Virtual Disks and replication between sites

Greetings VMware Experts,

I have a THICK vmdk file of 1TB.
The actual/real data is 150GB

Copying this vmdk to a DR Site

Q1) what will be the size reservation on the storage 150GB or 1TB?

Q2) Using a replication software such as Veeam, will replicate the real Data of 150GB or will replicate the whole vmdk file which is 1TB?

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Q1) 1TB as it's a replica (mirror) of the actual VM.

Q2) Depends on the blocks which have been changed in the 1TB virtual disk.

If you have a tick VMDK of 1TB, and are only using 150GB, I would recommend you shrink it to the size required.

It's always easy to expand a disk, to the size required.

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mamelasAuthor Commented:
Hi there Andrew,

For an Exchange DB would be wise to keep a smaller Thick vmdk

Or would be the same of having a thin vmdk?
mamelasAuthor Commented:
...and one last question on the subject,

Since it is a mirror and although that the vmdk uses only 150GB if I extract the datastore the file size will be 1TB??
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Thin disks are not supported the last time, the Exchange debated Thick versus Thin.

Correct, if it's 1TB VMDK, it will be less, e.g. if you export it, but it depends on the real use of the virtual disk.

You can run scripts, from day to day, to see what the rate of change of blocks in the VM are, to size a WAN link.
mamelasAuthor Commented:
Thanks for your help!
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