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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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 ...
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1answer
46 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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19 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
37 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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23 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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51 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 ...
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19 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 ...
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2answers
51 views

Error creating database on new storage in SQL Server 2008 R2 Failover Cluster

Via the Failover Cluster Manager, I recently added a new disk to an existing SQL Server 2008 R2 Cluster, running on Windows Server 2012 R2. When attempting to create a database on this new storage, I ...
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34 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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29 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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25 views

VIP to VIP Failover

I have a VIP named sqlserver01 under it are physical servers nodes: node01 and node03 I have another VIP named sqlserver02 under it are nodes: node02 and node04 Is there a possible way that I can ...
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1answer
297 views

Postgres 9.4, replication slots, doesn't work failover master

I've installed postgres master and slave nodes by this manual: At the master (10.0.0.1): sudo -u postgres initdb -D /data/postgres/main Change postgresql.conf: listen_addresses = '*' wal_level = ...
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1answer
63 views

SQL Server Failover Cluster Instance compatible with VMware HA?

Imaginary Setup: Microsoft SQL Server Failover Cluster Instance on virtual machine in an ESX-Cluster. Question: In case of a hardware failure, what will happen with both high availability ...
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52 views

SQL Server Mirroring (with Witness) and Client Timeouts

Can you explain what happens in this situation. Imagine I have a Sql Server Mirroring set-up with 2 databases and 1 witness. Database clients have in their ConnectionStrings the Principal= and ...
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1answer
54 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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55 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 ...
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144 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 ...
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1answer
26 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 ...
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31 views

MySQL ODBC Mirror/Failover

I am wondering if it is possible with the Windows MySQL ODBC driver to mirror the data writing on a local (Access) database or, at least, to write on the local database if the writing on the remote ...
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47 views

Filestream on a SQL Cluster during failover sits at 'Pending Recovery'

We have an application using FILESTREAM storage which is also hosted on a SQL cluster. Unfortunately, when we fail the SQL cluster over between say, node 1 and node 2, it works on one node, but when ...
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2answers
35 views

High Availability using SQL Server 2012 requires how many licenses [closed]

For on premise solution, is it possible to implement high availability for SQL Server 2012 using a single license, or, one needs to buy extra licenses? Also, for high availability with SQL Server, ...
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1answer
76 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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1answer
28 views

MongoDB failover reasons

I have a replica set on MongoDB with 3 members - primary, secondary and arbiter. One day I came and saw that primary and secondary have switched. I'd like to find a reason for the failover that caused ...
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1answer
61 views

Agent service account shows as not clustered

One of the SQL Server 2008 R2 instances I administer is running on a two node Windows Cluster (Windows Server 2008 R2 Enterprise) When I run the DMV sys.dm_server_services, SQL Server Service Account ...
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99 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 ...
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2answers
226 views

Best DR strategy for MS SQL Failover Cluster [closed]

I have... 2 database servers 1 shared SAN storage 2 MSSQL 2012R2 (Standard) server instances (2 SQL Failover Cluster) Server A is the primary node for SQL Instance A Server B is the primary node for ...
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46 views

Can I revert to local logging in IIS 7.5 if ODBC fails? [closed]

Environment I have 3 Servers running instances of IIS 7.5 hosting different websites. 1 Server is on Domain A, 2 Servers are on Domain B. I have a one way trust setup from Domain A to Domain B. SQL ...
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15 views

How to configure Mysql database for highavailability and failover? [duplicate]

I have a web application written in java with Mysql database. I want to ensure high availability of my database server, hence i have configured master-slave replication mode. All my reads goes to ...
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1answer
136 views

Error while duplicating Oracle database after failover, using 11.2.0.4

I've recently updated oracle from version 11.2.0.1 to 11.2.0.4 and my redundant system is no longer able to recover from failover. I'm using scripts both on primary and standby node to get back to a ...
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1answer
111 views

Postgresql - Streaming replication - STONITH

Current situation: PostgreSQL, streaming replication Master failed, I created the trigger file. Slave is promoted to new master After the old master restarted successfully, I have to create base ...
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1answer
207 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 ...
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121 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 ...
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1answer
332 views

Breaking changes between 2008R2 RTM going to 2008R2 SP3?

I have a few A/P FCIs running 2008R2 RTM, and I'd like to upgrade the passive node to SP3, fail over, and then upgrade the formerly passive node. Has anyone else attempted this? Are there breaking ...
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512 views

pgpool-II Master Slave mode / Load Balance Mode / Watchdog On result many primary servers

I installed pgpool-II in Centos6.5, Master Slave mode / Load Balance Mode / Watchdog On but three postgresql servers are all primary server, shows as below: IP Address Port Status Weight ...
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224 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
131 views

Effects of renaming FC and using its original name for AG network name

We have a Failover Cluster, named MainSQL consisting of MainSQL01 and MailSQL02 which are default named instances and we can connect to whichever is the active node with just simply MainSQL. If we ...
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216 views

how to change the backend order in pgpool

I want to change the backends order in pgpool. I want to keep my master host always as the first backend. I have been configure the failover command: NEW_MASTER_INFO=($(PcpNodeInfo ...
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2answers
659 views

MS SQL Server 2012 Log Shipping Questions

I have a few questions regarding Log Shipping in SQL Server 2012. If the primary database server dies, is it possible to allow users to connect to the secondary database so as to continue working ...
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1answer
130 views

MongoDB failover process

Hello guys I've been all over the MongoDB documentation (http://docs.mongodb.org) and I can't find a solution to my problem. Imagine the following scenario: I have 2 Nodes (1000Km apart). Both nodes ...
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1answer
327 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
82 views

Mysql Server version: 5.0.77-log Source distribution

I have a master(M)-slave(S) replication on MySQL. During a failover test, the master was brought down and the slave was made the master by doing STOP SLAVE; RESET MASTER;. Since there are only 2 ...
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1answer
65 views

Several mongod instances that do automatic failover without duplication of data?

Because we don't have much storage space and we already have a RAID system for data availability, we don't want to use mongodb's replication set with duplication of data. I just want to know if ...
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142 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. ...
3
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1answer
628 views

Promotion of PostgreSQL standby and application reconnection

Background: I work for a small company. We have been using PostgreSQL on Heroku as one of our core technologies. While, in general, we've been happy with Heroku, the company has made the decision ...
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1answer
338 views

PostgreSQL Automatic Failover (Trigger File Creation)?

Is there a way to detect if the master PostgreSQL (9.3) server becomes unresponsive, and if so, create the trigger file (that is specified in recovery.conf) that initiates the failover process? Or ...
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2answers
648 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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1answer
444 views

MongoDB: Manual failover and failback between two datacenters?

This is about MongoDB and datacenter failover and failback. We're thinking about using two datacenters and this MongoDB replica set: DC1-M1 prio 1, votes 1 (datacenter 1, member 1) DC1-M2 prio 1, ...
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1answer
360 views

Complete Failover Cluster Failure SQL Server 2012

We have experienced a full cluster failure on our 3 node cluster running SQL Server 2008 R2 with 7 SQL Server instances. It started when we rebooted one of the nodes and it returned an error: Node ...
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1answer
287 views

Log shipping - failed over to secondary, how to fail back

SQL 2012 I've been researching and testing Log Shipping as a DR solution. I got the two servers setup. Log shipping is in place and verified to be working correctly. I failed over by restoring the ...
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37 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 ...