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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High availability virtual machines

I've been reading a lot about high availability virtualization, either via Hyper-V or VMWare. In that context, essentially high availability means that the VM is hosted by a cluster of physical ...
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1answer
1k views

Cannot WMI Query root\MSCluster namespace as Local Admin

I'm trying to use WMI Explorer to query the root\MSCluster namespace on various hosts to obtain cluster resource group and resource object data. I can access the namespace with no issue on Win2K3 ...
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1answer
350 views

Pacemaker corosync 2-node with a 3rd for quorum

I'm having trouble figuring out how to configure a 2-node setup with a third simpler one for quorum. It seems to think all the nodes have the capability to act as a full fallback node, when I only I ...
1
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1answer
140 views

MySQL Cluster Failover doesn't work

I have two servers, where First server 10.100.15.150: 1. one mgm server 2. one ndbd 3. one mysql api Second server 10.100.15.160: 1. one ndbd 2. one mysql api When i start all 'parts' of cluster ...
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6answers
4k views

alternative to Clusterssh for managing multiple SSH server

Is there any alternative to Clusterssh,pssh etc? to manage multiple ssh based servers through one interface? one weakness in Clusterssh is that my servers use key based authentication, with ...
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1answer
71 views

Is MySQL Clustering a viable option for a DB expecting 5TB of data in 5 years?

We plan to implement MySQL Clustering.The database should support 5 years of data and expected data/year is 1TB. When we created a test enviornment with the DB size as 200GB, NDB Cluster took more ...
2
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2answers
1k views

Performance of Cluster Shared Volume file copy from SAN

I am hoping someone can help me out with a strange issue. We are running a Microsoft Failover Cluster with Server 2008 R2 and an Equallogic PS4000 SAN. Our main configuration has 2 Dell Poweredge ...
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1answer
708 views

MySQL service does not start

My MySQL service is not starting. I am using debian wheezy as operating system in my VPS. I use MyISAM for storing tables. Response when starting service root@ipxweb1:~# service mysql start [FAIL] ...
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6answers
6k views

Cluster failover and strange gratuitous arp behavior

I am experiencing a strange Windows 2008R2 cluster related issue that is bothering me. I feel that I have come close as to what the issue is, but still don't fully understand what is happening. I ...
0
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3answers
6k views

How does one cluster multiple machines to act as one to run multiple virtual machines on this single-seeming machine?

MY question is, how does one take multiple computers and make them act as one, such that all their processors and memory are combined now and you are running any application such that yo are running ...
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0answers
698 views

MySQL Cluster msql Node Does Not Connect

I have a mysql cluster consisting of the management node, two data nodes, and a mysql node. The two data nodes connect to the manager but when I try to connect the mysql node I get the following ...
4
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2answers
466 views

Encrypted storage for clustered MySQL

I have a requirement to provide a highly available MySQL database with encryption-at-rest on a 2.6.32 linux kernel. The 'highly available' part isn't that hard, but the 'with encryption-at-rest' is ...
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2answers
73 views

startup cassandra layout

We've got a relatively low-traffic site (~1K pageviews/day) hosted on a single server, and expect it to grow significantly over the next few years. I'm thinking of moving over to Rackspace ...
0
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1answer
177 views

How can I get all resources that of a particular resource type using cluster.exe?

On a Windows failover cluster environment, we can use the command cluster resourcetype to get all available resource types. My question is, how can I get all the resources that is belong to this ...
2
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3answers
699 views

Is it possible to share the same folder name on two separate drives?

I have a Windows 2003 cluster that I'm trying to migrate to a new SAN. One of the drives that I'm copying data from has a shared folder (J:\SharedFolder) I need to copy all data from J:\ to T:\ and ...
0
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1answer
3k views

HP P2000 G3 MSA (SAS) - Configuring 2 Hosts to use the same volume (cluster)

I have got 2 x HP DL360 G7 servers with the sc08 controller cards installed, and dual controller P2000 G3, the cabling is a single cable from each server to the controlelr cards (using SAS port 1 on ...
3
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1answer
3k views

Active/Active vs Active/Passive cluster

First time setting up a clustered environment, and have a few questions. From a windows cluster perspective what determines if it is an Active/Active cluster vs an Active/Passive cluster? Is it the ...
0
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1answer
121 views

Building Windows Failover clusters, re-use quorum drives?

I'm building a series of virtual failover clusters, 2 for SQL, and 1 for BizTalk. Being that it is a Proof of concept virtual setup with no real expectations around high availability, is it possible ...
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2answers
108 views

Immortal application

(TL;DR: last paragraph) I'm running an online service and have thusfar been doing offline backups and simple monitoring to achieve resilience and availability. Resilience is rather manual but I'm ...
3
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1answer
395 views

Prevent iSCSI connection from being terminated early on reboot

I have a clustered Hyper-V environment with four nodes and three PowerVault MD3xxx storage arrays for shared storage. The servers are using standard Ethernet connections for the iSCSI fabric (not ...
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0answers
419 views

Apache httpd active/passive setup

I want to setup apache web server in active passive mode to support HTTP failover on Redhat linux 5 machine. I understand that 2 Linux boxes can be setup in HA using heartbeat or keepalived. Also, ...
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1answer
93 views

Do you know any cluster /dev/shm like interface or RAM based, cluster filesystem?

I am looking for some sort of clustered /dev/shm like device or RAM based, clustered filesystem, running on Linux, so it supports mirroring. Or there is anything stable enough which would do the job ...
2
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1answer
258 views

What makes Lustre faster and more scalable than NFS?

I have read in various places (e.g. here and here) that NFS' I/O performance does not scale, while Lustre's does, and that Lustre can deliver better I/O rates in general. There seem to be various ...
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0answers
437 views

MSSQL 2012 cluster - inactive node trying to access shared disk?

I've got an odd issue with a SQL 2012 cluster. The cluster itself uses FC shared storage, and generally works perfectly. The SQL service works, and failover occurs as expected. The issue I have is ...
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1answer
89 views

Does anybody wish to help a poor researcher publish a paper? [closed]

I don't know if this is a good place to beg for help, but here it goes: basically, I need to run a secure recommender system simulation (C++ console application) in order to meet tonight's deadline, ...
3
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1answer
243 views

What is and what is not replicated in a glassfish cluster with a mod_jk load balancer?

I have a Glassfish (3.1.2) cluster over 2 computers as nodes, with a mod_jk load balancer. Are servlet instance variables replicated perfectly? If not, how do I make sure it is? Are all actions, ...
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1answer
320 views

Hyper-V Live Migration without Cluster Shared Volume

Can someone please shed some light on this for me? I gather that it is possible to use Hyper-V live migration without the need for a Cluster Shared Volume. Given the following: Live migration can ...
3
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1answer
241 views

Are there any serverless distributed filesystems?

Similar to Is there a Distributed SAN/Storage System out there? or Distributed redundant storage solution?, except with a couple key differences (and two years newer). Context: I have a small Rocks ...
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2answers
42 views

using multiple schemes in a clustered sql server 2008 Database

I have a SQL server 2008 R2 database with 2 schemas, i need to enhance the performance of the server so we plan to cluster the DB, we will have 2 nodes . is it possible to separate each scheme so each ...
2
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1answer
3k views

IP failover with 2 nodes on different subnet: cannot ping virtual IP from second node?

I'm going to setup redundant failover Redmine: another instance was installed on the second server without problem MySQL (running on the same machine with Redmine) was configured as master-master ...
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1answer
343 views

SBD killing both cluster nodes when there are even small SAN network problems

I am having problems with stonith SBD in a openais-based cluster. Some background: The active/passive cluster has two nodes, node1 and node2. They are configured to provide an NFS service to users. ...
0
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1answer
225 views

NAS server freezes in cluster environment using NFS

In our department we have an Iomega NAS (px4-300d) connected to a Supermicro cluster with 5 nodes (12 cores per node). Each node mounts a share on that NAS by using NFS. Unfortunately after some time ...
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1answer
620 views

VMware shared storage cluster isn't visible on all hosts

I have a trial Vcenter 5 + 2 esx 5, all still in trial period, meaning I have all features enabled. I have created a LUN on my QNAP NAS, and added it as a cluster datastorage on my vcenter however, ...
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1answer
503 views

What's the right way to shutdown a SQL Server 2008 R2 cluster?

I'm new to SQL Server 2008 R2 cluster. I just created a test environment now I need to shut it down. I know SQL Server cluster is a high availability solution so there is seldom mentioned that how to ...
4
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1answer
1k views

SQL Server 2008 R2 cluster, “available storage” shows “offline”

I've installed a SQL Server 2008 R2 cluster and I found the resource group "available storage" shows "offline" status. What does it mean? It seems I can't take it online. I tried to use the cluster ...
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1answer
146 views

SQL Server 2008 R2 cluster installation, can I install on the 2 nodes at the same time?

I've configured the Windows cluster, now I need to install SQL Server on the 2 nodes. To save time, I want to know if I can install on the 2 nodes at the same time? Thanks
0
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2answers
136 views

load balanced server farm in php with sql

What is the best configuration for a load balanced server farm for a high demand download web page that uses php and mysql. I have servers that currently use centos with lightppd. Has anyone got ...
4
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1answer
535 views

Pacemaker/corosync timeout before resource transfers

This seems like a simple question, but one I can't seem to find the answer for despite going over the pacemaker documentation multiple times. I've got corosync set up with pacemaker to share a ...
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2answers
93 views

Distributed mysql synching

I'm running a server which is connected to an SQL host. I have an another server and I decided to run it as an SQL backup. So, I have 3 of them. Srv A is the SQL host, srv B is the backup. I know ...
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0answers
374 views

Windows 2003 cluster: One node offline causes the cluster service on the other node to fail

I configured a 2 node cluster on 2 Windows 2003 machines with Exchange 2003 The resources: Majority node set Data volume Cluster IP Cluster network name Exchange 2003 system attendant (and all ...
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3answers
707 views

How to failover to another web service automatically?

I've got a 3rd party off-the-shelf windows application that needs to connect to a Web Service (IP address or URL) installed onto another server (actually running on Windows 7 Professional). My user ...
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3answers
71 views

Building right system for my needs [closed]

I will be providing "File-Hosting" service and I need something that works with me along the line and allow the project to expand. At first I was thinking about one big server with RAID 5 as a ...
1
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0answers
746 views

Fence device for RHEL cluster node on vmware workstation

I have a host with Windows 7. I installed VMware Workstation where I have installed two virtual machines. Each virtual machine is a rhel 6.2 node running clustersuite. Do you know which fence device ...
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0answers
218 views

Set total memory limit with Torque

I run a moderately sized cluster and I am having a queue problem. For example I have a node with 128GB of memory and a program that I set the amount of memory per core. So for example if I set memory ...
2
votes
3answers
204 views

Storage cluster for inexperienced admin

I'm a relatively inexperienced server admin who primarily works with Windows and a little bit of Linux. I'm the only admin of a small organization. I'm looking for a way to have a high-availability ...
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1answer
198 views

Howto restart a MySQL MMM cluster

little theoretical question. I'm done setting up a bunch of 2-node MySQL 5.1 clusters user the control of several MMM instances. We started some testing, joyously kill -9 the writer nodes and all ...
0
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2answers
287 views

wall command + broadcast message not appears on second cluster machine

I have two cluster solaris machine ( machine1 , machine2 ) I have connection between two machines ping and ssh work fine ( cluster is fine ) more /var/tmp/mesg TEST I execute the following ...
0
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1answer
263 views

Utilising a Magento server cluster to drive hot reindexing

We've asked a similar question in the past, basically we have a very large Magento store with 500000 products which are currently reindexed once a day, during the night. We'd like to speed this ...
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1answer
131 views

Hyper-V Manager/Server failover/redirections

I have currently one Hyper-V Server 2008 R2 server installed, it's successfully running 4 VM's, but memory/RAM is starting to become sparse. I actually have a 2nd machine available, so my great idea ...
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1answer
813 views

How do you configure Pacemaker to mount the DRBD data directory on the slave?

how do you get the Slave node of a DRBD pair to mount the data directory so data can be sync'd? I went through the following guide: https://wiki.edubuntu.org/ClusterStack/Natty#Prepare_Partitions to ...