Failover is the concept of moving services from one host or node to another in order to provide high availability in a computing system.

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SQL Server 2012 Cluster Service pack 3 fail to failover node

Roughly a year ago, i had this problem with an 2008R2 cluster. I asked about it here, but i didn't grab enough logs in the process. And now i have the same problem on my 2012 failover cluster. So i'm ...
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SQL Server 2012 on a Windows 2008 R2 cluster, would like to upgrade Windows to 2012 R2

I need someone to help validate a strategy. I have a pair of Windows 2008 R2 server in a active/passive failover cluster with SQL Server 2012 installed. I would like to upgrade the Windows OS to ...
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756 views

pgpool-II doesn't execute my failover script

I have been installed pgpool-II 3.3.4 from source. I have two pgpool nodes and I also used the watchdog configuration to get a pgpool services with High Availability. When I stop one, the other wake ...
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43 views

Understanding of SQL Server active/active cluster

I have a vague understanding of SQL Server's active/active cluster. Can anyone help to confirm if my understanding is correct? As I understand, active/active cluster use two or more Windows servers. ...
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1answer
82 views

Linked server to Availability Group Listener - is anyone successfully using one?

I edited the question hoping to check the basic stuff first. Does anyone have linked servers that successfully work with Availability Group listener? Have anyone heard of problems with linked servers?...
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17 views

Scenario to automate the promotion of a read replica when the master db is not responding

I would like to set a scenario like the following: Set an RDS event subscription [that the MySQL is unresponsive] that will publish to an SNS topic that will trigger a Lambda function which will ...
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224 views

Replication throw an error after failover mirror partner is down in SQL Server

Received an error mentioned below after failover when mirror partner is down. Error : to fail over to a database which is not configured for database mirroring. code: 22037, text: 'Invalid ...
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822 views

MySQL failover - Master to Master Replication

My company is trying to implement a MySQL failover mechanism, to achieve higher availability in our webservices tier - we commercialize a SaaS solution. To that end we have some low-end VMs scattered ...
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49 views

Slave DB promoted as Master DB when Master DB is down. New data added on the new master while old master is down

I am currently setting up a call center system (Vicidial) having a Master DB and a Slave DB. When the Master would go down, I have made a script on the SlaveDB that would execute "stop slave" on the ...
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48 views

patching SQL Server with Availability Group and Secondary Replica

Scenario: SQL Server 2014 CU6. 1 AG with 2 databases (compatibility level 100). Failover Cluster with 3 nodes on Windows Server 2012 R2. Primary Availability Replica on node 1 and node 2. Secondary ...
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53 views

SQL 2012 Availability Group issue - The core cluster resources do not move when we initiate AG fail-over

I have a Windows 2012R2 cluster with two nodes and a File Share quorum. I am running SQL 2012 SP2 and I have configured a test AG with a dummy database. When I fail-over the AG, the Availability ...
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26 views

Firewall Rules, ip address failover cluster

We are having issues with some applications running and connecting to a failover cluster through a firewall(no windows firewall). In the firewall settings we configure the ip addresses from the ...
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52 views

Why switch? [ReplicationExecutor] another primary seen with election time xxx:1 my election time is yyy:1

On 09-05-16 - 08:41:51 Replica Set elected a new primary. The question why? Here the logs from this time series and without login messages egrep -v 'NETWORK|ACCESS'. On the same OpenStack platform ...
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1answer
260 views

Adding a distributor for availability groups

According to this MSDN article, I need to add a distributor: Configure Replication for AlwaysOn Availability Groups (SQL Server) I'm confused by this particular statement: The distributor should ...
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1answer
23 views

Should a Sql Server be accessible through the service's virtual network name?

In a working SQL-Server failover cluster environment I can open a SQL-Server connection using the configured service's IP address independantly of the current node it is on. I wonder if the assigned ...
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1answer
47 views

Sql Server Cluster with multiple nodes

Does it make sense to think about a failover cluster configuration where less than 50% of all included nodes are standby? For example instead of setting up 4 clusters with two nodes each where one is ...
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1k views

If I fail over one database, do the others that share the same mirror endpoint fail over as well?

We have two databases setup for mirroring on a single SQL Server instance: a test database and a production database. Both get mirrored to another server using the exact same endpoints. If I go into ...
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269 views

Manual Failover with AlwaysOn availability group

We are planning to upgrade our SQL 2012 to SQL 2014. We currently use a mirror for our production databases but are planning to move to availability groups. We are going to be running 2 SQL Servers on ...
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64 views

SQL 2014 Availability Group Cluster or Listener

We recently deployed a setup of SQL 2014 availability groups and we are having some difficulty with the failover. Setup: Two windows server 2012R2 VMs in a windows cluster with a CNAME pointed at ...
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1answer
56 views

Windows cluster failed over, but SQL instances didn't move

I recently inherited a SQL Cluster (2008R2) which for the most part behaves itself impeccably. The windows cluster is made up of two nodes running Active/Passive, Node1 and Node2 are dedicated ...
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3answers
1k views

Avoiding MySQL Fabric to become a single point of failure

I managed to install and configure MySQL Fabric that manages multiple MySQL Server nodes. It works very well since I tested it by connecting to the Master node directly and played with the data (...
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3answers
2k views

Is MSDTC required for SQL Server 2012 Fail Over Cluster?

I am making a 2 node SQL Server 2012 Failover Cluster; do I need to install the MSDTC component? If yes, can both be installed on single shared disk?
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61 views

Install SP4 on SQL Server 2008 SP3 - named clustered instance MQ and PQ in A/A configuration on two Nodes A and B

Current config - We have two named instances called MQ and PQ which are clustered in A/A configuration on two nodes A (for PQ) and B (for MQ). MQ and PQ instances/features on both nodes A and B are ...
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30 views

Manually specifying candidate masters in Maxscale

Looking over the documentation, I haven't quite been able to find if its possible to manually set the candidate master status of a server in Maxscale. The reason I am looking for this is because some ...
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51 views

MaxScale not correctly recognizing new topology when we failover to a new master

So I currently have an architecture where we have one master and one slave and read/write splitting in Maxscale. When we fail the slave, Maxscale correctly recognizes it and displays the information ...
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2k views

MS SQL Server 2012 Failover Cluster connection issue

I was about to give up with this but I'll give it a go here if anyone can help. I've set up a fail-over cluster SQL Server with 2 SQL nodes, Domain controller and file witness. All seems to work fine,...
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99 views

Remove a node from Failover Cluster

We had 5 SQL Server 2012 servers configured with AlwaysOn. A few days ago we dismissed 2 of them, we removed them from the availability group and then stopped SQL services. We need to reuse these ...
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1answer
171 views

Can I get pg_rewind to show me lost data after a Postgres failover?

Say I have Postgres setup with a warm standby using the build in replication features. Now, imagine a scenario where the data centre the master loses power and the slave is in another data centre and ...
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21k views

Clustering vs. transactional replication vs. availability groups

Assuming you need to make sure your application that relies on SQL Server 2012 as its database backend is available around the clock, even if one server machine fails. As a developer and not a DBA, I ...
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78 views

Can SQL Server 2012 FCI have multiple names?

Is it possible to have multiple names for the same SQL Server Failover Cluster Instance (virtual server)? IT has a naming convention they like, but it hard codes the Windows cluster name into the SQL ...
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50 views

Mixing Clustered Instance and Non-Clustered Instance

I'm currently managing a 2 node SQL Server Failover Cluster in Active/Passive setup. I plan on adding a new SQL Server instance which doesn't have to be on the Failover Cluster. The only documentation ...
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122 views

Force a Member to Become Primary in mongodb

I looked into answers but nothing works for me in mongo 2.6.11 cluster 'nms' (members nms01m and nms02) below. I want my current secondary nms01m to become primary, and now nms02 is primary instead of ...
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81 views

Force a Member to Become Primary when Primary fails in mobgodb

I have mongodb 2.6.11 cluster of two members: nms02 and nms01m. I know how to force secondary to become primary when primary is avail. But now my primary nms02 failed..and nms01m is secondary...How I ...
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331 views

SQL Server failover cluster installation fails on primary node

I'm trying to install SQL Server 2014 fail-over cluster, but the installation fails with following log i have tried a lot of things but without any success.. The installation failed with following ...
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140 views

Is is possible to convert SQL Server from single instance to failover clustered node?

If SQL Server 2014 Enterprise has already been installed, can it still be converted/added to a failover cluster? Specific scenario - Amazon EC2 instance of Windows 2012 + SQL Server 2014 (license ...
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121 views

Change port number for SQL 2012 Cluster

I have been trying to change the port number of a SQL 2012 cluster with little success. I had thought that I could just do this the same way as normal through configuration manager however, even with ...
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54 views

SQL Server - How does Always On in a shared nothing config maintain transaction durability during a failover?

I've been reading up on Always On, and I was wondering how transactional durability is maintained during a failover when using a shared nothing configuration. The only things I can find on google ...
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119 views

Would SQL Server in a Cluster failover if it is running out of RAM

I have a SQL Server 2008 R2 in a Cluster in an active-passive mode. The server is running out of RAM (both physical and pagefile). In the instance level settings there is not Max RAM set (set to the ...
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29 views

PGBouncer pausing hanging from ltm monitor

Currently I have the following setup: F5LTM --> PGBx2 --> DBx3 The PGBouncers are set up with priority groups on the F5 so in the event one fails or hangs traffic will still be sent to the database ...
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What are the typical errors that cause sql server to failover in a cluster [closed]

I have a two-nodes cluster with active-passive applied for a single instance of SQL Server 2008 R2. What would be the typical reasons the instance will fail over to the passive node?
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1answer
107 views

Availability Groups - Can async replica delay failover of sync replica?

Availability Groups SQL Server 2012. Node 1 and Node 2 in primary data centre - sync mode for HA Node 3 in dr data centre - async mode for DR If a manual failover is performed between node 1 and ...
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166 views

SQL Server does not failback to the primary node

We are running SQL Server 2008 R2 on a Windows Server 2008 R2 two-node cluster. My choice of machine is primary, and the secondary is just a low-end machine for contingency planing. We had a ...
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2answers
190 views

MySQL InnoDB over a Raw Device in an Active/Passive topology

We have an Active/Passive topology where there are two x86 complexes with a shared raw storage, where only one of the nodes in a given moment has an access to the shared storage (AKA the active node). ...
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1answer
257 views

SQL Server 2012 Always On Setup with two nodes

I have AlwaysOn setup with two data nodes and one witness. I faced an issue where my PRIMARY Server restarted abruptly. Here're some issues I faced during this timeframe. Due to abrupt restart of ...
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1answer
934 views

How do I configure AWS Aurora to separate write/read operations

I want to migrate my database instance from AWS RDS MySQL to Aurora, but I have a doubt about replication and how Aurora management the write/read operations. I have my application and I want to ...
2
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1answer
111 views

SQL Server (2014) Failover Cluster Performance with many databases

We are considering implementing SQL failover clustering and I have a question about how SQL Failover clustering works with regards to performance. Specifically, we would have about 1000 dbs mounted ...
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65 views

Failover timeout problem

I'm looking for an additional bit of help with regard to some problems I'm looking at for one of my company's clients. Basically I have two related problems with regard to a 2-node active/active ...
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64 views

SQL Server - Company wants HA for single instance with 1 userDB - sanity check and questions

I am new to SQL Server (2 months) and learning at a gov company (europe). The job is to make a HA solution for this 1 productive instance (1 database). Following is given SQL Server 2012 Windows ...
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183 views

Restart the active node services without failover [closed]

On a 2 node cluster configuration, How to restart the SQL services on the Active node without failing over on to another node?
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38 views

Queries running slower on production (failover cluster) than on homologation env [duplicate]

I have a Windows Server 2012 cluster with two nodes running SQL Server 2012 for production and a Windows 2012 single server with SQL Server 2012 for homologation. I just restored the production ...