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Well a new problem . After one hard failure in raid .. when I try to grub-install /dev/sda

This error appear

/usr/sbin/grub-probe: error: no such disk.
Auto-detection of a filesystem of /dev/md1 failed.
Please report this together with the output of “/usr/sbin/grub-probe –device-map=/boot/grub/device.map –target=fs -v /boot/grub” to <bug-grub@gnu.org>

So the fix is .. after you mount the partition like in this link http://matrafox.info/reinstall-grub-after-raid-crash.html

1. mv /boot/grub/device.map /boot/grub/device.map.old
2. grub-mkdevicemap
3. update-grub2 && grub-install /dev/sda && grub-install /dev/sdb