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List:       xen-users
Subject:    RE: [Xen-users] Qcow utilities
From:       Simon Hobson <linux () thehobsons ! co ! uk>
Date:       2009-04-30 20:54:57
Message-ID: a06240835c61fbf8b7291 () simon ! thehobsons ! co ! uk
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Joe Hammerman wrote:

>         The main goal is a to use a shared root image for a set of 
>Virtual Machines. Management thinks this will keep the machine more 
>'in sync'.

It won't, not unless you use it AS A SHARED FILESYSTEM

If you use any form of COW image then each guest will diverge - 
update a file on each guest and each guest will have a separate copy 
of the file. You CANNOT update the base image as that would 
immediately corrupt ALL the images that rely on it.

If you use a shared filesystem then you could stop the guests, update 
the shared filesystem, and restart the guests - though you may 
actually get away with guests running depending on what you are 
updating.


-- 
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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