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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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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1answer
15 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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1answer
237 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
34 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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2answers
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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1answer
237 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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0answers
56 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
643 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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1answer
41 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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1answer
183 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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3answers
993 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
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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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51 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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0answers
25 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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1answer
40 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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0answers
121 views

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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0answers
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 ...
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2answers
67 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 ...
2
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1answer
131 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 ...
32
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4answers
20k 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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1answer
67 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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1answer
41 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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2answers
76 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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1answer
50 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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273 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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101 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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1answer
80 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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1answer
51 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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2answers
101 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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28 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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1answer
40 views

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
80 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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1answer
122 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
179 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). ...
2
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1answer
208 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 ...
2
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1answer
703 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
99 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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1answer
58 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 ...
3
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1answer
62 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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1answer
156 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 ...
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21 views

Create db2 alert for automatic failover

We have two servers in automated failover HADR (TSA installed and haicu configured). How can we create an alert that fires when a failover happens i.e. when the primary server goes down and the ...
2
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1answer
404 views

SQL Server Mirroring and automatic failover - why don't all DBs failover to the mirror?

On SQL Server 2008 R2, I'm mirroring 20 databases on my SharePoint SQL Server with a witness, high-safety. All mirrored DBs have the default mirroring_connection_timeout = 10. And, occasionally, a ...
3
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1answer
56 views

SQL Server 2014 Availability Group failed

I have 3 servers on VMware workstation: Win 2012 R2 as ADDC -Cluster service. Win 2012 R2 as SQL server primary replica . Win 2012 R2 as SQL server secondary replica (auto fail-over). My ...
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222 views

Redis Cluster monitoring

In some limited testing with Redis Cluster I've identified the following conditions where a failed master would be unable to failover: The obvious, all the slaves have failed All of a master's slaves ...
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1answer
376 views

Postgres automatic failover, multiple clients to multiple masters

I'm looking into providing a method of having multiple hot spare PostgreSQL instances to our website. The majority of implementations that I have found require a single point of failure with PgPool ...
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1answer
69 views

Manual sql failover machine with replication

I hope this is the correct place to ask this question. We recently experienced one of our virtual machines being offline for 3 days due to issues in the data center hosting it. This quickly brought us ...
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0answers
68 views

PostgreSQL Streaming Replication Tools - Windows

Is there any clusterware available for PostgreSQL clusters running on Windows OS? I'm specifically interested in automatic failover and STONITH functionality. I've done a fairly extensive Google ...
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34 views

Test Failover SQL Server 2012 [closed]

I have created simple FAILOVER cluster in SQL Server 2014 on Windows Server 2012 R2. This is my development lab and never worked on have a fail over cluster with SAN. As this is my development lab ...