Re: Grub2 MBR issues

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Am 02.05.2012 22:46, schrieb Jeffrey Ross:
> 
>>> My concern is if I were to loose /dev/sda I want to be able to boot via
>>> /dev/sdb.
>>
>> yes, because /dev/sda does NOt have GRUB, /dev/sdb has
>>
>>> Or am I reading the output from file wrong and its actually /dev/sda
>>> that
>>> doesn't have grub2 installed on it?
>>
>> you see "GRand Unified Bootloader" on /dev/sdb and not on /dev/sda
>> no idea howyou are interpreting your outputs
>>
>>
> 
> ok, misinformation from this post?
> http://lists.fedoraproject.org/pipermail/users/2012-February/414336.html
> 
> Now the question is who is right?  I'm starting to believe the post I
> quoted above is incorrect.

not 100% sure, but here i have a 4 disk RAID1/RAID10/RAID10 setup
originating from F14 and upgraeded to F15 and F16

i did the same as with GRUB1

grub2-install /dev/sda
grub2-install /dev/sdb
grub2-install /dev/sdc
grub2-install /dev/sdd

it boots from any disk as also another from F15 to F16
upgraded system does this way after "hotplug" any disk
from the RAID1 device and it boots surely with GRUB2
__________________________

[root@srv-rhsoft:~]$ file - < /dev/sda
/dev/stdin: x86 boot sector; GRand Unified Bootloader, stage1 version 0x3, boot drive 0x80, stage2 address 0x2000,
stage2 segment 0x200; partition 1: ID=0xfd, active, starthead 32, startsector 2048, 1024000 sectors; partition 2:
ID=0xfd, starthead 221, startsector 1026048, 30720000 sectors; partition 3: ID=0xfd, starthead 254, startsector
31746048, 3875225600 sectors, code offset 0x63

[root@srv-rhsoft:~]$ file - < /dev/sdb
/dev/stdin: x86 boot sector; GRand Unified Bootloader, stage1 version 0x3, boot drive 0x81, stage2 address 0x2000,
stage2 segment 0x200; partition 1: ID=0xfd, active, starthead 32, startsector 2048, 1024000 sectors; partition 2:
ID=0xfd, starthead 221, startsector 1026048, 30720000 sectors; partition 3: ID=0xfd, starthead 254, startsector
31746048, 3875225600 sectors, code offset 0x63

[root@srv-rhsoft:~]$ file - < /dev/sdc
/dev/stdin: x86 boot sector; GRand Unified Bootloader, stage1 version 0x3, stage2 address 0x2000, stage2 segment
0x200; partition 1: ID=0xfd, active, starthead 32, startsector 2048, 1024000 sectors; partition 2: ID=0xfd,
starthead 221, startsector 1026048, 30720000 sectors; partition 3: ID=0xfd, starthead 254, startsector 31746048,
3875225600 sectors, code offset 0x63

[root@srv-rhsoft:~]$ file - < /dev/sdd
/dev/stdin: x86 boot sector; GRand Unified Bootloader, stage1 version 0x3, boot drive 0x83, stage2 address 0x2000,
stage2 segment 0x200; partition 1: ID=0xfd, active, starthead 32, startsector 2048, 1024000 sectors; partition 2:
ID=0xfd, starthead 221, startsector 1026048, 30720000 sectors; partition 3: ID=0xfd, starthead 254, startsector
31746048, 3875225600 sectors, code offset 0x63

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