Size VMDK after snapshot

Hello

I think I have misunderstood a feature of instant releated.

We did a snapshot to reduce the total space of VM and remove all previous (so VM is on the total hard disk space + a few log files).

When you restart the computer, virtual, the file:

Vm02 - 000001.vmdk

develops within a few minutes of 1 MB to 800 MB.

Structure of hard disk cannot change so much in a short time (Windows Update just do before stop).

Then why this file becomes so big so fast?

Thank you

Vincent

Snapshots set the file hard base (your virtual drive) in a read-only mode, and all changes are kept in a new file, your "Vm02 - 000001.vmdk". If this file retains the delta between the read-only base file and the actual state of the guest. That is why it is more.

When you delete the snapshot all the changes of this delta file are rewritten on your hard base to keep the changes. If you want to go back to the point where you took the photo, the delta file is deleted, the virtual guest is indented to the State stored in the base file and a new delta file is generated to keep the new changes.

The snapshot is not used to reduce the basic disk. BTW the shrinkage is only possible when you have created the basic format disc thin provisioned.

With vSphere you must have sVmotion to shrink a thin disc put into service from a data to another store or by cloning the prompt and choose the clone must use a fine service as target disc. You must run "sdelete" of the suite of tools sysinternal before doing so, so that the guest OS releases really already used data blocks.

AWo

VCP 3 & 4

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Tags: VMware

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