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8
votes
1answer
998 views

How Does Failover Clustering Work in Windows 2008 R2?

I am trying to learn how the failover clustering features works with Windows 2008 R2 as I am going to be using as part of SQL Server 2012 always on. I have been able to find information on how to set ...
7
votes
4answers
13k views

How to build a high availability Postfix system?

I'm needing to set up a remote mirror for a postfix server (where the content of both mail servers should be the same at any time). The idea is that if the main server comes down at some point the ...
6
votes
7answers
473 views

High availability virtual machines

I've been reading a lot about high availability virtualization, either via Hyper-V or VMWare. In that context, essentially high availability means that the VM is hosted by a cluster of physical ...
6
votes
6answers
14k views

Why are my HyperV VM's randomly losing connectivity?

I have a strange intermittent connectivity problem happening about once every two weeks. First my configuration: I am running a HyperV failover cluster with two physical hosts (node01 and node02). ...
6
votes
1answer
148 views

DHCP Server only remembering one lease

I have a Server 2008 R2 DHCP Failover Cluster that serves two VLANs - an office network and a guest WiFi network. Both of the members of the failover cluster are virtual machines (ESXi) and use the ...
5
votes
1answer
798 views

unable to destroy windows 2008 r2 failover cluster after SAN rebuild

I created a windows 2008 r2 failover cluster for a sql 2008 active/passive cluster. This two node cluster was using a SAN device for a quorum disk resource as well as MSDTC resource. Well....I ...
4
votes
1answer
173 views

DRBD for HA Server in Small Office Questions

Backround: We are in need of a HA server in a small office environment and are looking at DRBD to provide it. We only have about 100GB that needs to be on the HA server and server load will be ...
4
votes
4answers
9k views

Failover cluster failed to failover due to mysterious IP conflict?

I'm having a mysterious problem with my Failover cluster, Cluster name: PrintCluster01.domain.com Members: PrintServer01.domain.com andPrintServer02.domain.com in the Failover Cluster Management – ...
4
votes
3answers
2k views

Should the SAN (Dell MD3200) management port be on the same subnet/VLAN as the failover cluster private subnet/VLAN?

So, I'm getting a bit confused here. I have a Dell MD3200 SAN with dual controllers. Each controller has an Ethernet management port that connects to a switch. Together the two controllers connect to ...
4
votes
1answer
547 views

Hyper-V R2 can't add a teamed NIC as External Network

I have a Dell PowerEdge R710 running Windows Server 2008 R2 Datacenter and which was part of a Hyper-V Failover Cluster. It has 8x Broadcom BCM5709C NICs and three are teamed together to be my ...
4
votes
1answer
1k views

SQL Server 2008 R2 cluster, “available storage” shows “offline”

I've installed a SQL Server 2008 R2 cluster and I found the resource group "available storage" shows "offline" status. What does it mean? It seems I can't take it online. I tried to use the cluster ...
4
votes
1answer
493 views

Best practice in deploying SQL Server 2008 failover cluster over VMware ESX

I am now in the process of building SQL Server 2008 Enterprise failover cluster for use with 3rd party server monitoring application (which also do some OLAP analysis for trends). Since this project ...
3
votes
3answers
8k views

How do I know to which node of my Oracle RAC I am connected?

Is there an easy way to determine to which RAC node of an Oracle 11g R2 system I am connected? I am trying to perform some failover tests and I want to make sure my application is correctly connected ...
3
votes
2answers
568 views

Dealing with Stretch (Geo) Cluster Node Failures

Scenario: Three node (shared nothing) cluster on Windows Server 2012. Two nodes in the primary data center, both with votes (node weight = 1), and a file share witness. The third node is in a remote ...
3
votes
2answers
2k views

Failover Cluster : Microsoft Exchange Server 2010

The scenario is: I got 2 identical 2U rack mount servers with Operating System Windows Server 2008 R2 Enterprise. They are : in same domain. both installed Exchange 2010 in Hyper-V both are domain ...
3
votes
1answer
63 views

How can I verify whether a Windows cluster has previously been successfully validated?

As part of an automated SQL Server installation process, I'd like to programmatically check whether a Windows Failover Cluster has already been validated. There are some ways to validate the cluster ...
3
votes
1answer
696 views

Does dynamic quorum with Windows Server 2012 clusters make quorum configuration types irrelevant?

There are several quorum types: Node Majority,Node and Disk Majority,Node and File Share Majority,No Majority: Disk Only I did not modify any quorum settings when setting up a Server 2012 R2 cluster ...
3
votes
2answers
110 views

Differences between Private Cloud and Failover Clusters of VMs

Can someone please explain it to me what the difference between Hyper-V private cloud and Failover cluster of VMs in Hyper-V is. Thanks
3
votes
1answer
3k views

Active/Active vs Active/Passive cluster

First time setting up a clustered environment, and have a few questions. From a windows cluster perspective what determines if it is an Active/Active cluster vs an Active/Passive cluster? Is it the ...
3
votes
3answers
477 views

VLAN connections in Windows 2008 Failover Cluster

We are using Windows 2008 Failover Cluster for our iSCSI SAN system. There are two nodes which have 3 nics on each. Normally, these nics are working as heartbeat, LAN and iSCSI connection to SAN. The ...
3
votes
2answers
1k views

Set up DPM to use hardware VSS Provider with EMC Clariion SAN

We recently purchased an EMC Clariion AX4 SAN and we're using it to provide storage for our Hyper-V virtual machines. I've already got the servers registered with it and configured the failover ...
3
votes
1answer
588 views

GFS2 over DRBD automount

I have 2 nodes Proxmox cluster. For KVM images I use DRBD device with GFS2 on it. Everything works fine except GFS2 automounting after server restart. I put in fstab: /dev/drbd0 /cluster/drbd0 gfs2 ...
3
votes
2answers
1k views

Windows Cluster Fails after Power Outage

First, we have a Windows 2008 R2 Two Node cluster running HA Hyper-V and DHCP. We utilize a back-end Dell MD3000i iSCSI SAN for storage. All of the networking is done via redundant switches and MPIO ...
3
votes
1answer
3k views

Setting up an Active-Active IIS Cluster with ARR - is it possible?

I would like to know if we can setup an Active-Active IIS Cluster using Windows Cluster services that shares a common storage to store web content and WITHOUT the use of Windows NLB. I'm aware that ...
3
votes
1answer
382 views

Add MySQL as a resource to pacemaker

I am trying to enable fail over strategy using pacemaker on a mysql Master-Master replication on two virtual machine running openSUSE 12 created by VritualBox. I managed to complete the mysql ...
3
votes
2answers
3k views

How to properly shut down Windows Server 2008 R2 cluster?

We need to shut down MS Failover Cluster running on two nodes with MS Windows Server 2008 R2 Enterprise for hardware maintenance. I recently came across two possible approaches on how to shut down ...
3
votes
0answers
425 views

Windows Server 2012 - Hyper-V - iSCSI SAN - All Hyper-V Guests stops responding and extensive disk read/write

We have a problem with one of our deployments of Windows Server 2012 Hyper-V with a 2 node cluster connected to a iSCSI SAN. Our Problem Our problem is that for some reason all of the VMs stops ...
3
votes
1answer
745 views

cisco asa reloading

After having both memory and code upgrades, we have a significant number of our asa 5520's (in active/standby pairs) develop problems. The problem manifests itself as losing connectivity to the other ...
2
votes
5answers
967 views

linux clustered Filesystem

I currently have two CentOS Boxes providing NFS Services to multiple Web servers. Could someone recommand a file system which would mirror all files across both of these servers easily and ...
2
votes
1answer
139 views

What are the options for a HA system?

I'm looking into creating a HA Linux machine for my client's website. What are the main options I have, or a place/article where I can find out more? I would LOVE if it was a single-image, too, so ...
2
votes
4answers
404 views

Newbie questions on MAC and high availability failovers

I am reading about High Availability and I can not understand the following I read: On failover the primary IP migrates to the backup server BUT so must the MAC address. Specifically I read that ...
2
votes
4answers
450 views

SQL server failover clustering

How many failover clustered nodes can you have?, and if you add more and more nodes, is it going to slow down?
2
votes
2answers
349 views

VM guests in a private network spread across clustered hosts

I have a set of physical hosts with Windows Server 2008 R2 SP1 installed. Each physical host has the Hyper-V role installed and is configured to be part of a failover cluster (called cluster0). Here ...
2
votes
4answers
3k views

linux + create simple watch dog process in shell script

I need to create watch dog process (will run in linux version 5.x) that look all time on /etc/cluster.cf file And if the process matches the string: machineA_is_active in the cluster.cf file Then ...
2
votes
2answers
294 views

Can I use domain controller as one of my nodes in my cluster environment?

I want do some SQL Server failover cluster experiment on Windows 2008 R2 in VM. Now I created a domain controller(as DNS server too) DC. Also I created a server server1 and added into the domain. Can ...
2
votes
2answers
236 views

How to manage service failover?

I am using Windows Network Load Balancing to keep my apps available even when one of the servers is down. The problem is that it only detects when a whole machine is down. It happens sometimes that ...
2
votes
1answer
217 views

Should a SQL Server tempDB partition be shared by the cluster?

We have a 2-node SQL Server 2008 RS cluster. The data and log partitions are shared among the cluster nodes. Does the tempDB partition need to be shared as well, or will local server node storage ...
2
votes
2answers
438 views

Query another cluster group from SQL server?

Is there a way to query from SQL Server in TSQL which node is active in another cluster group in the same cluster? I have a cluster with two cluster groups, one with resources for SQL Server, one ...
2
votes
1answer
2k views

How to build true HA cluster using Ubuntu Cloud or other virtualization options

We need to set a fault tolerant solution for a VOIP application preferably using Linux clusters. The application will reside on server A and an identifically configured server B will act as fail ...
2
votes
2answers
126 views

When to employ server failover in a virtual environment

This question kind of got me thinking about fault tolerance in DHCP, so I did a little digging in my current environment and discovered that we only have 1 DHCP server per major site in our company ...
2
votes
1answer
6k views

System Account Logon Failures every 30 seconds

We have two Windows 2008 R2 SP1 servers running in a SQL failover cluster. On one of them we are getting the following events in the security log every 30 seconds. The parts that are blank are ...
2
votes
1answer
805 views

HyperV Cluster using IBM X3650 M3 and DS3400 SAN

I am posting here, because reading a lot of documents on MS site and technical forums have caused only more confusion. The equipment i have: 2 IBM X3650 M3 servers; both have 2 72GB SAS disks ...
2
votes
2answers
1k views

Performance of Cluster Shared Volume file copy from SAN

I am hoping someone can help me out with a strange issue. We are running a Microsoft Failover Cluster with Server 2008 R2 and an Equallogic PS4000 SAN. Our main configuration has 2 Dell Poweredge ...
2
votes
1answer
714 views

SQL Server 2012 Mirroring / AlwaysOn - need for SAN?

There appears to be a great deal of conflicting information about whether or not SAN is required for a Sql Server 2012 Mirroring setup. I currently have an Active-Passive-Witness SQL 2008R2 setup ...
2
votes
1answer
336 views

Windows Failover Cluster is registering as a domain controller

I have a few services that run as a Failover Cluster. At the moment, all the members of the cluster are domain controllers, but that may not always be the case in the future. The issue I have is that ...
2
votes
1answer
1k views

Failover Cluster Problem

We have a problem with our Hyper-v Failover Cluster.Failover Cluster gives me MSDTC error. I am receiving the following these errors. Cluster resource 'DTC' in clustered service or application ...
2
votes
2answers
335 views

Set up DNS to find closest IP [duplicate]

Possible Duplicate: Geo-DNS providers? I have one domain that may be accessed by people from all over the world. I would like to set up servers throughout the world and have people connect ...
2
votes
1answer
86 views

Get-Cluster cmdlet fails when using -Name param

Summary When I call Get-Cluster powershell returns the name of my cluster. For simplicity sake, lets call it Cluster1. If I call Get-Cluster -Name Cluster1 it fails with an error. Error: ...
2
votes
0answers
50 views

SQL Failover Cluster IP Migration

I have a four node cluster setup which I need to migrate from subnet A to subnet B. The cluster has roughly 12 instances running on it. I've found articles to update the SQL Cluster IP, but I've got ...
2
votes
0answers
262 views

TeamCity (or Jenkins) with Cluster/Replicated servers

We use Team City 7 for Continuous Intergration. Sometimes I need to bring down the server for maintenance which stirs up complaints. Is anyone using a cluster for these types of servers where there ...