Models of VM, Windows and related Clones updates

In our society, we have a set of VM templates for a variety of different versions of Windows, we need to test our software. Our test workflow goes like this:

1 Tester creates a new, empty configuration

2 Tester adds new clone linked VMs for each version of Windows they need to test against, using our models.

3. tests coming, development challenges coming, more tests, etc.

4. when the test is finished, VMs will be cancelled but must be kept available for a period of time (several weeks or several months for example)

Periodically, we run Windows updates on the models to keep them informed. In my view, that it is cancelling publication of the model, deploying, running updates, Undeploying and then publish it again.

But this raises a few questions:

We expect problems if not to publish models, run Windows update and then republish these models when there is, linked clone VMs based on them? Through this repeatedly over time will start to degrade the performance of the models (due to new links in chains)? How often, if ever, should we be consolidate models (we prefer to minimize this for reasons of space)?

In fact, the picture is slightly more complicated, because the models VM themselves are linked clones:

Windows-> add Visual Studio 6-> add to Visual Studio 2005-> add to Visual Studio 2008-> add to Visual Studio 2010

Most of our test VMs are linked clones since the last link in the chain above: windows with a variety of pre-installed Visual Studio versions.

I would be grateful of any advice on 1) how we should address updates of Windows running on the models and the 2) when, if ever, we must consolidate the models.

Thank you

Adam

Periodically, we run Windows updates on the models to keep them informed. In my view, that it is cancelling publication of the model, deploying, running updates, Undeploying and then publish it again.

Could they remove just the configurations if they're going to be just "sitting there"?  If you want to keep them fresh and current (compared to the model itself), then they should really just remove the configuration and create a new one if necessary.

We expect problems if not to publish models, run Windows update and then republish these models when there is, linked clone VMs based on them? Through this repeatedly over time will start to degrade the performance of the models (due to new links in chains)? How often, if ever, should we be consolidate models (we prefer to minimize this for reasons of space)?

I expect questions if you just don't publish/deploy/update / publish.  When "unpublish you" a new link in the chain is done, so any existing VMs based on the previous instance of the virtual machine will continue to exist without error.  All the updates that are placed in a new location, and new virtual machines will be based out of this instance, once you have published it.

Storage performance can degrade over time, but it really depends on the profile of IO of the virtual machines themselves and the length of the string of this virtual machine.  If the update cycle occurs every month, then perhaps consolidate records each h1/h2.  If you're updating models every week, then maybe do it once per quarter.  It is just the management fees.  The technical limit is 30 links in the chain, but try to keep it under 15 or more.

(1) how we tackle running Windows updates on the models and 2) while, if ever, we must consolidate the models.

I think that my comments above should help you out.

Best regards

Jon Hemming

Tags: VMware

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