Active passive RAC configuration

hi,
how can I change the active-active RAC database to active-passive RAC database?
1) Is it enough to change active_instance_count=1?
2) Is there any change required in client side tnsnames.ora file?
I want to install two databases, db1 is active in node1 and passive in node2.
And db2 is active in node2 and passive in node1.
3) For configuration of this, which method is best?
current client side tnsnames.ora file as follows:
DBRAC =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = gcappdev-vip)(PORT = 1523))
(ADDRESS = (PROTOCOL = TCP)(HOST = gcwebdev-vip)(PORT = 1523))
(LOAD_BALANCE = yes)
(FAILOVER=ON)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = DBRAC)
(FAILOVER_MODE = (TYPE=SELECT)(METHOD=BASIC))
)

When you mean passive.. do you want the database to be down or not usable?
If you are on 10g.. then the best method to do this is to use Services. Have services enabled on both instances. however it will be preferred on one instance /node and available on the other.
With this, when instance one where to crash, the service will failover to instance 2 and will be immediately available.

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The benefit is that you can save on licensing costs while gaining availability
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Hi user1701261,
One option to divert traffic to specific node could be setting 11g Services in active , passive mode.
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Hello folks,
if we are creating 2 node RAC in Oracle 11g... Sequence coordination will happen between the nodes when the next sequence number is requested; The question is if I create the 2 node RAC in Active/Passive mode(I m thinking to do this either using ACTIVE_INSTANCE_COUNT parameter as I have only 2 nodes or to use srvctl to set preferred and available instances), will the sequence co-ordination will still happen if I request a sequence number?
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Edited by: ~RK on Mar 12, 2012 11:39 PM

Hi user1701261,
One option to divert traffic to specific node could be setting 11g Services in active , passive mode.
srvctl add service -d DB01 -s DB01_SRV -r "db011" -a "db012, db013"
Where
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-a "<available_list>" Comma separated list of available instances
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Hi,
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What was the reason you went for active/passive RAC setup ?
--> this is requirement.
I thought cluster could achieve the same thing.
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3) Any URLs on this topic
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Niall
user526463 wrote:
My company was recently purchased. The new company has a "policy" about any High Availability database be an Active\Active configuration. We have in the past used active\passive RAC installs with each site have multiple active RAC nodes. I am interested in see what the cases are for a true Active\Active environment where there will be multiple RAC nodes in each "cluster" and multiple databases (disk) which are actively written to, then synchronized. (As apposed to a couple mutinode RAC setups with a primary\standby database)
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Active\Active vs Active\Passive

My company was recently purchased. The new company has a "policy" about any High Availability database be an Active\Active configuration. We have in the past used active\passive RAC installs with each site have multiple active RAC nodes. I am interested in see what the cases are for a true Active\Active environment where there will be multiple RAC nodes in each "cluster" and multiple databases (disk) which are actively written to, then synchronized. (As apposed to a couple mutinode RAC setups with a primary\standby database)
Any white papers or best practice document references would be great. I'd hate to do this just case of some policy.
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Niall
user526463 wrote:
My company was recently purchased. The new company has a "policy" about any High Availability database be an Active\Active configuration. We have in the past used active\passive RAC installs with each site have multiple active RAC nodes. I am interested in see what the cases are for a true Active\Active environment where there will be multiple RAC nodes in each "cluster" and multiple databases (disk) which are actively written to, then synchronized. (As apposed to a couple mutinode RAC setups with a primary\standby database)
Any white papers or best practice document references would be great. I'd hate to do this just case of some policy.
Thanks

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Best,

hello
I was going through your post and i am also doing the same thing here at our organisation for Oracle 10g R2
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Asandeen

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Fanny Liu
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Configuring Active-Passive cluster for Oracle Database on Red hat

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Thanks

This scenario is usually done through custom scripts.
To get an idea of what is required, I recommend you look through Oracle's DataGuard documentation, as Data Guard is a free utility included in the Enterprise Edition to do exactly what you want.
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Hey, I have to manage an active passive cluster on SLES10 SP4. Oracle 10.2.0.4
All oracle binaries are on a DRBD Device on mountpoint /oradata.
This mountpoint includes the binaries and all datafiles.
I havent installed these systems. At one stage on node died and got reinstalled by a systemadministrator.
After a switch from the running node to the standby node, the cluster is not starting.
Jan 3 14:36:01 a logger: Cluster Ready Services waiting on dependencies. Diagnostics in /tmp/crsctl.6114.
Jan 3 14:36:14 a logger: Waiting for Oracle CSS service to be available before starting
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In asmcmd the diskgroups are showing DISMOUNTED (show MOUNTED before)
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b) What could be a reason for not being able to write to the database ?
c) How would you guys install an active/passive cluster ?
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Hi,
first of all please clarify, if you have Oracle clusterware installed, or just the local configuration for local ASM.
There is a big difference between the 2, and also using DRBD has nothing to do with Oracle clusterware (and is not supported by Oracle).
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Regards
Sebastian

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You might have better luck asking this question in the (somewhat misnamed) [Data Integration and Data Quality Management|Data Services and Data Quality; forum:
This forum is dedicated to topics related to SAP BusinessObjects Data Services (Data Integrator, Data Quality Management, Text Data Processing), SAP BusinessObjects Information Steward (Metadata Management, Data Insight), SAP BusinessObjects Rapid Marts and SAP BusinessObjects Data Federator.
(emphasis added)
Regards,
Sean
P.S. to moderators: can you create a sticky post to this effect?

Active passive RAC configuration

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