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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.

129 questions with no upvoted or accepted answers
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votes
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596 views

Alwayson AG lease timeout and healthcheck timeout

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 ...
5
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1answer
583 views

How to Achieve Concurrent Write Transactions to MySQL Group Replication in Multi-Primary Mode

I've set up a MySQL "cluster" (four CentOS 7 servers running MySQL 5.7.19) using Group Replication in multi-primary mode, but I can't get it to accept writes from more than one thread at a time. This ...
4
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309 views

Should Full Text Filter Daemon Service be a cluster resource?

Our newly installed and configures Sql Server Always On Availability Failover Cluster with Sql 2016 Enterprise Edition with four instances and six nodes. It includes the DB Engine Service and the ...
4
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0answers
356 views

Cluster migration to new hardware, same OS, but SQL Server 2012 to 2016

I have a 3 node cluster running on Windows Server 2012 R2. Two nodes for the databases, the 3rd node is an Always On db used for reporting. I have new hardware built running the same OS, but will need ...
4
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1answer
439 views

How (if at all) does Galera enforce authentication for SST via rsync when adding a node?

I have to be missing something here. It just hit me as added a new node to my cluster in order to prepare for the removal of a different node: "How does the cluster know that it is okay to send the ...
4
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0answers
3k 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,...
3
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0answers
35 views

Availability group/Failover cluster failing without signs of errors

So this is the second time it happens. Specs: SQL Server 2014 Enterprise Failover Cluster with 2 nodes No Quorum ( I Think ) Event Viwer has some events as follow: The information one always ...
3
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0answers
308 views

Error: “Computer X is Joined to a cluster” when creating a new cluster

I am trying to create a New Cluster for Always On Availability Groups. On Failover Cluster Manager when I try to add the cluster nodes I get the following error: Computer X is joined to a cluster. ...
3
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0answers
153 views

Securing a Cassandra Cluster

We've managed to set up a Cassandra 2.2.6 cluster of two physical nodes (nodetool sees both of them, so I'm quite certain the cluster is indeed active). My steps to create the cluster were (this ...
3
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0answers
265 views

Is it good practice to have multiple keyspaces in Cassandra?

I've Cassandra configured on Amazon EC2 having 3 nodes(instances) in single cluster. Now what I want to do is give some space on Cassandra to my clients by creating separate keyspace for each in a ...
3
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0answers
531 views

Move SQL Server cluster from one location to other

I am looking for ideas on how to move SQL Server 2012(standard) two node cluster installed on Windows server 2012 standard to other location which is far away from current location. The two locations ...
3
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0answers
333 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
443 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. ...
2
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0answers
106 views

SQL Server 2016 SP2 CU9 - WFC Failover failing

I have updated my SQL Server 2016 on one of my Windows Failover Cluster nodes successfully. When I attempted to failover one of my SQL instances onto the newly patched node, SQL Server service fails ...
2
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0answers
92 views

Percona Xtradb Cluster not accepting options on command line

I am using Percona Xtradb Cluster 5.6 and trying to start my cluster through a donor node via command line and I am getting this error: CentOS 7: systemctl start mysql --wsrep-sst-donor=srv1 ...
2
votes
1answer
74 views

Snapshot Folder Location for Replication with Clustered Instance

I am assigned to create a transactional replication with a SQL Server clustered instance for reporting purposes. I'm planning to use the Distributor and the Subscriber on the same box. Regarding the ...
2
votes
1answer
418 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 ...
2
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0answers
197 views

SQL Server 2017 Failover Cluster on RHEL Linux

I am trying to create Failover Cluster on SQL Server 2017 on RHEL 7.3 Linux, following this document from Microsoft: https://docs.microsoft.com/en-us/sql/linux/sql-server-linux-shared-disk-cluster-...
2
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0answers
3k views

Cassandra - High Number of Dropped Mutations (Specific Table on a specific Node in the cluster)

History Leading to this issue: My Compression strategy in Production was LZ4 Compression. But I modified it to Deflate For compression change, we had to use nodetool Upgradesstables to forcefully ...
2
votes
1answer
3k views

Lease Timeout VS HealthCheck Timeout - AlwaysON

After all the reading this is what I understood. Is it correct? LeaseTimeout is a simple heartbeat between SQL Server resource DLL and the SQL Server instance. HealthCheck Timeout is related to ...
2
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0answers
503 views

Cluster using docker

We are creating a new application using microservices, and for that we would like to be able to raise database instances just like we raise new instances for the application's microservices. We do not ...
2
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0answers
341 views

Startup Parameters missing on passive SQL Server node in cluster?

I built a failover cluster on windows 2016 for sql 2016 using SMB fileshare as shared storage. This is just for learning, not production (I'm a SharePoint guy btw) On the passive node, once installed,...
2
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0answers
1k views

Mongos process memory usage and crashes

So our MongoS instances use up A LOT of memory. More than even the shards and sometimes crash because of it. Cluster structure 3x mongos 3x mongod Shards 3x mongod Replicas (one for each shard) 3x ...
2
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0answers
468 views

DBCC failure due to sparse files on Windows Cluster

We have a SQL Server 2014 SP1 cluster on Windows Server 2012 R2, and came across a problem with DBCC jobs failing and issuing the following messages: Msg 1823, Level 16, State 2, Line 3 A ...
2
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0answers
561 views

Read replica setting giving error “No candidate servers found”

I am running my website with Laravel 5 + MongoDB. I am using mongo cluster to speed up data read and write, and to lower CPU usage of the mongo server. I have set up the replica like this: 10.0.1....
2
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0answers
69 views

Upgrade cluster sql server 2014

How can I upgrade SQL Server cluster 2012 to SQL Server 2014? Version – Standard. We have 2 nodes and 2 instances on each node. Have you manuals for upgrade 2 instances on cluster SQL Server 2014 We ...
2
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0answers
36 views

Cluster of Clusters (Not using MySQL-Cluster)

I'll start with an apology, I'm an Ops guy at heart, not a DBA, so I may use the wrong terminology, not in an effort to annoy, merely because I don't know any better. OK, that over with, on to the ...
2
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0answers
105 views

PostgreSQL on Cluster

question - I'm working on a project that involves heavy computation and will continually grow in terms of the database it works with. I want to build a small cluster (NUCs I'm thinking) the run a ...
2
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0answers
924 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 ...
2
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0answers
349 views

SQL Server Always On Failover Cluster Design

I have two databases. One I'd like to set up in an availability group between two servers (two instances, one on each server). The database is not huge and I'm not expecting it to grow exponentially....
2
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0answers
42 views

Alwayson cannot fail over using tsql

I have an Alwayson test environment with the following settings. My test goals are as follows: When SqlNod1 is primary instance, I want SqlNod2 to answer read-only queries. When SqlNod2 is primary ...
2
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0answers
826 views

Multi-Instance Windows Failover Cluster - Min / Max Memory Allocation Dilemma

We run numerous 2 node SQL Server 2008 R2 Failover Clusters in Windows Server 2008 R2 on a VMWare eSXi virtual platform. Each cluster hosts 3-4 SQL instances with varying degrees of memory ...
2
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0answers
8k views

what is the right way to restart a mariadb galera cluster?

I am trying to restart cluster. I have two problems in stopping cluster and starting cluster In stopping cluster, I follow the instruction https://software.mirantis.com/reference-documentation-on-...
2
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0answers
5k views

High availability PostgreSQL 9.3 server on Windows

I'm trying to set up PostgreSQL 9.3 server in HA mode on 2 Windows servers. Final solution should be deployed to Microsoft azure network, so there are few limitations. Since Microsoft is doing ...
2
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0answers
736 views

How to use Blob Storage as shared storage in a Windows Azure Failover Cluster?

In the context of SQL Server 2012 Standard Edition, is it possible to make Azure Blob storage available to a SQL Failover cluster directly as a shared SCSI resource on a Windows Cluster composed on VM'...
2
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0answers
270 views

Error in alter table reorganize partition for MySQL Cluster

My cluster contains 48 million rows and cluster contains 4 storage nodes . After that I add online storage node and executed alter table 'customer_tbl' reorganize partition. Some parameters of config....
2
votes
1answer
961 views

MongoDB cluster setup

I am trying to set up a 3 node MongoDB cluster. 1) Started mongodb in all 3 nodes with the below config file. net: bindIp: 0.0.0.0 port: 10901 setParameter: ...
1
vote
0answers
24 views

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 ...
1
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0answers
211 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 ...
1
vote
0answers
862 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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0answers
33 views

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 ...
1
vote
1answer
1k views

MongoDB replica has no primary

I have an existing MongoDB setup (part of a Graylog installation) where I'm attempting to configure a replica set with a primary, secondary and arbiter. I had the primary and arbiter configured ...
1
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0answers
33 views

Java app crash after shard failover

I am using a Mongo sharded cluster with 4 shards. All shards are a 3 members replica set with a PRIMARY with priority 1, a SECONDARY with priority 0.5 and an arbiter. The Mongo config server is a 3 ...
1
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0answers
101 views

Cassandra pool warning displaying continuously

I am using the Cassandra driver for python in Spyder. I am trying to fetch some data from Cassandra table. Here is my code: from cassandra.cluster import Cluster cluster=Cluster(['some_ip']) session=...
1
vote
1answer
29 views

Mysql cluster configuration help

I am new to mysql cluster I was reading around the web how to set it up. I came up with 2 different set up not sure which one is better fail safe vs cost efficient. Our new site have clients in USA ...
1
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0answers
137 views

Domain Independent Cluster on AWS

I am trying to work out whether it's possible to create a Domain Independent Workgroup Cluster in AWS (on Windows Server 2016 for use with SQL 2017 Availability Groups). This environment also has no ...
1
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0answers
559 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 ...
1
vote
1answer
33 views

Can I add 1 primary node in existing cluster?

I have a 2 node windows 2012 cluster and SQL Server 2012 installed on both. In this I have added a database on nodeA as primary and one on nodeB as secondary. I want to add more 2 databases which will ...
1
vote
0answers
456 views

clussvc.exe consuming high cpu

We have a 4 node cluster running 2 SQL Failover Instances. Windows 2012 Standard & SQL 2014 Microsoft Failover Cluster Service has been consitently between 25 - 30 % CPU. This is happening on 2 ...
1
vote
1answer
342 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 ...