我正在远程服务器上运行 Ubuntu 14.04。这是唯一安装的操作系统。在重新启动机器之前我需要非常小心，因为 KVM 访问服务器非常棘手。
在 GRUB 更新期间，系统会询问我在哪里安装 GRUB。磁盘上有 Raid1。我不知道我应该去哪里。
这是挂载表：
# mount
/dev/md2 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/cgroup type tmpfs (rw)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755)
none on /sys/fs/pstore type pstore (rw)
/dev/md1 on /boot type ext3 (rw)
/dev/md126 on /home type ext4 (rw,noexec,nosuid,nodev)
/dev/md127 on /backup type ext4 (rw,noexec,nosuid,nodev)
systemd on /sys/fs/cgroup/systemd type cgroup (rw,noexec,nosuid,nodev,none,name=systemd)
并且，这是 fdisk 输出：
# fdisk -l
Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000b5404
Device Boot Start End Blocks Id System
/dev/sdb1 2048 33556480 16777216+ fd Linux raid autodetect
/dev/sdb2 33558528 34607104 524288+ fd Linux raid autodetect
/dev/sdb3 34607105 1094607934 530000415 fd Linux raid autodetect
/dev/sdb4 1094607935 3907029167 1406210616+ 5 Extended
/dev/sdb5 1094607998 2154608764 530000383+ fd Linux raid autodetect
/dev/sdb6 2154608828 3907029167 876210170 fd Linux raid autodetect
Disk /dev/sda: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00044ee7
Device Boot Start End Blocks Id System
/dev/sda1 2048 33556480 16777216+ fd Linux raid autodetect
/dev/sda2 33558528 34607104 524288+ fd Linux raid autodetect
/dev/sda3 34607105 1094607934 530000415 fd Linux raid autodetect
/dev/sda4 1094607935 3907029167 1406210616+ 5 Extended
/dev/sda5 1094607998 2154608764 530000383+ fd Linux raid autodetect
/dev/sda6 2154608828 3907029167 876210170 fd Linux raid autodetect
Disk /dev/md127: 897.1 GB, 897104996352 bytes
2 heads, 4 sectors/track, 219019774 cylinders, total 1752158196 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/md127 doesn't contain a valid partition table
Disk /dev/md0: 17.2 GB, 17171349504 bytes
2 heads, 4 sectors/track, 4192224 cylinders, total 33537792 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/md0 doesn't contain a valid partition table
Disk /dev/md1: 536 MB, 536543232 bytes
2 heads, 4 sectors/track, 130992 cylinders, total 1047936 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/md1 doesn't contain a valid partition table
Disk /dev/md2: 542.6 GB, 542586207232 bytes
2 heads, 4 sectors/track, 132467335 cylinders, total 1059738686 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/md2 doesn't contain a valid partition table
Disk /dev/md126: 542.6 GB, 542586174976 bytes
2 heads, 4 sectors/track, 132467327 cylinders, total 1059738623 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/md126 doesn't contain a valid partition table
答案1
在 VPS 中，您通常不会安装 GRUB。 GRUB 加载内核（除其他外）。如果您有 OpenVZ 或类似环境，则无需加载内核。内核在容器之间共享。您也不会更新内核——事实上，它会受到写保护，免受您的更新影响。
在基于 KVM 的 VPS 中这是另一回事。在这些情况下，您确实会加载内核。您可以通过检查合同或查看 的输出来了解您拥有哪种类型的 VPS uname -a。 OpenVZ 内核通常会向内核版本添加特定字符串，例如 2.6.26-1-openvz-amd64。
也可以看看https://stackoverflow.com/questions/1603351/should-i-choose-kvm-or-openvz-for-my-vps比较两种方法（还有更多，但不太常见）。
PS：这个答案与 VPS 上 GRUB 位置的原始问题相关。相关数据现在在这个答案的评论中。