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
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
ASKER CERTIFIED SOLUTION
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Uni Kitty
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. ;)
way to go !
ASKER
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
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
SOLUTION
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ASKER
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.
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.
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.
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.