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Snapshot vmware

Posted on 2011-10-13
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Last Modified: 2012-05-12
I have problem with snapshot on my vm. It is like I put in my scrren shot  attached on this request. I would like to know how to activate it.
vmproblem.JPG
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Question by:beke_josue
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LVL 124
ID: 36963293
Just Select Take Snapshot to Activate it.

A snapshot is NOT a backup of a VM; that is a gross misconception.  

A snap shot is a way to preserve a point in time when the VM was running OK before making changes. A snapshot is NOT a way to get a static copy of a VM before making changes.  When you take a snapshot of a VM what happens is that a delta file gets created and the original VMDK file gets converted to a Read-Only file.  There is an active link between the original VMDK file and the new delta file.  Anything that gets written to the VM actually gets written to the delta file.   The correct way to use a snapshot is when you want to make some change to a VM like adding a new app or a patch; something that might damage the guest OS. After you apply the patch or make the change and it’s stable, you should really go into snapshot manager and delete the snapshot which will commit the changes to the original VM, delete the snap, and make the VMDK file RW. The official stance is that you really shouldn’t have more than one snap at a time and that you should not leave them out there for long periods of time. Adding more snaps and leaving them there a long time degrades the performance of the VM.  If the patch or whatever goes badly or for some reason you need to get back to the original unmodified VM, that’s possible as well.  

I highly recommend reading these 2 articles on VMware Virtual Machine Snapshots:

Understanding Snapshots - http://kb.vmware.com/kb/1015180
Snaphot Best Practices - http://kb.vmware.com/kb/1025279

Also check out the following Snapshot Articles by Eric Siebert

Pt.1- http://is.gd/Lajg4p
Pt.2- http://is.gd/NdKQWC
Pt.3- http://is.gd/tp2vEK
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Author Comment

by:beke_josue
ID: 36963744
Here we cannot take «take snapshot» because the 2 fisrt options are not active. Only the third one is active. Check my picture.
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LVL 124
ID: 36963777
if you click Snapshot Manager does it show any snapshots?
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LVL 124
ID: 36963794
Check the following article:-

http://kb.vmware.com/kb/1006392

are you using Physical RDMs, or Clustering?
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Author Comment

by:beke_josue
ID: 36963954
I use clustering. For the other vms there is no problem. For that one I cannot create snapshot. I read the article but it is not exactly my case.
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LVL 124
ID: 36963993
What disks are you using in clustering?

RDMs? - Snapshot not supported.
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Author Comment

by:beke_josue
ID: 36964494
How to know the kind of disk I use in the vm?
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LVL 124
ID: 36964538
How are you using clustering?

How have you attached the virtual disks to the VM?

Snapshot is not available, because it detects unsupported disks in the VM.

Screenshot the VM settings, and upload.
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Author Comment

by:beke_josue
ID: 36964732
Here are the settings
vmsettings.JPG
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LVL 124
ID: 36964783
Are you clustering in the VM, and Bus Sharing on the SCSI Controllers?
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Author Comment

by:beke_josue
ID: 36987127
Yes I am clustering in the VM, and Bus Sharing on the SCSI Controllers
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LVL 124

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 1000 total points
ID: 36987169
Snapshot NOT Supported.
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Author Closing Comment

by:beke_josue
ID: 37024113
well done. I was the reason
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