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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8
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2answers
259 views

A roundrobin for incoming files

A bunch of new files with unique filenames regularly "appears"1 on one server. (Like hundreds GBs of new data daily, solution should be scalable to terabytes. Each file is several megabytes large, up ...
1
vote
2answers
41 views

2008 Clustered Services (SQL) to 2008 R2 Clustered Services

I've found plenty of articles for upgrading SQL in a clustered environment from SQL 2008 to SQL 2008 R2. However, I have not found much information in relation to migrating a current Server 2008 ...
0
votes
1answer
99 views

LDAP URL example: is it possible / correct to use only the domain without the hostname?

We have an application which connects to an Active Directory (MS) using LDAP protocol. We give usually the following parameters: ldapUrl = ldap://myserver.mydomain.ext:389 ldapBaseDn = ...
1
vote
1answer
882 views

Haproxy [24890]:proxy farm has no server avaiable

I am trying to setup cluster with haproxy, I have one load balancer and two nodes. Some how haproxy is only taking one node. It runs fine until one XXX.XX.X.196 is up and running but as soon as i shut ...
3
votes
2answers
77 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 ...
2
votes
1answer
536 views

glassfish cluster fail at start

I got a problem trying to set a cluster up. I'm gonna describe detailed configuration(since I couldn't find a cluster example made on two different pcs, all of them were made on one localhost): 3 ...
1
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2answers
46 views

Certificates for clusters

I have read the various threads regarding clusters (behind the load balancer) and certificates. I am trying to implement this in our company. Firstly Our compnay policy is not to allow exporting of ...
0
votes
0answers
505 views

Setting up computational cluster using infiniband fails

My task: I need to assemble computational cluster, consists of two nodes using infiniband technology. When I try to start mpirun ... for two nodes, the process hangs. If i try to use flag ...
-3
votes
1answer
130 views

Mysql Cluster Sharding/partitioning [closed]

Ok so i have mysql cluster setup but what i need is say table assets to be split among the nodes, not replicated. as the purpose of me setting up the cluster was due to lack of hard drive space so how ...
1
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0answers
1k views

Confusion setting up a simple tomcat6 clustering on ubuntu 12.04 using mod_jk: status page won't show

am a little confused when setting up 2 tomcat6 instances cluster in a clean ubuntu server 12.04. i didn't install default tomcat6 i used tomcat6-user's tomcat6-instance-create to create 2 instances. ...
0
votes
1answer
275 views

Memcached distribution

I have a question about memcached distribution across nodes. We have 20 memcached nodes with 200GB memcached on each. Our apps are PHP apps. $memcache->setOption(Memcached::OPT_DISTRIBUTION, ...
0
votes
0answers
424 views

What is a logical web address, when using a loadbalancer for distributing load among clustered web applications?

In Oracle docs, I keep coming across the term 'Logical web address (LWA)', and this concept is especially useful while setting up a load balanced application. I couldn't find any documentation on ...
3
votes
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 ...
0
votes
1answer
97 views

In search of a distributed file-level filesystem [closed]

I'm looking for a distributed, fault-tolerant file-level (not block-level, preferably) filesystem for use in a small Linux-based HA cluster of sorts. The files that are stored will be fairly small ...
1
vote
0answers
282 views

How to bind CIFS server to virtual IP in Windows Server 2012?

I'm a unix guy who is new to clustering with Windows. I have two Windows 2012 servers that have the StorNext clustered filesystem mounted as drives on each. If I try to add the File Sharing role, I ...
-3
votes
1answer
88 views

Windows or Linux cluster [closed]

I'm thinking on making a computing cluster at home to render things that I do in 3d programs like blender, maya and UDK. can I use a linux cluster enen though UDK only runs on on windows or am I ...
0
votes
0answers
63 views

How could I share data from a SAN?

I am considering deploying a SAN but I have found contradictory information. The thing is that I would like my cluster nodes to be able to read the same data from a unique source (I have a ...
1
vote
1answer
191 views

Red-Hat Cluster failover notification?

Is there anyway to get a notification / setup a notification mechanizem when the cluster fails over?
0
votes
1answer
251 views

mysql cluster .net client connection which host

I'm trying mysql cluster to use in a project for our customer. The configuration I setted up is the following: **Hardware S.O. equipment** Server1 - S.O. Windows 2008 R2 64bit Server2 - S.O. ...
0
votes
1answer
289 views

Does 'top' show memory / CPU usage of parallel processes on cluster?

Recently inherited a neglected cluster: I'm trying to do some sanity checks on it. Running a benchmark on node X and then running 'top' shows high cpu usage from mpi processes (as expected), but on ...
0
votes
2answers
249 views

Autoscaling set-up on EC2

I'm new to web development and design (I moved over from construction where answers are much larger), and I'm trying to build a scalable AWS architecture for a Wordpress site that lives in the free ...
0
votes
1answer
115 views

Aggregate switch ports to go through different iptables servers acting as firewalls?

Scenario: One internet connection with the need to firewall a very high number of pps, without having to invest in expensive hardware firewalls. I do not have a specific number of pps to aim after, ...
0
votes
1answer
527 views

MySQL Cluster SQL Node not synchronizing

I am new to MySQL Cluster and am trying to setup a new cluster for our new application. Here is what I have set up on 5 CentOS 64 bit VM and got the cluster to work using MySQL Cluster 7.2. I am ...
0
votes
1answer
208 views

Basics on setting up a hyper-v cluser on a Windows 8 host

I'm a complete newbie to setting up servers and clustering, so baby gloves please :) I am trying to simulate a cluster of 4 nodes on my windows 8 laptop using hyper-v (its a beefy laptop, so don't ...
0
votes
1answer
95 views

Exchange setup with dual Mailbox/DAG role

I inherited a newly created Exchange 2010 environment that has two servers with dual Mailbox and DAG roles on each, basically trying to accomplish the failover clustering that Exchange 2003 had. ...
2
votes
1answer
662 views

How can I repair dir total-size with gluster self-heal

I build a glusterfs cluster, and the type is the Striped Replicated Volumes with 4 servers like that: Volume Name: test-volume Type: Striped-Replicate Volume ID: bdb596e6-a7d2-44a4-8791-1b4fdc57469c ...
0
votes
2answers
336 views

remove a mongodb replica set when into a sharding cluster

I have this configuration: mongos> db.adminCommand('getShardMap') { "map" : { "RS13" : "RS13/mongo09-02:27003,mongo09-01:27001", "RS13/mongo09-02:27003,mongo09-01:27001" : ...
-3
votes
1answer
249 views

Local disk recomendations for Hyper-V 2012 nodes? [closed]

Are there any local hard drive recommendations for Hyper-V 2012 nodes, running in cluster using SAN for VM's? Are the local hard drive only used for running the Hypervisor or is it used for ...
2
votes
2answers
3k views

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 ...
0
votes
2answers
292 views

Building a web server cluster, how? [closed]

I am a student in IT and I have been asked to build a web server cluster for multiple websites. After 2 weeks of searching, reading and testing, I came here to ask for help. What we want is a cluster ...
2
votes
1answer
840 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 ...
0
votes
1answer
149 views

How to build a personal cluster?

I have a debian server running some services (mail, web, git, mysql...). But it is alone, meaning that if it breaks, I have to repair it to access my services. I'd like to put a second server so that ...
1
vote
1answer
1k views

RabbitMQ - unexpected empty and unsynchronized queues after cluster node failure

I have downloaded and installed RabbitMQ in cluster on Windows: downloaded and installed ERLANG and RABBITMQ on two servers (for example Alpha and Bravo) installed management plugin, set custom ...
0
votes
1answer
181 views

Red-Hat Cluster doesnt migrate services on node shutdown

I have a RHCS with two nodes and manual fencing. when I restart Node 1 (the primary) it migrates both services to Node 2 automatically. but when I shutdown Node 1, it doesnt happen and I need to use ...
2
votes
1answer
2k views

keepalived 2 VIP and 2 servers

Is it possible to configure keepalived in such a way? In normal state VIP_1 assigned to SERVER_1 and VIP_2 assigned to SERVER_2 On server failure all VIP's going to working server, and after failed ...
3
votes
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 ...
5
votes
2answers
2k views

Linux Filesystem options for iSCSI shared storage

I am trying to determine my 'best choice' for a filesystem to use for a shared storage device that will be mounted via iSCSI across an indeterminate number of servers. Setup: 27TB Synology RS2212+ ...
3
votes
1answer
130 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 ...
-2
votes
2answers
31 views

resource description in a server-cluster [closed]

I am searching for a way to describe resources/services on a server-cluster but couldn't find a proper solution yet although I actually think there should be one. We're running here a bunch of ...
1
vote
2answers
135 views

Inter-site linking with a WAN cluster infrastructure

I am planning to deploy an infrastructure of 11 nodes using Opscode Chef, providing for a high availability web application. I would like to spread the nodes across datacentres for availability, for ...
1
vote
3answers
187 views

Appropriate network file system for huge (5+ Gb) files

I've got a number of servers used for HPC / cluster computing and I noticed that, given the fact that part of the computations they run use huge files over NFS, this causes significant bottlenecks. ...
8
votes
3answers
11k views

Are ZFS clustered filesystems possible?

Is it possible to create a ZFS cluster? Or would you need to go the seemingly ugly (to me at least) route of ZFS with UFS formatted pools governed by GlusterFS? The idea is to see if it is possible ...
1
vote
1answer
481 views

Installing a RabbitMQ cluster using puppet [closed]

Is there an existing puppet module that installs a RabbitMQ in cluster mode? A module I can base on my solution is good as well.
0
votes
1answer
199 views

Convert clustered LVM volume group to stand alone

I am running clustered LVM, and I need to convert my cLVM VGs back to stand alone. It appears that I should be able to run "vgchange -c n " with out losing any LVs. The only thing I need to do is ...
-1
votes
1answer
65 views

How to migrate a webapplication to a cluster?

I have a python web application running on linux nginx + uwsgi. I am currently running this on a single machine. I would like to migrate this setup to a cluster. I am new to clusters. What are the ...
4
votes
1answer
452 views

Nginx - multiple servers configuration

I have a cluster of 8 independent web servers, each of them running nginx. They are all hosting the same websites and are being synced with rsync. Also, each server has 8 different IP addresses ...
1
vote
1answer
798 views

Windows failover cluster - Delegate permissions to Domain user to move a group to another node

Is it somehow possible to assign permisions to non-admin user to monitor and move cluster group? Is there any workaround for this? I'm interested in Windows server 2008 r2 and 2012. I'm avare there ...
0
votes
1answer
447 views

What is a reasonable latency time for mpdringtest with gigabit ethernet?

Hi I have a small test network that I'm using to do some number crunching for my dissertation. My network consists of three machines with intel gigabit network cards (all em drivers with two hosts ...
0
votes
1answer
530 views

What is the best storage for active-active linux cluster? [closed]

We have a cluster with multiple ubuntu machines which are connected to a shared SAN storage. Initially we were using OCFS2 as file system but we were hit with so many issues and we couldn't find ...
4
votes
0answers
533 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 ...