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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“Skipping the default startup of database” SQL notification for AlwaysOn Cluster

So I set up our SQL servers to notify us of alerts at severity 17 or higher (as advised by various SQL Server articles). I've done this to each node of a SQL Server Always On Availability Cluster, ...
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+100

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 ...
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291 views

Single node SQL Server 2014 cluster at DR environment

We are setting up a new Disaster Recovery environment. On Production we have SQL Server cluster with two nodes. For DR we decided that one node should be enough. The plan is to add the second node ...
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450 views

SQL Server 2008 R2 Cluster Service pack 3 fail to failover node [duplicate]

I have a SQL Server R2 cluster on Windows 2008 R2 boxes, and today i was to install SP3. I installed it without any errors and rebooted the passive node. When i then try to failover to the passive ...
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221 views

SQL Server 2012 Cluster Service pack 3 fail to failover node

Roughly a year ago, i had this problem with an 2008R2 cluster. I asked about it here, but i didn't grab enough logs in the process. And now i have the same problem on my 2012 failover cluster. So i'm ...
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372 views

MariaDB Galera Cluster without HAProxy, MYSQL Proxy, etc

I'm looking to deploy a MariaDB galera cluster across three servers. However, I've noticed that the documentation often references HAProxy or the like. Does this not cause a single point of failure ...
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2k views

SQL Cluster Resources Disappear After Removing Disk Resource

In the process of removing an usused disk resource from cluster, I would follow these steps: 1) remove dependencies on the disks by the SQL Server resource, 2) take the disk resource offline, 3) ...
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284 views

delete WSFC 2012 cluster role/group fails

PS C:\Windows\system32> get-cluster Name ---- sql2012poc_cl1 PS C:\Windows\system32> get-clustergroup Name OwnerNode State ---...
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170 views

unable to connect to specific instance ORacle RAC

I did several operations by connecting successfully to all 4 instances but suddenly during one of the jobs, it failed with a TNS error. I checked the connect from SQL and one of the nodes is giving an ...
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How to allow connections to SQL Server with 2 differents ip

I have a small issue here: I have a SQL Server instance 2012 (let's call it SQLINSTANCE) on a cluster. I also have 2 network interfaces for this instance: - SQLINSTANCE.my.network - SQLINSTANCE.mgt....
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150 views

Cluster node upgrade of SQL Server 2008 R2 to SP3 fails when moving resource

I'm trying to update a cluster to SQL Server 2008 R2 SP3. I've installed SP3 on the passive node but when I failover the cluster it errors when running through it's upgrade scripts. The messages &...
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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 ...
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43 views

Understanding of SQL Server active/active cluster

I have a vague understanding of SQL Server's active/active cluster. Can anyone help to confirm if my understanding is correct? As I understand, active/active cluster use two or more Windows servers. ...
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22 views

Installing a Failover Cluster Instance on a Cluster already in use for Instances hosting Always On

I have been asked to install a SQL Server FCI on a 3 nodes cluster already hosting 4 different instances with Always On Availability Groups. While I am building the lab on my machine, I am wondering ...
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19 views

PostgreSQL Redhat Cluster Implementation(Active-Passive) With Streaming Replication setup For DR failover

We have a scenario Where Customer is looking For Cluster kind of solution with DR failover Setup. I am Planning to suggest the attached Architecture with customer. Few Clarification as per ...
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35 views

SQL Server 2014 Standard Max Memory vs. Cluster Shared Volume Cache

Deploying a new two node SQL Server 2014 FCI with Storage Spaces on a local (Cluster Shared Volume) CSV—JBOD will be attached directly to both SQL Server machines and the storage will not be tiered. ...
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32 views

Log shipping with active active cluster configuration

Scenario: We are planning to configure active active cluster for our SQL Server. Both will be having separate instances(A instance on node 1, B instance on node 2). 'A' instance will have Production ...
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44 views

Quorum Questions For An FCI And AlwaysOn in a WSFC

I was reading the white paper on FCI + AlwaysOn as well as several other resources on quorum voting differences in Windows Server 2008 and 2014 and had 3 questions. 1- Will giving a node in the ...
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30 views

Upgrading SQL Server 2008 failover cluster node to SQL Server 2012 failover cluster node [closed]

Please I want someone to help me with step by step method of upgrading SQL Server 2008 with failover cluster node on two different machines to SQL Server 2012 without losing the existing settings/...
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33 views

Fail to start sql cluster role

I have installed SQL Server using Failover Clustering on 2 nodes, running Windows Server 2012 R2 Enterprise Edition and SQL Server 2008R2 Standard SP1. Shared storage is provided by an iSCSI NAS ...
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2 Cluster managers Control same 2 nodes and control OLTP traffic?

can you have two cluster managers controlling the same 2 nodes so that you can achieve real time replication but still direct your oltp traffic to one node and your reports to the other node?
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59 views

Simultaneous money withdrawls from a distributed/replicated database

Lets say I have $10 in my bank account. The database is replicated in North America and Asia. At the exact same time I do a withdrawl of $10 in N. America and in Asia, meaning that my withdraw would ...
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53 views

SQL 2012 Availability Group issue - The core cluster resources do not move when we initiate AG fail-over

I have a Windows 2012R2 cluster with two nodes and a File Share quorum. I am running SQL 2012 SP2 and I have configured a test AG with a dummy database. When I fail-over the AG, the Availability ...
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28 views

Hardware Cluster to VMware, is vMotion an alternative for clustering?

We are migrating DB servers from "real" clusters to VMware. The question is with VMware how do you get similar functionality in VMware? Things like failover etc? Is vMotion the answer? I wonder what ...
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58 views

MongoDB cluster deployment

I am new to MongoDB. I am trying to deploy a MongoDB cluster. I am following: https://docs.mongodb.org/manual/tutorial/deploy-shard-cluster/ I initiated Config Server Replica Set and after that I ...
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851 views

Experience using ScaleArc in test or production?

Has anyone had any experience using ScaleArc? My CTO has asked my thoughts on it, and I have seen no information out there regarding real-world experiences.
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22 views

DR site SQL Server DB server not need Quorum Disk?

We have two SQL Server DB Servers and Shared disk in production site and 1 DB in DR Site. Production site has Quorum Disk on Shared Storage. Production site DB servers can access this share storage, ...
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SQL Server 2014 - Add Node inherits wrong configuration

I'm setting up a simple 2-node failover cluster with SQL 2014 on Server 2012 R2 in Core mode (no GUI). I have the cluster configured with identical machines, and I have the first node configured and ...
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32 views

Changing database parameters after removing a node from RAC oracle

Oracle 11.2.0.3 on SunOS 5.1 i have a client who is running a 2 node RAC environment but has shutdown the instance on one of the nodes. I was wondering whether after doing this they should change the ...
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49 views

Apply SQLServer Service Pack to a Single Node Cluster

I have to apply a SQL Server 2008 R2 Service Pack to a Single Node Cluster. The other node died and new hardware has been ordered. Is there anything weird to worry about? Normally we'd apply the ...
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2 SQL Clusters & 2 instances

Can anyone tell me why i wouldn't want to the architect Option 1 for SQL Server clustering? Option 1 is having 2 different clusters, and 2 different named instances on 2 VMs. One's Active is the ...
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1answer
48 views

Add New Cluster node

I have a Windows Server 2012 Failover Clustering Instance, hosting a SQL Server 2012 Enterprise Cluster, via NODE1 and NODE2. I need to add a new read-only Replica to this cluster: NODE3, which is a ...
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23 views

Should a Sql Server be accessible through the service's virtual network name?

In a working SQL-Server failover cluster environment I can open a SQL-Server connection using the configured service's IP address independantly of the current node it is on. I wonder if the assigned ...
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91 views

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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47 views

Sql Server Cluster with multiple nodes

Does it make sense to think about a failover cluster configuration where less than 50% of all included nodes are standby? For example instead of setting up 4 clusters with two nodes each where one is ...
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132 views

Connect to Oracle RAC from SQL Developer?

We have set up RAC database on server. We can connect to database from sqlplus on the server using SCAN address. However, if I try to connect to RAC using SQL developer from client machine using SCAN ...
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36 views

WSFC File Share Witness

I've got a multi-site 2008 R2 WSFC with a file share witness. I noticed that the possible owners for the FSW is every node in the cluster. I thought the concept of a FSW was that no node of the ...
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Users in SQL Server cluster

Question on users: I have created a 2012 WFC and SQL Server 2014 is clustered on it. The cluster works as expected but have a question on Users. I added a windows domain group to the cluster as ...
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2k views

SQL Server Licensing & Clustering for Always On

For SQL Server 2014, reading this MSDN link and Microsoft PDF file about licensing, created a couple of questions. For Always On do we need WSFC or FCI? How are WSFC and FCI different? If we only ...
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173 views

The right way of starting up a Galera Cluster

I am confused about the bootstrap process of MariaDB Galera Cluster. Let's say we have 3 nodes of a MariaDB Galera Cluster, working and functioning normally on CentOS6/7. However, at some point we ...
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56 views

Windows cluster failed over, but SQL instances didn't move

I recently inherited a SQL Cluster (2008R2) which for the most part behaves itself impeccably. The windows cluster is made up of two nodes running Active/Passive, Node1 and Node2 are dedicated ...
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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 ...
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381 views

grastate.dat with seqno -1 on a healthy cluster. Why?

We use those versions: # rpm -qa | egrep '(galera|maria)' mariadb-libs-5.5.41-2.el7_0.x86_64 mariadb-galera-common-5.5.40-6.el7ost.x86_64 mariadb-galera-server-5.5.40-6.el7ost.x86_64 mariadb-5.5.41-2....
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1answer
18 views

Installing a SQL Server patch on a node within a 2-Node FCI

When installing a SQL patch on a 2-Node Automatic FCI with a shared disk (in the same datacenter / same subnet), with quorum achieved by Node and FileShare Majority, is it possible to install a SQL ...
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2answers
47 views

Is MySQL Cluster just for in-memory databases?

In MySQL website I see below definition for MySQL Cluster. MySQL Cluster is a technology that enables clustering of in-memory databases in a shared-nothing system. I want to use Clustering for ...
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1answer
41 views

Do SQL Sharding or Cluster help speed up slow queries, or just concurency?

I am having a performance problem with my current single instance database as the volumes of data grow. The application I am working on receives inserts once a month, and the oldest month is deleted ...
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60 views

How to do rolling upgrade MariaDB 10.0 -> 10.1 on ubuntu 14

I'm trying to figure out how to do a rolling upgrade of our galera cluster running on MariaDB on Ubuntu 14.04. In testing, the first node I upgraded started complaining about the timestamp column in ...
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1answer
2k views

Event 4104, MSDTC Client 2

I am using Idera SQL Diagnostic Manager to monitor a Windows Server Failover Cluster with two SQL Server 2008 R2 clusters configured to run with one SQL Server cluster on each node. It just started ...
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35 views

SQL Server clustering issue

I am facing a serious issue while building a clustered fail-over instance. After installing clustered instance on both of the nodes, SQL Server is running on only one node (the first node) and as soon ...
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65 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....