discusion related to cluster mecanism.

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2answers
271 views

Trying to install a cluster, DHCP failing to start

Trying to install a linux cluster using this tutorial. I am running CentOS 6.3. When I try to start DHCP with service dhcpd start, it fails. I've used tail -f /var/log/messages and dhcpd -t, but I ...
2
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1answer
10 views

Help in building Yocto(open embedded) projects using cluster computing in Linux

I need to reduce project build time in Yocto (open embedded) in Linux platform. So I decided to cluster computers for the best performance for compilation and building. My question: Is there any MPI ...
2
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1answer
67 views

Running GNU parallel --sem hangs on SGE Cluster

I'm trying to run 3 commands in parallel on an SGE cluster, e.g. cmds=("prog 1 2 3" "prog 4 5 6" "prog 7 8 9") for cmd in "${cmds[@]}" do sem -j 3 $cmd done sem --wait So, my commands execute ...
2
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1answer
180 views

Clustered NFS server reply ERR 24: Auth Bogus Credentials (seal broken)

I have 4 servers on the VirtualBox. Two of the servers are a CentOS 7 cluster with Pacemaker(corosync), and they have an NFSv4 server in Active/Passive mode. There are also 2 clients with CentOS 6, ...
2
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1answer
85 views

reduce bandwidth consumption from downloading yum updates

I have several machines (7) running fedora and would like to reduce the amount of external bandwidth I am consuming. I see that there were several attempts to setup mirrors, but those projects seem ...
2
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1answer
254 views

mpd daemon prematurely ending jobs

I am a little out of my depth here so bear with me. I am trying to configure mpirun and mpiexec to run software called Materials Studio on a 1 node, 2 processor, 12 core cluster. The submission scheme ...
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1answer
139 views

Zookeeper DNS name problems with leader elections when migrating from Windows to Debian

I am migrating a kafka/zookeeper cluster on Windows to Debian wheezy. Java version: 1.7.0_80 Debian version: 7.9 Zookeeper version: 3.3.5+dfsg1-2 0 Kafka version: 2.10-0.8.2.1 If I configure ...
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1answer
64 views

Failover NFS service with shared storage

I need to configure a cluster with shared storage that can be moved from Node A to Node B and vica versa. In case of failure of Node A, Node B should take over the IP address associated with the NFS ...
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1answer
64 views

Python processes appearing and disappearing in top

I concurrently launched around 12 Python scripts on a 24-core server (Ubuntu 14.04 LTS x64). Each of Python script takes around one hour to complete. I see in top that they appear quite sporadically, ...
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1answer
83 views

Cluster Lock Manager without TCP/IP

I have 2 linux sharing same SAN disk LUN. There are many cluster files systems to manage lock/unlock. But all of them are using a seperate TCP/IP comminication. But I need a cluster lock manager ...
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1answer
19 views

Terminal to manage cluster, where the nodes are accessible from a remote PC?

I need to manage multiple cluster nodes from my PC. The catch is that the cluster nodes are accessible only from a remote PC. So first I have to ssh to the remote PC, and then ssh to a cluster node ...
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1answer
14 views

How to see more information for queued Jobs in SLURM

With srun --test-only SLURM will return expected start date AND expected nodes. However, if the job is submitted, I cannot get the information about the nodes. Is there any way to find out, what ...
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1answer
389 views

Why did Red Hat drop support for DRBD beginning with RHEL 7?

Does anybody know the reasons why Red Hat decided to drop support for DRBD beginning with RHEL 7, thus favoring GlusterFS as the preferred solution for network-based replication / mirroring in a ...
0
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1answer
210 views

mysql high availablity for LAMP application (ubuntu 14.04)

im trying to achieve HIGH Availability (HA) for a LAMP application(News Portal website) which might be of interest to many unfamiliar users.For files im using Glusterfs (replica) for redundancy ...
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1answer
138 views

Powerful Workstation

I heard about ILM's (Industrial Light and Magic) workstations on which they create models and scenes for a lot of different movies. They have workstations with more than 1024 GB of ram and a lot of ...
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1answer
33 views

Is it possible to install RHEV on el6 clustered computer

Is it possible to use Linux (el6) clustered computer can be used as a hypervisor for RHEV 3.3/Ovirt 3.3? Cause, we can not combine RAM/CPU from two or more hypervisores to be considered as a one ...
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1answer
376 views

What software should I use to create a HPC (High performance compute) cluster with CentOS 6.5 VMs locally?

I've read about Torque, Slurm resource managers and Maui, Open Grid scheduler, Sonf of Grid Engine but I do not know which is more appropriate to use in a local environment? I've also read that I need ...
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0answers
636 views

Corosync/Pacemaker cluster loss of synchronization

I'm facing a problem with the corosync and pacemaker cluster software. I've two virtual nodes (Scientific Linux 6.4) and corosync/pacemaker installed on them: corosync-1.4.1-17.el6.x86_64 ...
3
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0answers
274 views

Should I investigate Rocks or Ubuntu/Mosix for building a cluster?

I work at a college doing system administration. Someone in their lab is looking to build a cluster for running complex Octave and C++ projects. They have brand new modern machines. My question is ...
2
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0answers
112 views

XFS over iSCSI share with cluster; will fencing cause data corruption/loss?

When using XFS on iSCSI share, where HA is enabled, nodes may be fenced by cluster. Will this result in data loss / corruption / etc. ?
2
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0answers
246 views

pacemaker hangs while stopping

I have recently installed pacemaker and corosync for managin a virtual IP. The thing is that when I want to stop a resource (Virtual IP) on all the nodes, the stop command hangs. [root@isis ~]# sudo ...
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0answers
146 views

Takeover delay in Heartbeat HA cluster

I have set up a heartbeat HA two node cluster. And both of server have same configuration of ha.cf #cat /etc/ha.cf logfile /var/log/ha-log autojoin none bcast eth1 warntime 20ms deadtime 40ms ...
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0answers
36 views

heartbeat stops after reviving primary node

I followed these steps correctly, everything worked well before I have revived heartbeat on node01 "at the last steps of the tutorial" when I hit /etc/init.d/heartbeat start it started correctly but ...
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0answers
18 views

FreeBSD 10.2 - Is three-way HAST replication possible?

I have a pair of FreeBSD 10.2 servers using HAST to keep a volume replicated between them. I'm introducing two new storage nodes that have much newer hardware and will eventually replace the existing ...
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0answers
372 views

clvm (cman) has problems with dlm

I am trying to create a volume group which is accessible on two servers with clvm. I read about it and it looks like it is most easily to do this with cman. But after hours of testing I cannot achieve ...
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0answers
712 views

About mem and vmem

I am working with a cluster machine running under linux. I have a shell script that uses mpirun to submit my jobs to the cluster machine. In that same script, I can choose the number of nodes that ...
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0answers
116 views

Microcomputer cluster for stress testing

I'm looking to build a microcomputer cluster at work for stress testing one of our applications, and while I have a little financial leeway, I would like to keep the cost low and the computing ...
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0answers
21 views

problem with ABAQUS job on Rocks cluster

I created ROCKS6 cluster and i installed ABAQUS on my cluster and it works well on frontend, but i can not submit job on my 2 other compute nodes. I just want to run ABAQUS on this cluster (frontend ...
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0answers
39 views

How to install ABAQUS software on Rocks cluster 6.2

First of all sorry for my english. I create a new cluster with 3 . which one of them is frontend and two of them is compute . i should notice that, i am newest in linux and linux hpc clustering. I ...
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0answers
10 views

Writing a unique number in a parallel ssh / clusterssh environment

I'm trying to set up a cluster of Kafka servers and I'm currently using clusterssh for it, which works great. As one step of the setup, I have to assign a unique id to every cluster (as in 0, 1, 2, ...
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0answers
9 views

High Performance Cluster setup

I am starting to setup a High Performance Cluster (HPC) that will have a head node, 16 sub nodes and 8 GPU nodes. I am looking into Red Hat 7.2 as they state to have HPC capability. Thoughts on ...
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49 views

How do I add a Redis Cluster to a Pacemaker CentOS 7 Cluster?

I need to set up a CentOS 7 web server cluster that is able to manage user sessions while also load balancing across the nodes in the cluster. Towards this end, I have transcribed instructions from ...
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0answers
16 views

spark job dependency on AMI version

I have run a spark job on emr cluster with AMI version 2.4.0-amzn-7 and it completes in 11 hours. but when same jobs are run on AMI 2.4.0-amzn-3, the process takes more than 18 hours to complete. ...
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0answers
39 views

HPL benchmark show very low calculation speed

I’m constructing cluster for mph parallel calculation. To check performance of my node, I used HPL linpack benchmark. However, the benchmark result is much more low than a theoretical value. The ...
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0answers
217 views

qsub job in state Eqw error: can't chdir to directory: No such file or directory

I'm trying to submit a job on a cluster via qsub, but it gets stuck in state "Eqw" with error message: $ qstat -j 466 | grep error error reason 1: 09/18/2015 17:12:32 [1125:3453]: error: ...
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0answers
28 views

Centos Redhat Cluster LICI RUCCI

I have 3 systems [Normal Desktops College LAB] with 2 Network Interfaces each node1.test.com : Public IP : 10.10.10.2 Cluster Hearbeat: 192.168.1.2 node2.test.com : Public IP : 10.10.10.3 Cluster ...
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0answers
15 views

XtreemOs for rendering

I am searching for a single system solution because i want to use such a system for rendering. I already found kerrighed but I did not get it working. Now i found the XtreemOS. On wikipedia, it says ...
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0answers
80 views

Getting error in nslookup

I am trying to do nslookup skhdphost1 but I am getting below error. When I try to Reverse lookup checking using command nslookup 172.16.xxx.xx again getting the same error: The error message is: ...
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0answers
251 views

rgmanager [fs] start_filesystem: Could not match “f6a58cf7-b39b-489c-add5-444ceab8af9d” with a real device

I am trying to install two node cluster for web server. We have super mico hardware HA BOX. It has 5 disk. one disk is used for node1 os installation and another disk is for node2 OS. Remaining disk ...
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0answers
9 views

Can the PBS job submission script be changed while queuing

I have prepared a script and submitted to a PBS queue on a cluster. However, I discovered that there's a typo in the script. Could I just modify the script when queuing or I have to qdel first before ...
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0answers
151 views

CentOS 6.5 + Pacemaker/Corosync + DRDB + MySQL Error

This is the first time I post on this forum. Glad to join the forum. I doing a project with Pacemaker/Corosync, DRDB and MySQL. I follow the document from clusterlab.org. Everything seem worked OK ...
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0answers
239 views

HAProxy with Roundrobin working only on 2 of 3 MySQL servers, why?

Good day. I'm following this article to configure HAProxy to balance with roundrobin between 3 MySQL servers (db1, db2, db3) in a MariaDB Galera cluster (working perfectly). However I have a ...
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0answers
85 views

How to benchmark performance and ensure high-availability in a CentOS 7 cluster?

To give you a little context on my question, I'd like to mention that I am writing an essay on high performance and high availability clusters using a 2-node (I know that is not optimal, but it's what ...
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0answers
1k views

Error starting MySQL in a MariaDB Galera cluster in CentOS 7

I'm trying to setup a MariaDB Galera cluster following this tutorial exactly as it is, and I'm stuck in the Step 7– Initialize the first cluster node, I'm doing so with sudo /etc/init.d/mysql start ...
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0answers
98 views

quorum disk and heuristic checking in CentOS7 Cluster

In CentOS6,we use to configure qdisk for two nodes cluster to quorate. How about in CentOS 7? I can't find any clue to do the same for it. Help will be much appreciated. Thanks,
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351 views

Two Nodes CentOS 7 Cluster clvmd

I am trying to set up two nodes CentOS 7 cluster with clvmd. I added dlmd and clvmd as clone resources in cluster using pcs command. When both nodes are up, dlmd and clvmd can start properly. But ...
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0answers
97 views

Problems with kerrighed

I heard about kerrighed and i want to use it for rendering with blender because it is a single system image. I tried to install it over pxe like the installation guide from kerrighed.org says. The ...
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0answers
25 views

centos cluster set core/each_program

I'm using unix server (OS: centos5) and I'm using several clusters. Some clusters have 8 cores, other are 24 cores and etc. I execute jobs using this command. qsub -q cluster_name -d $PWD ...
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0answers
176 views

Job IDs and their meaning/reference

Using Red Hat, I sent few jobs to a cluster and got "job IDs" in return. Using qstat I can see only one is running, one was canceled and the rest are still in the queue. I wrote something like this: ...