0
votes
4answers
82 views

How do I change multiple linux servers' /etc/fstab simultaneously

We have plenty of linux server that will mount a few linux file server by NFS or SMB using /etc/fstab But manually changing each server's /etc/fstab is very tedious. Is there any way to edit ...
1
vote
1answer
30 views

IBM V7000 firmware upgrade effect on mounted LUN

We've IBM storwize V7000 Storage where the firmware is going to be upgraded to latest version.. This will require a reboot to the storage. I've got arround 10 LUN's (almost 10TB) coming from this ...
0
votes
0answers
40 views

What do I need to increase my processing power?

Ok so I have written this program in Python 2.7 that runs on a desktop machine running Arch Linux. Without getting into the big details, this program takes a data-point, performs a series of ...
1
vote
0answers
43 views

How can I run a CentOS (Red Hat) cluster in degraded mode?

I've installed Red Hat's cluster software on an install of CentOS 6.5, and use it to provide redundant routing from one network to another. This works fine, and I have a pair of boxes providing the ...
2
votes
1answer
126 views

Beowulf cluster storage setup [closed]

I'm a Computer Engineering student working on a project with a Verari blade cluster, a bit outdated for today standards. I had acquired some Unix experience but I'm not an expert at all. This Verari ...
0
votes
0answers
62 views

MariaDB how to handle 2/3 node failure in multi master cluster.

I run 3 node multi master MariaDB galera cluster. It basically works for me how it is. When one node fails, two other work and it's fine. But I'm wondering is there a way for it to keep working on ...
1
vote
0answers
30 views

pacemaker cluster heavy load with sbd and noop scheduler

Anybody have experience with nood scheduler? i know the sbd process is a real time process, so with default linux io scheduler cfq, the sbd process works very well on high io heave load. The noop ...
3
votes
1answer
140 views

Choice of distributed filesystem for intensive reads and writes

I have a series of servers (HP ProLiant, 34 servers) each of which with 500 G of hard drive space. These servers are part of a computational cluster which runs processes that roughly fall into two ...
0
votes
0answers
50 views

Number of public ips for wackamole

I am trying to configure a highly available cluster consisting of three boxes with public ips. How many public IP addresses will I require for this? Can I configure spread on a private NIC and manage ...
0
votes
1answer
134 views

pbs check how much cpu a job is using / job % cpu usage

On a cluster a job is submitted to run on N CPUs. qstat -f doesn't show how much CPU resources the job is using other than the time. How does one check whether 100% of each CPU power is used? It is ...
0
votes
1answer
29 views

Running jobs in a HPC cluster [closed]

I'm quite new to HPC environment. Is there any difference in running a job on a node utilizing 8 cores and running the same job on 8 nodes utilizing I core in terms of performance or walltime used. ...
0
votes
1answer
199 views

MariaDB Galera Cluster hang after issue cluster command

When trying to cluster two MariaDB Galera servers on RHEL 6 together using the command: mysqld -uroot --wsrep_cluster_address=gcomm:// and the screen then sits there, and looks at me with this ...
1
vote
1answer
245 views

Is there a programmatic way to determine free disk space on a Linux server?

I have a collection of Linux servers, each of which has a local hard drive with a /tmp directory. Occasionally, the /tmp directory on a server will fill up and cause errors. I want to automate the ...
7
votes
2answers
137 views

What “pieces” are needed in order to set up a cluster of physical servers?

Background: Currently, we use Rackspace cloud servers. We have no intention to stop using them, but would like to look into setting up a cluster of physical servers (probably desktop computers in the ...
0
votes
1answer
81 views

In search of a distributed file-level filesystem [closed]

I'm looking for a distributed, fault-tolerant file-level (not block-level, preferably) filesystem for use in a small Linux-based HA cluster of sorts. The files that are stored will be fairly small ...
-3
votes
1answer
77 views

Windows or Linux cluster [closed]

I'm thinking on making a computing cluster at home to render things that I do in 3d programs like blender, maya and UDK. can I use a linux cluster enen though UDK only runs on on windows or am I ...
0
votes
0answers
91 views

Linux Postfix MySql Courier Imap (single data dir and master slave database)

I have a mail server (postfix,mysql,courier) my imap connections are to high and burdens the server badly. I was thinking of: Setup postfix, Mysql, Courier then replicate database on slaves and mount ...
0
votes
1answer
118 views

Does 'top' show memory / CPU usage of parallel processes on cluster?

Recently inherited a neglected cluster: I'm trying to do some sanity checks on it. Running a benchmark on node X and then running 'top' shows high cpu usage from mpi processes (as expected), but on ...
2
votes
1answer
598 views

Why do Layer 7 load balancers configuration not require any client configuration changes?

For example, for haproxy (layer 7) load balancing, you only need to configure the "real servers" or "backends" behind the VIP (i.e., cluster IP). E.g.: listen smtp 192.168.3.10:25 mode tcp ...
0
votes
1answer
112 views

How to build a personal cluster?

I have a debian server running some services (mail, web, git, mysql...). But it is alone, meaning that if it breaks, I have to repair it to access my services. I'd like to put a second server so that ...
0
votes
1answer
87 views

Red-Hat Cluster doesnt migrate services on node shutdown

I have a RHCS with two nodes and manual fencing. when I restart Node 1 (the primary) it migrates both services to Node 2 automatically. but when I shutdown Node 1, it doesnt happen and I need to use ...
1
vote
1answer
532 views

keepalived 2 VIP and 2 servers

Is it possible to configure keepalived in a such way? In normal state VIP_1 assigned to SERVER_1 and VIP_2 assigned to SERVER_2 on server failure all VIP's going to working server, and after failed ...
5
votes
1answer
591 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+ ...
1
vote
3answers
159 views

Appropriate network file system for huge (5+ Gb) files

I've got a number of servers used for HPC / cluster computing and I noticed that, given the fact that part of the computations they run use huge files over NFS, this causes significant bottlenecks. ...
-1
votes
1answer
64 views

How to migrate a webapplication to a cluster?

I have a python web application running on linux nginx + uwsgi. I am currently running this on a single machine. I would like to migrate this setup to a cluster. I am new to clusters. What are the ...
1
vote
0answers
53 views

OSPF on XEN host running several VMs

Is it possible to set OSPFs areas in a XEN environment to setup a virtual cluster? Main intention is to avoid a external router since all VMs will run inside the same machine.
5
votes
1answer
2k 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 ...
2
votes
4answers
320 views

Newbie questions on MAC and high availability failovers

I am reading about High Availability and I can not understand the following I read: On failover the primary IP migrates to the backup server BUT so must the MAC address. Specifically I read that ...
0
votes
3answers
82 views

Multiport NICs in servers and clusters [closed]

I wanted to know are multi-port NICs common in server systems? E.g in clustering are they used always?
1
vote
2answers
290 views

How to manage several Linux workstation like a cluster? [closed]

How does one go about managing a lab of Linux workstations? I'd like for users to be able to log in, run their GUI apps (LibreOffice, Firefox, Eclipse, etc), and for the computers to be able to be ...
-1
votes
1answer
101 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. ...
2
votes
2answers
75 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 ...
0
votes
1answer
1k views

Mounting vmfs5 under linux?

Can anyone tell me if there is a safe (i.e. data won't be corrupted) a VMFS 5 filesystem under linux, where the VMFS 5 filesystem is already mounted by several ESXi hosts in a vSphere cluster? Thanks ...
2
votes
1answer
633 views

Postifix SMTP Load Balance

I want to load balance outbound emails between 3 post-fix gateways for sending mails only reason is to use multiple different source IPs to increase throughput & inbox delivery. Each gateway ...
0
votes
3answers
99 views

Clustering a web server

With 4 servers with OpenSuse is it possible to cluster them all together to run websites? What is involved in clustering and is anything special needed to cluster the machines together so they work as ...
1
vote
1answer
900 views

Tomcat 7.0 Clustering FarmWarDeployer Not working

I'm currently working on a Tomcat Cluster for Q&A, but unfortunatly, it seems that the auto deploy of a war across this cluster is not working at all. I know the cluster is working perfectly ...
1
vote
2answers
210 views

Server Clustering on differen OS : CentOs and Debian [closed]

I have two dedicated servers in two different locations. One at USA (Based on CentOS), another at Asia (Based on Debian). Need to implement High Availability HTTP Clustering. The main complexity is ...
3
votes
2answers
837 views

csync2 ERROR: Connection to remote host failed

I was unable to find any articles to answer this question, so my best bet was to post this here: Scenario We have 2x application servers in production hosting a PHP website and I would like some ...
2
votes
6answers
3k views

alternative to Clusterssh for managing multiple SSH server

Is there any alternative to Clusterssh,pssh etc? to manage multiple ssh based servers through one interface? one weakness in Clusterssh is that my servers use key based authentication, with ...
3
votes
1answer
228 views

Are there any serverless distributed filesystems?

Similar to Is there a Distributed SAN/Storage System out there? or Distributed redundant storage solution?, except with a couple key differences (and two years newer). Context: I have a small Rocks ...
1
vote
3answers
70 views

Building right system for my needs [closed]

I will be providing "File-Hosting" service and I need something that works with me along the line and allow the project to expand. At first I was thinking about one big server with RAID 5 as a ...
0
votes
1answer
635 views

How do you configure Pacemaker to mount the DRBD data directory on the slave?

how do you get the Slave node of a DRBD pair to mount the data directory so data can be sync'd? I went through the following guide: https://wiki.edubuntu.org/ClusterStack/Natty#Prepare_Partitions to ...
1
vote
1answer
856 views

How do you setup a virtual IP on a Linux cluster?

I am having some problems setting a virtual IP and Linux (Ubuntu) cluster and I am hoping someone can help. This is the first node cluster I've tried to setup and I am not finding many resources in ...
0
votes
1answer
96 views

delete all files on all nodes on a RedHat cluster?

I am developing a program that runs on a cluster and writes a lot of short bits. First, it outputs to the node's scratch directory; when it is done, it rsyncs the files to a hard drive and then ...
3
votes
1answer
577 views

Shared Block Device File System (iSCSI)

I wanted some advice on a file system to use on across 5-10 servers that have a shared block device (iSCSI), GlusterFS and LusterFS seem to be it, but they dont say anything about shared block device ...
-1
votes
1answer
110 views

Active node stops resources when pasive node is shutdown

2 nodes, active/pasive. 2 resources, a virtual ip, openLdap, and the nfs mount where openldap saves the data. When both nodes are up, things worked fine. You could move resources away and put the ...
0
votes
1answer
60 views

What's the best management distro for xCat? [closed]

I want to deploy a iDataPlex cluster but using only free software with xCat. The xCat start guide uses Red Hat Enterprise Linux 5 in the management node. What's the best free distro to install ...
0
votes
0answers
550 views

Member Status: Inquorate in RHEL 5.6

I've encountered a strange issue. I had to change the time on my Linux RHEL cluster system. I've done it using the following command from the root user: date +%T -s "10:13:13" After doing this, ...
0
votes
1answer
526 views

Plesk CP with a linux cluster

I've managed to start a project where i should be implementing a linux cluster mainly for webhosting. I need to run plesk on top of that cluster in order to provide cps to customers but there seems to ...
1
vote
1answer
273 views

Linux HA - Best Heartbeat hardware solution

Hi all I would ask anyone what is the best layer 2 medium for heartbeat in Linux and how it's best configured. More precisely I've been thinking about a dedicated NIC for that purpose but then i ...