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understanding -delta.vmdk file

jskfan
jskfan asked
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understanding -delta.vmdk file

If I understand single -delta.vmdk file cannot exceed the size of the original -flat.vmdk file.

So, in the case  we leave a VM running on a snapshot, then  the -delta.vmdk file will keep growing till it reaches the size of -flat.vmdk file, then what will happen ?

Thank you
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Eventually it will consume all space on your volume and it will crash resulting in data loss.

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Commented:
If I understand single -delta.vmdk file cannot exceed the size of the original -flat.vmdk file.

Correct, because it's the snapshot file!

So, in the case  we leave a VM running on a snapshot, then  the -delta.vmdk file will keep growing till it reaches the size of -flat.vmdk file, then what will happen ?

FAIL!

Read my EE Arricle, it may help!

HOW TO: VMware Snapshots :- Be Patient

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Commented:
Andrew,

so if we take snapshot of small size disk, then take a snapshot of it , probably can fail quickly if we do not delete the Snapshot, because the snapshot  size can easily reach the size of the original disk...

What do you use to monitor and alert you about the size of the snapshot to avoid the crash...?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
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so if we take snapshot of small size disk, then take a snapshot of it , probably can fail quickly if we do not delete the Snapshot, because the snapshot  size can easily reach the size of the original disk...

What do you use to monitor and alert you about the size of the snapshot to avoid the crash...?

WRONG, very WRONG.

If you are running on a snapshot, you run the risk of a corrupt VM.

Search for Snapshots on EE!

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Commented:
I have read about Snapshots Article you wrote it was a very good article.
 these are kind of specific questions :

Many VMs can be  kept inadvertently running on snapshot... especially snapshots created by Backups that have not been checked.

so if you have a small VM, that runs on a snapshot, when the size of snapshot (Delta-vmdk) file reaches the size of Flat-vmdk file, then the VM crashes.
what is the Alerting tool you use , to be proactive on that ?

Thanks
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
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Commented:
scripts
vCenter Alerts
Snapshot Watcher commercial
Daily VMware Admin

it’s part of our Operators 1hour 100 daily checks at shift change!
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
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Commented:
glad you liked the article

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Commented:
Thank you Guys

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