Questions tagged [clustering]

A cluster consists of a group of computers connected so that in many respects they can be viewed as a single system.

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remove Analysis service from a SQL 2014 cluster

Is it possible to uninstall Analysis service from a SQL 2014 cluster. I’ve seen that it cannot be done in 2008/12. I’m hoping that this maybe fixed now
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Cassandara ec2 Number of Nodes and autoscale for increasing 70Gb of Data

I am beginner in Cassandra, I currently have 72 GBs of Data that is growing and i will have approximately 1gbs inserted into database daily. How can i decide number of nodes in the cluster and how ...
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Cannot create login on cluster

I have a SQL Server 2008 R2 cluster on Win2008 R2. I am unable to add a login for the service account. Any other login I add to this instance works fine and I have been able to add the same ...
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What are the differences between Mirroring and Failover Clustering and when is each one recommended over the other?

What are the main differences between Mirroring and Failover Clustering? What kind of problem each one solves and in what kind of scenarios is each one recommended over the other?
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Not able to add a node into windows failover cluster

I had two node cluster but due to disk corruption one node was removed. After maintenance when second node came back we tried to add it into the cluster but getting exception. I checked the even log ...
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Error in WSFC Role while applying SQL 2016 CU7 in Multiple SQL instance environment

Kindly advise on following error: Cluster resource 'AG1_NAME' of type 'SQL Server Availability Group' in clustered role 'AG1_NAME' failed Based on the failure policies for the resource and role, the ...
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1answer
222 views

SQL Server 2016 Cluster - mail works in alerts; sp_send_dbmail dosen't send in jobs

I upgraded from 2008 R2 to a 2016 cluster [Microsoft SQL Server 2016 (SP1) (KB3182545) - 13.0.4001.0 (X64)]. We have some scheduled emails that happen from the agent that are reporting success as the ...
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232 views

SQLDIAG File in the SQL log folder

There were few inconsistency issues in our database and this happened because of unsuccessful fail-over of DB server(WSFC), same was asked in this question and is resolved last night after dropping ...
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1answer
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SQL Server takes an hour to fail over to secondary node

I am at a new job, we have a 2008 R2 (SP1) WSFC which hosts SQL Server 2008 FCI. Each node has it's own storage, nodes are 32 core with 32 GB memory (don't ask me why it is configured this way). ...
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1answer
186 views

Checkdb issue - Consistency error on two tables at critical database

There was a network activity last night and they were upgrading server switch. Whole network was down and we as a DBA had prepared by disabling all the jobs at DB server for replication and backup ...
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When does the quarantinethreshold counter reset in WSFC cluster?

An outage that occurred on our SQL availability group this morning caused us to look into the quarantine settings on WSFC - something we never needed to configure. Now there seems to only be two ...
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1answer
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How to monitor a file share witness for accessibility

In the context of a SQL Server Availability Group, what's the best way to monitor a file share witness for accessibility? I want to make sure the witness can be accessed by the Availability Group ...
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667 views

Manual failover of AAG in SQL Server 2012

Just a question regarding manual failovers. Does it matter if we use SSMS to perform the failover vs going to the Failover Cluster Manager and move the role to the secondary node? Is there a ...
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1answer
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Why am I unable to create this Availability Group? (error 35220)

I was attempting to create an Availability Group on a SQL Server 2017 instance and was running into error 35220: Could not process the operation. Always On Availability Groups replica manager is ...
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2answers
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Restart the active node services without failover

On a 2 node Windows Server Failover cluster configuration, how do I restart the SQL Server services without failing over to the other node?
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2answers
668 views

Clustering SSAS

We are using both SQL Server 2012 and 2014 always on. Here is my issue: we have an application that I have set up to use Availability groups(2014), however the issue I am having is that it uses ...
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1answer
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SQL Server Clustering - Active/Active or Active/Passive?

What is the logic of the Active/Active cluster vs Active/Passive cluster? I have searched a lot and read lots of documents but have not found the answer. In active active cluster can I have 1 ...
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978 views

SQL SERVER 2014 FCI Cluster taking too long to failover

I support a multi-instance, two node failover cluster (active-active). Both instances are running SQL 2014, on Windows Server 2008R2. The nodes each have 3/4 TB of memory and 32 cores (64 with HT). ...
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643 views

SQL alwayson manual Failover Cluster failed because a duplicate IP address detected

When I manually tried to make a failover I got the following errors: "SQL always on Cluster IP address resource listener cannot be brought online because a duplicate IP address was detected on the ...
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262 views

Powershell Missing Cluster Name for FCI

I'm running the following simple Powershell command. $Server = New-Object ('Microsoft.SqlServer.Management.Smo.Server') 'SerName' $Server | SELECT * For FCI clusters the ClusterName value is always ...
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274 views

mysql 8 innodb clustering - adding instance fails with error “Unknown database 'mysql_innodb_cluster_metadata'”

I'm setting up my first mysql innodb cluster, following the instructions here: https://dev.mysql.com/doc/refman/8.0/en/mysql-innodb-cluster-production-deployment.html I've configured the instances ...
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3answers
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SQL Server Always On Node and File Share Majority

I am looking for some guidance on architecting our SQL Server 2016 SP1 Always On Availability Groups HADR solution on Windows Server 2012 R2. We have a primary site A with a primary replica and a ...
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1answer
763 views

Automatic Failover on SQL Server Always On Availability Groups is not triggered when primary replica becomes offline

I have set up a 2-node Always On Availability Group. Both replicas are in synchronous mode with automatic failover. If I perform a manual failover, everything works as expected: Primary and Secondary ...
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436 views

GFS2 as shared storage for MySQL cluster with active active setting

I am using MySQL 5.7 on RHEL 7.1. For cluster management I am using Pacemaker and corosync. For shared storage, I am using GFS2 file system with iSCSI server I am trying to implement MySQL active-...
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176 views

Dynamic quorum and Dynamic witness in Always On AG 2016

I have a Always On AG 2016, configured on Windows Server 2012 R2 – 2 node cluster. Quorum configured as 2 nodes + Fileshare witness, totally 3 votes. Scenario 1: Now, either 1 node fails – remaining ...
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313 views

Add Secondary Node to existing WSFC Cluster

I need to add new server in my existing WSFC cluster server setup. I need few details on following : 1. I have Windows Server Failover Cluster setup on 2012 R2 with SQL Server 2012, Can I have my new ...
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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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390 views

SQL Server AlwaysOn Availability Groups Cluster File Share Permissions

Just need to double confirm, when setting up the file share witness to act as a quorum vote in the HA cluster - does each server node within the cluster need access to that file share or is it just ...
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2answers
827 views

Alternative to CLUSTER without table lock

I'm facing performance degradation and increasing storage usage as a result of frequent new and updated records causing index and storage fragmentation. VACUUM doesn't help much. Unfortunetely ...
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2answers
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SQL Server Always On File Share Witness (Quorum vote) on different subnet to other nodes

I am currently having issues with some of my Availability groups where node 1 and node 2 loose connectivity between each other "A connection timeout has occurred on a previously established connection ...
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2answers
881 views

Evict node from SQL Server 2016 Cluster on Windows Core

I have 4 nodes cluster on Windows Core with SQL Server 2016 installed on them (4 instances, 1 instance on each node). I would like to remove 2 nodes from the cluster (2 instances aren't needed). I ...
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1answer
212 views

Upgrade SQL Server 2014 Failover Cluster to SQL Server 2016 Availability Group on Windows Server 2016

In our current set up we have 2 node SQL failover cluster in data center DC1 with mirroring enabled. And similarly in DC 2 a 2 node SQL failover cluster. DC1 acts as primary via DB mirroring in one ...
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2answers
363 views

Vertical / Horizontal Scaling Disk Size MySQL or MariaDB

I have been looking into this for a while and cannot find a suitable solution so would like to know if someone here can please help. I am trying to set up database back-end that will assist with ...
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285 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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Alwayson AG lease timeout and healthcheck timeout [closed]

We have a physical SQL Server 2016 Enterprise SP2 with two instances and each instance contains one AG. Sometimes it happens that one AG goes to resolving (without failover), the cluster resource is ...
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1answer
352 views

An error occurred on the always on dashboard

I have a setup of Windows Server Failover Cluster and i am using SQL Server Service with one DC, One Primary Server and One Secondary Server. During Using SQL Server Management Studio, when i click ...
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Current Host Server for Availability Groups [duplicate]

We have a 4 Node multi Subnet Availability Group. When i go to the Cluster Manager I could see the Current host server is the Node 4 whereas the AG Primary node is Node 1. Will the AG go down if Node ...
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28 views

Configure Availability Group in SQL Server 2016

Can you tell me how you add the second node as the replica to the AG? I am using this feature on AWS instances, I have followed all the steps as shown in different videos, but when I try to add the ...
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167 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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129 views

Do you connect an application to the load balancer name or the cluster name?

My DBA delivered a 2 server WSCF for me to connect my sharepoint farm to. I have a load balancer name and a windows cluster name, and 2 server names. I realize I need to connect either to the ...
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58 views

Can a query whose execution plan uses parallelization use the cores of a processor on a another server that's part of the same Availability Group?

If I have two servers (server A and server B) that are part of the same Availability Group failover cluster, and a query running on server A has an execution plan that uses parallelization, is it ...
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87 views

Can an AlwaysOn Availability Group be used to mitigate downtime when there's replication syncing issues on the primary server?

Once in a while I'll run into syncing issues with my subscriber server in a transactional replication setup. Taking a new snapshot of the publisher causes significant downtime on my subscriber server. ...
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240 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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1answer
40 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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2answers
297 views

SQL Server 2014 Failover cluster - Nodes on different patch levels

As part of trouble shooting a performance issue with a SQL Server cluster I found out that the nodes haven't been patched properly to the same level. It is a 2 node active / passive cluster. SQL ...
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2answers
74 views

Upgrade SQL Server 2014 AG to SQL Server 2017 AG

Is it possible to migrate SQL Server 2014 AG (Windows 2012, SQL Server 2014) to SQL Server 2017 AG (Windows 2016, SQL Server 2017) using rolling upgrade method? What I mean is Build 2 SQL Server ...
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1answer
166 views

when can AG primary replica be a different host to WFC primary?

To set up an Availability Group with two servers, the servers both participate in a Windows Failover Cluster. I've seen cases after certain failover modes where the primary IP address in the cluster (...
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176 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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2answers
398 views

Making a server with multiple instances a member of two effectively independent clusters

We're in the early stages of planning a new database environment for our ERP and CRM applications (third-party). The goal is to use Always On Availability Groups for HA, rolling patches, read-only ...

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