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RE: [Xen-users] Qcow utilities

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

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