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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Manaul SQL cluster failover on 2008R2

I need to do a restart of the clustered SQL instance to fix a problem with tempDB and i am not sure of the easiest way to do this. We have just upgraded our servers to Windows 2008R2 running SQL ...
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3answers
5k views

HAProxy cannot bind socket for proxy on a remote machine

I'm using HAProxy to load balance the incoming requests on my two tomcat backend servers. In the config file when I specify HAProxy to listen to the same machine on which the HAProxy is installed, ...
2
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1answer
395 views

Using ionice Over Cluster

Background: I use a computing cluster at work (4 slave nodes and 1 head node) that uses the SGE job scheduler. Recently we've been running jobs that do some heavy IO and it has been slowing down ...
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3answers
229 views

Converting our budget-strapped dev environment to ESXi - how to maximize availability on the cheap

We've already run through the process of virtualizing our production servers and now we want to do the same with our dev environment. However, our provider took care of all of the ESX host and cluster ...
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5answers
1k views

How to make AD highly available for applications that use it as an LDAP service

Our situation We currently have many web applications that use LDAP for authentication. For this, we point the web application to one of our AD domain controllers using the LDAPS port (636). When we ...
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2answers
826 views

Completely Remove an Exchange Cluster even though it's cluster info is long gone?

With the proviso that I realize I screwed the pooch on this, here's my situation. We used to have an Exchange 2003 two-node cluster. Several years back we migrated to Google Apps. When we did that, ...
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0answers
198 views

2008 R2 Cluster not failing over with iSCSI disconnect

So I have successfully set up a 2 node 2008 R2 cluster with SQL Server 2008. There are basically 3 networks. Public (client LAN) Private (Heartbeat between the two machines) iSCSI SAN (hosts ...
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2answers
61 views

Adding MySQL servers/ data nodes into database clustering without restarting mysql cluster

I currently have mysql clustering up and running. For high scalability is there a way to include either mysql node, data nodes, or management nodes without restarting the entire cluster. I wish to ...
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1answer
237 views

Adding MySQL servers/ data nodes into database clustering without restarting mysql cluster

I currently have mysql clustering up and running. For high scalability is there a way to include either mysql node, data nodes, or management nodes without restarting the entire cluster. I wish to ...
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0answers
593 views

Member Status: Inquorate in RHEL 5.6

I've encountered a strange issue. I had to change the time on my Linux RHEL cluster system. I've done it using the following command from the root user: date +%T -s "10:13:13" After doing this, ...
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1answer
585 views

Plesk CP with a linux cluster

I've managed to start a project where i should be implementing a linux cluster mainly for webhosting. I need to run plesk on top of that cluster in order to provide cps to customers but there seems to ...
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1answer
293 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
641 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
176 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
151 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
386 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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68 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
458 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
761 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
735 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
440 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
663 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
714 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
276 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
4k 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
3k 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
746 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
327 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
546 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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1answer
151 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
257 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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112 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
5k 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
324 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
207 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
377 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 ...
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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
110 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
220 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
1k 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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246 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
320 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 ...