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Choosing the right virtualization tech for your environment

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And what about maintenance
roberto_maietta@... 7th Feb 2008
With all the different flavours of VM, what enterprise products are available to apply security patches to the myriad operating systems? What is the process involved in spinning up these images, applying the patches, spinning them down, then spinning them up again and testing them...?

What if there are multiple instances of a VM on a host. How does this play to the maintenance window? And what of the patching of the host itself?

I am not a fan of VM at all. The reason for this is because in every instance I have been involved with, this is a many-to-one relationship, where it requires many security patching efforts to be run on one machine.

Far better to run a one-to-many relationship, ala Citrix. Citrix slices the machine into memory chunks, with only the one operating system, offereing many opportunities to scale up and make more use out of a server.

I realise its not the same thing, but the administration overhead on VM is largely ignored, but there are real costs to this, particularly with overtime for engineers, should it come to that.
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