High-Availability

[DanG]

Yes that is true. OpenMosix was designed as an SSI ("Single system image")
cluster primarily as a load balancer. However there is a perl module
developed at CPAN OpenMosix::HA adding a single inittab structure and HA
capabilities for OpenMosix clusters with heartbeat capability. See below

NAME
    OpenMosix::HA -- High Availability (HA) layer for an openMosix cluster

SYNOPSIS
      use OpenMosix::HA;

      my $ha = new OpenMosix::HA;

      # spawn all apps for resource group "foo", runlevel "run"
      $ha->tell("foo","run");

      # spawn all apps for resource group "foo", runlevel "runmore"
      # (this stops everything started by runlevel "run")
      $ha->tell("foo","runmore");

      # get status of all resource groups
      $ha->status();

DESCRIPTION
    This module provides basic "init" functionality, giving you a single
    inittab-like file to manage daemon startup and restart across a cluster
    of openMosix machines.

    This gives you a high-availability cluster with low hardware overhead.
    In contrast to traditional HA clusters, we use the openMosix cluster
    membership facility to provide heartbeat and to detect network
    partitions.

    All you need to do is build a relatively conventional openMosix cluster,
    install this module, and configure it to start and manage your HA
    processes. There is no need to use the heartbeat serial cables, spare
    ethernet cards, or high-end server machines which traditional HA
    requires. There is no need for chained SCSI buses -- you can share disks
    among many nodes via any number of other current technologies, including
    SAN, NAS, GFS, or Firewire (IEEE-1394).


-----Original Message-----
From: owner-tlug-lxSQFCZeNF4 at public.gmane.org [mailto:owner-tlug at ss.org] On Behalf Of Robert
Brockway
Sent: Thursday, December 18, 2003 3:28 PM
To: tlug-lxSQFCZeNF4 at public.gmane.org
Subject: RE: [TLUG]: High-Availability

On Thu, 18 Dec 2003, DanG wrote:

> LVS is a very good software package that is constantly under 
> development and use. linux-ha.org works with LVS collaboratively.
> http://oscar.openclustergroup.org/tiki-index.php OSCAR is another open 
> source project for cluster builds you should look at. If you want an 
> easy cluster to setup and administer I would look at ClusterKnoppix 
> which is based on the Knoppix liveCD with OpenMosix clustering 
> integrated. This should make for a pretty easy install/setup 
> http://bofh.be/clusterknoppix/

Clustering is one of those terms which maybe a bit over-used in computing.

OpenMosix is not a tool that will supply HA, it is a load sharing system.

If an OpenMosix node dies then data is lost, plain & simple.  Infact right
now a process running under OM is susceptible to loss of the original node
_or_ the node the data moves too.

Rob

--
Robert Brockway B.Sc. email: robert-5LEc/6Zm6xCUd8a0hrldnti2O/JbrIOy at public.gmane.org, zzbrock at uqconnect.net
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