If you are aware of the consequences of vdisk expansion and you don't have option but to go for vdisk expansion only then you can refer same best practice guide and page no 40 having the table which shows RAID10 you can add 2 or 4 drives at a time.
https://h20195.www2.hpe.com/v2/GetDocument.aspx?docname=4AA4-6892ENW (page no 40)
Hope this helps!
Regards
Subhajit
I am an HPE employee
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