Hurting you VM performance using SCP (or fast SCP)

I never knew this:

Using SCP/CP to place the VMDK on the VMFS volume can cause poor disk performance for the VM, vmfkstools properly allocates the space to prevent this.


vmkfstools allocates all space at once and then copies the data, a “normal” copy (cp, scp, …) allocates the space while copying.
This behavior can lead to VMDK fragmentation and therefore to poor disk performance.



From here


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