Disaster Recovery site failover

Hi all
Can someone please assist me, im trying to setup a failover between my primary site and my DR site. I have attached a network connectivity diagram any help you can give me is greatly appreciated.
With Thanks

You are best discussing the licensing implications with your Oracle account manager rather than posting here as it is only via that route that you will get a defnitive answer applicable to your specific companies contractual agreements with Oracle.

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Synchronizing Disaster Recovery site with the production server

Hi All,
One of the customer is asking the following query:
"How Disaster recovery site can be synchronized with the production server and how do they switch? Will the web logic server do this for them?"
This customer is having two sites one live and one a DR (Disaster Recovery) site on different location.
Can somebody answer my query?
Thanks in advance.,
Regards.,
Naveen

Firstly
Is your Datagaurd Physical( Redo Apply) or Logical( SQL apply)?
Does it have Datagaurd Broker?
When Datagaurd is setup in your environment - on the primary database( live database) the Datagaurd users LGWR or/and ARCH process to collect redo data and ship this data to standby ( DR site) and the FAL process to provide client-server mechanism for shipping archived logs to standby.
On standby database, The Datagaurd users RFS process to receive redo records from primary database, the MRP process applies redo information to standby database.
If the Data Gaurd Broker is enabled, Datagaurd also used DMON process to manage and monitor both primary and standby databases as a unified configuration.
When there is any connectivity issue to the standby and when connection is re-established, the accumulated archive logs are automatically shipped and apploed to stanby, until stanby is resynchronized with the primary. This process does not require any administrative intervention.
If there is a very large Archive Gap between the primary and secondary due to some major issue. Then the unshipped archive logs need to be shipped manually from primary to standby and needs to be applied in standby to sync up with primary. For some reason there will also arise rare issues like problem with not applying of archive logs though log shipping is success. So some work arround will solve it.
Comming to planned /unplanned outages of production site.
Datagaurd has Failover and Switchover( planned ) methods, These are not automatic, but have to be explicitly initiated by the administrator( So there will be downtime but minimal). Once initiated, Datagaurd automates the processes involved.
- S K A
Edited by: user12297346 on Jan 27, 2010 7:13 AM

Planning Disaster Recovery Site for SAP ERP ECC 6.0

Dear All,
I am planning for DR ( Disaster Recovery ) Site. Our current environment is
Production Site
OS        : AIX 5.3
DB        : IBM DB2      version 8.2
SAP      : SAP ERP 6.0 ECC 6
Disaster Recovery Site
OS        : AIX 6.1
DB        : IBM DB2      version 9.5
SAP      : SAP ERP 6.0 ECC 6
I have following confusion in planning the solution.
1 - If I export the data at db level from production site and import that data in DR Site ... than DR Site will be equivalent to Production Site or not.
2 - if answer of point 1 is yes then for SAP DR ... HADR is the best solution or there is any other better solution exist.
regards
Syed Saifuddin

Hello Syed,
If you export from the prod db and import into the disastor recover db then they will be the same provided that SAP environment is all the same. I would recommend that you update the prod side to the same db2 release and fixpack level as soon as possible though as 9.5 (or even better 9.7) has some advanced features that make administration alot easier and save much space.
HADR would be the best setup for disaster recovery in db6 environment.
Check the following documentation which should answer most of your queries.
SAP Note 960843 # DB6:Installation SA MP
"High Availability and Disaster Recovery Options for DB2 on Linux, UNIX,
and Windows"
http://www.redbooks.ibm.com/redbooks/pdfs/sg247363.pdf
"Data Recovery and High Availability Guide and Reference"
http://publibfp.boulder.ibm.com/epubs/pdf/c1042280.pdf
Please update if questions remain unanswered.
Regards,
Paul

Best Way to setup a disaster Recovery site for a logical standby database

I have a logical standby DB (L1DB) as a reporting db on the same machine as the primary (P1DB). We are planning on building a disaster recovery site with similar hardware and potentially have disk mirroring of atleast the redo log files.
The DR site can hold an additional physical standby (S1DB) for the primary (P1DB). I am trying to understand what would be the best way to setup the Disaster Recovery site for the L1DB logical stdby. Ideally, when the disaster happens, and I no longer have P1DB and L1DB, I should be able to switch to S1DB as the new primary. But how do I setup to have a L2DB that takes the place of L1DB and has its contents and can be setup as a logical standby of S1DB?

If you already setup one logical standby, then you know how it works, so not sure what question you are asking ?
Personally I would setup L2DB as a standby of the original primary P1DB. Having downstream standby databases complicates things, and adds additional lag between primary transaction time and L2DB apply.

Fusion Middleware, Disaster Recovery Sites with Oracle Applications

I have oracle applications EBS R12.x.x deployed with one disaster recovery site. I have some composite applications built on SOA 11g suite deployed at OFM which is taking care of my EBS R12.x.x (not disaster recovery site) instance. When my EBS R12.x.x down, is it possible that services deployed at OFM starts taking care of my disaster recovery site.
Regards

There really aren't any stupid questions, just dumb answers :-)
Have taken a look at B/R section in Admin Guide?
For 10.1.3.x refer this:
http://download.oracle.com/docs/cd/B32110_01/core.1013/b32196/part5.htm#i436649
For 10.1.2.x refer this:
http://download.oracle.com/docs/cd/B14099_19/core.1012/b13995/part5.htm#i436649
Hope this will help.
Thanks
Shail

MaxDB disaster Recovery site setup

Hello Experts
We are hosting SAP apllication in our datacentre. For one of our customer we need Disaster Recovery site. As planned by our maneegment we are going to have a DR centre at some other location. Our DC and DR are connected by suffcient link.
My SAP Instance is running ion MaxDB database and RHEL5. Can you please suggest me how I should look forward to set up the DR site?
Can I setup a SAP server in my DR site with same SID server will restore the initial backup from DC and then go for log mirroring? In this case I will have to install SAP system with same SID? IP address?

There are several possibilities to approach your goal, for a start check
Note 952783 - FAQ: MaxDB high availability
It has a nice comparison of the different possibilities.
Markus

Disaster Recovery site for Exchange 2013

Hi, I have to build DR site with Exchange 2013 environment and unable to see document for Exchange 2013 perspective.
In new environment will contain 10 CAS/MBS co-located servers in primary datacenter with two mailbox copies and disaster recovery site with 5 Exchange 2013 CAS/MBS co-located servers with one database copy in blocked activation mode. Any document related
to this screnario would be helpful. The required solution is when all the servers in PDC goes down then DR site would be activated at DMZ level and Server level. Can I use same IP subnet/Site for the DR site?

Hi,
Yes, you can use the same subnet for DR site. If you use the same subnet, you need to use stretched VLAN.
Here is a related thread for your reference. (This case is for Exchange 2010, but it also applies to Exchange 2013 DAG deployment)
http://social.technet.microsoft.com/Forums/exchange/en-US/80ca452f-f950-4496-83e8-3067d571bb57/exchange-2010-dag-across-sites-different-subnets-vs-stretched-vlan?forum=exchangesvravailabilityandisasterrecovery
Best regards,
Belinda Ma
TechNet Community Support

Need recommentation to setup Disaster recovery site

Hi All,
1.What are the basic things we need to analyze before we recommend the business to go for oracle Dataguard for DR setup?
2. Do you know any technology that will replicate the schema from one datacenter[one primary database ] to another datacenter [secondary or replication database]?
3. What are the various option to configure the disaster recovery plan at schema level?
Thanks

Hello;
1.What are the basic things we need to analyze before we recommend the business to go for oracle Dataguard for DR setup?Network - bandwidth requirements. How much Redo do you generate? How far away is the standby site? ( proposed network bandwidth and latency )
Power - UPS requirements ( how will you monitor the standby site )
RMAN requirements - Where would you backup? At the primary site or the standby site? If Standby what is the cost of extra equipment? How far away should the standby site be?
Business needs for data ( 24/7, 6 to 6 Monday - Friday etc ) This would help determine a possible protection mode and what switchover failover options you might need.
Allowed downtime if any ( patches, upgrades etc)
How much data loss can be tolerated if you have network, hardware issues? For Primary site? If standby site is lost?
The idea is to develop a plan that meets your business needs.
2. Do you know any technology that will replicate the schema from one datacenter[one primary database ] to another datacenter [secondary or replication database]?Data Guard Logical Standby since you pick what you want to apply
Data Pump will also work
3. What are the various option to configure the disaster recovery plan at schema level?Going to depend upon how much protect the business requires. If all you want is a copy then Data Pump might work.
If you require zero data loss then Data Guard is the way to go.
Frankly I would not use a Logical Standby, I would use a physical standby so I could switchover.
A Logical Standby is a nice idea, but a physical gives you an exact copy and I believe is much easier to maintain.
Best Regards
mseberg

RAC at Disaster Recovery site?

HI
I am having two node RAC production database right now. Now i want to implement disaster recovery using oracle data guard and for that also i am planning to go for 2 node RAC. Is it possible to implement two node RAC at disaster recover site. If yes then please send me link for the document that is related to this implementation.
DB Version:10.2.0.1
OS:LINUX
Thank You....

hi,
yes its similar to normal stanby crearttion
http://www.oracle.com/technology/deploy/availability/pdf/MAA_WP_10g_RACPrimaryRACPhysicalStandby.pdf
http://www.dba-oracle.com/real_application_clusters_rac_grid/single_instance.htm
regards,
Deepak

Recovering Archivedlogs on a disaster recovery site

DBA's need you help.
I have oracle 9i standard edition, management has asked to develop disater recovery solution without adding any extra cost(ie no tools to be bought). I am doing some research with RMAN to do this. I have programs to move the archived logs from production to disaster site.
I have my disaster database in sink with my production till yesterday's full backup. Now today evening i just want to apply the todays archivedlogs backed up from production site. Is it possible to do this and how? Remember i will not restore the entire backup and then do the recovery. One more point i also have control file backup for today.
Your responses are appreciated.
Thanks in advance
Amit

hi,
i believe it is not possible to recover your db by applying the archivelog to disaster site.when you restore your db from the previous backups then it becomes a seperate db,now consider the situtaion on your production db ...
users are making changes to prod server and this causes lots of arhivelogs to be generated on prod server,now the ctlfile of prod db knows the name and location of archivelogs,And if you perform rcovery on prod site then it is ok,but if you want to recover your disaster db by using these logs then the disaster site ctlfile dosen't know about the location and name of the archivelogs which was generated on prod site.because both db's ctl file is out syncronisation.
now if you only concerned bout the changes to be made on disaster site then you have an option of creating matrilized views on disaster site and keep syncronise it with prod db.
in your scenario you need to create a standy db to accomplish your tasks,but as you have standerd edition then it is also not possible to create a standby db.but i believe there must be some alternate ways to achieve this in your existing standerd edition just use google to make it true.
hare krishna
alok

Is anyone doing disaster recovery for a J2EE application?

We generally use database log shipping to maintain a standby database for our ABAP instances. We can successfully fail over our production application to our disaster recovery site with no real issues. With the J2EE instances (EP, ESS/MSS, BI, etc), we have a few concerns:
hostname cannot change, without going through a system copy procedure, so we would have to keep the hostnames in DR the same. (for example, ref: oss note 757692 - changing hostname is not supported)
fully qualified domain name - from what I understand, there are potentially issues with changing the fqdn, for example SSO certificates, BSPs, XI has issues, etc.
we can't keep both hostname and fqdn the same between DR and production, or we could never do a DR test.
Has anyone implemented disaster recovery for any SAP J2EE application that has run into these concerns and addressed them? Input would be greatly appreciated regarding how you addressed these issues, or how you architected your disaster recovery implementation.
Regards,
David Hull
The Walt Disney Company

I haven't done this personally, but I do have some experience with these issues in different HA environments.
To your first point: You can change the hostname, note 757692 tells you exactly how to do it. However like the note says, "Changing the name of a host server in a production system is not automatically supported by SAP." When it says "supported by SAP" I think it means SAP the company, not SAP's software. So I would contact SAP to see if this configuration would be covered under your service agreement. Then you have to think about whether you want to do something that isn't "officially supported" by SAP. Also I'm sure you'll need some kind of additional licensing for the DR systems as their hardware keys will de different.
To your second point: As for SSO certs (SAP Login Tickets), I think they should still work as long as the SID and client number of the issuing system remain the same. I don't think they are hostname or fqdn dependant. For BSPs I would think they would still work as long as they use relative paths rather than absolute paths. And for XI... I have no idea what kind of issues may arise, I'm not an XI guy.
Again, I haven't done what you're describing myself. This is just based on my HA experiences.
Hope this helps a little,
Glenn

Disaster Recovery Plan for SAP BW

Dear All,
We are planning for robust Disaster Recovery Site for BW . We have similar R3 & BIW servers at DR site at different location and data is being copied every 3 Hrs.
R3 & BIW at DR site is exact replica of primary site. When primary site is down DR site will act as a primary. In that case we might face data loading issue from DR R3 to DR BW because of source system change. If we change the source system then we loose data consistency and might need initialisation. We are looking for the solution which will involve less efforts to up the system.
Does anyone has done this or overcome this situation ?
Regards,
Manish

Hi Raman,
We are doing disaster recovery test for both ECC and BW systems so whole PR system switched to DR system for some time and then back to PR system. so in that case what precautions we need to take from BW side?
Thanks
Bhavin

Disaster Recovery: Active/Passive Mail Flow

Hello. I am planning to deploy an active/passive server environment for Exchange 2013. Here's what I plan to achieve:
EXCHANGE-A - on production site, active (all mail flow goes through here), member of DAG
EXCHANGE-B - on disaster recovery site, passive (mail flow goes through here ONLY when activated), member of DAG
I have tried disabling all receive connectors on EXCHANGE-B, however that causes OWA to delay sending messages for around 20 seconds (messages stuck in Drafts folder before being sent out). I have also tried disabling Exchange Transport services on EXCHANGE-B
but to no avail.
Is it possible to achieve active/passive mail flow server environment? What is the best way to achieve this? I appreciate any leads on this matter.

Hi ,
Shadow redundancy configuration is available on the transport config and any change applied on the transport config parameters will get applied to all the transport servers in our organisation and it not specific to the server level.
Command
to disable the shadow redundancy feature :-
set-TransportConfig -shadowredundancyenabled $false
Note : Above command will disable the shadow redundancy feature for your entire organisation.
Thanks & Regards S.Nithyanandham

Composition Disaster Recovery - Mirroring

Hi Experts,
I am planning to setup Disaster Recovery site for the current Production.
The Environment is:
SAP NetWeaver 7.2 SR 1
DB2 9.1 on AIX 6.1
I am quite doubt on the strategy of mirroring the java. We have few CAFs and BPM running in current production.
Kindly provide your valuable inputs.
Regards,
Nikhil Bose

As per the documentation, we are following a full off-line back up weekly and a delta daily. Of course, this serves us the DR site. We doubt whether this is enough to bring back the CAF process states.
There is a custom table in R/3 storing CAF process-state specific information. For this reason, we are thinking of doing the full off-line backup daily.
Kindly let me know any thought/concerns on this approach.
Regards,
Nikhil.

Welcome to the SQL Server Disaster Recovery and Availability Forum

(Edited 8/14/2009 to correct links - Paul)
Hello everyone and welcome to the SQL Server Disaster Recovery and Availability forum. The goal of this Forum is to offer a gathering place for SQL Server users to discuss:
Using backup and restore
Using DBCC, including interpreting output from CHECKDB and related commands
Diagnosing and recovering from hardware issues
Planning/executing a disaster recovery and/or high-availability strategy, including choosing technologies to use
The forum will have Microsoft experts in all these areas and so we should be able to answer any question. Hopefully everyone on the forum will contribute not only questions, but opinions and answers as well. I’m looking forward to seeing this becoming a vibrant forum.
This post has information to help you understand what questions to post here, and where to post questions about other technologies as well as some tips to help you find answers to your questions more quickly and how to ask a good question. See you in the group!
Paul Randal
Lead Program Manager, SQL Storage Engine and SQL Express
Be a good citizen of the Forum
When an answer resolves your problem, please mark the thread as Answered. This makes it easier for others to find the solution to this problem when they search for it later. If you find a post particularly helpful, click the link indicating that it was helpful
What to post in this forum
It seems obvious, but this forum is for discussion and questions around disaster recovery and availability using SQL Server. When you want to discuss something that is specific to those areas, this is the place to be. There are several other forums related to specific technologies you may be interested in, so if your question falls into one of these areas where there is a better batch of experts to answer your question, we’ll just move your post to that Forum so those experts can answer. Any alerts you set up will move with the post, so you’ll still get notification. Here are a few of the other forums that you might find interesting:
SQL Server Setup & Upgrade – This is where to ask all your setup and upgrade related questions. (http://social.msdn.microsoft.com/Forums/en-US/sqlsetupandupgrade/threads)
Database Mirroring – This is the best place to ask Database Mirroring how-to questions. (http://social.msdn.microsoft.com/Forums/en-US/sqldatabasemirroring/threads)
SQL Server Replication – If you’ve already decided to use Replication, check out this forum. (http://social.msdn.microsoft.com/Forums/en-US/sqlreplication/threads)
SQL Server Database Engine – Great forum for general information about engine issues such as performance, FTS, etc. (http://social.msdn.microsoft.com/Forums/en-US/sqldatabaseengine/threads)
How to find your answer faster
There is a wealth of information already available to help you answer your questions. Finding an answer via a few quick searches is much quicker than posting a question and waiting for an answer. Here are some great places to start your research:
SQL Server 2005 Books Onlinne
Search it online at http://msdn2.microsoft.com
Download the full version of the BOL from here
Microsoft Support Knowledge Base:
Search it online at http://support.microsoft.com
Search the SQL Storage Engine PM Team Blog:
The blog is located at https://blogs.msdn.com/sqlserverstorageengine/default.aspx
Search other SQL Forums and Web Sites:
MSN Search: http://www.bing.com/
Or use your favorite search engine
How to ask a good question
Make sure to give all the pertinent information that people will need to answer your question. Questions like “I got an IO error, any ideas?” or “What’s the best technology for me to use?” will likely go unanswered, or at best just result in a request for more information. Here are some ideas of what to include:
For the “I got an IO error, any ideas?” scenario:
The exact error message. (The SQL Errorlog and Windows Event Logs can be a rich source of information. See the section on error logs below.)
What were you doing when you got the error message?
When did this start happening?
Any troubleshooting you’ve already done. (e.g. “I’ve already checked all the firmware and it’s up-to-date” or "I've run SQLIOStress and everything looks OK" or "I ran DBCC CHECKDB and the output is <blah>")
Any unusual occurrences before the error occurred (e.g. someone tripped the power switch, a disk in a RAID5 array died)
If relevant, the output from ‘DBCC CHECKDB (yourdbname) WITH ALL_ERRORMSGS, NO_INFOMSGS’
The SQL Server version and service pack level
For the “What’s the best technology for me to use?” scenario:
What exactly are you trying to do? Enable local hardware redundancy? Geo-clustering? Instance-level failover? Minimize downtime during recovery from IO errors with a single-system?
What are the SLAs (Service Level Agreements) you must meet? (e.g. an uptime percentage requirement, a minimum data-loss in the event of a disaster requirement, a maximum downtime in the event of a disaster requirement)
What hardware restrictions do you have? (e.g. “I’m limited to a single system” or “I have several worldwide mirror sites but the size of the pipe between them is limited to X Mbps”)
What kind of workload does you application have? (or is it a mixture of applications consolidated on a single server, each with different SLAs) How much transaction log volume is generated?
What kind of regular maintenance does your workload demand that you perform (e.g. “the update pattern of my main table is such that fragmentation increases in the clustered index, slowing down the most common queries so there’s a need to perform some fragmentation removal regularly”)
Finding the Logs
You will often find more information about an error by looking in the Error and Event logs. There are two sets of logs that are interesting:
SQL Error Log: default location: C:\Program Files\Microsoft SQL Server\MSSQL.#\MSSQL\LOG (Note: The # changes depending on the ID number for the installed Instance. This is 1 for the first installation of SQL Server, but if you have mulitple instances, you will need to determine the ID number you’re working with. See the BOL for more information about Instance ID numbers.)
Windows Event Log: Go to the Event Viewer in the Administrative Tools section of the Start Menu. The System event log will show details of IO subsystem problems. The Application event log will show details of SQL Server problems.

hi,I have a question on sql database high availability. I have tried using database mirroring, where I am using sql standard edition, in this database mirroring of synchronous mode is the only option available, and it is giving problem, like sql time out errors on my applicatons since i had put in the database mirroring, as asynchronous is only available on enterprise version, is there any suggestions on this. thanks ---vijay

Disaster Recovery site failover

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