Best way to migrate Data Disks between VMs without downtime

I would like to migrate two Hard Disks (main data disks)  from one VM to another without down time.
What is the best way to do this.

The existing server has  Windows 2012 R2  which has 1 OS Disk + 2 Hard Disks.
The Target (new) server has Windows 2012 R2 which has 1 OS Disk  only; and would like to migrate the  2 Hard DIsks from the existing server.
cgeorgeisaacAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
There are no features within VMware vSphere, which will allow you to do this with zero downtime.

You will need to use a Replication application  within the OS
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cgeorgeisaacAuthor Commented:
Noted.   What are the options to do   with downtime.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Simplest option you've got Robcopy, you can keep both VMs up, and create a Sync/Mirror copy between the two servers, until the disk has been copied.

You could detach, and remove the disks from one VM, and add to the new VM, in realtime, HotPlug, VMs both can be powered up, you just need to make sure no-one is accessing them.

Are there shares on the source disk ?
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cgeorgeisaacAuthor Commented:
Yes there are shares on the source disks.
Instead of  Robcopy, will  creating a Clone in a different datastore  be another alternative?  However, not sure which will be faster RobCopy or Clone.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
but you want to MIGRATE, so why not detach and re-attach ?

no need to copy or clone ?

and quick!
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cgeorgeisaacAuthor Commented:
Sounds good.  Will do.  (On another note:  Which is faster - RoboCopy or  Clone?) Thanks.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Clone it's working at block, not file and folder level
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