I managed to make it work for anyone els whom might face the same issue here what i did :
activation of sata multiplier in OMV 4xx + banana pi + JMB 321
in putty
first use the command ===> nano /boot/boot.cmd
inside ===> find the line that stars with [ setenv bootargs.... ] and at the end before " we add : ahci_sunxi.enable_pmp=1
then control +x and then y and enter
then on the main page we put in the command ===> mkimage -C none -A arm -T script -d /boot/boot.cmd /boot/boot.scr
and enter
then reboot
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Use the command 'blkid' to see the hard drives show up