A computer cluster consists of a set of loosely connected computers that work together so that in many respects they can be viewed as a single system.

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Server Clustering (Django, Apache, Nginx, Postgres)

I have a project deployed with django, Apache, Nginx and Postgres. The project has requirement of live data viewable to customers. The projects main points are: 1. Devices in field send data to ...
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3answers
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HYPER-V R2 Can not mount ISO from network location (UNC Path)

So, as the name suggest I'm trying to mount a ISO from a network share using the UNC path to a HYPER-V R2 Cluster. This is a pure Demo / test case setup with: 2x HYPER-V R2 1X NAS/iSCSI CSV Cluster ...
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3answers
842 views

Windows SQL Server Cluster Failover Without Disruption

Is MS SQL server clustering capable of performing a seamless fail over between nodes? That is, where the clients wouldn't notice anything had changed except perhaps a short delay during the ...
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2answers
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Combining failover clustering and database mirroring

When you combine failover clustering and database mirroring in SQL Server, you need to change the mirroring partner timeout value so that the local cluster gets a chance to fail over before database ...
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1answer
198 views

zpool disappears whenever solaris cluster reboot or power cycle

I have following setup Oracle Solaris 10 -> 5.10 Generic_147147-26 sun4v sparc Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit production Oracle Solaris Cluster 3.3u2 for Solaris ...
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1answer
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Load balancing glassfish v4.0 CLUSTER with apache HTTP server: Location of apache

I am teaching myself to build clustered Java EE 7 applications. I am focused on Glassfish Server v4.0. Based on the official documentation (Chapter 7 page 133) , Glassfish can be loadbalanced using ...
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2answers
6k 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 ...
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1answer
259 views

What is the differences between a Remote File Share Witness Quorum and a Disk Witness Quorum?

Say you set up a Windows Server Failover Cluster consisting of two nodes, on Windows Server 2008 R2 Enterprise. Now when you want to configure quorum you can use either a remote shared folder, or a ...
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1answer
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How do I network this Windows Failover Cluster and MongoDB Replica Set? (diagram inside)

As you can see, my two Windows Server Failover Cluster (WSFC) nodes have three network interfaces each, which connects them to three different networks : A public network A private network ...
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1answer
353 views

What is and what is not replicated in a glassfish cluster with a mod_jk load balancer?

I have a Glassfish (3.1.2) cluster over 2 computers as nodes, with a mod_jk load balancer. Are servlet instance variables replicated perfectly? If not, how do I make sure it is? Are all actions, ...
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1answer
371 views

How to change the Service Console subnet on an ESX cluster?

We have an existing VMware ESX 3.5 cluster (6 hosts, VI 2.5) and need to move the service consoles to a new subnet. We would like to do this without downtime for the VMs. In my previous experiments ...
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2answers
664 views

Are there high availability cluster solutions for real-time TCP streaming?

We have a server that receives some data, acting as a TCP client, processes it in some way, and serving processed data to clients, acting as a TCP server. It also stores this data on disk and can ...
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212 views

Sun Grid Engine Array Job Individual Resources

Is it possible in Sun Grid Engine to have array jobs where each subtask has a unique requirement? For example I may have an array job for which each task has a small unique requirement but I do not ...
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2answers
3k views

SQL 2008 R2 Clustering options

I am looking to setup SQL 2008 R2 clustering on Windows Server 2008 R2. Can someone give me some options available for installing SQL Server clustering or best practices? I thought SQL had ...
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6answers
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SQL Clustering on Hyper V - is a cluster within a cluster a benefit

This is a re-hash of a question I asked a while back - after a consultant has come in firing ideas in to other teams in the department the whole issue has been raised again hence I'm looking for more ...
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1answer
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Pitfalls to using Gluster as a home/profile directory server?

I was asking recently about options for divvying up access to file servers, as we have a NAS solution that gets fairly bogged down when our users (with giant profiles, especially) all log in nearly ...
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2answers
6k views

Cannot add second host to a Network Load Balance cluster

I am using Network Load Balancing on Windows server 2008. (Servers have two NIC's and the cluster is configured to run in unicast mode) I can configure the cluster on either of the hosts and add the ...
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RabbitMQ two node high availability cluster intermittently breaks with Veeam backup jobs

The environment consists of two 2012R2 Virtual Machines running RabbitMQ in high availability (ha-all) on their Queues. I use Veeam to create snapshot backups that are sent offsite as part of the DR ...
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558 views

Pacemaker ocf:heartbeat:IPaddr on different subnets

I'm trying to add a Pacemaker virtual IP address; with it, the gateway, and the two VMs it serves on different subnets. I've only done this before with all IPs on the same subnet, and I need some ...
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1answer
403 views

What is the proper way to shutdown an iSCSI target with connected clients?

iSCSI with two DRBD primary nodes is a bad idea to use if the two paths get concurrent write requests. But I am thinking about using this idea as backend storage for an ESXi 5.5U2 host. I already did ...
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1answer
3k views

clvmd problems during the RHEV cluster deployment

We are deploying Red Hat Enterprise Virtualization cluster and we faced a problem attempting to start clvmd service after the lvm partition creating. The following has been completed successfully: ...
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3answers
276 views

Choice of distributed filesystem for intensive reads and writes

I have a series of servers (HP ProLiant, 34 servers) each of which with 500 G of hard drive space. These servers are part of a computational cluster which runs processes that roughly fall into two ...
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1answer
131 views

Riak cluster backup 10 nodes to 6 nodes

I'm wondering how we can backup a cluster of 10 nodes and restore on a cluster of 6 nodes. No matter the technique used for the backup (fsync, riakmanager, ...). Any help you can give would be ...
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2answers
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How to set up Zabbix to monitor SQL Server Failover Active-Passive Cluster?

It should be simple, so it is just most likely my approach being totally off and someone will hopefully prod me into the right direction. We have a Zabbix 2.0.3 server instance set up monitoring a ...
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1answer
2k views

Hyper-V virtual machine can't be migrated to a specific host in the cluster

I have a three-node Hyper-V cluster running on Windows Server 2008 R2 which is working quite flawlessly: there are no errors, live migration works, all hosts can and will happily run all virtual ...
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1answer
671 views

Prevent iSCSI connection from being terminated early on reboot

I have a clustered Hyper-V environment with four nodes and three PowerVault MD3xxx storage arrays for shared storage. The servers are using standard Ethernet connections for the iSCSI fabric (not ...
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1answer
279 views

Are there any serverless distributed filesystems?

Similar to Is there a Distributed SAN/Storage System out there? or Distributed redundant storage solution?, except with a couple key differences (and two years newer). Context: I have a small Rocks ...
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1answer
237 views

Using PCIe as an Interconnect Connection [closed]

I was researching about connecting multiple server nodes together to share resources. I came up to this page: http://www.plxtech.com/applications/cloud From what I read, I see this is possible. ...
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1answer
971 views

Looking for advice on Hyper-v storage replication [closed]

I am designing a 2-host Hyper-V R2 cluster with 6-10 guests stored on a SMB iSCSI SAN device (probably Promise VessRAID). I will be getting at least two of the SAN devices and need to eliminate the ...
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3answers
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SQL Server Cluster Performance

Can anybody help me answer what I hope is a really simple question? Assume I have an application running against a SQL Server database, and I am running performance tests. Should I expect improved ...
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5answers
2k 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 ...
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1answer
260 views

Why Failover instead of Load Balancing for HA

From my understanding with failover clustering, only one machine is actually working, which means the other one(s) are sitting idle. So why would one use failover clustering instead of using a load ...
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5answers
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How to build a single virtual machine on top of multiple computers? [duplicate]

Is there a way to run Linux operating system on a virtual machine which aggregates the resources of physical machines on the local network and acts as a single super-computer? If possible, how? ...
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3answers
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Does Windows Server 2008 R2 standard edition support cluster?

I want to install sql server 2008 r2 edition in a cluster environment. Can I use Windows Server 2008 R2 Standard edition? Thanks.
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2answers
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Windows 2008 R2 File Server Cluster vs. DFS

We're currently using 2 Windows 2008 R2 with DFS but discovered some issues with: replication of permissions (permissions are not replicated across DFS members) replication of quota (quota is ...
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2answers
146 views

Is Server Clustering Right for a 25 Person Business?

Company owner wants high availability as even a 1 hour downtime kills billable revenue for 20 accountants. I've got a one year old Dell PE T110-II running 2012 Standard and an ancient PE 840 running ...
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5answers
386 views

HA Cluster having tower 4U server with SAS

I'm a little bit confused in here.. I want to have 2 node cluster with shared storage. I read all wiki page about HA cluster. Now in my head there's a scheme like: So we have two 4U tower servers ...
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4answers
400 views

Hosting Very High bandwidth sites

I have been tasked with scoping out infrastructure requirements for a site that will be pulling over 10 million plus unique visitors per month. This site will be several gigs in size content wise. I ...
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3answers
273 views

I'm thinking n+1 in a hyper-v r2 cluster managed by scvmm is not a great idea anymore

Around here the clusters (not hyper-v clusters) are typically configured as n+1, so they are asking me to create a n+1 hyper-v r2 clusters. These will configured with both csv's and live migration and ...
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2answers
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Can I use ext3 as a shared fs if I add a lock manager?

I need a cluster filesystem for an iSCSI device. The problem is that the servers to which it is connected generate datafiles which must be read by every other servers. Except for the writing and ...
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2answers
419 views

Mount two nfs's shares from different storage over the same directory on linux

I have a set of 4 Linux web servers on cluster all of them have the same mount point: /folder This /folder is a NFS mount share over a NAS but is full and no more luns/disk are available to expand ...
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1answer
860 views

Why do Layer 7 load balancers configuration not require any client configuration changes?

For example, for haproxy (layer 7) load balancing, you only need to configure the "real servers" or "backends" behind the VIP (i.e., cluster IP). E.g.: listen smtp 192.168.3.10:25 mode tcp ...
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2answers
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Windows Server 2012: Possible to have High Availability and reliability without needing a SAN, but connecting servers together?

I have some questions below -- tried to word them the best I could. If you downvote my post, please make a comment explaining why you downvoted so that I can try to do better when I post in the ...
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3answers
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How cluster server works?

Now, I have a server running php + Mysql, but my server loading is very high, I want to start up one more server to reduce the workload, what should I do? Thank you.
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2answers
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Clustering Microsoft versus Linux

Does anybody have experience with both Linux and Windows failover redundancy clusters, and if so which do you prefer for file server and/or web server? For a little background. We set up and ...
2
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1answer
178 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 ...
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1answer
515 views

Best method to share ISCSI lun across cluster of app servers

I'm in the process of migrating our cluster to new hardware. We use bare metal servers, no virtualization. Currently, we have around 30 "application" servers. When we make an update, we push the ...
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1answer
909 views

Microsoft fail over cluster and storage with raid card

I am looking for some input on a Microsoft fail over cluster implementation on 2012. To use the storage and pools it apparently has to have JBODS if your using a raid card. But the LSI card we use ...
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4answers
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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 ...
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3answers
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How use DNS server to create simple HA (High availability) of my website?

Welcome, How can i use DNS server to create simple HA (High availability) of website ? For example if my web-server ( for better understanding i use internal IP in real it will be other hosting ...