If you have Naviseccli installed, you can use chrg -defrag to start an immediate defrag.  Looks like the command is still in place in the Command Reference for Block document.

Let us know if that helps!

Karl

I cannot find any official document telling it for sure, are you able to find it?

I dont see defrag available in CLI for rel 33

https://support.emc.com/docu47580_VNX-Command-Line-Interface-Reference-for-Block-5.33.pdf?language=en_US

I remember hearing that its not available in MCx based arrays

Gearoid