Thanks. it is easier by using https://<management IP address>/v2/index.html
Disks from MSA2 are now available (after dequrantine). I deleted the second Vdisk which containt 2 volumes (hyperv and quorum).
Now I am adding disks 2 from my MSA2 to the first Vdisks which is in Raid 5, it is on running. Hope I will not lost data in my 1st Vdisk.
After that, I would extend my DATA-HYP volume, I guest I must do an "expand Vdisk" before ?