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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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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5answers
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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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1answer
3k 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
236 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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1answer
2k views

what is gen_clust_index used for in mysql?

It seems I have a deadlock in mysql (running innodb) that's due in part to a lock on gen_clust_index, however, this isn't a table that I've created. So... what's the short and sweet description of ...
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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
762 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
86 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
16k 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
1k views

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
652 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
10k views

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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1answer
296 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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6answers
1k views

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
498 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
33 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
4k 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 ...
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1answer
2k views

Overlapping queues on Sun Grid Engine?

We would like to have an SGE-based compute cluster with a queue that gives access to all nodes for the computational staff, and a second cluster queue that gives access to, say, half the nodes for ...
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4answers
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Windows Failover Cluster for MSMQ without SAN?

Is it possible to create a 3 node Windows Server 2008 R2 failover cluster without a SAN? Our goal is to create a clustered MSMQ without any single points of failure. Ideally, the stored messages ...
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3answers
490 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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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
70 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 ...
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1answer
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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
2k 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 ...
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2answers
231 views

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 ...
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2answers
4k views

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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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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4answers
770 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
89 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
943 views

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
5k 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
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1answer
237 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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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 ...
3
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1answer
299 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
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High Availability NFS Server (Heartbeat/DRBD) long hang on clients when takeover occurs

We have a High Availability NFS environment using DRBD, heartbeat and nfs exposed to clients (Simular to the following https://help.ubuntu.com/community/HighlyAvailableNFS ). This seems to be a ...
3
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1answer
330 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 ...
3
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2answers
467 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 ...
3
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1answer
1k views

Migrating Windows 2003 File Server Cluster to Windows 2008 R2 Standalone?

We have a situation where we have an aging Windows 2003 File Server Cluster that we'd like to move to a standalone Windows Server 2008 R2 VM that resides in our Hyper-V R2 installation. We see no ...
3
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2answers
197 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
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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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1answer
606 views

Distributed File Systems

So, I've been reading several articles around ServerFault as well as google. (For Example, this link) My Requirements are very similar to the link above, however i'd like to also have dynamic or at ...
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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
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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 ...