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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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
707 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
85 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
9k 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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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
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
2k views

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? ...
3
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1answer
688 views

DB Full Vacuum, Cluster, Analyze - in which order?

I have a huge (~150 GBytes) postgresql database whose performance has dropped during the last weeks. In order to improve performance, I intend to perform FULL VACUUM, CLUSTER and ANALYZE. In which ...
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3answers
640 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
8k 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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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
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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
489 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
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 ...
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1answer
1k 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
3k views

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
484 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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4answers
886 views

Multiple servers acting like a single one with all the hardware?

by now I have 10 servers for hpc, power computing oriented. My users need to launch several processes using qmake. The users are used to work with ubuntu 9.10, and the software from the repositories ...
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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
67 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
4k 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
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 ...
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2answers
207 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
3k 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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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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4answers
720 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
702 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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1answer
215 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
276 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 ...
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1answer
320 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
383 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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1answer
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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 ...
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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
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 ...
3
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1answer
600 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
2k views

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
5k 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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0answers
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+50

Why does requesting GPUs as a generic resource on a cluster running SLURM with the built-in plugin fail?

Disclaimer: This post is quite long as I tried to provide all relevant configuration information. Status and Problem: I adminster a gpu cluster and I want to use slurm for job management. ...
3
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1answer
114 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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0answers
166 views

RabbitMQ - How I do configure servers for zero-downtime upgrades?

Having read through the docs and RabbitMQ in Action, creating a RabbitMQ cluster seems straightforward enough, but upgrading or patching an existing RabbitMQ cluster seems to require the whole cluster ...
3
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1answer
1k 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: ...
3
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1answer
188 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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2answers
4k 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
115 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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0answers
484 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
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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 ...