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.
23
votes
15answers
17k views
Cheapest iSCSI SAN for Windows 2008/SQL Server clustering?
Are there any production-quality iSCSI SANs suitable for use with Windows Server 2008/SQL Server for failover clustering?
So far, I've only seen Dell's MD3000i, and HP's MSA 2000 (2012i), which both ...
20
votes
4answers
4k views
How can I pre-sign puppet certificates?
Puppet requires certificates between the client (puppet) being managed and the server (puppetmaster). You can run manually on the client and then go onto the server to sign the certificate, but how do ...
8
votes
6answers
3k views
Best way to load balance across multiple static file servers for even an bandwidth distribution?
First off, I'll explain my situation to you. I'm running a fairly popular website as a side project, so I can't really invest a ton of money into it. I currently have just one server with HAProxy in ...
7
votes
4answers
2k views
Load balancing and HTTPS strategies
I am faced with the following problem: Servers get saturated since current load balancing strategy is based on client IP. Some corporate clients access our servers from behind large proxies so all ...
6
votes
2answers
490 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 ...
6
votes
9answers
555 views
Is it possible to create a faster computer from many computers?
My post below was (I think rather unfairly) closed on StackOverflow hence my reposting here.
Original Question: How can I use several computers to create a faster environment? I have about 12 ...
6
votes
3answers
323 views
Is Clustering really = High Availability?
These days clustering is becoming synonymous to high availability. As an enterprise architect I have to shake my head in disbelief. IMHO, clustering can be a component of HA but is far from being HA ...
6
votes
7answers
1k views
How can I shut down (power off) cluster nodes during low load?
I'm developing software for the energy consulting business and in monitoring energy use in datacenters, I've noticed that the typical electric load "pattern" of a datacenter is just a flat line, ...
6
votes
3answers
8k views
nginx automatic failover load balancing
I'm using nginx and NginxHttpUpstreamModule for loadbalancing. My config is very simple:
upstream lb {
server 127.0.0.1:8081;
server 127.0.0.1:8082;
}
server {
listen 89;
...
6
votes
3answers
2k views
Maintenance plan for SQL Server Database Mirroring
We're using SQL Server database mirroring and we're trying to create a db maintenance plan to backup the database. The problem is that when the server is not the primary database the plan fails. I was ...
6
votes
2answers
534 views
Are ZFS clustered filesystems possible?
Is it possible to create a ZFS cluster? Or would you need to go the seemingly ugly (to me at least) route of ZFS with UFS formatted pools governed by GlusterFS?
The idea is to see if it is possible ...
5
votes
7answers
426 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 ...
5
votes
5answers
950 views
Clustering F5 Big-IP Devices; Is it Possible?
I developed a web application. It will run on a farm of five IIS servers. It's absolutely essential that once a session is established with a server in the farm, further HTTP requests within that ...
5
votes
3answers
278 views
What is your provisioning method? (out of the cardboard -> bare metal -> fully functional server)?
Trying to cut down our deploy times and looking for suggestions and shortcuts you or your team uses to get back in the terminal and out of the data center. Looking at the entire process from ordering ...
5
votes
8answers
1k views
Linux stretch cluster: MD replication, DRBD or Veritas?
For the moment there's a lot of choices for setting up a Linux cluster.
For cluster manager: you can use Red Hat Cluster manager, Pacemaker or Veritas Cluster Server.
The first one has the most ...
5
votes
3answers
2k views
High Availability for SSL Web Site
One of our web server clusters serves a moderate number of busy e-commerce applications. At present, each site lives on a specific web server and has a hot-spare copy mirrored to another web server ...
5
votes
3answers
527 views
SQL Server clustering options
Can anyone give an high-level overview of the options available for SQL Server clustering, their pros and cons?
Is it better to use Microsoft Clustering services or SQL Server native clustering? Does ...
4
votes
3answers
498 views
Cheap clustering for SQL server
Does anyone know of a way to simulate a clustered SQL server solution? We obviously don't want to spend a lot of money prototyping the idea, but we have quite a few PCs available. I was just wondering ...
4
votes
2answers
358 views
Filesystem redundancy + speed
Looking for some input and if anyone has conquered this problem with a solution they feel confident about.
Looking to setup a fault tolerant web environment. So the setup is a few nodes behind a ...
4
votes
3answers
289 views
SQL Server 2008 Fail-over Cluster
I am using SQL Server 2008 Enterprise and I want to install SQL Server 2008 fail-over Cluster. I am wondering,
(1) do I need an active directory domain?
(2) what is the minimal number of machines do ...
4
votes
2answers
3k 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 ...
4
votes
4answers
499 views
MySQL Clustering
I run a mysql server that hosts around 50Gb of data (primarily for around 250 websites), and am wondering what my options are for setting up a redundant MySQL cluster? The primary purpose would be ...
4
votes
3answers
213 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 ...
4
votes
1answer
186 views
Linux Filesystem options for iSCSI shared storage
I am trying to determine my 'best choice' for a filesystem to use for a shared storage device that will be mounted via iSCSI across an indeterminate number of servers.
Setup:
27TB Synology RS2212+ ...
4
votes
2answers
578 views
Triggering a failover in a windows failover cluster?
In lieu of making an application cluster aware is it possible to set up a trigger based on an event appearing in the system event log to cause the server cluster to failover?
4
votes
2answers
171 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 ...
4
votes
1answer
393 views
Recommendations for distributed processing/distributed storage systems
At my organization we have a processing and storage system spread across two dozen linux machines that handles over a petabyte of data. The system right now is very ad-hoc; processing automation and ...
4
votes
3answers
2k views
Clustering IIS and SQL Server
I have a WCF service deployed on IIS and using SQL Server 2008 as backend.
My Question is how can I make cluster(load-balance/fail-over) on IIS and on SQL Server and what sort of thing i need to ...
4
votes
1answer
134 views
What are good options to cluster file servers?
We have a NAS with relatively slow disks that is choking when users are logging in in the morning. We're migrating user home directories and profiles to a newer, faster server, but I was wondering if ...
4
votes
2answers
219 views
MySQL Clustering and replication
I want to setup a MySQL cluster setup of two servers (M1-M2). I also want to setup MySQL replication between two servers (M1-M3).
Is it possible to setup both clustering and replication as above. Is ...
3
votes
4answers
2k views
Load balanced Drupal servers: a good way to share data among the servers?
I'm trying to get an overview of how i would go about creating a load balanced web server setup. Setting up the actual load balancer and adding two or more web servers seems fair enough. However, I ...
3
votes
3answers
2k 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, ...
3
votes
3answers
12k views
How can I fix a bad arp entry?
I'm just guessing that arp is my problem...
I have a linux drbd server cluster set up, and due to some power issues had to unplug the switch that connects the two servers. As a result, both servers ...
3
votes
4answers
456 views
Medium office fileserver: One professional server or multiple cheaper servers in cluster?
What would you recommend for a medium office fileserver? By medium office I mean roughly 100-150 users that connect to the fileserver sporadically during the day. We're talking about 2TB of data and ...
3
votes
5answers
3k views
Disable fencing in RedHat Cluster?
Whilst I'm developing with RedHat Cluster, I'd like to be able to disable fencing completely. The documentation for this stuff is fairly lacking - can I do this at all, or should I be looking to fake ...
3
votes
1answer
190 views
Active directory (AD) best-practice for clustering
We want to use AD as a regular LDAP for storing and accessing our application data in fast and reliable way. We have two physical server and want to organize some sort of clustering for AD and its ...
3
votes
4answers
1k views
SQL Cluster on Hyper V Failover Cluster
We have a VM running SQL Server on a 6 node cluster of blades. The VM's data files are stored a SAN attached using a direct iSCSI connection.
As this SQL server will be running a number of important ...
3
votes
7answers
188 views
Software for Utilizing Idle Workstations on Network
I work at a company that maintains a network of about 200 Windows XP workstations, and several of them are on (locked or logged out) with an idle processor and 2GB of RAM that is just sitting there. ...
3
votes
2answers
53 views
Are there cluster resource schedulers abstraction layers?
I'm writing an application that could potentially be run on any cluster resource scheduler (SGE, LSF or SLURM to name a few of them), using very basic functionalities.
I'm wondering if a ...
3
votes
1answer
330 views
SQL Server 2008 R2 100% availability
Is there any way to provide 100% uptime on SQL Server 2008 R2?
From my experience, the downtimes for the different replication methods are:
Log Shipping: Lots (for DR only)
Mirroring w. NLB: ~ 45 ...
3
votes
2answers
911 views
Hardware Requirements of SQL Server Clustering
My task is to do clustering in SQL Server 2008. What are the hardware requirements for windows clustering? Is either SCSI or SAN compulsory, or is shared disk enough? I can't understand the hardware ...
3
votes
3answers
584 views
Clustering/load balancing for cluster unaware applications
Forgive me if I use any of these terms incorrectly.
I am wondering if there is any kind of software that would allow my two "join" two computers together such that a cluster unaware application could ...
3
votes
1answer
627 views
Display or install Windows product key on command line
We are currently in the process of setting up several Windows HPC clusters using Windows 2008 HPC R2. We would like to be able to perform Windows licensing commands across the clusters via the ...
3
votes
6answers
1k views
SQL Clustering on Hyper V - is a cluster within a cluster a benefit
This is a re-hash of a question I asked a while back - after a consultant has come in firing ideas in to other teams in the department the whole issue has been raised again hence I'm looking for more ...
3
votes
1answer
441 views
What applications can be used in a Red Hat/CentOS cluster?
When I look at the Red Hat cluster manuals 1 2, they only explain how to install it but not what applications can use it. I am new to clusters, so I don't know these things =)
Let's say I want to 3 ...
3
votes
4answers
2k views
Ubuntu Clustered KVM's
I'd like to set up three virtualized server on one box running Ubuntu KVM. I'd also like to have a second machine mirroring the above mentioned on a cluster so that if the first machine physically ...
3
votes
2answers
1k views
Alternative to GlusterFS
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 ...
3
votes
4answers
540 views
Multiple servers acting like a single one with all the hardware?
by now I have 10 servers for hpc, power computing oriented.
My users need to launch several processes using qmake.
The users are used to work with ubuntu 9.10, and the software from the repositories ...
3
votes
1answer
973 views
Are there problems teaming the public network adapters on a Windows Server 2008 R2 failover cluster?
We have a two-node Windows Server 2008 R2 fail-over cluster that's hosting about a dozen instances of SQL Server. The nodes each have four network adapters in them (a pair of dual-port Broadcom ...
3
votes
2answers
269 views
Gotchas when building a Beowulf Cluster [closed]
I am creating a beowulf cluster on a very limited budget which will be used to simulate fluid flow problems. I have never created a beowulf cluster before and am looking for suggestions and gotchas ...
