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Questions tagged [failover]

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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Data Loss when forced failed over to secondary replica on Sql Server 2014

Setup: 2 Availability Groups 2 Replicas on Synchronous Commits. 1 Replica on Asynchronous Commit. Automatic Failover configured for the two replicas on Synchronous Commits. Manual Failover ...
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70 views

DATABASE lacks a quorum of nodes for high availability

Just after setting up successfully alwayson - availability group, testing the failover, I get this error message: TITLE: Microsoft SQL Server Management Studio Failed to resume data movement in ...
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How to fail over availability groups on multiple remote servers

We have many SQL Server installations with availability groups. During our maintenance window, we will need to fail over all the HA groups to secondaries, patch the primary servers, then fail back, ...
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Windows 2016 Workgroup failover cluster

I am building a two node Window failover cluster for SQL Server AG. I am getting following errors in the cluster log. Please help me to resolve the error. Thanks
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32 views

MySQL failover: how application can be switched to a new master in master-slave configuration?

In my case I have two MySQL servers. One is master and second one is slave. When slave is not available, my application can read and write from/to master. When master is not available, assume there ...
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94 views

PostgreSQL: pg_rewind complains about wal_log_hints = on not been set, it is

I'm rather new to pg so please bear with me. I've set up two hosts and installed pg10 on both. Then I configured log streaming replication between them. This worked fine. I wanted to test fail over,...
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55 views

Sync PostgreSQL with Cloud and multi Local Locations

I need help with a complex (for me) multi server setup with PostgreSQL. I have to setup a Cloud Server and 3 Local Servers for our company. Each Server will have: Linux Ubuntu 16.04 Docker ...
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Enabling FileStream in existing clustered servers in SQL Server 2012

I have heard that enabling FileStream in an already existing clustered environment is tough. I'm working on a consolidation project and currently analyzing the impact it will have if we migrated DBs ...
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17 views

AlwaysOn Replicas set to manual but failing automatically

My two synchronous-commit SQL AO replicas are set for manual failover mode but are failing over automatically. When I look through the logs and extended events, it looks just like what would happen if ...
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35 views

Availability Group Upgrade 2012 to 2016 Data Move

I'm working with a team to upgrade a four node AlwaysOn Availability Group from SQL Server 2012 to 2016. Two of the nodes are local and two are in Azure. The database holds a large amount of data (2 ...
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61 views

TDE Enabled DB Always Going Into “Recovery Pending” on Secondary Node [duplicate]

I have a Windows Failover Cluster set up with SQL 2016 Enterprise SP2. TDE was implemented on a DB, on node1 the DB is able to start without issues. However, when a failover occurs, on node2 the DB ...
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25 views

Automate setting secondary node to primary when majority nodes are down-MongoDB

There are many ways to force a secondary node to become a primary when majority nodes are down in mongo replica set. But we need to do this manually. For eg, forcing reconfig: cfg = rs.conf(); cfg....
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28 views

Remove Windows FCI completely

When I built the cluster I forgot to uncheck the storage. It's now giving me all sorts of errors. How can completely remove the cluster so I can rebuild it? This is a 3 node cluster and I evicted two ...
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81 views

MultiSubnet Failover with RegisterAllProvidersIP 1

I am using a 2 node SQL AG (2014 EE) (each on a different subnet) and the Listener is configured with 2 Static IPs. The client application uses SQL Native Client 11.4. My understanding is that this ...
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7 views

Keeping INSTANCE_NAME on Data Guard failover

I have a legacy application which uses a lot of PL/SQL stored procedures. It has a deeply ingrained need to know in which environment it is running, and uses the INSTANCE_NAME for that. For the sake ...
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86 views

Listener IP not changing after failover

We have a multi-subnet AlwaysOn availability group. There are 2 subnets and those are listed on the cluster and also the listener. Whenever I fail over and ping by the listener name it still shows ...
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58 views

File Share Witness with 4 Node Cluster

I am building a cluster of 4 nodes along with a file share witness. Every month due to server updates the server that holds the file share will need to be rebooted. My question is while the file ...
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1answer
65 views

Sync Login PW across Multiple Instances

When attempting to failover many logins fail due to nonmatching passwords on both instances. Is there a way for me to replicate passwords to other servers for all logins which passwords do not match.
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Azure automatic fail-over vs always on availability groups clarification

I am trying to understand automatic failover vs always on availability groups in Azure hybrid and geo-region situations: Is it possible to have on-premises SQL databases, VM SQL databases and Azure ...
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97 views

Why is my DR AG database in the “recovery pending” state?

I am trying to build an architecture where we get automatic failover for both HA and DR for our DBs using SQL Server 2016 AlwaysOn Availability Groups. When I tested this using only one Availability ...
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1answer
97 views

Automatic fail over in Always on availability group with 3 Node in synchronous mode and 1 Node in Asynchronous Mode

I am laying out a plan where there will be 3 Node on site with automatic fail over with synchronous mode and 1 remote replica with asynchronous mode. My question is if the primary goes down which node ...
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23 views

Why use Failover replica on Google Cloud RDS?

we are thinking of migrating our MySQL database from our dedicated server to a Google Cloud RDS instance. However I would like to clarify the below: 1) What is the purpose of creating a failover ...
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1answer
258 views

Edition upgrade on SQL Server failover clustered instance

We did Edition upgrade on our active node for the SQL Server instance SQL01 and that was successful. I have a question/doubt --> Do I need to proceed the same on other node as well since SQL Server ...
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143 views

IP address to use with FCI, Always On AG and Always On (AG) FCI

My understanding is that HA can be achieved using either of the below and my concern was which IP address should client applications use when connecting to SQL Server: Failover Clustering: For this ...
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1answer
111 views

Automatic failover (Clustering/Always On AG)

Let's says we have 2 nodes (N1, N2) clustered (say C1) on-site. And an Always On AG is configured between this cluster C1 and a new SQL server instance N3 (N3 is off-site). Now, if there is a problem ...
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72 views

Moving tempdb from shared to local drive in a failover cluster

We have an existing failover cluster that I would like to have the tempdb in local drive. I'm not sure how to proceed. My thought process is below: Create two drives on each node one for tempdb and ...
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Always ON - What is the difference between the virtual cluster name and Listener

In clustering you specify DNS name/IP address of cluster that is then used by all applications. In case of failover, the same DNS name/IP address will point to the appropriate database server. In ...
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3k views

Always On Failover Clustering vs Always On Availability Groups

I have some concerns over my understanding of SQL Server Always On. Kindly can you correct me (conceptually) where needed: Always On Clustering and Always On Availability Groups are 2 separate ...
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63 views

Switch-SQLAvailability error during DB Restore in AlwaysON Group

Can anyone share your inputs on below and how to fix the issue and possible causes of failure? I am trying to restore a DB using PS script and at one step it is failing during the role change test ...
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1answer
244 views

Availability Groups Failover Readinness “No data loss” and rollback of nonqualified transactions

I have Availability Groups with Synchronous Replication and Automatic Failover setup with SQL Server 2016 SP2 in my production environment. I want to do a manual failover for patching and I have ...
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1answer
246 views

Pausing the secondary Replicas for a day in always on availability group

We are planning to make the DR as primary and do maintenance on the secondary site(Formerly Primary Site) and hence pausing both the secondaries in always on availability group for a day. I am aware ...
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1answer
242 views

Repmgr: Error to promote Standby Cluster to Master Cluster in failover

I maked the configuration of the failover system based in Repmgr, but i don't haved success to promote the Standby Cluster to Master Cluster in case of failover. Following my configurations, this ...
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83 views

Any Reason to have Regular Failover Clustering in Azure Cloud?

Is there a reason to have Regular SQL Failover Clustering when database is in Azure Cloud? I understand the benefits having Availability Groups in Azure Cloud for Database-Level protection. People ...
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57 views

Shouldn't Windows Server Failover Clustering already take care of SQLServer Failover Clustering?

After reading this question, Are "Always On Failover Cluster Instances" and "SQL Server Failover Clustering" the same thing? If Windows Server Failover Clustering is installed, ...
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120 views

Azure Failover Clustering vs On Premise Failover Clustering

Azure AlwaysOn FCI Failover Clustering IaaS VMs seem to have a different diagram compared to On-Premise Failover Clustering. Azure has two storage for 2 Vms; Traditional On-Premise contains 1 Shared ...
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78 views

Is it a common pattern in having two AlwaysOn Availability Groups for DR and Reporting?

We have a primary OLTP server in the cloud. We intend to have Synchronous Alwayson Availability Group for Disaster Recovery, and another Availability Group AAG for Ad-hoc Query Reporting. This way ...
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33 views

Failover from Primary to Asyn Secondary Replica

In my environment we have 1 Primary 1 Synchornous Secondary and 1 Asynchronous Secondary Replica (Off site). We are planning to do a manual failover to the Asynchronous Secondary Replica (Off site) ...
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399 views

VMWare Windows Failover Clustering - Cluster Node Removed

We have a 2012 Windows failover Cluster set up for SQL Server 2014 on VMWare ESXi, 6.0.0, 3620759. A couple weekends ago, our Server Admin made some updates to the the UCS Manager software, which in ...
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39 views

Migrating Oracle 11G Fail Safe to new hardware? Multiple Cluster Nodes

We have a 11G 2 Node Active \ Passive Failover configuration that we want to move to new hardware. Is it possible to have 4 nodes running temporarily while we move everything over? I.E. 1 Active and ...
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171 views

SQL Server 2014 Standard FCI Does Not Failover

Have a peculiar case where a previously working FCI, after installing a large backlog of Windows updates, is now failing often and not failing over. On occasion, and this appears to happen around ...
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248 views

How do I automatically enable or disable report jobs at AOAG failover?

I have an AlwaysOn Availability Group with 2 DB servers. I'm attempting to use SQL Server Agent Alerts to programmatically disable a handful of SQL Server Agent jobs (that must not run on a secondary) ...
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1answer
195 views

Migrating Production SQL Servers (Availability Group) from one data center to another - questions

We have two SQL servers combined into Availability Group in data center 1 (dc1): dc1 server 1: SQL Server 2012 SP3 on Windows Server 2016 dc1 server 2: SQL Server 2012 SP3 on Windows Server 2012 R2 ...
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675 views

MongoDB Replica Set Failover due to unreachable SECONDARY resulted in Rollback

I have a 3 member replica set with 1 primary, 1 secondary and 1 arbiter. Due to some apparent network issue, the secondary was unreachable. After some time, the secondary became the primary and caused ...
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1answer
298 views

do single AZ AWS RDS instances self heal?

I'm aware of "multi AZ" databases "auto failing over" if one side goes down. My question is, if you have a single AZ RDS database, and the database box "dies" does AWS automatically spin up a new one ...
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1answer
837 views

Availability Group, asynchronous mode, manual/forced failover - handling identity overlap

We have a two replica 2017 Standard Availability Group in asynchronous mode. With a failover (manual/forced, since can't do automatic), we have the potential for overlapping/reused identity values if ...
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1answer
267 views

Log Shipping failover when Primary is not accessible

Log Shipping Failover I have set up log Shipping with Cluster. In this scenario I want to simulate a situation when the whole cluster becomes inaccessible. My Steps for failover will be 1) Copy ...
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1answer
258 views

Why configuring automatic failover for SQL availibility group feature on sql failover cluster instance not allowed

I have set up an availability group where a primary is standalone server and replica is SQL failover cluster. This setup allows me only manual failover and when ever I try to set it automatic in FCI ...
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1answer
490 views

Can auto failover cause split-brain? (SQL AlwaysOn)

I have been studying Cluster voting and AlwaysOn failover. The topic of split-brain comes up and sounds terrible. This following from Microsoft seems to indicate that only a person with SA, doing ...
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1answer
169 views

How to prevent data loss during intra-site failover

We are looking to build a MS SQL server (either SQL server 2016 standard or enterprise edition) solution but are having some troubles. This post can be lengthy and if you think it is TLDR, our ...
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2answers
420 views

SQL Failover Clustering with Availability Groups: Single or Multiple Databases

Company wants to implement AlwaysOn SQL Failover Clustering with Availability Groups, for server level and data protection. Are arrangements below, only possible if 1 database is on the server, or ...