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Old 05-02-2012, 08:20 PM
"Jeffrey Ross"
 
Default Grub2 MBR issues

I have a F16 system (which had been upgraded from F15) that is running
RAID-1 for all volumes. I have notice that GRUB2 is only on /dev/sda but
not on /dev/sdb

[root@wisdom boot]# file - < /dev/sda
/dev/stdin: x86 boot sector; partition 1: ID=0xfd, active, starthead 32,
startsector 2048, 785137 sectors; partition 2: ID=0xfd, starthead 0,
startsector 787185, 15631245 sectors; partition 3: ID=0xfd, starthead 0,
startsector 16418430, 8000370 sectors; partition 4: ID=0x5, starthead 254,
startsector 24418800, 1929101265 sectors, code offset 0x63

[root@wisdom boot]# file - < /dev/sdb
/dev/stdin: x86 boot sector; GRand Unified Bootloader, stage1 version 0x3,
boot drive 0x80, 1st sector stage2 0x842a9; partition 1: ID=0xfd, active,
starthead 32, startsector 2048, 785137 sectors; partition 2: ID=0xfd,
starthead 0, startsector 787185, 15631245 sectors; partition 3: ID=0xfd,
starthead 0, startsector 16418430, 8000370 sectors; partition 4: ID=0x5,
starthead 254, startsector 24418800, 1929101265 sectors, code offset 0x63

My concern is if I were to loose /dev/sda I want to be able to boot via
/dev/sdb.

I have tried running:
[root@wisdom boot]# grub2-install /dev/sdb --no-floppy
Installation finished. No error reported.

but there is no change in what file reports.

Both disks are identical (same model) and the partition table was
duplicated with "sfdisk -d /dev/sda | sfdisk /dev/sdb"

Or am I reading the output from file wrong and its actually /dev/sda that
doesn't have grub2 installed on it?

Thanks, Jeff




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