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Snapshots are great tool for a loud environment
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Then make changes and experiment with it and return back to the original state
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Before we continue I have to emphasize using caution when taking snapshots in a production environment
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They're not intended to be used as backups
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And running on Snapshot for long periods of time more than a day or two or running off too many snapshots consigna
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Magician you shouldn't take snapshots on a virtual machine that syncs with an outside Source such as an active directory server
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Neymar has an excellent knowledge base article discussing snapshots
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And it has a lot of detail about how snapshots work in the precautions you should take when using them
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Let's take a look at using a snapshot
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Let me see him one here currently has no snapshots on the virtual machine
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If I go to the directory
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Where that works machine is being stored
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I do a LS Dash L we can see that right now there is a single vmdk file
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Take snapshot
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We'll call this one
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Snapchat one knows I have the option of Snapchatting the virtual machine memory
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If I snapshot the memory then I have the option of coming back to a live running virtual machine without the contents of memory the rich
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Can I come back to is going to be shut down
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For this one I'm not going to take a snapshot of memory I'll click on okay
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Watch the processing without memory goes really really quick the reason it goes quick is that we're not making a copy of the heart
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Hard drive and then running off of that copy
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Instead let's take a look at the drive now
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What happens is that the original disk is still there and it has become read only
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Emily created a new desk is called a Delta disc
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Reeds are going to either come from the Delta disc first if it's a block that's been changed
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We're from the original desk if the block that has not been changed since we took the snapshot
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Now I have this little Target indicating this is where I'm currently running off of snapshot one which means I'm running off of my
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First out the desk
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Let's take a second snapshot
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And this time I'm going to snapshot the virtual machines memory
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Now this one takes significantly longer
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As the entire contents of memory of the virtual machine is being written to disk
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Once it's completed I now have my second snapshot in nose that has a little green triangle indicating that it has memory and this
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Escambia running virtual machine
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Notice now I have three vmdk files
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My original disk and the first snapshot are both read only now and I'll rights are going to
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To the second Delta that's been created
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Now any changes I make to the virtual machine are going to be reverted to if I go back to an earlier version of the snaps
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That includes changes to the virtual machine Hardware
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So if I were to come in here at the settings on this roach machine
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A new network adapter
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Now we go to monitor
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Summary
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We'll see that we have two network adapters on this virtual machine
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Go back to snapshots
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When I select the snapshot and I say
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Revert to what I'm saying is I want to delete all of the information that has changed since I took that long
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Last snapshot
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And it's going to give me a warning
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And now I've just jump back in time to the point where I took that snapshot
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Go back to summary and we'll see that I only have the single network adapter
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If we take a look at the disc
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Never going to see that I'm running off of a 03 Delta disc as to got deleted and now I'm running off of a new
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When I select delete all
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What's going to happen in this case depends on where this little blue Target is
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And this example here if I delete all of the snapshots then the data from both of those Delta disc is going to get raw
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Rolled back up into the original
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Because it's running off of both of those
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So we do actions
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Delete all snapshots
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This has no effect on our running virtual machine we're just consolidating all of the disc back into a single disc we no longer have the
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Ability to move back and forth between the snapshots
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Now there's no snapshots on this virtual machine
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We take a look at Linux VM to situation here is a little bit different
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I have four snapshots
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First I took a snapshot and that was snapshot one
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Then I took a second snapshot on that same chain that became too
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Answered one became snapshots free
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At that point
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I reverted back to the original disc
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And took another snapshot and that became for so the chain that I'm running off of where this target is is
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1
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The data that is on 2 and 3 is not part of my current chain
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So when I go to
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All actions and delete all snapshots
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All of the data that is in two and three is going to be lost forever
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One final example here
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I'm running off of the second snapshot
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Currently and I can select the first one and do a revert to
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Now notice now lyrics machine is going to come back powered off
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Now I am here
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I'm running
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In between the first and the second snapshot
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If I now delete the second snapshot
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All of that information is once again going to go away cuz it's not part of my current running chain
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Stop shots are rather complicated so don't get too complex with them however they do make a great tool
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For being able to jump back in time
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I highly recommend playing around with them and absorbing what happens on the disc when you do so
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