If you want to move your data from ESX to Hyper-V environment then I would suggest to take data backup. Then unpresent all volumes from ESX environment. Delete all volumes, snapshots and then delete respective vdisks in terms of Linear array. If you have Virtual Disk Group then delete them accordingly as well.
Later you can connect this MSA to Hyper-V environment and create new Vdisk or Virtual Disk Group as per your requirement. Then create Volumes and present them to host. Then restore data from backup.
Please find some useful links,
https://h20195.www2.hpe.com/v2/getpdf.aspx/4aa4-7060enw.pdf
http://itsolution-rajuprasad89.blogspot.com/2015/05/how-to-configure-hp-san-storage-msa.html
http://h20628.www2.hp.com/km-ext/kmcsdirect/emr_na-a00038738en_us-1.pdf
Hope this helps!
Regards
Subhajit
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