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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Windows 2012 R2 Cluster

This is my first time building a Failover Cluster. I run the validation and every time I get the following. "Failed to prepare storage for testing on node {SERVER NAME}: The remote procedure call ...
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22 views

Could HAProxy disable the Apache Instance on the same node it is running?

I have a setup with three VMs that are running on a core i74xx. The machines form a LAMP cluster with HAProxy doing the loadbalancing. After running multiple load tests I found out, that throughput ...
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1answer
13 views

How to sync clock and UIDs across different nodes of a cluster with Ubuntu?

I am new to cluster computing and Ubuntu. We have a computing cluster with 4 nodes (10 cores per node) with Ubuntu installed. The cluster is meant for scientific computing. To install a load ...
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22 views

Pool of machines without authentication?

I am working on a cluster of linux machines. What I need is for authentication to not be needed between the machines in this cluster, but required from outside. I have considered the idea of setting ...
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23 views

replacing eth1 for wifi ROCKS cluster [on hold]

the room where I will be setting up my rocks cluster does not have a ethernet port available, but there is private wifi that I can use. My question is can I use wifi instead of an ethernet connection ...
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18 views

File system size different from LV size

I try to build a highly available Red Hat 6.6 cluster. Following is the procedure I followed to create each of 6 shared gfs2 file systems: I first created physical volumes using multipath friendly ...
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25 views

RedHat Cluster 6 node won't see shared volume group

I try to create a shared clvm volume group shared between 2 nodes of a Red Hat Cluster 6. Here is the procedure I followed: [root@node1 ~]# pvcreate /dev/mapper/mpathab [root@node1 ~]# vgcreate -c y ...
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33 views

Simultaneous server crash in fail over cluster

I have 2 servers in a failover cluster. The cluster defines a shared 'ClusterStorage' drive. The drive maps to a SAN device through iScsi. Recently, the 2 servers rebooted on their own at the same ...
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57 views

how to do automatic failover of mysql / galera cluster

I have two mysql/galera clusters of three nodes each (two + garb node). The clusters are in separate DC's (dc1 and dc2) The cross cluster replication happens between node1-dc1 and node1-dc2 I want ...
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12 views

Ceph remain in HEALTH_WARN after osd remove

I have a cluster of 3 servers with cepth storage over 9 disks (3 each server). One osd is going down/out and so I "remove" it, after that system start to rebalance data over the remainig osd but after ...
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3answers
49 views

Can we build a Hyper V failover cluster without a SAN or other shared storage?

I have a question about Hyper-V Failover Cluster. I have 2 server Hyper-V and want to use a failover cluster. As far as I know, I need a SAN server for that, so do we need it in here?
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16 views

Keepalived in the AWS autoscalling group

I want to deploy Keepalived in the AWS autoscalling group. The issue that Keepalived need to know ip address of the each node in the cluster, that is difficult in the elastic environment, where we ...
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2answers
53 views

pcs status error httpd_monitor_5000 on server 'not running' (7):

Error Message Failed actions: httpd_monitor_5000 on abc-zabserver-b 'not running' (7): call=65, status=complete, last-rc-change='Wed Jul 15 21:44:43 2015', queued=0ms, exec=8ms pcs status ...
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37 views

Windows Cluster An error was encountered while determining shared storage

Our SAN manager has added a new disk for our cluster. this is a new 6TB disk that will be used for backup and will be part of a file share. I have put the disk online, initialized it and assigned the ...
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16 views

Is it possible to create NUMA cluster containing 2-3x Dell / HP servers for SQL Server 2008 R2?

I want to create cluster of servers working at the same time on 1 query. Currently my server for some queries is providing unacceptable result time (server is providing data to the request for my ...
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1answer
24 views

Galera cluster implementation questions

I've just successfully created my first Galera cluster using MariaDB 10.0.20 between three servers. I have a few questions regarding my implementation: 1. what will happen if one server becomes ...
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1answer
21 views

SQL clustering without WSFC (Windows Server Failover Clustering)

Is it possible to cluster, or make SQL "highly available" without having to pay the huge enterprise prices? By the looks of it, any type of SQL clustering requires enterprise edition Windows Server. ...
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49 views

Can you list a Datastore Cluster's sDRS Schedule via PowerCLI?

We have a lot of datastore clusters, most if not all are supposed to have sDRS schedules applied to stop them moving VMs at busy periods. Obviously we could trawl through them manually to check if ...
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44 views

Multiple vCenter Services for redundancy

I've been reading up on linked mode, but this only applies to the management on multiple clusters from a single vCenter via linking other vCenter's into it. My question is - can you have two servers ...
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20 views

mysql galera 2-way cross-cluster replication

Scenario and setup Two mysql galera clusters in two datacenters with 2-way multi-master replication Each cluster has 3 nodes: 2 full nodes and 1 garbd node Example host names: dc1-sql1 --> ...
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3answers
74 views

How does HA / failover work?

Let's say we have ten servers, each one has a copy of stateless application. user enters address in a browser / client program. dns server returns a list of ip (however many people say that dns ...
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1answer
24 views

Pacemaker and Stonith : passive node won't bring up resources

I'm working with Pacemaker and Stonith for High-Availability with a 2-node cluster (nodes called here A and B). Both nodes have one IPMI as fence device. The deal is : A is currently running ...
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1answer
20 views

How to manage access to nodes in a cluster?

I am about to set up a server cluster for our company's web applications. At the beginning there will be 3 hardware servers in Proxmox HA setup in a remote datacenter running about 20-30 VMs all ...
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1answer
74 views

MariaDB Galera Cluster, Force Sync

I have three servers in a multi-master Galera cluster. I've imported some old databases recently, and noticed that the tables were being created across all three, but the data wasn't being ...
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135 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 ...
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28 views

Cassandra NetworkTopologyStrategy

I would like to configure the following multi-datacenter Cassandra cluster: DC-EUROPE has 3 Cassandra nodes (1.1.1.1, 1.1.1.2, 1.1.1.3) DC-ASIA has 3 Cassandra nodes (2.2.2.1, 2.2.2.2, 2.2.2.3) Each ...
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19 views

What happens if fleet can not meet the requirements for an unit

Take a look at the following scenario: I have a CoreOS / fleet cluster with 4 nodes. There are 4 apache units with the following line Conflicts=apache@%i.service One machine goes down. Fleet ...
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1answer
33 views

NetApp cluster fail to start

I have a big problem with my FAS2020 (configured as iScsi storage for 2 esxi 4 server). I couldn't ping the 2 ip address of the FAS so I connect by the serial port with putty for monitoring the boot ...
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1answer
39 views

What distributed FS, with small files read / write workload perform better?

I have 2 machines sharing storage via iscsi (multipath), soon we add another one, this machines are Web app servers that read small files on shared storage ( < 256kB), and write them back. so we ...
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17 views

LSF Cluster Upstart Job

So I would like machines in our office to auto start LSF on boot. So I took my first stab at writing an upstart job. The goal here is to run these commands for startup: /usr/local/lsf/bin/lsadmin ...
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17 views

How to mount disk in sheepdog cluster ?

In the documentation its given that, to mount the disk in the sheepdog node add following line in /etc/fstab /dev/sda1 /mnt/sheep/0 ext4 defaults,user_xattr,noatime 0 0 But I am facing some problem ...
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66 views

Heartbeat fails to start

I have two virtual machines running CentOS 6.6 (I use WMware workstation). I have heartbeat installed and configured on both. The configurations are: /etc/ha.d/ha.cf udpport 694 debugfile ...
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68 views

Why both nodes in OCFS2 cluster keep rebooting?

We created an OCSFS2 cluster by using SUSE Linux High Availability Extensions on SLES SP3. The cluster nodes are two Apache servers which share one disk. We have stonith enabled and SBD daemon. It ...
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84 views

MariaDB Galera Deployment

I am looking to experiment with MariaDB 10 Galera Cluster. I am looking for highly available, scalable and reliable architecture. Basically I am curious what would be the better architecture and would ...
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1answer
27 views

Pacemaker continously logging “Changed active directory”

I have a newly installed CentOS 6.6 two-node cluster using Pacemaker. Every 10 seconds /var/log/pacemaker.log shows this "Changed active directory to /var/lib/pacemaker/cores/root" message (and ...
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1answer
69 views

HA Cluster with OpenVZ and DRBD

I would like to create an HA Cluster using OpenVZ and DRBD. I found this tutorial http://www.olindata.com/blog/2013/12/building-ha-cluster-openvz-drbd-heartbeat-and-pacemaker and I got as far as Step ...
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60 views

Run Server from Clustered File Server DRBD & GFS2

We are trying to eliminate a single point of failure for our files without a SAN. We currently have a single server for file serving (locally), web server, and database (in VM). Looking at using DRBD ...
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2answers
127 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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64 views

keepalived cluster ping physical ip fails

My szenario looks like below: Router = R[number] Switch = S[number] R1      R2  I           I S1-----S2 ...
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59 views

pacemaker/corosync node doesnt work after system upgrade

Few days ago I updated(yum update) one of my cluster node. While yum was performing cleaning operations after upgrade it tried to restart pacemaker. This operation hanged for quite some time until I ...
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1answer
86 views

zpool disappears whenever solaris cluster reboot or power cycle

I have following setup Oracle Solaris 10 -> 5.10 Generic_147147-26 sun4v sparc Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit production Oracle Solaris Cluster 3.3u2 for Solaris ...
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1answer
420 views

Redis high availability and load balancing

I'm using Redis for some time and now we want to move to a redundant cluster which would be fault tolerant, highly available and load balanced. I principally use Redis for some PHP web application ...
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80 views

File locking with CTDB and GlusterFS not working

We are having issues getting our GlusterFS and CTDB implementation to work. It could be that what we are attempting to do is not supported but I'm not able to understand why. We have two file servers ...
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96 views

Unable to deploy war file on tomcat cluster node2

I have deployed a war file on tomcat cluster based node1 and successfully got deployed but it only replicates 0kb war file on node2 and not working. Attaching logs, please provide your valuable ...
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1answer
191 views

Utilizing A Secondary IP On A NIC In A Windows Cluster

RELEVANT INFORMATION I have a windows cluster with 3 nodes in it... Node1 Node2 Node3 I have 4 NICs on each node... NIC1_Host NIC2_Virtuals NIC3_Cluster_HB NIC4_Live_Migration This is the ...
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216 views

Why does requesting GPUs as a generic resource on a cluster running SLURM with the built-in plugin fail?

Disclaimer: This post is quite long as I tried to provide all relevant configuration information. Status and Problem: I adminster a gpu cluster and I want to use slurm for job management. ...
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83 views

What fence device setup would prevent a mutual-STONITH in a two-node RHEL cluster?

I've got a Red Hat cluster (corosync+rgmanager) software on RHEL 6.6 on physical Dell servers with iDRAC. This cluster is for stateless application (stunnel, a TLS gateway), so it doesn't need and ...
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1answer
41 views

How I do to run only a software in more than one computer? [closed]

I need to run a unique instance of a software in more than one computer, how I do this without a centralizer server? For example: 4 computers interconnected by the local network, 2 of then has "the ...
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14 views

Is a Beowulf cluster a solution for me? [duplicate]

Background I'm an undergrad working on an scientific experiment. Till now I was pilot testing our one of the program on Ubuntu 12.04 and now I need to deploy it. The PC on which I tested the program ...
4
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1answer
51 views

SAS balancing vs Network balancing

I want to configure file server in MS Windows Server 2012 R2 environment, which would load balance traffic. I have got a SAS disk array with 2 SAS controllers which is connected to 2 Hyper-V cluster ...