HPE Storage Users Group

Can i shrink an exported thin VV? Does it being exported/unexported matter?

There is no method for shrinking a 3PAR VV. Since it's CPG based and thin provisioned by default with both zero detect and zero page reclaim why would you really need to ? The VV will only ever allocated the space for the written data. I can appreciate you may want to do this for aesthetic reasons, but as outlined above space is only actually consumed as data is written regardless of the virtual size at the host. You also have the option of setting an allocation warning on the VV once it reaches a certain size.
If however you really do need to shrink the virtual size of the VV then you'll need to do this offline with some form of file system copy between VV's.

I had the same question the other day and a call to support revealed the same answer as Cleanur gave, it can't be done.

In my case the host was running Server 2008 R2 so I was able to shrink the volume from the OS side to control the size this way, no space was lost on the array as it was a thin provisioned volume.