I have remote Ubuntu 10.10 server running on raid system. I did package upgrade yesterday night for security reasons. During the upgrade, grub installation screen appeared and asked me which partition I wanted to install grub. Options are sda,sdb,md1 and md2. I decide to install them on both sda and sdb partitions.

I wondering, was I make true decision? If machine get reboot is it can be boot up safely?

You can find fdisk output and fstab mount points below:

Fstab:

proc /proc proc defaults 0 0
none /dev/pts devpts gid=5,mode=620 0 0
/dev/md0 none swap sw 0 0
/dev/md1 /boot ext3 defaults 0 0
/dev/md2 / ext3 defaults 0 0

Fdisk:

Disk /dev/sda: 750.2 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00029bb5

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1         262     2102562   fd  Linux raid autodetect
/dev/sda2             263         295      265072+  fd  Linux raid autodetect
/dev/sda3             296       91201   730202445   fd  Linux raid autodetect

Disk /dev/md0: 2152 MB, 2152923136 bytes
2 heads, 4 sectors/track, 525616 cylinders
Units = cylinders of 8 * 512 = 4096 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: 271 MB, 271319040 bytes
2 heads, 4 sectors/track, 66240 cylinders
Units = cylinders of 8 * 512 = 4096 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: 747.7 GB, 747727224832 bytes
2 heads, 4 sectors/track, 182550592 cylinders
Units = cylinders of 8 * 512 = 4096 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/sdb: 750.2 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00088969

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1         262     2102562   fd  Linux raid autodetect
/dev/sdb2             263         295      265072+  fd  Linux raid autodetect
/dev/sdb3             296       91201   730202445   fd  Linux raid autodetect