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managing Snapshots

Posted on 2014-04-03
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Last Modified: 2014-04-04
In the case there are  several snapshots taken:

01/01/2014
02/01/2014
03/01/2014
04/01/2014

--- Vmware has the snapshot consolidating option: I wonder what that means?

-- in the scenario where I want to revert to the state of 03/01/2014, I will just select 03/01/2014 then click on Go TO button in the snapshot manager.
at this stage , what will happen to the other snapshots, will they stay there in the snapshot manager? in the case they are not needed, if I delete them will they commit the changes to the main disk…if so that may put unwanted data…

So how do I revert to a certain snapshot and getting rid of other snapshots without having the unwanted data from deleted snapshots to be committed?

Thank you
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Question by:jskfan
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by:Andrew Hancock (VMware vExpert / EE MVE)
Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
ID: 39975454
--- Vmware has the snapshot consolidating option: I wonder what that means?

Snapshot Consolidation, will remove ALL the Snapshots.

see here

https://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.vm_admin.doc%2FGUID-A42D707D-A271-4B7B-925B-07AE5BF4DC9A.html

VMware KB: Consolidating snapshots in vSphere 5.x

-- in the scenario where I want to revert to the state of 03/01/2014, I will just select 03/01/2014 then click on Go TO button in the snapshot manager.
at this stage , what will happen to the other snapshots, will they stay there in the snapshot manager?

You will revert to Snapshot 03/01/2014, and a new Snapshot will be created, as it's added to. The existing snapshots will be left.

in the case they are not needed, if I delete them will they commit the changes to the main disk…if so that may put unwanted data…

NO, those snapshots will be discarded, and deleted, and will not merge the data toi parent disk.


Revert to the snapshot you WANT to, and then select the Snapshot, and select DELETE.

I would suggest, a trial and practice using these features.

Please also not that ANY VM running on a Snapshot disk, is slow, performance is poor.

Snapshots are not BACKUPS!

Please see my EE Article for more info...

HOW TO: VMware Snapshots :- Be Patient
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Author Comment

by:jskfan
ID: 39975594
SO  I can just revert back to 03/01/2014 and Delete  the rest of Snapshots…
That way only the changes made to 03/01/2014 will be committed … Correct ?

I wonder why other Snapshots will not get committed?

Though I do not want them to be committed…except for 03/10/2014…
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Author Comment

by:jskfan
ID: 39975667
Unless if there is a logic behind the scene, so that when you revert back to a specific snapshot, it breaks the links between the main vmdk and all other snapshots..in other words other snapshots vmdk files will have no link to the main vmdk ...
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Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
ID: 39976194
It's a three step process

1. Revert
2. Delete Snapshots.
3. Then DELETE ALL.

You will then end up with a Snapshoty FREE VM.

That is correct, when you revert, the chain is changed, and it starts writing to a new snapshot.

Try it, practice, and watch the datastore.

Pointers are changed......

So Reverting Breaks the Chain.....and then you are free to dispose of the existing snapshots after the current one you are on!

But use DELETE, not DELETE ALL.
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Author Closing Comment

by:jskfan
ID: 39977550
Thank you
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