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Snapshot 's and VMDK files

Posted on 2014-07-25
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Last Modified: 2014-09-02
Hi,

I have a couple of questions

1. I would request someone to kindly give me a description of the differences between the files highlighted in the first attachment which is VM-files.
2. In the second attachment it shows a vm's snapshot manager. What does it actually mean. Is all my current configuration residing on snapshot. What happens if I delete it or revert to a step above?
3. How do I clean the VM folder and put it free from unnecessary logs.
VM-files.PNG
Snapshot-manager.PNG
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Question by:Druva Simha Kolli
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Author Comment

by:Druva Simha Kolli
ID: 40218707
I know this is a very basic question here. but it always confuses me. So request you to kindly explain the difference and which vmdk file and snapshot file does my current configuration reside on? And also what is the best practice.
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LVL 119
ID: 40218986
1. see below

vSWP - these are memory swap files, which are created when you power up a VM, a file is created which is the same size as RAM allocated to the VM, or it's Memory reservation, memory is swapped to these files, should paging occur, they are no snapshot files.

the files -00001.vmdk and -00002.vmdk are the Delta Files, e.g. the Snapshot files of changes that are occuring in the VM. You have a parent disk and a child disk (delta or snapshot)

*.vmsn is the snapshot of memory, in the VM, at the time the VM was snapshotted, if you ticked that button.

2. If you Revert a Snapshot, you will go back in time to that VM, at it's creation, discarding all recent changes.

3. There is no real need to get into the folder, and change or remove files. If you do, you could accidentally delete a file which is required.

As for best practice, do not leave a VM on a snapshot for long (2 days), when a VM is running on a snapshot, performance is poor.

Also see my EE Article I wrote

HOW TO: VMware Snapshots :- Be Patient
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Author Comment

by:Druva Simha Kolli
ID: 40220769
Thanks a lot Hancock. I will go through the link..
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Author Comment

by:Druva Simha Kolli
ID: 40220782
How do I make sure the VM does not run on the snapshot after the latest configuration changes? And when I revert I want to preserve the latest configuration changes.
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LVL 119

Accepted Solution

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Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 40221218
You go to Snapshot Manager, and Click DELETE ALL. (that will remove all the snapshots) and maintain the latest configuration.

or Revert to a Snapshot, and then Select DELETE the Snapshot.
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Author Comment

by:Druva Simha Kolli
ID: 40230994
I will like to retain the existing configuration so I will go with the CLICK DELETE ALL.

Thanks a ton Andrew.
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LVL 119
ID: 40231062
That will certainly do it.
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Author Comment

by:Druva Simha Kolli
ID: 40231093
Thank you.. Will get back..
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