The GRUB boot loader was prevIoUsly installed to a disk that is no longer present,or whose unique identifier has changed for some reason. It is important to make sure that the
installed GRUB core image stays in sync with GRUB modules and grub.cfg. Please check
again to make sure that GRUB is written to the appropriate boot devices.

If you're unsure which drive is designated as boot drive by your BIOS,it is often 
a good idea to install GRUB to all of them.

Note: it is possible to install GRUB to partition boot records as well,and some
appropriate partitions are offered here. However,this forces GRUB to use the blocklist
mechanism,which makes it less reliable,and therefore is not recommended.

GRUB install devices:
[ ] /dev/sda (3000592 MB; ST3000DM001-9YN166)
[ ] /dev/sdb (3000592 MB; ST3000DM001-9YN166)
[ ] /dev/md1 (536 MB; rescue:1)
[ ] /dev/md2 (1099510 MB; rescue:2)

我担心选择错误的选项会导致我的盒子无法启动.我没有物理访问权限,因为它是云中的一个盒子.请指教！

编辑：

这是我的/ etc / fstab：

proc /proc proc defaults 0 0
/dev/md/0 none swap sw 0 0
/dev/md/1 /boot ext3 defaults 0 0
/dev/md/2 / ext4 defaults 0 0
/dev/md/3 /home ext4 defaults 0 0

这是我的df -h：

Filesystem      Size  Used Avail Use% Mounted on
/dev/md2       1016G  127G  838G  14% /
udev             16G  4.0K   16G   1% /dev
tmpfs           6.3G  768K  6.3G   1% /run
none            5.0M     0  5.0M   0% /run/lock
none             16G     0   16G   0% /run/shm
/dev/md1        496M   44M  427M  10% /boot
/dev/md3        1.7T  368G  1.3T  23% /home