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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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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0answers
503 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
2k views

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 ...
3
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1answer
500 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 ...
3
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1answer
262 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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1answer
213 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. ...
3
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1answer
904 views

Looking for advice on Hyper-v storage replication [closed]

I am designing a 2-host Hyper-V R2 cluster with 6-10 guests stored on a SMB iSCSI SAN device (probably Promise VessRAID). I will be getting at least two of the SAN devices and need to eliminate the ...
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3answers
995 views

SQL Server Cluster Performance

Can anybody help me answer what I hope is a really simple question? Assume I have an application running against a SQL Server database, and I am running performance tests. Should I expect improved ...
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5answers
1k views

linux clustered Filesystem

I currently have two CentOS Boxes providing NFS Services to multiple Web servers. Could someone recommand a file system which would mirror all files across both of these servers easily and ...
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6answers
10k views

How to build a single virtual machine on top of multiple computers? [duplicate]

Is there a way to run Linux operating system on a virtual machine which aggregates the resources of physical machines on the local network and acts as a single super-computer? If possible, how? ...
2
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1answer
184 views

Why Failover instead of Load Balancing for HA

From my understanding with failover clustering, only one machine is actually working, which means the other one(s) are sitting idle. So why would one use failover clustering instead of using a load ...
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3answers
12k views

Does Windows Server 2008 R2 standard edition support cluster?

I want to install sql server 2008 r2 edition in a cluster environment. Can I use Windows Server 2008 R2 Standard edition? Thanks.
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2answers
4k views

Windows 2008 R2 File Server Cluster vs. DFS

We're currently using 2 Windows 2008 R2 with DFS but discovered some issues with: replication of permissions (permissions are not replicated across DFS members) replication of quota (quota is ...
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5answers
365 views

HA Cluster having tower 4U server with SAS

I'm a little bit confused in here.. I want to have 2 node cluster with shared storage. I read all wiki page about HA cluster. Now in my head there's a scheme like: So we have two 4U tower servers ...
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4answers
396 views

Hosting Very High bandwidth sites

I have been tasked with scoping out infrastructure requirements for a site that will be pulling over 10 million plus unique visitors per month. This site will be several gigs in size content wise. I ...
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3answers
252 views

I'm thinking n+1 in a hyper-v r2 cluster managed by scvmm is not a great idea anymore

Around here the clusters (not hyper-v clusters) are typically configured as n+1, so they are asking me to create a n+1 hyper-v r2 clusters. These will configured with both csv's and live migration and ...
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2answers
1k views

Can I use ext3 as a shared fs if I add a lock manager?

I need a cluster filesystem for an iSCSI device. The problem is that the servers to which it is connected generate datafiles which must be read by every other servers. Except for the writing and ...
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2answers
59 views

Mount two nfs's shares from different storage over the same directory on linux

I have a set of 4 Linux web servers on cluster all of them have the same mount point: /folder This /folder is a NFS mount share over a NAS but is full and no more luns/disk are available to expand ...
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1answer
768 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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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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3answers
10k views

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

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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3answers
1k views

How cluster server works?

Now, I have a server running php + Mysql, but my server loading is very high, I want to start up one more server to reduce the workload, what should I do? Thank you.
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1answer
8k views

What are the pros and cons of OCFS2 and GFS2 filesystems versus NFS?

We need to set up a SAN accessible from a bunch of computers, both virtualized and real. We have an iSCSI SAN and I need to ponder some of the options. What are the differences between GFS2 and ...
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2answers
1k views

Clustering Microsoft versus Linux

Does anybody have experience with both Linux and Windows failover redundancy clusters, and if so which do you prefer for file server and/or web server? For a little background. We set up and ...
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1answer
164 views

What are the options for a HA system?

I'm looking into creating a HA Linux machine for my client's website. What are the main options I have, or a place/article where I can find out more? I would LOVE if it was a single-image, too, so ...
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1answer
333 views

Best method to share ISCSI lun across cluster of app servers

I'm in the process of migrating our cluster to new hardware. We use bare metal servers, no virtualization. Currently, we have around 30 "application" servers. When we make an update, we push the ...
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1answer
733 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 ...
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4answers
533 views

Newbie questions on MAC and high availability failovers

I am reading about High Availability and I can not understand the following I read: On failover the primary IP migrates to the backup server BUT so must the MAC address. Specifically I read that ...
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3answers
3k views

Minimum hardware requirements of a loadbalancer?

I'm going to use a FreeBSD system as a loadbalancer which routes 1gbps public traffic to back-end webserver cluster. What are the minimum hardware specs for this job? Thanks.
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3answers
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How use DNS server to create simple HA (High availability) of my website?

Welcome, How can i use DNS server to create simple HA (High availability) of website ? For example if my web-server ( for better understanding i use internal IP in real it will be other hosting ...
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3answers
243 views

MSSQL Two Database Servers 1 Database

We have two servers. They are both HP DL 380 G6 servers with the same hardware and specs running Windows Server 2008. Currently the second server is a warm standby for the first with an automatic fail ...
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3answers
1k views

Sharing SSL Certificates in a Cluster

Hopefully a very simple question, if I wanted several servers providing the same service to hold a certificate (e.g interface.internal.org) would the procedure be; Generate Public/Private Pair on ...
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2answers
688 views

why would adding a crossover private nic cause IP address resource fail?

2 node Win 2008 R2 quorum cluster Configured 192.168.0.0/24 "public network" Configured cluster MSDTC Installed SQL 2008 R2 cluster instance Manually failover groups - OK Reboot server w/o failing ...
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2answers
4k views

Farm Deployer not working in Tomcat Cluster

I have setup apache-tomcat clustering(Ubuntu Server) and I used tomcat supported clustering technique with mod_jk following the link. I've setup with One Load Balancer and Two web servers. The major ...
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2answers
2k views

How do you setup a SQL 2005 cluster in amazon EC2?

I am trying to setup a highly-available DB architecture in an EC2 servers. We are forced to use SQL 2005 for now. What kind of solutions would work in this context? Has anyone done it? I can't ...
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3answers
185 views

Maintaining software as a user (on a cluster)

Every cluster of computers I've encountered suffers from the same problem: its software is outdated. Naturally, one has the ability as a user to install everything from source in the home directory. I ...
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3answers
642 views

What issues are there installing a SQL 2008 on Win 2008 cluster?

As we all know, the cluster setup, maintenance, and underlying mechanisms have been changed extensively for SQL 2008 compared to 2005/2000. Although this fell under the Storage Engine group I was ...
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1answer
121 views

Why to use fencing when you already have redundant communication links?

This article stays that you should use both fencing (aka STONITH) and redundant communication links. I'm trying to understand what benefits STONITH gives in case of split-brain. Consider for example ...
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2answers
4k 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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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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3answers
890 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 ...
2
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1answer
280 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 ...
2
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1answer
508 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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2answers
1k 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, ...
2
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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 ...
2
votes
1answer
6k views

Tomcat Cluster Farm Deployer issue

I have setup apache-tomcat cluster with mod_jk on ubuntu server. I have some issues with FarmDeployer which deploys war files to other web servers in the cluster and I got some hope that it works as I ...
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3answers
1k views

Handling user uploads to a web server cluster

We have a number of Linux web servers behind a hardware load balancer, which serve a single website. The need has arisen for visitors to be able to upload files. The files are typically 300-700KB in ...
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2answers
3k views

What is the best way to create a failover cluster for my IIS website?

Our eCommerce website currently runs on two servers: SQL server: 2005 x 86 on Windows Server 2003 Standard x86 with a single dual core processor and 4 gb of memeory IIS server: Windows Server 2008 ...
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4answers
1k views

Cloning/copying traffic from production web cluster to test web cluster

We have 10 machine web cluster with approximately 1500 req/seq. How can we copy/clone all user traffic that comes to this production cluster in order to test new version of software, which is ...
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5answers
576 views

setting up a cluster

I have 5 PC(s) connected over a LAN through a switch. I want to connect them to form a HPC cluster. The OS may be any Linux version (currently I have installed Ubuntu 8.10, 9.10 and Fedora 10) Purpose ...