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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Windows Server 2008 Cluster Errors

We have a couple dozen Win2008 and 2008R2 Enterprise clusters that are used for SQL Server 2008 and 2008 R2 Enterprise/Datacenter. In the past we have had many issues with random failovers and ...
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3answers
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Clustering IIS and SQL Server

I have a WCF service deployed on IIS and using SQL Server 2008 as backend. My Question is how can I make cluster(load-balance/fail-over) on IIS and on SQL Server and what sort of thing i need to ...
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1answer
158 views

What are good options to cluster file servers?

We have a NAS with relatively slow disks that is choking when users are logging in in the morning. We're migrating user home directories and profiles to a newer, faster server, but I was wondering if ...
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3answers
287 views

Experience with CVS on a clustered filesystem

I would be interested in any experiences using CVS on a clustered file system with mulitple servers accessing it. I guess this is similar to what providers like SourceForge do. Currently we use a ...
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0answers
550 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 ...
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Pacemaker/corosync timeout before resource transfers

This seems like a simple question, but one I can't seem to find the answer for despite going over the pacemaker documentation multiple times. I've got corosync set up with pacemaker to share a ...
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6answers
632 views

Running background jobs In a clustered environment

I have an architecture question. In a clustered web app environment, I can think of three ways to deal with background jobs: have a dedicated machine run all the jobs, thus freeing the web servers ...
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2answers
245 views

MySQL Clustering and replication

I want to setup a MySQL cluster setup of two servers (M1-M2). I also want to setup MySQL replication between two servers (M1-M3). Is it possible to setup both clustering and replication as above. Is ...
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2answers
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Novell Clustering Problem

I am trying to cluster 3 servers to then mount an NSS. I have all 3 configured and ready to roll. The only problem is none of them are apart of any cluster. When I run the: "cluster join" command I ...
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11answers
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Most resilient form of (private) DNS clustering?

I'm working on a setup with two datacenters linked by a MAN (bridged) and everything is doubled between them, in fail-over mode with RedHat Cluster, DRBD and that kinf of things. I have one DNS ...
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3answers
333 views

Choosing between Debian and Ubuntu

Debian or Ubuntu for online multiplayer game cluster? (latest versions both) I plan to run: Erlang apps (ejabberd + modules) with many-many connection Java apps for business logic Memcached with ...
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4answers
10k views

HAProxy cannot bind socket for proxy on a remote machine

I'm using HAProxy to load balance the incoming requests on my two tomcat backend servers. In the config file when I specify HAProxy to listen to the same machine on which the HAProxy is installed, ...
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What are the pros and cons of OCFS2 and GFS2 filesystems versus NFS?

We need to set up a SAN accessible from a bunch of computers, both virtualized and real. We have an iSCSI SAN and I need to ponder some of the options. What are the differences between GFS2 and ...
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3answers
1k views

Sharing SSL Certificates in a Cluster

Hopefully a very simple question, if I wanted several servers providing the same service to hold a certificate (e.g interface.internal.org) would the procedure be; Generate Public/Private Pair on ...
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3answers
17k views

How can I fix a bad arp entry?

I'm just guessing that arp is my problem... I have a linux drbd server cluster set up, and due to some power issues had to unplug the switch that connects the two servers. As a result, both servers ...
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5answers
3k views

How to make AD highly available for applications that use it as an LDAP service

Our situation We currently have many web applications that use LDAP for authentication. For this, we point the web application to one of our AD domain controllers using the LDAPS port (636). When we ...
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3answers
4k views

Minimum hardware requirements of a loadbalancer?

I'm going to use a FreeBSD system as a loadbalancer which routes 1gbps public traffic to back-end webserver cluster. What are the minimum hardware specs for this job? Thanks.
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3answers
61 views

HyperV Failover Cluster (with/without CSV)

Been browsing a few websites, and it seems right now all hyper-v clusters are build on CSV ( clustered share volume ). I have a current setup (2 node window failover cluster). I have 2 vms running ...
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2answers
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To SSD or not to SSD? (Virtualization - Xenserver) [closed]

I have several Xenserver boxes running (very well). Most of ours are setup with a RAID1 with two mechanical 7200rpm enterprise sata drives, or RAID10 with 4 7200 enterprise sata drives. The sata ...
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5answers
6k views

Disable fencing in RedHat Cluster?

Whilst I'm developing with RedHat Cluster, I'd like to be able to disable fencing completely. The documentation for this stuff is fairly lacking - can I do this at all, or should I be looking to fake ...
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2answers
84 views

Hyper-v failover or replication in 2 node cluster

I'm trying to setup some form of a failover cluster between 2 hosts. I want to be able to have high availability on 2 of my VMs. It seems that some form of shared storage is required for this to work ...
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1answer
4k views

HA mail server configuration

I have a mail domain and two servers (machines) with Centos 6.4 and public IP addresses. Postfix mail server and Dovecot IMAP/POP3 Server are installed on both. How would I set them up redundantly so ...
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1answer
247 views

Active directory (AD) best-practice for clustering

We want to use AD as a regular LDAP for storing and accessing our application data in fast and reliable way. We have two physical server and want to organize some sort of clustering for AD and its ...
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2answers
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High Availability with 2 servers?

Is it possible to have a high availability setup with 2 servers? Running Windows Web Server 2008 and MSSQL Web Edition (as I know Express isn't supported)? Getting to the point where our one ...
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4answers
1k views

SQL Cluster on Hyper V Failover Cluster

We have a VM running SQL Server on a 6 node cluster of blades. The VM's data files are stored a SAN attached using a direct iSCSI connection. As this SQL server will be running a number of important ...
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7answers
203 views

Software for Utilizing Idle Workstations on Network

I work at a company that maintains a network of about 200 Windows XP workstations, and several of them are on (locked or logged out) with an idle processor and 2GB of RAM that is just sitting there. ...
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5answers
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Web interface for torque

Can someone recommend a good web interface for Torque? I'm interested mostly in monitoring the status of the job queues.
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1answer
582 views

Multiple Postgres Servers (one writer, multiple reader) with Shared Disk

Here's the scenario: One shard disk (Gluster) Multiple Postgres servers Requirements: Use the shared disk to store the database files Use a configuration which provide maximum efficiency ...
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1answer
874 views

Shared Block Device File System (iSCSI)

I wanted some advice on a file system to use on across 5-10 servers that have a shared block device (iSCSI), GlusterFS and LusterFS seem to be it, but they dont say anything about shared block device ...
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2answers
92 views

Are there cluster resource schedulers abstraction layers?

I'm writing an application that could potentially be run on any cluster resource scheduler (SGE, LSF or SLURM to name a few of them), using very basic functionalities. I'm wondering if a ...
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1answer
22k views

Display or install Windows product key on command line

We are currently in the process of setting up several Windows HPC clusters using Windows 2008 HPC R2. We would like to be able to perform Windows licensing commands across the clusters via the ...
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2answers
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Hardware Requirements of SQL Server Clustering

My task is to do clustering in SQL Server 2008. What are the hardware requirements for windows clustering? Is either SCSI or SAN compulsory, or is shared disk enough? I can't understand the hardware ...
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4answers
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one fast VM on many slow hosts?

Is there any VM host software that supports a host-cluster, where it sums all (physical) RAMs to one big (virtual) RAM, and maps the many host-CPUs (in many PCs) to some (virtual) multi-core setup? ...
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3answers
666 views

Clustering/load balancing for cluster unaware applications

Forgive me if I use any of these terms incorrectly. I am wondering if there is any kind of software that would allow my two "join" two computers together such that a cluster unaware application could ...
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2answers
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2012 Cluster service name failing

I have successfully created a cluster, but any services I try to cluster fail with the same or similar symptoms (I have tried clustering DTC and installing a SQL cluster). Environment: 2 – nodes – ...
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3answers
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mod_jk produces Error smh errno=13

I am trying to use mod_jk for load balancing. Loadbalancer: 172.17.8.189 (HTTPD+mod_jk) Node1: 172.17.8.193 (apache tomcat instance 1) Node2: 172.17.8.196 (apache tomcat instance 2) I checked my ...
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2answers
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How to make a DHCP server on virtual machine serves other virtual machines(on different physical machines)?

I'm building a virtual cluster with VirtualBox and Opensuse. I have 10 physical machines and need several vms on each. The virtual machines are supposed to be in a "private" network, but still have ...
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1answer
417 views

What makes Lustre faster and more scalable than NFS?

I have read in various places (e.g. here and here) that NFS' I/O performance does not scale, while Lustre's does, and that Lustre can deliver better I/O rates in general. There seem to be various ...
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3answers
90 views

Clustered machines management

Our startup firm runs multiple services hosted on JBoss AS. Those services are distinguished by their business and are clustered for the sake of high availability and scalability. What I'm looking ...
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1answer
518 views

What applications can be used in a Red Hat/CentOS cluster?

When I look at the Red Hat cluster manuals 1 2, they only explain how to install it but not what applications can use it. I am new to clusters, so I don't know these things =) Let's say I want to 3 ...
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1answer
39 views

NetApp cluster fail to start

I have a big problem with my FAS2020 (configured as iScsi storage for 2 esxi 4 server). I couldn't ping the 2 ip address of the FAS so I connect by the serial port with putty for monitoring the boot ...
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1answer
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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 ...
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3answers
495 views

3 Servers, is this is a cluster?

At the moment I have one Ubuntu server, 9.10, running with a simple Samba share, a mail server, DNS server and DHCP server. Mostly its just there for file sharing and email server. I also have 2 ...
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1answer
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Unresponsive ESXi 5.5 server

I have a host that is part of a 4 host cluster in HA. Sometime yesterday I noticed the host stopped responding, in the vsphere console it shows up greyed out as (not responding) and all VMs on it ...
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2answers
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Graphite/Carbon cluster returning incomplete data

Trying to setup a Graphite/Carbon cluster. I have an elastic load balancer that directs traffic between two nodes in my cluster, each with one web app, relay, and cache. In this example, I sent 1000 ...
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2answers
79 views

Is it possible to have automatic failover of a windows service without windows clustering?

Due to a partial failure of our SAN we have switched our message queuing (Active MQ) from using network storage to using local storage. Because the secondary server is no longer sharing the same ...
3
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1answer
5k views

JBoss 7.1.1 Clustering, JBAS014775:New missing/unsatisfied dependencies

I am following https://docs.jboss.org/author/display/AS71/AS7+Cluster+Howto I managed to get 2 servers running. One slave. One master. I managed to get to "Dry Run" I got: [Host Controller] ...
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2answers
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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 ...
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2answers
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Windows Cluster - Can I failover without disturbing SQL?

I have a 3 node cluster. All of the nodes are part of Cluster01 in what should be A/A/P mode. Usually instanceA and instanceB of SQL Server would reside on NodeA and NodeB respectively. the windows ...
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1answer
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Are there problems teaming the public network adapters on a Windows Server 2008 R2 failover cluster?

We have a two-node Windows Server 2008 R2 fail-over cluster that's hosting about a dozen instances of SQL Server. The nodes each have four network adapters in them (a pair of dual-port Broadcom ...