Re: openMosix-general digest, Vol 1 #1540 - 1 msg

Brian,

For an example, I run a cluster for R-Project software. 11 Nodes. 
Different platforms, but all the same kernel. CPUs are Pentium III, 
Pentium III Xeon, 4 different speeds depending the node type. R-Project 
is installed on only one node. This is the node where users connect to. 
They submit their job from this server. Some user are not aware that 
this is a cluster. They just know one server... This "master" is a slow 
server, to force migration. Physically, this is one of the slowest node 
I have, but I forced the speed to be slower than any other node in the 
cluster, using "mosctl setspeed 5000" on the master. I force one machine 
to be a master, but openMosix does not require a master.
The nodes of an openmosix cluster must not be the same at all, except this :

    * The CPU must be of the same architecture. This means that a
      Pentium III, 550 Mhz will work OK on a node with another node with
      Pentium IV, 3.6 GHz. An alpha CPU server will not work in a farm
      of Pentium based server. In fact, binary code must be compatible.
    * The Kernel must be the same. Don't mix 2.4 with 2.6. In a cluster,
      all kernels must be identical. Ex : 2.4.22-openmosix3smp.

Have a nice day.
Cheers,
JJ

openmosix-general-request-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org wrote:

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>   1. Cluster Config Question (Brian McEntire)
>
>--__--__--
>
>Message: 1
>Date: Fri, 9 Dec 2005 14:29:06 -0500
>From: Brian McEntire <[email protected]>
>To: openmosix-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
>Subject: [openMosix-general] Cluster Config Question
>
>------=_Part_8401_17034904.1134156546418
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>Hello OpenMosix users -
>
>I'm in the early planning stages of setting up a SSI cluster. I've read the
>OpenMosix Howto and also the FAQ, but I couldn't find a good answer to this
>question and I hope someone on the list can help:
>
>We have about 10 systems running 3 different versions of Red Hat Linux. The
>versions are RH 7.2, RHEL3 WS, and RHEL4 WS. I know RHEL4 may be a problem
>because it runs the 2.6.x version of the Linux kernel.
>
>My question is, how similar should the nodes be? Is it ideal if they are
>identical? Is it a problem is they have different applications installed on
>them? Most of the nodes at least have the same NFS mounts for storage
>already. But how does MOSIX deal with an ImageMagic process, for a random
>example, starting on one node that has ImageMagic installed, but then the
>process migrates to a node that doesn't have that app installed?
>
>I also read that people shouldn't expect big speed-ups on compiles, but
>compiling is only part of the workload for these clusters. If compiles stil=
>l
>work, and other loads can be effectively load balanced, compiles should
>benefit as a side effect. The question again comes down to, differences
>between the systems, are they okay? What happens if a compile starts on one
>system and then moves to another that doesn't have some required libraries
>or has a different version of GCC?
>
>Any pointers greatly appreciated! Thanks. -Brian
>
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>
>Hello OpenMosix users -<br>
><br>
>I'm in the early planning stages of setting up a SSI cluster. I've read
>the OpenMosix Howto and also the FAQ, but I couldn't find a good answer
>to this question and I hope someone on the list can help:<br>
><br>
>We have about 10 systems running 3 different versions of Red Hat Linux.
>The versions are RH 7.2, RHEL3 WS, and RHEL4 WS. I know RHEL4 may be a
>problem because it runs the 2.6.x version of the Linux kernel.<br>
><br>
>My question is, how similar should the nodes be? Is it ideal if they
>are identical? Is it a problem is they have different applications
>installed on them? Most of the nodes at least have the same NFS mounts
>for storage already. But how does MOSIX deal with an ImageMagic
>process, for a random example, starting on one node that has ImageMagic
>installed, but then the process migrates to a node that doesn't have
>that app installed?<br>
><br>
>I also read that people shouldn't expect big speed-ups on compiles, but
>compiling is only part of the workload for these clusters. If compiles
>still work, and other loads can be effectively load balanced, compiles
>should benefit as a side effect. The question again comes down to,
>differences between the systems, are they okay? What happens if a
>compile starts on one system and then moves to another that doesn't
>have some required libraries or has a different version of GCC?<br>
><br>
>Any pointers greatly appreciated! Thanks. -Brian<br>
>
>------=_Part_8401_17034904.1134156546418--
>
>
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>End of openMosix-general Digest
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>

-- 
Jean-Jacques Mierop <mieropj-h+R/[email protected]>
Senior UNIX Administrator
Bristol-Myers Squibb International / Technical Services Europe
"Of course my password is the same as my pet's name. My dog's name was Q47pY!3$H9x, but I change it every 90 days."