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Re: [Xen-users] Re: cLVM on Debian/Lenny

To: Olivier Le Cam <Olivier.LeCam@xxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Re: cLVM on Debian/Lenny
From: Jan Kalcic <jandot@xxxxxxxxxxxxxx>
Date: Mon, 20 Apr 2009 14:08:47 +0200
Cc: Ferenc Wagner <wferi@xxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx, Thiago Camargo Martins Cordeiro <thiagocmartinsc@xxxxxxxxx>, Javier Guerra <javier@xxxxxxxxxxx>
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Olivier Le Cam wrote:
> Hi -
> Thiago Camargo Martins Cordeiro wrote:
>> Yes! Please! Share your entire procedure and conf files!
>> -
>>  Thiago
>> 2009/4/17 Javier Guerra <javier@xxxxxxxxxxx <mailto:javier@xxxxxxxxxxx>>
>>     On Fri, Apr 17, 2009 at 8:22 AM, Olivier Le Cam
>>     <Olivier.LeCam@xxxxxxxxxxxxxxxxxxxxx
>>     <mailto:Olivier.LeCam@xxxxxxxxxxxxxxxxxxxxx>> wrote:
>>      > Feel free to contact me if you need instructions or want to get a
>>     copy of
>>      > the clvm deb package with openais for lenny on amd64.
>>     sure, please tell your procedure.
> There you are:
> http://h2o.glou.fr/post/2009/04/20/clvm-openais-on-Debian/Lenny
Thanks, that's very interesting.

A stupid question just to better understand how cLVM works. Forgive me.

I think of cLVM as the LVM with the cluster extension. Any setting on a
shared storage is visible by all the nodes of the cluster.
But what exactly does this mean? At which level (VG or LV) does the
locking library work? Can I enable (active) the same VG on different
nodes? If yes, how cLVM prevent split-brain? I would eventually be able
to load a LV only on one node?


Can I balance the load running the VMs on several nodes?

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