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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244 views

How remote instances work on Coldfusion Clustering?

I have just decided to set up my site using ColdFusion clustering in the staging environment. I need to find out what code adjustments are required when we move to a cluster environment. I have two ...
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1answer
141 views

PostgreSQL asynchronous cluster with partial synchronous commits

We`re planning a complete synchronous PG Cluster with 3 nodes but we asked ourselves if its possible to have an asynchronous cluster with partial synchronous commits. Normally you make your cluster ...
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3answers
90 views

Is it safe to have backup and production servers in the same cluster?

I have two virtual servers maintained by the same provider. I asked them to place them on different physical machines. They told me that they placed them in different nodes of one cluster. I do not ...
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1answer
1k 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
102 views

Tomcat cluster - how to verify node starvation?

We have a tomcat cluster with a load balancer (haproxy). As part of our upgrade script we would like to starve a single tomcat in the cluster of 3, wait until all the requests are handled for that ...
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1answer
279 views

Does ColdFusion single server clustering using multiple instances provides any performance enhancement?

I have few doubts regarding Coldfusion clustering. Is there any benefits of Creating multiple instances of a single ColdFusion server, Create a cluster by adding those instances and host the ...
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2answers
338 views

Can I format a Veritas cluster shared volume from windows?

We have a Microsoft Failover Cluster with dynamic disks managed by Veritas Storage Foundation. Today the sysadmins added a new disk for SQL Server but the cluster size on the volume was wrong, so I ...
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2answers
9k views

Make a Docker application write to stdout

I'm deploying a 3rd-party application in compliance with the 12 factor advisory, and one of the points tell that application logs should be printed to stdout/stderr: then clustering software can ...
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1answer
830 views

IIS Shared Configuration Share for Cluster FTP Service on Server 2008 R2

Microsoft gives the following order for setting up the Clustered FTP (after installing IIS, FTP Service, and setting up your Cluster): Set up a file share that will be used for IIS Shared ...
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2k views

Does CoreOS have a cluster aware job scheduler?

Ive been checking out CoreOS and I'm impressed. Before I found CoreOS I was looking at the Mesos/Marathon/Chronos stack as a "cluster kernel". Given the following comparison: init.d == ...
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0answers
85 views

What do I need to increase my processing power?

Ok so I have written this program in Python 2.7 that runs on a desktop machine running Arch Linux. Without getting into the big details, this program takes a data-point, performs a series of ...
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5answers
167 views

send files to dozens of servers quickly

We have a cluster of machines (around 50 and growing). Each machine has a search index that needs to be updated multiple times per day. We currently update the index on each machine individually, but ...
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1answer
817 views

DFS Replication Manager on Failover Cluster Nodes

I currently have a VM architecture setup for high availability / manageability. The one point of failure is that I have a single windows 2008 machine that runs DFS replication across the servers in my ...
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1answer
2k views

Apache Kafka consumer client connecting to Apache Zookeeper: EndOfStreamException

I get an error when trying to 'consume' messages from Kafka (2.9.2-0.8.1) with a Zookeer stand-alone (3.4.5). You can see the source code below as well as the error message and logfile from Zookeeper. ...
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1answer
397 views

MSTDC in SQL Server 2012 - Windows Server 2012 R2 with high availability

We had implemented SQL Server High Availability on two physical servers over the VPN network. SQL Server 2012, Windows Server 2012 R2. It was noted that, Distributed Transaction was working perfectly ...
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1answer
223 views

Using DHCP, is it possible to obtain an IP address & MAC address for a cluster? [closed]

I know that DHCP assigns IP addresses, but does it also assign a MAC address? Is this a commonly used paradigm for cluster/cloud computing? Perhaps DHCP could be used to dynamically assign a new IP ...
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2answers
464 views

High Low priority queues SGE

I would like to have two queues in a CPU/GPU cluster, one with high priority and one with low priority. Thus, jobs that are submitted in the high priority queue will be bumped to the top of the list ...
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1answer
306 views

How can I run a CentOS (Red Hat) cluster in degraded mode?

I've installed Red Hat's cluster software on an install of CentOS 6.5, and use it to provide redundant routing from one network to another. This works fine, and I have a pair of boxes providing the ...
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1answer
378 views

Beowulf cluster storage setup [closed]

I'm a Computer Engineering student working on a project with a Verari blade cluster, a bit outdated for today standards. I had acquired some Unix experience but I'm not an expert at all. This Verari ...
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1answer
765 views

Pgpool configuration with Liferay cluster

I'm using a Liferay cluster connected to pgpool2 and when I run heavy user activity against the web servers I see a lot of exceptions regarding liferay unable to establish a connection to the DB. ...
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1answer
2k views

Failover Cluster Client Access Point Only Responds to Pings on the Owner Node

Background We're running two VMs (Windows Server 2012 R2) on Azure with SQL Server installed, set up as an availability group. We also, of course, have another VM as a dedicated DC. These are all ...
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1answer
859 views

MariaDB how to handle 2/3 node failure in multi master cluster.

I run 3 node multi master MariaDB galera cluster. It basically works for me how it is. When one node fails, two other work and it's fine. But I'm wondering is there a way for it to keep working on ...
2
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1answer
735 views

How can I store my ElasticSearch indexes/shards?

I'm trying to figure out how can I store the ES indexes. Actually I have two VMs running on 2 ESXi hosts, using 32GB vmdk... Wondering if i could share those data or is it necessary to have duplicate ...
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1answer
152 views

JBOD or RAID on a streaming server setup

Currently my setup is 1 main server which holds all the mp4 videos and 3 other servers which holds portions of this video. The process is: when a user uploads a video, it is stored into the main ...
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2answers
2k views

SQL Clustering or Hyper V Clustering

We will soon be implementing our Dynamics AX installation. Our aim is to have high availability and we are working closely with our implementers. We raised the question to them about SQL and Hyper-V ...
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801 views

Cannot ping Windows Cluster Nodes with Cluster IP on same subnet

I am facing a strange problem here, I have a 2 Node cluster, Node A and Node B. I cannot ping Nodes one another in MSCS Cluster with the Cluster IP even if they are on same subnet. I can ping one ...
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1answer
50 views

How to prevent load balancer from failing?

sorry if the question is a bit ambiguous but it is the first time for me to set up a load balancer and I am a little worried. I want to create a Glassfish Cluster, at the moment I am following this ...
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2answers
131 views

MySQL Replication threeway

We have MySQL Multi-Master replication setup between two servers ( A & B ). It has been working for a few years now and life is good. The management tool in our office connects directly to ...
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0answers
85 views

Hardware configuration for head nodes (HDDs, memory, processor, redundancy)

I'm designing a head node whose primary function is to submit jobs to the Torque/Maui scheduler and secondary function is to run test jobs. Unfortunately, most hardware selection guides for clusters ...
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1answer
501 views

What is a cluster IP? [closed]

I am in process or configuring remote web host service and I have option of configuring should I use cluster IP. Could some please explain what a cluster IP is and what are the benefits of using ...
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1answer
257 views

Session clustering with Jetty-runner 8.1.14.v20131031

I'm using Jetty-runner 8.1.14.v20131031 and I would like to know what's the easiest way to achieve session clustering between multiples running instances.
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1answer
165 views

Can I publish to multiple distinct etcd clusters from a single host?

I have a number of distinct etcd clusters, I would like to be centrally controlled: I have multiple distinct etcd clusters. Hosts in one cluster should not have any access to config in another ...
2
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1answer
491 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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2answers
431 views

Sharing a SAN LUN across 2 clients

I have an ISCSI SAN that we purchased to store images for our cluster (2TB of images). After reading, we probably should have gone with a NAS rather than a SAN, but back to the point. I'm going to ...
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0answers
538 views

SQL Server 2012 Cluster BSOD

I'm trying to set up a SQL Server 2012 SP1 "AlwaysOn Failover Cluster Instance" on top of a Windows Server 2012 R2 cluster (cl01) consisting of 2x 2012 R2 nodes (sql1 and sql2). Hosted on VMWare ESXi ...
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1answer
40 views

database cluster fail over [closed]

I planed to develop a customized HA program for MSSQL, but I got a question when reading some articles about cluster. When master is down, then slaves vote for a new master, and the new master will ...
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1answer
439 views

Openswan High Availablity

I have configured hardware(juniper) to software VPN(openswan) tunnel. I want to make openswan highly available. I was wondering if i can configure openswan cluster, but I didn't find anything ...
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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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0answers
42 views

pacemaker cluster heavy load with sbd and noop scheduler

Anybody have experience with nood scheduler? i know the sbd process is a real time process, so with default linux io scheduler cfq, the sbd process works very well on high io heave load. The noop ...
2
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1answer
383 views

Can I run multiple nodes of Cassandra on my mac without a virtual machine for each?

You can see in the doco here that setting up each instance of Cassandra requires a new 'node'. My question is - to run a cluster with multiple nodes of Cassandra on my Mac (Running Mavericks) - do I ...
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1answer
6k views

How can I move the data files for a VM to another location?

We have a cluster of 3 x 2008 R2 physical hosts running Hyper-V. How do I safely move the VHD(s) and accompanying XML files, etc, for a specific VM to a new location? I want to keep the VM with the ...
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0answers
438 views

RabbitMQ and federation. Cross datacenter virtual queue?

I'm building a system that sits in two datacenters for resiliancy, using a live / standby model. The system requires a message queue that delivers messages for processing by the system backend. My ...
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0answers
110 views

Multiple httpd with JBoss cluster: provide httpd HA

I have a working configuration like this: +-----+ +-----+ +-----+ +-----+ | i1 | | i2 | | i3 | ... | in | JBoss Cluster +--+--+ +--+--+ +--+--+ +--+--+ | ...
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3answers
7k views

How to set up a pacemaker cluster for active/active scenario and how it works?

I try to set up my first pacemaker cluster as a FTP Server. There are two Server installed with a fresh centos 6.5 and proftpd First step was to install pacemaker and some configuration Tools with: ...
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1answer
43 views

Dev mysql node with Percona

I have been tasked with creating a Development mysql instance, We currently have a 7 node Xtradb cluster, is there any way to have this node a few hours behind, or not allow replication back to the ...
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1answer
178 views

Failover clustering or Network Load Balance on windows server

I have 2 servers with Windows 2008 R2 standard OS. I need to create a cluster in case on of the servers goes down ; so the other one will continue provide services. The services we mostly use are a ...
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1answer
1k views

Does Win 2012 Standard Edition support clustering of SQL 2012 Enterprise Edition?

Can you cluster SQL 2012 Enterprise Edition on Win 2012 Standard Edition? The features doesn't seem to clarify whether it allowed or not. We are seeing warning “Cluster Nodes Failed" in the SQL ...
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3answers
2k views

Windows Server 2012 Hyper V Clustering Live migration Hot Failover

We are thinking of implementing Hyper V Clusteriazation on Windows server 2012 servers. We aim to use the Live migration feature to eliminate downtime when one of the servers fails. My question is: Is ...
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1answer
173 views

Best way to deploy changes in an HAProxy cluster

I have a two-node HAProxy cluster with Keepalived to provide high availability and redundancy. Now I'm trying to figure what is the best way to do changes in the configuration of my HAProxy's. Is ...
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1answer
138 views

Is a SSI-style cluster possible with Windows Server 2012?

I use an application that does CPU intensive multithreaded optimization which is currently run on a hyper-threaded Quad Core machine that it just pegs at 95-100% utilization across all cores for ...