High availability is an architectural consideration often involving degrees of redundancy to insure availability in case of system or component failure.

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after split brain recovery filesystem not mounted

I have an active/passive high availability cluster with pacemaker+split brain. After split brain condition I use automatic split-brain recovery to recover my systems. The problem is that since file ...
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1answer
459 views

Setup HA postgres database, failover concept

I want to setup a HA postgres database. I setup master and slave database with synchronous streaming replication on different physical servers. When there is an error in the replication, the slave db ...
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1answer
2k views

How to setup a simple Ubuntu Server Tomcat cluster on VirtualBox for testing? [closed]

I am looking for the step by step instructions to setup at least two simple Ubuntu Virtual Core 12.10 Server VMs on Oracle VirtualBox under Windows 7 64bit. The test setup would be: Apache HTTP ...
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5answers
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When my A web server gets unplugged, how do I automatically redirect all the users to my B web server in another city, and vice versa?

When my A web server gets unplugged, how do I automatically redirect all the users to my B web server in another city, and vice versa? A load-balancing switch does what I want, except I can't figure ...
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1answer
254 views

MySQL High Availability with VMWare/DRBD/Heartbeat still common practice?

Is it still common practice to use a DRBD/Heartbeat solution for a high available MySQL Instance when the whole environment is virtualized (in our Case VMWare) Are there other/better solutions out ...
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2answers
424 views

Clustered file systems as XenServer storage

I want to use shared storage for a XenServer environment with 4 host servers which are running various VMs under XenServer. Planning to use 2 extra servers as storage with high availability of some ...
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1answer
723 views

Load balancing with High Availability - SQL Server + IIS using AWS

This is my first time load-balancing with high-availability using Windows and SQL Server. Looking for some validation and input on my planned setup. Now, typically when I want to create a HA ...
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0answers
72 views

Solaris and Hot-Standby

i have a short question. is it possible to create a hot-standby-cluster with 2 nodes and solaris 10? in Linux i would use DRBD and Hearbeat/corosync, but in Solaris? maybe do you have an tutorial? ...
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1answer
271 views

Virtual IP Failover when machine is overloaded

We have been using keepalived in combination with a virtual IP address for two years now. In the rare case that a machine crashes this works very well. But when there are issues on the box itself we ...
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1answer
675 views

Using LVS (Linux Virtual Server) for doing DNS HA

I have been trying to create an LVS DNS HA using CentOS 6.x: Piranha GUI to configure the DNS Pulse is the HA heart of CentOS LB IPTables to configure marks on the packets since DNS uses TCP and UDP ...
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1answer
50 views

Backing up a mirrored SQL environment

I have 2 SQL servers in Mirror configuration. I want to backup these servers but backing up the SQL databases in Mirror state causes an error. These two mirrors also have a witness set. I would ...
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1answer
95 views

lvsd config correct?

I have used Piranha to setup fail-over for httpd. I set the servers the same, but one shows the VIPS and the other doesn't. Is this normal? Server A) [Primary] [root@titania ~]# ipvsadm -L IP ...
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0answers
586 views

Exchange 2010 DAG Failover Cluster DNS Issues

I am having an issues with my Exchange 2010 servers. I have two servers that have HUB/CAS/MAILBOX installed on them. They are configured to use DAG failover cluster. I expereienced an issue recently ...
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6answers
303 views

Should HA hardware be in separate cabinets?

I want to host (co-located) a service at a Pier1, Q9 or some similar hosting facility. Is it best practice to put my failover hardware in separate cabinets, and in your experience, will the hosting ...
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0answers
203 views

Unable to remote desktop using failover cluster name

I am using Microsoft Failover Cluster and I have 2 nodes - say node1 & node2. The nodes are successfully accessed by remote desktop. but the cluster name is not accessible. The cluster name is ...
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2answers
3k views

Avoiding SPOFS with GlusterFS and Windows

We have a GlusterFS cluster we use for our processing function. We want to get Windows integrated into it, but are having some trouble figuring out how to avoid the single-point-of-failure that is a ...
5
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1answer
625 views

VMware vSphere DRS affinity rules for more than 2 guests

I've received a request to add disaffinity/anti-affinity rules on a set of virtual machines in a VMware HA/DRS cluster running VMware vSphere 4.1. The client has four hosts and wants to keep certain ...
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1answer
288 views

Advantage of Microsoft Cluster over Microsoft Network Load Balancer

Till recently, I assumed that Microsoft NLB worked at an OS/Machine level rather than an Application Level. i.e. the NLB just monitors heartbeats on the machine to check if machine is alive and then ...
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6answers
1k views

Real HA/FT SAN for VMware?

I'm planning a redundant set-up for VMware. Two locations (about 8-12km distance) are to be connected with dark fibre for SAN connectivity. I am looking for a FC-SAN product that allows transparent ...
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1answer
201 views

Addressing SQL 2008 mirror cluster

Hallo SQL jedis, I want my database to be always available. So I've set up database mirroring, which is working peachy. My question though, is how can I consistently address the database? I want ...
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1answer
72 views

Highavailability/Global Loadbalancing of clusters [closed]

I know this website 1channel.ch which has like 4 servers in 4 different datacenters across the globe (czech republic, estonia, sweden, germany). What happens is as i am browsing this website the ...
0
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1answer
167 views

Using Amazon route53 for high availability

Using Amazon Route53 DNS, is it possible to build a highly available setup pointing to multiple web servers not on Amazon? I don't need to worry about session stickyness. Let's assume I have two web ...
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1answer
181 views

HA Options for Windows Servers

We are looking at different options to allow us to stay up and running when our primary datacenter (DC1) goes down for any reason. What is the main difference in having a offsite server updated all ...
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1answer
235 views

How to setup a failover solution for Windows 2003 SMTP Server?

I'm currently running Windows SMTP Server on a rented Windows 2003 Server VM. There are times when my hosting company network is down and my clients can't send their emails via the SMTP Server host I ...
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2answers
492 views

hosting a website on multiple hosts

Is there a way to host a website on multiple hosts. exactly the same site, for example on hosting companies HostingABC and HostingDEF? In case there is ever a problem with HostingABC (either a ...
2
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1answer
614 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
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1answer
443 views

Linux HA Heartbeat Virtual IP Switching with domain name linked to it

I have heartbeat set up on two servers like so: Master: 10.15.1.50 Backup: 10.15.1.51 (Virtual IP: 10.15.1.52) So, the master always has 10.15.1.52 as well, but if it goes down, the backup will ...
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1answer
256 views

Can HAProxy load balance a remote site, while the server it runs on hosts another?

Bit of an odd question, and I know it's not ideal, but still..... I currently have a virtual machine that acts as a web server using Apache. This hosts a couple of different sites, with that being ...
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1answer
3k views

mount.ocfs2: Transport endpoint is not connected while mounting…?

I have replaced a dead node that was running in dual-primary mode with OCFS2. All the steps work: /proc/drbd version: 8.3.13 (api:88/proto:86-96) GIT-hash: 83ca112086600faacab2f157bc5a9324f7bd7f77 ...
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3answers
769 views

HAProxy NGInx SSL setup

I've been looking around different setups for a server cluster supporting SSL and I would like to benchmark my idea with you. Requirements: All servers in the cluster should be under the same full ...
3
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3answers
1k views

What is the correct way to remediate an HA Cluster?

Background / Goal I have a VMWare HA cluster for production Machines with two hosts. It is currently set up so that it can account for the failure of up to one host. It does not use DRS. I need to ...
6
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2answers
3k views

How to do client side NFS failover in Linux?

I have a CentOS 6.3 client that needs to access NFS storage. There are two NFS servers that serve up the same content stored on a SAN with a clustered filesystem. How do I set up CentOS to failover ...
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0answers
229 views

How to setup Wordpress High Availability

I have installed Galera Cluster on 3 cluster + 1 management. I wanted to make it like this, Server1: Home (www.domain.com) Server2: For BBpress/Forum (Forum Tab Menu will forward to ...
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4answers
1k views

VMware Virtual vCenter and High Availability

To continue with this question: Should be Vmware vCenter server high available? According to the response there even if vCenter is down HA will continue to work. So, if my vCenter is a VM, using ...
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1answer
87 views

Choosing a database management system to maximize availability and scalability [closed]

If I was planning on choosing a database management system and know that the data needs to be available as close to 100% as possible and that it needs to scale as well as possible, is there a "best" ...
0
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1answer
246 views

HAProxy MySQL Failover is not starting

I am trying to setup HAProxy with MySQL failover with Ubuntu. I used a setup similar to this serverfault question, however I am getting the following error when starting haproxy: [ALERT] 341/220001 ...
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1answer
74 views

How to manage SOAP requests to a pool of VM each listening on a HTTP port with a priority value in these requests?

I have a front SOAP web-server under Linux. It will have to communicate with Windows Servers VM listening each on a HTTP port, for a HTTP POST request. The chosen VM should return a report of a task ...
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2answers
67 views

Is a virtual IP assigned by a hosting provider?

I'm going to be setting up HA proxy with 2 physical servers, using heartbeatd. I'm going to have clients point domains to an IP address which can't change after doing so. My hosting provider has ...
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1answer
103 views

Relying on shared disks for heartbeat

I read somewhere that using shared disks for heartbeats is reliable even if network totally fails. I read it in the context of remedy from split-brain. Is this correct? But I can not understand this. ...
5
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2answers
4k views

High-availability on SQL Server, cons and pros of solutions?

I'm studying about high-availability on SQL Server for my thesis. I've learned there're several solutions to archive this: Failover clustering Log shipping Replication As I know, these solutions ...
2
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1answer
179 views

VPS hosting with IP failover across datacenters

Is there any VPS hosting that would allow IP failover (or remapping) across different datacenters ? The only one I aware of is EC2 with their Elastic IP. What I'm trying to achieve is to have servers ...
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2answers
445 views

How to configure HA iSCSI for Solaris 10

BACKGROUND: We have a StarWind NAS that we are currently using for High Availability storage with our Windows network. Starwind has mirrored drives and multiple ip paths, that the Windows Server ...
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2answers
650 views

HAProxy — pause/queue all traffic without losing requests

I basically have the same problem as mentioned in this thread -- I would like to temporarily suspend all requests to all servers of a certain backend, so that I can upgrade the backend and the ...
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2answers
3k views

Options for Multisite High Availability with Puppet

I maintain two datacenters, and as more of our important infrastructure starts to get controlled via puppet, it is important the the puppet master work at the second site should our primary site fail. ...
2
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2answers
80 views

Suggestions on providing HA access to an external (fibre) RAID subsystem

We are looking at upgrading our storage capacity with an external RAID subsystem that has redundant (2) fibre controllers, each controller has 4 x 8 Gbps fibre ports. I would like to make access to ...
5
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4answers
2k views

Providing high availability and failover using MySQL on EC2

I would like to have a highly-available MySQL system, with automatic failover, running on Amazon EC2 instances. The standard approach to solving this is problem Heartbeat + DRBD, but I've found a lot ...
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3answers
268 views

Software for failover across multiple external hosts

I have multiple webservers with the same content, hosted across different providers. However, I can't seem to find a nice, simple failover solution. Load-balancing software (Pound, HAProxy, etc.) are ...
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2answers
239 views

Is this a solid (and cheap) High Availability idea for my website and database if the zombi's attack?

I have an Idea for fail-over high availability for my website but i am not sure if this is good, bad or a disaster in itself. My main server hosts an ASP.net website that uses a SQL server database ...
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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 ...
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2answers
434 views

High Availability without IP Failover?

Are there strategies or techniques to create HA environment when IP failover isn't available? I'm reading a guide at Linode's library which describes exactly what I want to do, but I'm not sure my ...