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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2answers
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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 ...
4
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1answer
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 ...
3
votes
1answer
63 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 ...
3
votes
1answer
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 ...
2
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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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1answer
81 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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1answer
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 ...
1
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1answer
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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1answer
50 views

Failover Cluster Instance work without quorum

I have a environment with three nodes with installed SQL Server on them. All three nodes are parts of FCI and quorum setting is Node Majority. In start, first node is role owner, and all three nodes ...
3
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0answers
74 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 ...
3
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0answers
763 views

Postgres Streaming Replication: How to re-sync data in master (with standby) after failover

I am absolutely new to postgres 9.1 replication mechanisms. I have managed to set up streaming replication between a master and standby postgres (Both have x number of records). At one point when ...
3
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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 fine,...
2
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0answers
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 ...
2
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0answers
118 views

Are there any best practices before moving SQL Server to another node (controlled failover)?

Let's say there are multiple jobs running on the SQL Server - we have index maintenance jobs, backups, replication, etc. We would like to perform a switchover using Failover Cluster Manager. Are there ...
1
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0answers
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 ...
1
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0answers
51 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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0answers
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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0answers
139 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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0answers
238 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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0answers
36 views

Quorum disk conundrum

I'm working on a problem for one of my company's clients where they are having a problem with their 2-node active-active cluster and which has been failing over lately but not bringing resources back ...
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0answers
302 views

ComputerNamePhysicalNetBIOS and “Current Host Server” shows different machines

I have a SQL Server 2008 R2 instance on a two node (say names X and Y) windows server cluster (Windows Server 2008 R2 Enterprise). Server Manager on both nodes shows 'X' as the 'Current Host Server'...
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0answers
212 views

Prevent SQL Server failback after cluster aware updating

We have SQL Server 2012 in a two-node cluster with Windows Server 2012 (node and disk majority). Neither of the nodes are marked as preferred owner and the "Prevent Failback" option is selected. ...
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0answers
44 views

Windows Clustering 2008 R2

I'm trying to build a Windows cluster with 3 nodes, 2 Active and 1 Passive, And If I have to build in a way like N1 Active - N3 Passive will be refer as "cluster network 1" and N2 Active and N3 ...
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0answers
137 views

Failover cluster connection issue

I'm trying to run SQL Server Failover cluster in Azure. I have NODE1 and NODE2 in a cluster and another SERVER in the same network trying to connect to the database server using the instance from ...
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0answers
765 views

AlwaysOn Availability Group: Users on Secondary Server

We have an AlwaysOn Availability Group setup (DB1+DB2) and also a web server (Web1) outside of the domain that we need to connect to the AG using Windows Authentication. The following Windows Users/...
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0answers
339 views

Postgresql Streaming Replication - pgpool2 - failover

In my scenario I want pgpool to forward read only queries to slaves when the master goes down - I want my app to be in the "read only mode". How do I setup pgpool to accept read only queries when ...
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0answers
146 views

Any solution to fix circular replication fail-over?

I've developed a point-of-sale system for our corporation, which has 25+ branches across the country. Each branch has its own MySQL POS database on a WAMP server. I want every event that occurs in ...
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0answers
422 views

SQL Server 2012 Failover Cluster and attached SAN

I have three servers in a Windows Server failover cluster. SQL Server 2012 Failover Cluster is installed on all nodes. I have an issue with shared disks attached from SAN. overview with the same ...
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0answers
1k views

Can't set up witness in Repmgr 2.0

I am trying to setup repmgr using the autofailover quick setup tutorial provided on Github Link But I am kind of stuck on the witness section, when trying to create the witness with repmgr -d repmgr -...
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0answers
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 ...
0
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0answers
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 ...
0
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0answers
22 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 ...
0
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0answers
58 views

Mirroring DB failover, and found Schema different

I set two database mirroring with Safety OFF. Once I do failover to mirroring DB, I found there are some Stored Procedure Schema different. Does anyone have same problem before ? What is the root ...
0
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0answers
115 views

Converting MySQL master-master replication to master-standby

I set up two mysql servers in a master-master configuration. This was working fine until recently when I encountered a duplicate-key problem. After doing some research and evaluating my needs, I ...
0
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0answers
200 views

MySQL Master-Master-Slave failover

I have setup a Master-Master configuration in MySQL with one additional slave, like this: Master1 <-> Master2 <- Slave Master1 is the write master used by my application, Master2 is used ...
0
votes
0answers
98 views

PostgreSQL Failover strategy

I'm lost when it comes to choose the failover technology for my postgresql database. The options I currently see are: PG Cluster Streaming Replication Warm Standby (log shipping?) Hot Standby Is ...
0
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0answers
344 views

Is there failover server parameter in PostgreSQL connection string?

Is there failover server parameter in PostgreSQL connection string that can be used to automatically switch from primary server to secondary sever ? We have been using similar functionality on MS SQL ...