Questions about VMware Concepts

About VMware concepts, are following 5 statements true?
A. VMs do NOT reduce application licensing costs.
B. VMs Provide higher up time than physical servers.
C. VMs can be reverted to prior states to make recovery from accidents simpler.
D. VMs can NOT automatically increase and decrease their allocated memory while running.
E. VMs can be proactively migrated when a server failure is imminent.

And I also have 3 questions:
1. Does feature 'Enhanced vMotion Compatibility (EVC)' allow hardware maintenance to be performed at any time without impacting application availability? Why can't answer be feature vMotion?

2. Does Datacenter Virtualization results in 'same hardware footprint for every machine'? How so?

3. Can 'Hot Add' feature enable adding more CPUs or RAM to a VM - without incurring downtime?

Thanks.

AKulsh
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AkulshAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I know the Answers to these questions, now what do you think the Answers, are and we can work through them, and that way, I'm sure you'll understand better, rather than me give you the answers.

So post me your answers back....

1. No. Enhanced vMotion Compatibility (EVC) makes the processors in a Cluster similar, so you can live migrate a VM from one host to another with no downtime. This is used when you have older and newer generaton CPU chipsets.

see here

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003212

2. Yes, VMware Virtual Machines use the same hardware abstraction layer, and it's always been like that in all version of VMware products, so I can use a VMware VM from 1998, in VMware vSphere 6.0 today.

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003746

3. Yes, provided it's supported in the OS, and it's enabled in the VM settings.

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2051989
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Uni KittyCommented:
I love this approach Andrew! Looking forward to seeing the answers from Akulsh, this is going to be an excellent way to learn the answers. ;)
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Frans BrouwerSenior Systems AdministratorCommented:
way to go !
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AkulshAuthor Commented:
Andrew,

Thanks so much. I learned that Hot Add and Hot Plug are available for Win 2012 but must be enabled after shutting down the VMs.

About the 5 statements, here is what I think. Please correct me as needed.
A. VMs do NOT reduce application licensing costs. TRUE.
 B. VMs Provide higher up time than physical servers. TRUE
 C. VMs can be reverted to prior states to make recovery from accidents simpler. FALSE, since we may not have a snap-shot before the accident.
 D. VMs can NOT automatically increase and decrease their allocated memory while running. FALSE, they can increase/decrease allocated memory on fly.
 E. VMs can be proactively migrated when a server failure is imminent. TRUE

Thanks again.

AjayK
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
A is Correct.
B. If in the sense this is a VMware Question for an Exam, based on their Syllabus or Course, and Features - YES. This is because VMware is testing your knowledge on their features to provide Higher Availability of VMware VMs compared to Physical Computers/Servers. But remember the Host is Physical, and they can fail!

Do you know, what VMware Features they are, that provide this ?

C.is Correct - it is a Snapshot based question.

You can read more here in my EE Article

HOW TO: VMware Snapshots :- Be Patient

D. Correct. Once a VMs, is allocated resource, e.g. 4GB, it does not change automatically, something must be done to the VM, to change this resource.

E. Correct. If you are aware a Host Server is about to fail, you could use vMotion, the Live Migration of VMs from one host to another.

But ONLY if you know it is a going to fail.....there is no Automated Process, yet, that has AI, that knows it's going to fail, and transfer VMs from one host to another before failure.
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AkulshAuthor Commented:
Thanks. Yes this is in preparation for latest VCA-VDC exam.
It is noteworthy that in all practice tests:
- "VM reduce application licensing costs" is given as the Correct answer.
- "VMs Provide higher up time than physical servers" is given as Wrong answer. (Answer to your bold question is HA, an obvious major advantage of VMware Infrastructure.)
- "VMs can be reverted to prior states to make recovery from accidents simpler." is given as Wrong answer. However, here it may be considered wrong since they are talking about "accidents" before which there may not be a snapshot.
- "VMs can automatically increase and decrease their allocated memory while running." is given as Correct answer. This may be so if out of all allocated memory, say 4 GB, a VM may use only 1.5 GB initially and then add more on the fly? Is this not what happens?

Thanks.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Well, there is VMware HA, but in fact if you are using VMware FT (Fault Tolerance), there is no downtime.

So depends on the testing material VMware are testing you against.

You can only add more memory on the fly, if the OS Supports it, and the VM is configured for it.

BUT, it's not automatic!

If a VM is allocated 1GB in the Memory of VM settings, it cannot use more than this!

It can never grow beyond 1GB, but it can increase and decrease to 1GB.

For it to use more than 1GB,, the OS would need to support Hot Plug, and the VM would need to be configured for the VM was powered on, to have this feature enabled.

However, the VM could just request 500MB, and then use 256MB.

which is increase and decrease, OS feature.
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