SQL 2012 :: Availability Groups And Failover Cluster Instances

Mar 21, 2014

I'm reading up on Always on and I am confused what is the difference between AlwaysOn Availability Groups and AlwaysOn Failover Cluster Instances.

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SQL 2012 :: Failover Clustered Instance With Availability Groups

Oct 22, 2014

Approach 1:

Prod - shared storage between server 1 and 2
Server1: clustered SQL instance with availability group as primary
Server2: Passive server for clustered instance of PROD

DR - shared storage between server 1 and 2
Server1: Clustered SQL instance with availability group as replica
Server2: Passive server for clustered instance of DR

Approach 2: Using replicated SAN
Prod -
Server 1: Standalone instance with availability group as Primary
Server 2:Standalone instance with availability group as replica

DR -
Server 1: Offline until Disk group 1 (Prod server 1) has been broken and brought online at DR
Server 2: Offline until Disk group 2 (Prod server 2) has been broken and brought online at DR

Both these approaches will work wont they? I have only built and played with normal availability groups across servers, not mixing it with clustered instance replicated SAN

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Failover, Cluster, High Availability

May 18, 2004

Does any one know, any software out there that can provide a solid failover / cluster / high availability solution for SQL Server 2000 Databases.
I have tried Incepto but it requires an extra column in every single table that involves in Replication and its not gonna work

So Please advise.


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Cluster Shared Volumes And Availability Groups

Aug 12, 2015

I'm looking at using Cluster Shared Volumes on a new Windows Server 2012/SQL Server 2014 cluster. Each instance is going to be configured to use cluster shared volumes. Is there any reason why Availability Groups couldn't be used in conjunction with Cluster Shared Volumes.

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SQL Server 2008 :: Change IP Address Of Failover Cluster Instances

Mar 9, 2011

IF you need to change the IP Address of a SQL Server Failover Cluster instance, here is the steps:

1. Open up Failover Cluster manager.
2. Expand the MS Cluster Instance that your SQL Cluster instance resides on.
3. Expand Services and applications.
4. Select the SQL Server Service.
5. In the main window pane (Middle Screen), you should see your SQL Server Cluster name, expand the plus to the left of it.
6. Under your SQL Server Cluster name, you should now see an 'IP address' section, right click on it and go to properties.
7. In the properties pane, you can change your IP address by entering a static IP.....or assigning a DHCP enabled IP.

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SQL 2012 :: Database Can't Be In Two Availability Groups

Jun 30, 2014

I been trying to learn availability groups since I have not implemented it.

From my understanding you can have more than one group.

Lets pretend we have two groups in one instance:

1. Accounting
2. Engineering

From my understanding you can't make a database in two AG because it wouldn't make sense.

But lets pretending there is one database that both are used by accounting and engineering.

Would you have to make a third AG for future fail overs so that other databases in the other two group don't failover when not needed because when you fail over an AG all the databases inside it fail over.

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SQL 2012 :: Server Cluster Without Windows Failover Cluster

Feb 18, 2014

I´ve been reading that SQL Server 2012 Always On is dependent on having a Windows Failover Cluster setup. Is that correct ?

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SQL 2012 :: Multiple Availability Groups On One Instance

Aug 12, 2013

From what I understand, one SQL Server 2012 instance can host multiple availability groups. That should allow, for example, the following situation - one SQL Server 2012 instance containing three primary replica databases - each one part of a different availability group - and each availability group's secondary replica located on a separate SQL Server 2012 instance.

Can you have three SQL Server 2012 instances, each with one primary replica database and have all three secondary replica databases on one SQL Server 2012 instance? So instead of, as above, going from 1 primary server to 3 secondary servers, this time we're going from 3 primary servers to 1 secondary server? The one secondary server would then contain all three secondary replicas for each of the 3 separate primary replicas.

This would mean that the single server (where all three secondary replicas reside) was part of three separate Windows Server Failover Clustering clusters.

Is this scenario possible?

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SQL 2012 :: AlwaysON Availability Groups And Listeners

Feb 13, 2014

I have four instances and each instance have its own Availability Group with its own listener.

Would like to know if you can have one listener for multiple Availability groups?

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SQL 2012 :: Renaming AlwaysOn Availability Groups?

Apr 28, 2014

We had 3 Availability Groups set up in SQL 2012 last year but they were poorly named so I am just looking to rename them but there doesn't seem to be any command for it that I can find.Can they not be renamed once created? I guess I could just create new ones and move the DB's into them but just thought I would check!

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SQL 2012 :: Bulk Loading In Availability Groups

Aug 14, 2014

I have several 2012 availability groups running on a cluster. I have one database that is bulk loaded every 30 minutes. The DB is about 1 GB in size. To be on the availability group it has to be set to full recovery mode, but simple or even bulk would obviously be better. Is there a better way to handle the transaction log size other than to run a backup after each bulk load causing extra overhead? With mirrors you could use simple, but since those are going away . . .

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SQL 2012 :: Availability Groups - Missing Objects

Aug 15, 2014

I would like synchronizing all the missing objects (logins, agent jobs, SSIS, and anything else that I've missed) across SQL 2012 Availability Groups.

I would like to be able to able to automate this process....

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SQL 2012 :: Availability Groups And Bulk Loads

Sep 8, 2015

We have some tables that are bulk-loaded every day and they do not have RI to the other tables in the database.

To ease pressure on the logs, I had the idea of spinning them off to another database on the same AG in simple or bulk-load recovery model and using synonyms to point to them so the code base would not need changing.

I know an earlier bug in 2005 existed that basically made the query analyzer ignore indexes if a table was accessed via a synonym.

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SQL 2012 :: Re-index With AlwaysOn Availability Groups

Sep 15, 2015

We have multiple SQL 2012 SQL servers setup in an alwaysOn availability groups. Where should we schedule the re-index? We have Server1 as the primary and 2 secondaries Server2 and Server3. Are their any tricks to have it run on which ever one is the primary?

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SQL 2012 :: Backup / Restore Availability Group Following Failover

Jul 21, 2014

I have 2 servers in a SQL Server Fail-Over Cluster. IOW I use always-on availability groups. I run backups - full, diff and log - regularly via SQL Agent on one server only depending on which is primary. If there is a fail-over, then backups will continue on the other server. If I have to restore a database in an availability group I probably would need some combination of full, diff, and log backups from each server. Would that actually work? I test the backups weekly however I just realized that I never tested that scenario.

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SQL 2012 :: Availability Group Is Not Ready For Automatic Failover

Dec 19, 2014

how to resolve and trouble shoot the availability group is not ready for automatic failover in sql2012

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SQL 2012 :: Automated Script Run On Availability Group Failover?

May 29, 2015

Let's say I have a two node AG, Server A and Server B. Server A is normally the primary and Server B is the replica. Whenever the primary fails over from A to B or from B to A, I'd like to automatically run a script that will restart the SQL Agent service on the new replica.

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SQL 2012 :: High Availability Groups Service Restart

Jun 9, 2015

I inherited a SQL 2012 Ent server sitting on a 2008R2 server using AlwaysOn High Availability, two nodes.

Available Mode: Synchronous commit
Failover Mode: Manual
Connection in Primary role: Allow all connections
Readable secondary: No
seesion timeout: 10

Somebody decided to give SQL server priority boost so I need to change this ASAP. So I plan on doing the following.

1. Manually fail over to the secondary, which does not have the priority boost set to true
2. change the setting
3. restart the service
4. Manually fail over

My question is with the service restart. How does SQL handle if the DB changes on the new primary while the secondary is having the service restarted. Where can I see if the DB are sync again or if not where are they in the sync process.

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SQL 2012 :: Availability Group Failover Stops Working After First Failure

Apr 21, 2014

I've setup a two node Cluster Server (non-shared storage) with a file sharing witness. I'm testing some of the different failover scenarios to see that everything is working properly. Everything works fine until I try testing the failure of the SQL Server service. When I stop the SQL Service on the primary server, it fails over to the secondary server as expected. I then start the service on the (now) secondary server and it comes back online as the secondary server. I then try to test that the service will fail back over when I stop the service on the new primary server.

However, when I stop the service, the secondary server now shows "resolving" and never comes back online. When I bring the service back up on the primary server, the secondary now shows as secondary instead of resolving. So to see if it's something about failing over from one server to another, I do a manual failover making the original primary server the primary again and everything is as it was originally.

I then stop the service on the primary server, but the secondary server now says resolving and the AG will not become available again until I start the service on the primary server.

It seems that when I first configured the quorum it worked fine the first failover scenario, then stopped working. I then added the file sharing witness, and failover worked the first time again, but not after that. For some reason after the initial failover it won't automatically failover again after that.


Servers: Windows Server 2012 Standard
SQL : SQL Server 2012 Enterprise SP1

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Recovery :: Server Local High Availability Using Failover Cluster And Disaster Recovery Using AlwaysOn

Aug 17, 2015

We have a requirement to build SQL environment which will give us local high availability and disaster recovery to second site. We have two sites- Site A & Site B. We are planning to have two nodes at Site A and 2 nodes at Site B. All four nodes will be part of same Windows failover cluster. We will build two SQL Cluster, InstanceA will be clustered between the nodes at Site A Server and InstanceB will be clustered between the nodes at Site B, we will enable Always On Between the InstanceA and InstanceB and will be primary owner where data will be written on InstanceA and will be replicated to InstaceB. URL....Now we want we will have instanceC on the Site B and data will be writen from the application available on Site B, will be replicated to the instance on the Site A as replica.

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SQL 2012 :: Failover Cluster Using Virtual Box

Mar 29, 2014

I have virtualbox installed on my notebook. For testing purpose, is it possible to setup SQL Server Fail-Over cluster using virtual box? I don't have a shared storage. How can I simulate that?

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SQL 2012 :: How To Create Failover Cluster Using VMs

May 5, 2014

How to create a SQL 2012 Failover cluster using VMs?

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SQL 2012 :: Going From Cluster To Avail Groups

May 13, 2015

So, today we have the following:

Dallas: A 2 node Windows 2008 Cluster running SQL 2012 ENT cluster
Wash: A 2 node Windows 2008 Cluster running SQL 2012 ENT cluster

and I'm mirroring (synchronous, no witness) a database from Dallas to Wash.Crappy set up. I know.Now customer wants to have the database mirror to another server in Dallas.What are the high level steps to transform my two clusters to use Availability Groups and Always On?Do I need to basically start over and build a new environment?or can I transform my two disconnected cluster?

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SQL 2012 :: Create Failover Cluster Without Log Shipping

Jan 21, 2015

I am trying to create a failover cluster without the log shipping in 2012 as i've done it with a static instance with some database.Is the "AlwaysON" feature the solution when an application creates random and numerous databases within the instance and we need a failover scenario ?

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SQL 2012 :: Renamed Failover Nodes For Cluster And Broke It

Apr 17, 2014

I had a cluster running on 3 nodes (windows failover cluster) with server 2012 and SQL server 2012 running in the cluster. Well, I thought I'd just go ahead and rename all 3 of the hosts with new hostnames and it apparently broke the cluster pretty bad. Now when I open failover cluster manager I cannot see anything nor can I connect to the cluster object in AD. I re-named all of the hosts back to their original names but that didn't work.

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SQL 2012 :: Multi-Site AlwaysOn Failover Cluster

Oct 6, 2014

We are implementing a multi-site (Windows Server Failover Cluster) WSFC to enable Always On between our primary and DR site. We are not going to use SQL clustered instances. We are not planning to use shared disks. Each node is running a standalone instance of SQL 2012.

I have successfully configured a 3 node multi-site Windows failover cluster with no shared storage. For quorum, I have defined a File Share Witness (FSW). The FSW has voting rights and is in the DR site. The setup looks like this –


•Node A – Site #1 (voting right = 1)
•Node B – Site #1 (voting right = 1)
•Node C – Site #2 (voting right = 0)
•FSW – Site #2 (voting right = 1)

Again - There are no shared disks in our setup. We are not going to use SQL clustered instance. We are going to use Always On with these 3 nodes.

SQL Always On –

•Node A – Site #1 (Primary Replica)
•Node B – Site #1 (Readable Secondary)
•Node C – Site #2 (Readable Secondary)

All the setup including the “availability group” works properly under this setup. However, a failover to site #2 under DR situation is not working and I know why but don’t know what needs to be done to fix the problem.

The following works fine –

•Automatic failover between nodes A and B (same site – site #1)
•Forced failover to node C in site #2 provided at least one of the nodes in site #1 is up (non – DR situation) - this will ensure the cluster is up

The following is not working –

•Forced failover to node C in site #3 when both nodes in site #1 are lost (true DR situation) – This is because the cluster is not up at this point.

I know I have to bring the cluster up somehow and I have not been able to do so by restarting the cluster service.

I tried to run the command to start cluster service.

Question –

How can I FORCE the cluster to come up in Site #2 on node C when it has no voting rights?

I have always worked with even number of nodes and shared disks with traditional clustering. I am not sure what needs to be done in this scenario with 3 nodes and a FSW.

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SQL 2012 :: AG - How To Find Cluster Failover Count In AlwaysOn

Sep 30, 2015

How can we find the cluster failover count in always on ?

As my AG is configured as synchronous mode , AG went offline and we manually restarted the AG service when we check the properties on AG role they r in default setting ?

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DB Engine :: Server 2012 Failover Cluster New Instance

Aug 6, 2015

I am new to SQL Server 2012 clustering.I added a new instance to one of the two nodes.when I try to move it to the other node it fails.Do I need to install it on both?If so, what options do you install on the second node?

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SQL 2012 :: How To Install Cluster On Multiple Instances

Mar 4, 2015

We have 5 instances on our clients old machine with SQL 2005, now they want us to move on cluster environment with SQL 2012.

Once I have installed and configured SQL cluster with single instance, but how to install SQL Cluster environment for Multiple instances.

Should I install all the instances first and than have to configure cluster ?
Is there any way that first I will install cluster and than we can add the instances ?

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SQL 2012 :: Cluster With Multiple Instances On The Same Node?

Jul 14, 2015

What I have- Sql server 2012 (Standard Ed) Cluster on Windows 2012 R2 with both instances running on the same node- just to save on License, i.e. technically it’s Act/Pas cluster.

What I am looking for- how to configure cluster (e.g. via quorum, etc) to force both instances failed together? Means if for some reason 1-st instance will fail to node 2 another instance should follow (otherwise it will be Act/Act cluster and 2-nd license is required).

If there is no standard way (cluster configuration I mean) to do it I should create some custom process to monitor where each instance is running.

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SQL Server 2012 :: Remove Named Instance From Failover Cluster

Oct 13, 2014

In QA we have a two-node cluster with four instances of sql. In trying to add a fifth, I was given an IP address already in use so the install hung.

I removed it from the cluster but it is still there in the registry etc on the node I was working on.

I read about using the maintenance tab of the sql server install to "remove a node" but the terminology is confusing. To me a node is a physical server and an instance is an instance of sql server -- not the same at all but they are often referred to as the same thing.

I definitely don't want to remove one of the servers from the cluster.

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SQL 2012 :: Node Cluster Active / Passive With 10 Instances

Jun 5, 2015

It is an active passive cluster which doesn’t allow any testing. All instances have to be failed over together, we aren’t allowed to just failover 1 even for testing purposes. Node 1 is the active node and we can failover to node 2 for 30 days free of charge but services have to then be failed back.

We need to run the cluster with node 1 as the primary node always and 2 just use for failover testing or for less than 30 day periods whilst performing cluster patch upgrades etc.

Now l am sure we could fail over 1 instances at a time for testing and diagnosing issues plus if add a new instance that's not production to get to the platform level as the rest of the instances this would avoid taking production down in the fail over process.

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SQL 2012 :: Failover Cluster Install Hangs On Remote Machine Discovery

Feb 18, 2015

I am trying to install SQL Server 2012 onto an already configured and validated windows failover cluster (server 2012) but the process is hanging after installing the setup files.

The last entry in the log is:

running discovery on remote machine

and I've left it hanging like this for 4 hours and nothing happens.

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