Currently what is going on is called Vdisk expansion so no need to again think of vdisk expand or expansion.
After vdisk expansion completed then go for Volume expansion. Please refer page no 100 of SMU guide and refer section "Modifying a volume",
https://support.hpe.com/hpesc/public/docDisplay?docId=c04220794
Once Volume expansion done then you need to check that volume presented to which Host Operating System (OS) and accordingly you need to check if Filesystem expansion supported offline or online. Accordingly you need to expand Host OS filesystem as well. Take help from OS expert regarding the same.
Hope this helps!
Regards
Subhajit
I am an HPE employee
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