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.

learn more… | top users | synonyms (1)

3
votes
1answer
341 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, ...
3
votes
1answer
362 views

How to change the Service Console subnet on an ESX cluster?

We have an existing VMware ESX 3.5 cluster (6 hosts, VI 2.5) and need to move the service consoles to a new subnet. We would like to do this without downtime for the VMs. In my previous experiments ...
3
votes
2answers
553 views

Are there high availability cluster solutions for real-time TCP streaming?

We have a server that receives some data, acting as a TCP client, processes it in some way, and serving processed data to clients, acting as a TCP server. It also stores this data on disk and can ...
3
votes
1answer
1k views

Migrating Windows 2003 File Server Cluster to Windows 2008 R2 Standalone?

We have a situation where we have an aging Windows 2003 File Server Cluster that we'd like to move to a standalone Windows Server 2008 R2 VM that resides in our Hyper-V R2 installation. We see no ...
3
votes
2answers
204 views

Sun Grid Engine Array Job Individual Resources

Is it possible in Sun Grid Engine to have array jobs where each subtask has a unique requirement? For example I may have an array job for which each task has a small unique requirement but I do not ...
3
votes
2answers
3k views

SQL 2008 R2 Clustering options

I am looking to setup SQL 2008 R2 clustering on Windows Server 2008 R2. Can someone give me some options available for installing SQL Server clustering or best practices? I thought SQL had ...
3
votes
1answer
2k views

Pitfalls to using Gluster as a home/profile directory server?

I was asking recently about options for divvying up access to file servers, as we have a NAS solution that gets fairly bogged down when our users (with giant profiles, especially) all log in nearly ...
3
votes
2answers
6k views

Cannot add second host to a Network Load Balance cluster

I am using Network Load Balancing on Windows server 2008. (Servers have two NIC's and the cluster is configured to run in unicast mode) I can configure the cluster on either of the hosts and add the ...
3
votes
0answers
367 views

Pacemaker ocf:heartbeat:IPaddr on different subnets

I'm trying to add a Pacemaker virtual IP address; with it, the gateway, and the two VMs it serves on different subnets. I've only done this before with all IPs on the same subnet, and I need some ...
3
votes
1answer
322 views

What is the proper way to shutdown an iSCSI target with connected clients?

iSCSI with two DRBD primary nodes is a bad idea to use if the two paths get concurrent write requests. But I am thinking about using this idea as backend storage for an ESXi 5.5U2 host. I already did ...
3
votes
1answer
3k views

clvmd problems during the RHEV cluster deployment

We are deploying Red Hat Enterprise Virtualization cluster and we faced a problem attempting to start clvmd service after the lvm partition creating. The following has been completed successfully: ...
3
votes
3answers
267 views

Choice of distributed filesystem for intensive reads and writes

I have a series of servers (HP ProLiant, 34 servers) each of which with 500 G of hard drive space. These servers are part of a computational cluster which runs processes that roughly fall into two ...
3
votes
1answer
130 views

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 ...
3
votes
2answers
2k views

How to set up Zabbix to monitor SQL Server Failover Active-Passive Cluster?

It should be simple, so it is just most likely my approach being totally off and someone will hopefully prod me into the right direction. We have a Zabbix 2.0.3 server instance set up monitoring a ...
3
votes
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
votes
1answer
607 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
votes
1answer
274 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 ...
3
votes
1answer
231 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
votes
1answer
955 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 ...
3
votes
3answers
1k 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 ...
2
votes
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 ...
2
votes
1answer
244 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 ...
2
votes
6answers
12k 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
votes
3answers
13k 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.
2
votes
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 ...
2
votes
2answers
140 views

Is Server Clustering Right for a 25 Person Business?

Company owner wants high availability as even a 1 hour downtime kills billable revenue for 20 accountants. I've got a one year old Dell PE T110-II running 2012 Standard and an ancient PE 840 running ...
2
votes
5answers
378 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 ...
2
votes
4answers
399 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 ...
2
votes
3answers
262 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 ...
2
votes
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 ...
2
votes
2answers
293 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 ...
2
votes
2answers
3k views

To SSD or not to SSD? (Virtualization - Xenserver) [closed]

I have several Xenserver boxes running (very well). Most of ours are setup with a RAID1 with two mechanical 7200rpm enterprise sata drives, or RAID10 with 4 7200 enterprise sata drives. The sata ...
2
votes
1answer
838 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 ...
2
votes
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 ...
2
votes
3answers
4k 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.
2
votes
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.
2
votes
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 ...
2
votes
1answer
177 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 ...
2
votes
1answer
490 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 ...
2
votes
1answer
858 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 ...
2
votes
4answers
718 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 ...
2
votes
3answers
5k views

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 ...
2
votes
3answers
245 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 ...
2
votes
2answers
85 views

Why configure cluster nodes to reboot when out of memory?

I have access to a research HPC cluster which is configured so that if your job tries to use more memory than the node has available the node crashes and automatically reboots. This appears to be ...
2
votes
2answers
812 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 ...
2
votes
2answers
5k 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 ...
2
votes
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 ...
2
votes
3answers
190 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 ...
2
votes
3answers
645 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 ...
2
votes
2answers
77 views

Nginx alternative listens

I have some Nginx servers which shares their configuration together because they are in a load balancer pool. So I have a unique configuration for all servers and all servers are listening on *:80 ...