for help
Many Thanks n regards,
Dipender

I would like to go through each Value of the xml file and give each Value a name
e.g. from the xml file <VentCount Value=1> Retreive the value above and giving it the name VentCount. Then I would beable to use the name vent count as follows:
setVentCount() //My own method can use as follows: setVentCount(VentCount); I would like to do his for ever value, each value with a specific name

What is solution of nat failover with 2 ISPs?

Now I have lease line link to 2 ISPs for internet connection. I separate packets of users by accesslist such as www go to ISP1 and mail or other protocol go to ISP2 . Let's say link go to ISP1 down I need www traffics failover to ISP2 and vice versa.
Problem is acl on nat statement?
If you config about this.
access-l 101 permit tcp any any www -->www traffic to ISP1
access-l 101 permit tcp any any mail --> back up for mail packet to ISP2 down
access-l 102 permit tcp any any mail -->mail packet to ISP2
access-l 102 permit tcp any any www --> back up for www traffic go to ISP2
ip nat inside source list 101 interface s0 overload
ip nat inside source list 102 interface s1 overload
In this case is links of ISP1 and ISP2 are UP.
when you apply this acl on nat statement then nat will process each statement in order( if I incorrect please correct me) so mail traffics will match in this acl and then nat with ip of ISP1 only.
please advice solution about this
TIA

Hi,
If you have two serial links connecting to two diff service provider , then you can try this .
access-l 101 permit tcp any any www
access-l 102 permit tcp any any mail
route-map isp1 permit 10
match ip address 101
set interface s0
route-map isp2 permit 10
match ip address 102
set interface s1
ip nat inside route-map isp1 interface s0 overload
ip nat inside source route-map isp2 interface s1 overload
ip nat inside source list 103 interface s0 overload
ip nat inside source list 104 interface s1 overload
ip route 0.0.0.0 0.0.0.0 s0
ip route 0.0.0.0 0.0.0.0 s1 100
In case if any of the link fails , automatically the other traffic would prefer the other serial.
I have not tried the config , just worked out the config on logic .pls go through and try if possible
pls see the note2 column
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080093fca.shtml#related
Hope it helps
regards
vanesh k

Advice Requested - High Availability WITHOUT Failover Clustering

We're creating an entirely new Hyper-V virtualized environment on Server 2012 R2. My question is: Can we accomplish high availability WITHOUT using failover clustering?
So, I don't really have anything AGAINST failover clustering, and we will happily use it if it's the right solution for us, but to be honest, we really don't want ANYTHING to happen automatically when it comes to failover. Here's what I mean:
In this new environment, we have architected 2 identical, very capable Hyper-V physical hosts, each of which will run several VMs comprising the equivalent of a scaled-back version of our entire environment. In other words, there is at least a domain
controller, multiple web servers, and a (mirrored/HA/AlwaysOn) SQL Server 2012 VM running on each host, along with a few other miscellaneous one-off worker-bee VMs doing things like system monitoring. The SQL Server VM on each host has about 75% of the
physical memory resources dedicated to it (for performance reasons). We need pretty much the full horsepower of both machines up and going at all times under normal conditions.
So now, to high availability. The standard approach is to use failover clustering, but I am concerned that if these hosts are clustered, we'll have the equivalent of just 50% hardware capacity going at all times, with full failover in place of course
(we are using an iSCSI SAN for storage).
BUT, if these hosts are NOT clustered, and one of them is suddenly switched off, experiences some kind of catastrophic failure, or simply needs to be rebooted while applying WSUS patches, the SQL Server HA will fail over (so all databases will remain up
and going on the surviving VM), and the environment would continue functioning at somewhat reduced capacity until the failed host is restarted. With this approach, it seems to me that we would be running at 100% for the most part, and running at 50%
or so only in the event of a major failure, rather than running at 50% ALL the time.
Of course, in the event of a catastrophic failure, I'm also thinking that the one-off worker-bee VMs could be replicated to the alternate host so they could be started on the surviving host if needed during a long-term outage.
So basically, I am very interested in the thoughts of others with experience regarding taking this approach to Hyper-V architecture, as it seems as if failover clustering is almost a given when it comes to best practices and high availability. I guess
I'm looking for validation on my thinking.
So what do you think? What am I missing or forgetting? What will we LOSE if we go with a NON-clustered high-availability environment as I've described it?
Thanks in advance for your thoughts!

Udo -
Yes your responses are very helpful.
Can we use the built-in Server 2012 iSCSI Target Server role to convert the local RAID disks into an iSCSI LUN that the VMs could access? Or can that not run on the same physical box as the Hyper-V host? I guess if the physical box goes down
the LUN would go down anyway, huh? Or can I cluster that role (iSCSI target) as well? If not, do you have any other specific product suggestions I can research, or do I just end up wasting this 12TB of local disk storage?
- Morgan
That's a bad idea. First of all Microsoft iSCSI target is slow (it's non-cached @ server side). So if you really decided to use dedicated hardware for storage (maybe you do have a reason I don't know...) and if you're fine with your storage being a single
point of failure (OK, maybe your RTOs and RPOs are fair enough) then at least use SMB share. SMB at least does cache I/O on both client and server sides and also you can use Storage Spaces as a back end of it (non-clustered) so read "write back flash cache
for cheap". See:
What's new in iSCSI target with Windows Server 2012 R2
http://technet.microsoft.com/en-us/library/dn305893.aspx
Improved optimization to allow disk-level caching
Updated
iSCSI Target Server now sets the disk cache bypass flag on a hosting disk I/O, through Force Unit Access (FUA), only when the issuing initiator explicitly requests it. This change can potentially improve performance.
Previously, iSCSI Target Server would always set the disk cache bypass flag on all I/O’s. System cache bypass functionality remains unchanged in iSCSI Target Server; for instance, the file system cache on the target server is always bypassed.
Yes you can cluster iSCSI target from Microsoft but a) it would be SLOW as there would be only active-passive I/O model (no real use from MPIO between multiple hosts) and b) that would require a shared storage for Windows Cluster. What for? Scenario was
usable with a) there was no virtual FC so guest VM cluster could not use FC LUs and b) there was no shared VHDX so SAS could not be used for guest VM cluster as well. Now both are present so scenario is useless: just export your existing shared storage without
any Microsoft iSCSI target and you'll be happy. For references see:
MSFT iSCSI Target in HA mode
http://technet.microsoft.com/en-us/library/gg232621(v=ws.10).aspx
Cluster MSFT iSCSI Target with SAS back end
http://techontip.wordpress.com/2011/05/03/microsoft-iscsi-target-cluster-building-walkthrough/
Guest
VM Cluster Storage Options
http://technet.microsoft.com/en-us/library/dn440540.aspx
Storage options
The following tables lists the storage types that you can use to provide shared storage for a guest cluster.
Storage Type
Description
Shared virtual hard disk
New in Windows Server 2012 R2, you can configure multiple virtual machines to connect to and use a single virtual hard disk (.vhdx) file. Each virtual machine can access the virtual hard disk just like servers
would connect to the same LUN in a storage area network (SAN). For more information, see Deploy a Guest Cluster Using a Shared Virtual Hard Disk.
Virtual Fibre Channel
Introduced in Windows Server 2012, virtual Fibre Channel enables you to connect virtual machines to LUNs on a Fibre Channel SAN. For more information, see Hyper-V
Virtual Fibre Channel Overview.
iSCSI
The iSCSI initiator inside a virtual machine enables you to connect over the network to an iSCSI target. For more information, see iSCSI
Target Block Storage Overviewand the blog post Introduction of iSCSI Target in Windows
Server 2012.
Storage requirements depend on the clustered roles that run on the cluster. Most clustered roles use clustered storage, where the storage is available on any cluster node that runs a clustered
role. Examples of clustered storage include Physical Disk resources and Cluster Shared Volumes (CSV). Some roles do not require storage that is managed by the cluster. For example, you can configure Microsoft SQL Server to use availability groups that replicate
the data between nodes. Other clustered roles may use Server Message Block (SMB) shares or Network File System (NFS) shares as data stores that any cluster node can access.
Sure you can use third-party software to replicate 12TB of your storage between just a pair of nodes to create a fully fault-tolerant cluster. See (there's also a free offering):
StarWind VSAN [Virtual SAN] for Hyper-V
http://www.starwindsoftware.com/native-san-for-hyper-v-free-edition
Product is similar to what VMware had just released for ESXi except it's selling for ~2 years so is mature :)
There are other guys doing this say DataCore (more playing for Windows-based FC) and SteelEye (more about geo-cluster & replication). But you may want to give them a try.
Hope this helped a bit :)
StarWind VSAN [Virtual SAN] clusters Hyper-V without SAS, Fibre Channel, SMB 3.0 or iSCSI, uses Ethernet to mirror internally mounted SATA disks between hosts.

No data in ecc variables in failover mode

Hi all,
got a problem with custom enterprise data layout when CAD is connected to secondary node.
With "set enterprise..." I set a special layout for CAD enterprise data in my script. This works fine as long as CAD is connected to primary node. When CAD is connected to secondary node there is no data in expanded call variales and CAD displays default layout. Changing default layout and writing the content to predefined variables works fine. So it seems only extended call variables are not working in failover mode.
Any ideas?
Br
Sven
(UCCX v8.5)

Hi Sven,
Looks like TAC helped fix the issue. Previously we had rebooted both servers without success. TAC suggested to restart the Desktop Enterprise Service on both servers (I did Pub first than Sub). I've verified ECC variables are being sent to CAD correctly.
The root cause might of been a network outage we had a week ago. We were using the Desktop Workflow Administrator at the time of the outage.
Kyle

Difference between scalable and failover cluster

Difference between scalable and fail over cluster

A scalable cluster is usually associated with HPC clusters but some might argue that Oracle RAC is this type of cluster. Where the workload can be divided up and sent to many compute nodes. Usually used for a vectored workload.
A failover cluster is where a standby system or systems are available to take the workload when needed. Usually used for scalar workloads.

Install Guide - SQL Server 2014, Failover Cluster, Windows 2012 R2 Server Core

I am looking for anyone who has a guide with notes about an installation of a two node, multi subnet failover cluster for SQL Server 2014 on Server Core edition

Hi KamarasJaranger,
According to your description, you want configure a SQL Server 2014 Multi-Subnet failover Cluster on Windows Server 2012 R2. Below are the whole steps for the configuration. For the detailed steps about the configuration, please download
and refer to the
PDF file.
1.Add Required Windows Features (.NET Framework 3.5 Features, Failover Clustering and Multipath I/O).
2.Discover target portals.
3.Connect targets and configuring Multipathing.
4.Initialize and format the Disks.
5.Verify the Storage Replication Process.
6.Run the Failover Cluster Validation Wizard.
7.Create the Windows Server 2012 R2 Multi-Subnet Cluster.
8.Tune Cluster Heartbeat Settings.
9.Install SQL Server 2014 on a Multi-Subnet Failover Cluster.
10.Add a Node on a SQL Server 2014 Multi-Subnet Cluster.
11.Tune the SQL Server 2014 Failover Clustered Instance DNS Settings.
12.Test application connectivity.
Regards,
Michelle Li

Mounted Volume not shwoing up with Windows 2012 R2 failover cluster

Hi
We configured some drives as mounted volumes and configured it with Failover cluster. But it's not showing up the mounted volume details with Cluster Manager, it's showing the details as seen below
Expect support from someone to correct this issue
Thanks in advance
LMS

Hi LMS,
Are you doubt about the disk shown as GUID? Cluster Mount point Disk is showing as a Volume GUID in server 2012 R2 Failover Cluster I creating a mountpoint inside the cluster
and had the same behavior, instead of mount point name we had the volume GUI after volume label, that must by design.
How to configure volume mount points on a Microsoft Cluster Server
http://support.microsoft.com/kb/280297
I’m glad to be of help to you!
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 Support, contact [email protected]

Failover scenerio

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