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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Hyper-V virtual machine can't be migrated to a specific host in the cluster

I have a three-node Hyper-V cluster running on Windows Server 2008 R2 which is working quite flawlessly: there are no errors, live migration works, all hosts can and will happily run all virtual ...
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1answer
129 views

ScaleMP vs SAS Grid

At my workplace we have a heavily used SAS server, but its workload is such that obtaining 1 minute of CPU time often takes 10 minutes of real time. This isn't just due to an I/O or network bottleneck ...
2
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1answer
987 views

Postifix SMTP Load Balance

I want to load balance outbound emails between 3 post-fix gateways for sending mails only reason is to use multiple different source IPs to increase throughput & inbox delivery. Each gateway ...
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1answer
644 views

SGE Auto configured consumable resource?

I am using a tool called starcluster http://star.mit.edu/cluster to boot up an SGE configured cluster in the amazon cloud. The problem is that it doesn't seem to be configured with any pre-set ...
2
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1answer
677 views

How to set up alerts on Ganglia?

How can I set up Ganglia so that I get an email if a machine in the cluster is using, for example, greater than 95% of physical RAM?
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1answer
4k views

JBoss 7.1.1 Clustering, JBAS014775:New missing/unsatisfied dependencies

I am following https://docs.jboss.org/author/display/AS71/AS7+Cluster+Howto I managed to get 2 servers running. One slave. One master. I managed to get to "Dry Run" I got: [Host Controller] ...
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1answer
350 views

Can Windows cluster failover a custom TCP Server application even when Windows itself is working?

I develop a TCP server application that listens to a specific port. One of my users is asking me if my application can run on an active-active Windows 2008 Enterprise cluster. Having only almost no ...
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2answers
1k views

Windows Server 2012: Possible to have High Availability and reliability without needing a SAN, but connecting servers together?

I have some questions below -- tried to word them the best I could. If you downvote my post, please make a comment explaining why you downvoted so that I can try to do better when I post in the ...
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1answer
556 views

Mysql migrate huge db from innodb to ndbcluster Err: the table is full

I'm trying to migrate old database to mysql cluster (4 data nodes) by using command: ALTER TABLE sample ENGINE=NDBCLUSTER but I'm getting the following error: The table '#sql-7ff3_3' is full ...
2
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1answer
206 views

Tomcat 7 Clustering using IIS webserver

I successfully configured Apche httpd server for load balancing and clustering od multiple tomcat instances on same machine. Now I need to use IIS web server instead of Apache server. How can I ...
4
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1answer
184 views

How does a SQL Server Availability Group decide on which secondary will become the new primary when an automatic failover is triggered?

How does a SQL Server Availability Group with multiple synchronous-commit secondary replicas decide on which secondary replica will become the new primary when an automatic failover is triggered? ...
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1answer
212 views

What is the differences between a Remote File Share Witness Quorum and a Disk Witness Quorum?

Say you set up a Windows Server Failover Cluster consisting of two nodes, on Windows Server 2008 R2 Enterprise. Now when you want to configure quorum you can use either a remote shared folder, or a ...
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1answer
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How do I network this Windows Failover Cluster and MongoDB Replica Set? (diagram inside)

As you can see, my two Windows Server Failover Cluster (WSFC) nodes have three network interfaces each, which connects them to three different networks : A public network A private network ...
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1answer
80 views

SQL Server 2008 instance's listening on mulitple ports on a cluster [closed]

I have three SQL Server 2008 instances running on a cluster. SQLInstance1 is listening on default port 1433, SQLInstance2 is listening on port 39999 and SQLInstance3 is listening on port 49999. Can ...
2
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1answer
223 views

Should a SQL Server tempDB partition be shared by the cluster?

We have a 2-node SQL Server 2008 RS cluster. The data and log partitions are shared among the cluster nodes. Does the tempDB partition need to be shared as well, or will local server node storage ...
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3answers
101 views

Clustering a web server

With 4 servers with OpenSuse is it possible to cluster them all together to run websites? What is involved in clustering and is anything special needed to cluster the machines together so they work as ...
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2answers
3k views

Alternative to GlusterFS [closed]

I need to create a redunant 2-linux machines configuration so that the files on server1:/dir are in sync with the files on server2:/dir I managed to configure GlusterFs to do this but while it works ...
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1answer
1k views

Tomcat 7.0 Clustering FarmWarDeployer Not working

I'm currently working on a Tomcat Cluster for Q&A, but unfortunatly, it seems that the auto deploy of a war across this cluster is not working at all. I know the cluster is working perfectly ...
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2answers
4k views

How to make a DHCP server on virtual machine serves other virtual machines(on different physical machines)?

I'm building a virtual cluster with VirtualBox and Opensuse. I have 10 physical machines and need several vms on each. The virtual machines are supposed to be in a "private" network, but still have ...
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2answers
244 views

Server Clustering on differen OS : CentOs and Debian [closed]

I have two dedicated servers in two different locations. One at USA (Based on CentOS), another at Asia (Based on Debian). Need to implement High Availability HTTP Clustering. The main complexity is ...
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0answers
70 views

trying to understand network layer(s) in WebAPI server cluster [duplicate]

I'm in the process of building my first webAPI server cluster. The webAPI hosted by this cluster provides a hi-comute resource, where each task request requires between 0.5 and 1.0 seconds of CPU ...
0
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1answer
235 views

Sphinx search on RHEL / CentOS MySQL cluster

Is it possible to add a new resource type to an RHEL or CentOS 6.x cluster, in order to allow Sphinx fulltext search to run alongside MySQL? The clusters are managed using luci/ricci and cman.
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2answers
1k views

csync2 ERROR: Connection to remote host failed

I was unable to find any articles to answer this question, so my best bet was to post this here: Scenario We have 2x application servers in production hosting a PHP website and I would like some ...
6
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7answers
474 views

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
359 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 ...
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1answer
147 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
77 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
724 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
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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 ...
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3answers
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How does one cluster multiple machines to act as one to run multiple virtual machines on this single-seeming machine?

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 them on a single ...
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2answers
513 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
74 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
208 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
735 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
4k 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
123 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 ...
0
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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
votes
1answer
438 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
457 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
votes
1answer
262 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
450 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
90 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
259 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
345 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
251 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 ...