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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5
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1k 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
121 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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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
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2answers
131 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
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3answers
182 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. ...
6
votes
3answers
9k 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
375 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
163 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
364 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
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1answer
689 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
415 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
456 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
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0answers
514 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 ...
0
votes
1answer
373 views

Running parallel job in a linux cluster - mpich error

First of all I would like to say it is my first message here and I'm not sure this the right place, I guess it us but... If it fits better in another stackexchange site please let me know. It's three ...
1
vote
0answers
86 views

OSPF on XEN host running several VMs

Is it possible to set OSPFs areas in a XEN environment to setup a virtual cluster? Main intention is to avoid a external router since all VMs will run inside the same machine.
0
votes
1answer
62 views

How do we configure Lustre to block client requests when under load, rather than failing?

We are using Lustre in a cluster with approximately 200TB of storage, 12 Object Storage Targets (that connect to a DDN storage system using QDR Infiniband), and roughly 160 quad and 8-core compute ...
1
vote
1answer
389 views

Pacemaker cluster: Xen RA vs libvirt RA

Building a pacemaker cluster to manage Xen domU virtual machines the sysadm can choose between to different resource agents: the dedicated Xen resource agent (ocf:heartbeat:Xen) the libvirt based ...
0
votes
2answers
191 views

LVM in cluster — need an advice

I'm trying to configure a 2 node cluster with shared storage, but the configuration is probably little unusual. It is described below: Both nodes have access to a shared storage that has a number of ...
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0answers
251 views

Unable to remote desktop using failover cluster name

I am using Microsoft Failover Cluster and I have 2 nodes - say node1 & node2. The nodes are successfully accessed by remote desktop. but the cluster name is not accessible. The cluster name is ...
0
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2answers
306 views

SSH into a virtual IP

I am attempting to SSH into a virtual IP on a loadbalancer. I want to connect to this virtual host name and have it connect me to one of the virtual hosts. The problem is when I try to ssh to the ...
2
votes
1answer
157 views

puppet templates: possible to print the size of an exported resource array?

I'm writing a puppet module for ocfs2 and making use of exported resources to populate the definitions of all the cluster nodes in the config file on each cluster. This all works well. The cluster ...
0
votes
2answers
269 views

Creating New WebSphere cluster

I need to improve WAS perfomance and want to make cluster. I have two separate machines with WebSpphere 7 on it. As I see to do this, I need to add node from my second (remote) WAS to the first one. ...
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0answers
554 views

CMAN: using SBD (Storage Based Death) and watchdog as STONITH

I'm building up a 2-node cluster based on CMAN + Pacemaker cluster stack, but I have no hardware STONITH devices. However both nodes are connected to a shared storage via iSCSI and I would like to use ...
1
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1answer
408 views

Advantage of Microsoft Cluster over Microsoft Network Load Balancer

Till recently, I assumed that Microsoft NLB worked at an OS/Machine level rather than an Application Level. i.e. the NLB just monitors heartbeats on the machine to check if machine is alive and then ...
0
votes
1answer
399 views

How to setup cluster of virtual machines to host web application with fail-over redundancy?

I would like to know how to setup a cluster of virtual machines to host a web application. We are expecting a high volume of clients connecting. I would like a cluster of virtual machines (or ...
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votes
1answer
73 views

Highavailability/Global Loadbalancing of clusters [closed]

I know this website 1channel.ch which has like 4 servers in 4 different datacenters across the globe (czech republic, estonia, sweden, germany). What happens is as i am browsing this website the ...
0
votes
3answers
658 views

Websphere ND Dmgr - Application Server collocation advantages and disadvantages

In a Websphere Network Deployment Architecture, what would be the drawbacks of collocating a deployment manager server with one or more managed application servers on the same host? In other words, ...
1
vote
1answer
572 views

Hyper-V Redundancy without Domain

We currently run a Hyper-V server on a non-domain W2008 server, and are looking to build a failover solution. Because all the (6-10) VM guests are linuxes, and our datacenter space is 90% non ...
9
votes
4answers
3k views

DIY Hadoop Cluster - Heat & Dust issues?

Following are links of my DIY 6-Node Hadoop Cluster using i3 Machines, What is the best possible way to protect my design from dust & provide better heat transfer? What should I use to cover ...
0
votes
1answer
229 views

HA Options for Windows Servers

We are looking at different options to allow us to stay up and running when our primary datacenter (DC1) goes down for any reason. What is the main difference in having a offsite server updated all ...
2
votes
1answer
776 views

Microsoft fail over cluster and storage with raid card

I am looking for some input on a Microsoft fail over cluster implementation on 2012. To use the storage and pools it apparently has to have JBODS if your using a raid card. But the LSI card we use ...
0
votes
2answers
60 views

SSL certificate on cluster server

could you please advice how to apply SSL certs on web servers behind a load balance server. Do we need to apply SSL certs on all the web servers or apply it to the load balancer only. scenario: if we ...
5
votes
1answer
4k views

mount.ocfs2: Transport endpoint is not connected while mounting…?

I have replaced a dead node that was running in dual-primary mode with OCFS2. All the steps work: /proc/drbd version: 8.3.13 (api:88/proto:86-96) GIT-hash: 83ca112086600faacab2f157bc5a9324f7bd7f77 ...
0
votes
1answer
209 views

Chef Integration Tasks Best Practices

I am new to chef (using hosted chef server) and am muddling along ok and basically understand how to provision individual servers. What I am having trouble with is figuring out how to integrate the ...
0
votes
1answer
189 views

How virtual ip shifts between two nodes

In redhat clustering (HA), Due to lack of knowledge on clustering, If the master node fails the virtual ip will be shifted to slave and the second node becomes the master, how the shifting of virtual ...
1
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1answer
111 views

Benefits of ARR in a load balanced environment (Azure)?

I've built a simple IIS 8 web farm on Azure VMs. The web farm has 3 instances (Windows Server 2012) using shared configuration. The load balancing is handled by the Azure's built-in load balancer. ...
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votes
1answer
39 views

Exploit monetarily a large unused cluster [closed]

At work we have a 200 core unused cluster, most of the researchers working here just left and nowadays almost nobody uses it. We would take advantage of it. Previously somebody asked it how to exploit ...
2
votes
1answer
2k views

Redhat cluster Vs Pacemaker Vs Gluster Vs Sheepdog

Changing the entire question as earlier one was very confusing. I have been exploring different clustering system to run Virtual machines on two different machines on LAN with high availability. ...
2
votes
4answers
588 views

Newbie questions on MAC and high availability failovers

I am reading about High Availability and I can not understand the following I read: On failover the primary IP migrates to the backup server BUT so must the MAC address. Specifically I read that ...
0
votes
3answers
93 views

Multiport NICs in servers and clusters [closed]

I wanted to know are multi-port NICs common in server systems? E.g in clustering are they used always?
1
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0answers
39 views

Partial mail sync for multi continent mail server expansion? [closed]

I am wondering if there is solution (we currently use Dovecot but another product is ok too), that would allow to setup a second Imap server (or proxy) that would work efficiently over slow links. An ...
1
vote
2answers
458 views

How to manage several Linux workstation like a cluster? [closed]

How does one go about managing a lab of Linux workstations? I'd like for users to be able to log in, run their GUI apps (LibreOffice, Firefox, Eclipse, etc), and for the computers to be able to be ...
1
vote
2answers
2k views

How to set up Zabbix to monitor SQL Server Failover Active-Passive Cluster?

It should be simple, so it is just most likely my approach being totally off and someone will hopefully prod me into the right direction. We have a Zabbix 2.0.3 server instance set up monitoring a ...
1
vote
1answer
510 views

Built local glibc, broke system, how do I ssh without parsing the .bashrc?

The cluster I am on had really old build tools and I needed to use CUDA5. I'm a pretty clever dude and I planned on building the necissary tools. So, I built a local copy of gcc, bintools, and ...
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votes
1answer
104 views

Relying on shared disks for heartbeat

I read somewhere that using shared disks for heartbeats is reliable even if network totally fails. I read it in the context of remedy from split-brain. Is this correct? But I can not understand this. ...
1
vote
1answer
249 views

Open MPI can't launch remote nodes via SSH

I am trying to set up Open MPI between a few machines on out network. Open MPI works fine locally, but I just can't get it to work on a remote node. I can ssh into the remote machine (without ...
1
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2answers
2k views

Heavy write to Galera cluster - table locked, cluster practically unusable

I set up Galera Cluster on 3 nodes. It works perfectly for reading data. I have done simple application to make some test on the cluster. Unfortunately I have to say that the Cluster fails totally ...
1
vote
2answers
984 views

Proxmox and PXE boot

I have 10 rack servers, each has an 80 GB hard drive, and a Dell PowerVault with no hard drives. It is possible to take all these hard drives and put them in the PowerVault cluster, then boot proxmox ...
1
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1answer
4k views

Windows 2012 Cluster on P6300 SCSI-3 Persistent Reservation issues

Scenario: 1 HP 6300 with latest XCS version 1 Command View 10.1 + with hosts defined as Windows 2008 2 BL460c Gen8 Servers with SPP 2012.10 and Windows Server 2012 Datacenter Edition with all the ...