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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95 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 ...
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1answer
73 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
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1answer
209 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 ...
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2answers
76 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" : ...
0
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1answer
871 views

SQL Cluster P2V Physical to Virtual Migration tips?

Need tips for those migrating a MSSQL cluster to a single Hyper-V guest VM. Context: these are P2V (Physical to Virtual) of only one node, taking a snapshot of all drives and dismantling/destroying ...
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1answer
149 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 ...
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2answers
1k 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 ...
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2answers
208 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
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1answer
595 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 ...
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1answer
112 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 ...
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1answer
375 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 ...
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1answer
87 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 ...
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1answer
532 views

keepalived 2 VIP and 2 servers

Is it possible to configure keepalived in a such 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
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2answers
2k 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
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1answer
589 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
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1answer
86 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
29 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 ...
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2answers
97 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 ...
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3answers
159 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. ...
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3answers
4k 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 ...
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1answer
189 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.
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1answer
104 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 ...
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1answer
64 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
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1answer
201 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 ...
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1answer
332 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
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1answer
246 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 ...
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1answer
291 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 ...
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0answers
386 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 ...
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1answer
234 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 ...
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0answers
53 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.
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1answer
42 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 ...
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1answer
244 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 ...
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2answers
166 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
152 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 ...
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0answers
59 views

Can a File Server resource be brought online if there is no dependency Disk provided in Microsoft Failover Cluster?

We have a Failover cluster having 2 nodes and we have set up a File Server resource which has 3 disks related to 3 File Server resources. I tried to create a new File Server share in that same service ...
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2answers
185 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
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1answer
107 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
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1answer
106 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
340 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 ...
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1answer
204 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
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1answer
203 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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1answer
67 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
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3answers
275 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
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1answer
315 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
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4answers
2k 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
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1answer
148 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
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1answer
539 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
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0answers
60 views

Application server clustering with no single point of failure

I have a web application, A, that returns a number of files, stored on disk and in memory, based on client device requests. This web application has to scale for a huge amount of users. I am using a ...
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2answers
50 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
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1answer
2k 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 ...