Two systems -- supposed to be the same, but booting with grub differently. What'd I miss?

[my59stang]

Hi,

I've got two machines. Both are supposed to be configured the same: Linux, with 
grub2 booting, with everything on a RAID-1 array.

I read up on list posts, docs, etc and got both systems booting up OK, and 
everything seems to run fine.

BUT ... "System 2" takes a very long time to boot -- it stalls at right after 
the Grub menu for up to 2 minutes, then continues to boot normally.  OTOH, 
"System 1" continue boot immediately.

I used "bootinfoscript" to look at the grub info for both systems.

2 things popped out at me:

        -- system 1's "/boot" partition is on a RAID array config'd as v1.0 
metadat; system 2's is v1.2
        -- system 1's got Grub2 installed in BOTH MBR & boot sector of both 
RAID disks; system 2's got it only installed in MBR.

So a couple of questions:

(a) how SHOULD grub2 be installed in this config?  MBR &/or boot sector?
(b) whatever way it should be installed, how do I change the 'wrong on' to be 
correct?

What did I miss or forget?

JerryG

p.s.  Here's the bootinfo script output that I'm talking about for each system.

(1) System1
------------------------
cat /proc/mdstat
        Personalities : [raid1]
        md1 : active raid1 sda2[0] sbd2[1]
              487205888 blocks super 1.2 [2/2] [UU]
              bitmap: 1/4 pages [4KB], 65536KB chunk

        md0 : active raid1 sbd1[1] sda1[0]
              1048512 blocks super 1.0 [2/2] [UU]
              bitmap: 0/1 pages [0KB], 65536KB chunk

        unused devices: <none>

mount | grep boot
        /dev/md0 on /boot type ext4 (rw,noatime,data=ordered)


cat /root/RESULTS.txt 
                Boot Info Script 0.75      [14 November 2016]


============================= Boot Info Summary: ===============================

 => Grub2 (v1.99-2.00) is installed in the MBR of /dev/sda and looks at sector 
    1 of the same hard drive for core.img, but core.img can not be found at 
    this location.
 => Grub2 (v1.99-2.00) is installed in the MBR of /dev/sdb and looks at sector 
    1 of the same hard drive for core.img, but core.img can not be found at 
    this location.

sda1: __________________________________________________________________________

    File system:       linux_raid_member
    Boot sector type:  Grub2 (v1.99-2.00)
    Boot sector info:  Grub2 (v1.99-2.00) is installed in the boot sector of 
                       sda1 and looks at sector 290367 of the same hard drive 
                       for core.img, but core.img can not be found at this 
                       location.

sda2: __________________________________________________________________________

    File system:       linux_raid_member
    Boot sector type:  -
    Boot sector info: 

sdb1: __________________________________________________________________________

    File system:       linux_raid_member
    Boot sector type:  Grub2 (v1.99-2.00)
    Boot sector info:  Grub2 (v1.99-2.00) is installed in the boot sector of 
                       sdb1 and looks at sector 290367 of the same hard drive 
                       for core.img, but core.img can not be found at this 
                       location.

sdb2: __________________________________________________________________________

    File system:       linux_raid_member
    Boot sector type:  -
    Boot sector info: 

------------------------


(2) System 2
------------------------
cat /proc/mdstat
        Personalities : [raid1]
        md0 : active raid1 sda1[0] sdb1[1]
              1047552 blocks super 1.2 [2/2] [UU]
              bitmap: 0/1 pages [0KB], 65536KB chunk

        md1 : active raid1 sda2[0] sdb2[1]
              975581888 blocks super 1.2 [2/2] [UU]
              bitmap: 1/8 pages [4KB], 65536KB chunk

        unused devices: <none>

mount | grep boot
        /dev/md0 on /boot type ext4 (rw,noatime,data=ordered)

cat /root/RESULTS.txt 
                Boot Info Script 0.75      [14 November 2016]


============================= Boot Info Summary: ===============================

 => Grub2 (v1.99-2.00) is installed in the MBR of /dev/sda and looks at sector 
    1 of the same hard drive for core.img, but core.img can not be found at 
    this location.
 => Grub2 (v1.99-2.00) is installed in the MBR of /dev/sdb and looks at sector 
    1 of the same hard drive for core.img, but core.img can not be found at 
    this location.

sda1: __________________________________________________________________________

    File system:       linux_raid_member
    Boot sector type:  -
    Boot sector info: 

sda2: __________________________________________________________________________

    File system:       linux_raid_member
    Boot sector type:  -
    Boot sector info: 

sdb1: __________________________________________________________________________

    File system:       linux_raid_member
    Boot sector type:  -
    Boot sector info: 

sdb2: __________________________________________________________________________

    File system:       linux_raid_member
    Boot sector type:  -
    Boot sector info: 

------------------------