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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281 views

Linux HA - Best Heartbeat hardware solution

Hi all I would ask anyone what is the best layer 2 medium for heartbeat in Linux and how it's best configured. More precisely I've been thinking about a dedicated NIC for that purpose but then i ...
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2answers
9k views

How to setup STONITH in a 2-node active/passive linux HA pacemaker cluster?

I am trying to setup an active/passive (2 nodes) Linux-HA cluster with corosync and pacemaker to hold a PostgreSQL-Database up and running. It works via DRBD and a service-ip. If node1 fails, node2 ...
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2answers
617 views

How to correctly set up iWARP? Preferably on loopback

iWARP is a protocol for doing remote direct memory access (RDMA) on top of TCP/IP, so that it can work with Ethernet and other network types as opposed to Infiniband. It works with many of the ...
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2answers
173 views

Server Cluster Design/Setup [closed]

OK So I am not sure if this is posted already but let me explain my goal and what I am trying to do. Really need some help on this as I am not really linux or server savvy yet. I know the basics with ...
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1answer
104 views

Cannot resolve cluster resources on EC2?

I have created this cluster on Amazon's EC2 service. I can connect to the sql instance from the first node (there is only one node in the cluster at this time) using the cluster name, so I know that ...
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1answer
146 views

Unable to connect to MySQL cluster database

I am unable to connect to mysql cluster database after starting my management node, data node, mysql node. I made the necessary changes by adding the loadbalance in the dbURL. But I am not able to ...
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1answer
364 views

Clustered MSMQ can't send to queue in another forest

I have MSMQ running on a two-node Windows 2003 cluster. When I try to send transactional messages to a queue on a Windows 2008 server in another forest, the messages get stuck in the cluster's ...
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0answers
63 views

MySQL cluster data node replacement

I have a MySQL cluster with 2 data storage nodes running from last 2 years. Just recently I have observed a hardware issue in one of the nodes (data storage). I may need to replace this node with new ...
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1answer
446 views

Ganeti and automatic failover

I'm building a simple 2-node cluster with Ganeti+DRBD... What is the recommended way to setup automatic failover? I'm used to Heartbeat, but they say it should be avoided with my setup.
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1answer
700 views

Best RAID setup for DRBD

I would like to setup a two nodes PROXMOX cluster with DRBD storage. The nodes will be connected by gigabit ethernet. What would be the best storage setup in terms of reliability, performance and ...
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3answers
703 views

Cloud Storage as a File Share Witness?

Does anyone know if there is a service out there that can be used as a file share witness for a Windows Server 2008 R2 Failover Cluster File share witness? I have a two-node cluster but no good place ...
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1answer
405 views

Lost Clustered disk in Windows 2008 R1 SQL Cluster

I currently am running a 2008 R1 64 bit cluster. Last night I get called by our first tier support that we have a failed cluster disk. At 5PM we received the following error: Cluster physical ...
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1answer
619 views

How to run multiple Heartbeat/Corosync/Pacemaker clusters in the same network? (Quorum)

We intend to run several components to run a web site. Like a load balancer, a cache and a couple of web serserves. To avoid single-points-of-failure we intended to use Heartbeat/Corosync/Pacemaker ...
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2answers
696 views

How do Active Directory domain joined computers (native MS Windows or Linux with winbind) determine the closest password server?

How do Active Directory domain joined computers (native MS Windows or Linux with winbind) determine the closest password server? This question implies a cluster with 2+ Active Directory servers in ...
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1answer
270 views

Boost libraries ! :( [closed]

I am in the process of running some tests on a cluster which has CENTOS 5 x86_64 kernel 2.6.18. I need to install a software there which needs boost>=1.42. I have looked around but cant seem to find ...
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4answers
3k views

Ganeti vs Proxmox [closed]

I'm system administrator in small software house. I'm going to virtualise our servers. The main reason for doing this is providing highest possible uptime, but probably it will also increase resources ...
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2answers
2k views

Windows 2008 r2 2 node cluster - one node unavailable

I have 2 node Windows 2008 r2 cluster, i failed over service onto node2, restarted node1, and after restart node1 is unavailable. The networks interfaces will not come up and both interface are ...
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1answer
704 views

What's the best way to manage product images in a Magento Cluster?

I'm running Magento CE on multiple web node. The Admin Backend is always running on the same server, so all the images are uploaded on this server. On my
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2answers
311 views

Calculating the power of a cluster vs a single workstation [closed]

For the same price we can get either Worktsation which is 2 x 6 core Xeons 3.4GHz, 128GB RAM, 600GB SAS RAID 0 = 12 Cores, 128GB RAM Or Cluster 8 x (4 Core i7 3.4GHz, 16GB RAM, 250GB SATA, Intel ...
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1answer
525 views

Configuring a Beowulf cluster with Mosix

Here's the situation: We're trying to build a Beowulf cluster using Mosix. At first, we're testing everything on VMWare, but we want to deploy it on actual hardware in the near future. However, it ...
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0answers
258 views

Blazeds with Jboss Clustering ( Mod_JK with SSL )

We are running our flex application in jboss clustering environment with the help of Apache mod_jk(Apache Web server as front end with mod_ssl enabled). We are using the SecureAMFChannel as we deploy ...
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1answer
148 views

OpenMPI in SGE fails when not observed

I know the topic is weird but so is my problem. On our cluster we have SGE with OpenMPI compiled for tight integration. When I set it up it worked just fine in my tests and so far there have been no ...
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1answer
252 views

SQL Server 2005 SP3 Failover Cluster Node Replacement Service Pack

2-node SQL Server 2005 SP3 (9.0.4226) Failover Cluster running on Windows Server 2003 R2 x64 SP2. My passive node suffered a RAID failure on the OS partition. I evicted the failed node, rebuilt it, ...
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1answer
2k views

Configuring transactional MSMQ on load-balanced servers

I've got a solution running on a single server right now that uses transactional private queues (msmq/wcf). Windows services consume and process messages on the queues, and the web application layer ...
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1answer
3k views

WebLogic cluster, determine node from JSESSIONID cookie

We are running a WebLogic 10.3.4 cluster with three managed servers (nodes). We do not use session stickyness, but session replication across the cluster and everything is working fine. When trying to ...
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107 views

Resources for setting up clustered FTP servers on CentOS?

Does anyone have any resources that can lead me to a how-to or at least more information on setting up clustered FTP servers on CentOS? I'm very new to servers in general (all I've done is set up a ...
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2answers
4k views

How good is failover of the iSCSI target on a two-node linux san?

I'm evaluating the possibility to use two off the shelf servers to build a cheap iSCSI redundant SAN. The idea is to run linux, pacemaker, and an iSCSI target - something like the SAN Active-Passive ...
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1answer
315 views

DPM 2010 - Performance when backing up Hyper-V Cluster

At my company we are backing up about 150 Hyper-v VMs in an Hyper-v cluster using CSVs (Windows 2008 R2). The space used by these VMs is about 18TB on SAN storage and 1GB network. We are using DPM ...
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1answer
204 views

Postgresql 8.3 out of disk space on Debian Lenny

I didn't pay attention when i installed postgresql with aptitude, but it installed the databases in the wrong partition. Now my partitions look like this: # df -h Filesystem Size Used ...
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2answers
368 views

Clustering TCP servers, so can send data to all clients

I'm developing a real-time mobile app by setting up a TCP connection between the app and server backend. Each user can send messages to all other users. (I'm making the TCP server in Python with ...
3
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3answers
88 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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1answer
108 views

Clustered file system on Linux

This is quite a general question but I need some advice on clustering apache linux servers ideally on VM. I have some apache servers that are being using that are highly used on space (i.e. each ...
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2answers
74 views

Clustering on Virtual Machine

Can you cluster/load balance on a virtual machine? I figured that would be redundant if the same machine is still performing the work but in virtual areas, or am I wrong?
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3answers
1k views

Upgrading ubuntu release on a cluster of servers

I have a cluster of about 50 ubuntu nodes which are currently running maverick release. I'd like to upgrade them to oneiric, but I'm having a difficulty choosing the right tools. I know ubuntu has ...
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1answer
218 views

Remotely connecting to hyper-v hosts from another host in the same cluster sometimes shows red error

We have a hyper-v host cluster with relatively new hardware. The hosts and the VMs on them all work good, except when I connect to any hyper-v host from another host in the same cluster (remotely ...
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1answer
968 views

Tomcat mod_jk cluster skip 404 http status

I am trying Tomcat Clustering with mod_jk for months and so far not so bad but facing a problem during deployment. I am using FarmDeployer to copy and deploy the WAR to other nodes in the cluster but ...
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1answer
6k views

Load Balancing and Clustering using mod_proxy_ajp on Apache HTTP Server 2.2.21 and Tomcat 7.0.23

I've been struggling to make load balancing and clustering working using these combination: Apache HTTP Server 2.2.21 (httpd-2.2.21-win32-x86-openssl-0.9.8r) using mod_proxy_ajp with sticky session ...
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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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0answers
241 views

I'm building a diskless php-fpm cluster, unpredictable /etc/statetab and looking for other building strategy

I'm building a 24 nodes php-fpm farm using three Supermicro MicroCloud (8 nodes in 3U, nice and tight) At first, I was planning to have each of them nodes have a disposable HDD with CentOS on (6 or 5 ...
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1answer
304 views

Is it possible to install SQL instances with different Collations in a SQL Cluster

We have a two node active-active SQL Server 2008 Cluster. Running on Windows Server 2008 R2. The three excisting instances have Latin1_General_CI_AS as the Server Collation. I need to add an instance ...
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1answer
336 views

Pacemaker behavior colocation Xen domU resources, is this expected?

I am using Pacemaker+OpenAIS+Corosync on OpenSuSE 11.3 running Xen, and am trying to determine if the behavior I see when colocating Xen domU resources is expected or not. Cluster nodes / dom0: ...
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1answer
321 views

Glassfish 3 Cluster and Local init scripts

I'm trying to set-up a Glassfish 3.1.1 Cluster for testing purposes. Currently, I've got 2 hosts with Glassfish 3.1.1 installed. I've set-up a DAS domain on host1, and followed this guide to create ...
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1answer
1k views

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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4answers
546 views

A better inexpensive 2 node cluster

There is a Xen cluster that setup that I really like. It consists of 2 nodes (let's call them 1 and 2). Each node has 2 non-raided drives (A and B). A1 replicates to A2 through DRBD and B2 to B1. ...
2
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1answer
138 views

double mount check with ext3

I have two nodes connected to a SAN, and I want to be able to mount an ext3 partition on node B when node A goes down. I know I could use a shared filesystem, but for simplicity and performance I ...
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1answer
90 views

oracle RAC server addition at DR site after DR occurs

DB: Oracle Server: Physical OS: Linux 5.5 The production site contains 3 server nodes and will be clustered using Oracle RAC, database replication will be done with the help of Oracle Data guard. ...
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3answers
205 views

Setting up Tomcat on shared drive for clustered environment

We have a production environment with externally load-balanced Tomcat servers running on multiple servers, serving HTTP requests and maintaining stick sessions. Due to lack of complete build and ...
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1answer
186 views

Using PCIe as an Interconnect Connection [closed]

I was researching about connecting multiple server nodes together to share resources. I came up to this page: http://www.plxtech.com/applications/cloud From what I read, I see this is possible. ...
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5answers
2k views

Clustering F5 Big-IP Devices; Is it Possible?

I developed a web application. It will run on a farm of five IIS servers. It's absolutely essential that once a session is established with a server in the farm, further HTTP requests within that ...
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1answer
222 views

Network GURUs - IP failover combined with load-balancing… Is there such software? Is it possible?

I've been playing around with high-availability solutions for a few days and so far I find UCARP very useful for IP fail-overing. It's dead simple and does the job. I was thinking about taking it a ...