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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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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28 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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5 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
39 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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1answer
14 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
38 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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33 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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14 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
19 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
19 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. ...
4
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1answer
40 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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1answer
26 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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14 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
62 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
20 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
17 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
48 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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112 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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1answer
19 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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1answer
18 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 ...
3
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1answer
32 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
34 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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13 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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14 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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52 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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57 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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21 views

How to use baseimage and deriverd image to create VMs in ceph cluster?

Scenerio: Suppose I have a template disk image and I want to use this to create many VMs by using this template file as a baseimage and derived image for different VM instances. in qemu we can use ...
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1answer
47 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
23 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
57 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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0answers
52 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
92 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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60 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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50 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 ...
3
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1answer
68 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
270 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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71 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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0answers
80 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
110 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 ...
7
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1answer
189 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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0answers
74 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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0answers
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
47 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 ...
0
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0answers
27 views

Unable to permission NAS to give standard users rw on Rocks cluster

I am trying to set up a Rocks cluster for distributed computing. I would like to have it so that there is a network shared scratch space mounted to each compute node on which all users (including ...
0
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2answers
76 views

How to enable “persistent mode” in Windows failover cluster manager 2012?

In Windows Server 2008 R2 there was a checkbox named "Enable persistent mode" on a General tab in the Properties of a cluster resource. In Windows Server 2012 that seems to have disappeared. My ...
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4answers
689 views

Two-Node Server 2012 R2 Hyper-V Cluster: Is it possible use local physical disks in the cluster?

Looking at the following Clustered Shared Spaces TechNet article, and it looks like this only applies to hosts sharing a JBOD enclosure by way of external SAS backplane. However, each host in the ...
2
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1answer
200 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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1answer
78 views

Cluster vs Virtualization [closed]

I’m working in releasing a video hosting website (files are from webcams) Each file size will be less than 1 mb. I would like to be able to easily extend my storage capacity and have high ...
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1answer
30 views

How to setup user accounts on a secondary server in High Availability?

Working with two Microsoft SQL 2012 servers in Always On High Availability configuration running on Windows Server 2012 R2. Setup works well and failover is almost flawless. However, the software ...